Carbon steel, powder coat finish
✔ NEW! Optional non-slip finish
✔ Standard or custom colors
✔ Choice of three handrail options
✔ Choice of 56 or 68 degree angle
More info
Carbon steel, galvanized finish
✔ Ideal for outdoor use
✔ Hot dip galvanized finish
✔ Choice of three handrail options
✔ Choice of 56 or 68 degree angle
More info
Stainless steel, natural finish
✔ Easy to clean
✔ Grade 304 stainless steel
✔ Choice of three handrail options
✔ Choice of 56 or 68 degree angle
More info
Aluminum, natural finish
✔ Lightweight
✔ Resists corrosion
✔ Choice of two handrail options
✔ 68 degree angle only
More info
Maximum safety in minimum space
Compare the space-saving and ergonomic design of alternating tread stairs to standard stairs and ship stairs
Standard stair
Each foot normally uses only about half of each tread, stepping out and over the unused section.
Learn more
Ship stair
The unused half tread becomes an obstacle by reducing the usable depth of the tread below.
Learn more
Alternating tread stair
The unused half tread is removed to provide more tread depth for improved safety and comfort.
How to use
 |
The alternating tread stair design |
|
 |
Alternating tread stairs require a smaller overall footprint than standard stairs because of their steeper slope of either 56 or 68 degrees |
|
 |
Alternating tread stairs are designed to be used as a standard stair with users facing the direction of travel when climbing up and down |
|
 |
The code-compliant handrails on alternating tread stairs meet OSHA requirements for fall protection and improve ease of use |
|
 |
Alternating tread stairs have a built-in, cushioned, central stringer designed to protect users and reduce the risk of trips and falls |
|
How do alternating tread stairs compare to standard stairs, ship stairs, and fixed ladders?
How to use an alternating tread stair
Customer testimonials
Ecologix Systems
" Lapeyre Stair has been a great resource for our business. Their team has helped us design a safer, more cost-effective access and walkway system for our products. Their design expertise, response times, and expedited fabrication lead times have helped us meet demanding customer schedules while freeing up resources to focus on our core business of manufacturing world class water treatment systems. "
Ecologix Systems
Silent Aire
" We decided to switch to the alternating tread stair from caged ladders to access our equipment because it provides a safer, easier, and more efficient means of access to the equipment for our clients. The team at Lapeyre Stair has been great to work with. They are very responsive and their quick turnarounds on drawings and fabrication schedules have met the demands of our fast-paced projects. "
Silent Aire
" We have used alternating tread stairs from Lapeyre Stair for years and are finding new places to install them all the time. They are safer and easier to climb than a ladder and, when you run out of room for a long set of stairs, they are a great alternative. Customer Service has always been great; they are very patient and helpful; and my orders are correct when they arrive and include all the parts. Alternating tread stairs are easy to install and assemble. I just measure the height of the platform and decide what degree I want. Customer Service quickly responds with a print for approval, we issue a PO, and the order is produced. "
Vincent Incardona, Georgia Pacific
Additional products for alternating tread stairs
Options for improved safety, maximum stability, and additional installation options designed exclusively for use with alternating tread stairs.
Safety gates
Precision fit to provide additional security at the top of alternating tread stairs.
Handrail Extension
Maximizes stability and extends safety on alternating tread stairs for roof hatches and pits.
Back pans
A solid pan that bolts in place under the stair to provide protection from dropped objects.
Micro platforms
Bolts to the top tread of alternating tread stairs to provide an expanded landing surface.
Extended mounting plate
Welded to the existing mounting plate to adjust the location of the mounting holes.
Carbon steel, powder coat finish
- NEW! Optional non-slip finish
- Standard or custom colors
- Choice of three handrail options
- Choice of 56 or 68 degree angle
Carbon steel, galvanized finish
- Ideal for outdoor use
- Hot dip galvanized finish
- Choice of three handrail options
- Choice of 56 or 68 degree angle
Stainless steel, natural finish
- Easy to clean
- Grade 304 stainless steel
- Choice of three handrail options
- Choice of 56 or 68 degree angle
Aluminum, natural finish
- Lightweight
- Resists corrosion
- Choice of two handrail options
- 68 degree angle only
|
Carbon steel, powder coat finish
|
|
Carbon steel, galvanized finish
|
|
Stainless steel, natural finish
|
|
Aluminum, natural finish
|
Maximum safety in minimum space
Compare the space-saving and ergonomic design of alternating tread stairs to standard stairs and ship stairs
Standard stair
Each foot normally uses only about half of each tread, stepping out and over the unused section.
Learn more
Ship stair
The unused half tread becomes an obstacle by reducing the usable depth of the tread below.
Learn more
Alternating tread stair
The unused half tread is removed to provide more tread depth for improved safety and comfort.
How to use
The alternating tread stair design |
|
|
Alternating tread stairs require a smaller overall footprint than standard stairs because of their steeper slope of either 56 or 68 degrees |
|
Alternating tread stairs are designed to be used as a standard stair with users facing the direction of travel when climbing up and down |
|
The code-compliant handrails on alternating tread stairs meet OSHA requirements for fall protection and improve ease of use |
|
Alternating tread stairs have a built-in, cushioned, central stringer designed to protect users and reduce the risk of trips and falls |
How do alternating tread stairs compare to standard stairs, ship stairs, and fixed ladders?
How to use an alternating tread stair
Customer testimonials
Ecologix Systems
" Lapeyre Stair has been a great resource for our business. Their team has helped us design a safer, more cost-effective access and walkway system for our products. Their design expertise, response times, and expedited fabrication lead times have helped us meet demanding customer schedules while freeing up resources to focus on our core business of manufacturing world class water treatment systems. "
Ecologix Systems
Silent Aire
" We decided to switch to the alternating tread stair from caged ladders to access our equipment because it provides a safer, easier, and more efficient means of access to the equipment for our clients. The team at Lapeyre Stair has been great to work with. They are very responsive and their quick turnarounds on drawings and fabrication schedules have met the demands of our fast-paced projects. "
Silent Aire
" We have used alternating tread stairs from Lapeyre Stair for years and are finding new places to install them all the time. They are safer and easier to climb than a ladder and, when you run out of room for a long set of stairs, they are a great alternative. Customer Service has always been great; they are very patient and helpful; and my orders are correct when they arrive and include all the parts. Alternating tread stairs are easy to install and assemble. I just measure the height of the platform and decide what degree I want. Customer Service quickly responds with a print for approval, we issue a PO, and the order is produced. "
Vincent Incardona, Georgia Pacific
Additional products for alternating tread stairs
Options for improved safety, maximum stability, and additional installation options designed exclusively for use with alternating tread stairs.
Safety gates
Precision fit to provide additional security at the top of alternating tread stairs.
Sway bracing
Maximizes stability and prevents swaying on alternating tread stairs and crossover systems.
Back pans
A solid pan that bolts in place under the stair to provide protection from dropped objects.
Micro platforms
Bolts to the top tread of alternating tread stairs to provide an expanded landing surface.
Extended mounting plate
Welded to the existing mounting plate to adjust the location of the mounting holes.
Alternating tread stairs are the safer and more ergonomic solution for applications with space restrictions
Types of alternating tread stairs
About carbon steel alternating tread stairs with a powder coat finish
✔ Our most popular and most used type of alternating tread stair
✔ Ideal for most indoor applications
Design specifications and options
✔ Custom built to exact height
✔ Three-stringer design with alternating treads welded to the stringers
✔ Ships with rubber bumper attached to the center stringer
✔ Overall width of 23"; inside handrail width of 20"
✔ Minimum 8.5" tread depth
✔ Handrails ship unattached and bolt into place during installation
56° stair angle
✔ Riser height of 6.4" to 7.7"
✔ 8.5" minimum tread depth
68° stair angle
✔ Riser height of 7.5" to 9"
✔ 8.5" minimum tread depth
Standard handrails
✔ 36" minimum height
✔ 240" maximum height
✔ Adds 42" to stair height
Optional handrails
✔ 42" minimum height
✔ 240" maximum height
✔ Adds 5.75" to stair height
Flush handrails
✔ 42" minimum height
✔ 240" maximum height
✔ Flush with top stair riser
Safety yellow
Iron gray
Gray primer
Carbon steel alternating tread stairs with powder coat finish are also available in custom RAL colors.
Measuring guidelines, sample prints, standard dimensions, connection details, and more.
Pricing and specifications for carbon steel alternating tread stairs with a powder coat finish
Alternating tread stairs are custom built to your exact height specifications. See below for pricing in six-inch increments; get a quote for custom stair heights.
| STAIR HEIGHT |
OVERALL/HANDRAIL HEIGHT | STAIR RUN | WEIGHT | PRICE | ||||
| STANDARD | OPTIONAL | 56° | 68° | 56° | 68° | STANDARD COLORS | CUSTOM COLORS | |
| 36" | 78" | 41.75" | 28.93" | N/A | 83.408# | N/A | $1,047.47 | $1,337.35 |
| 42" | 84" | 47.75" | 33.11" | 23.08" | 91.976# | 76.944# | $1,163.99 | $1,462.75 |
| 48" | 90" | 53.75" | 37.25" | 25.66" | 100.544# | 84.936# | $1,280.51 | $1,588.15 |
| 54" | 96" | 59.75" | 41.37" | 28.2" | 109.112# | 92.928# | $1,397.03 | $1,713.55 |
| 60" | 102" | 65.75" | 44.91" | 30.28" | 117.68# | 100.92# | $1,513.55 | $1,838.95 |
| 66" | 108" | 71.75" | 49.07" | 32.83" | 126.248# | 108.912# | $1,630.07 | $1,964.35 |
| 72" | 114" | 77.75" | 53.21" | 35.36" | 134.816# | 116.904# | $1,746.59 | $2,089.75 |
| 78" | 120" | 83.75" | 57.33" | 37.86" | 143.384# | 124.896# | $1,863.11 | $2,215.15 |
| 84" | 126" | 89.75" | 61.44" | 40.04" | 151.952# | 132.888# | $1,979.63 | $2,340.55 |
| 90" | 132" | 95.75" | 65.15" | 42.56" | 160.52# | 140.88# | $2,096.15 | $2,465.95 |
| 96" | 138" | 101.75" | 69.27" | 45.05" | 169.088# | 148.872# | $2,212.67 | $2,591.35 |
| 102" | 144" | 107.75" | 73.39" | 47.28" | 177.656# | 156.864# | $2,329.19 | $2,716.75 |
| 108" | 150" | 113.75" | 77.49" | 49.78" | 186.224# | 164.856# | $2,445.71 | $2,842.15 |
| 114" | 156" | 119.75" | 81.59" | 52.27" | 194.792# | 172.848# | $2,562.23 | $2,967.55 |
| 120" | 162" | 125.75" | 85.38" | 54.75" | 234.56# | 180.84# | $2,678.75 | $3,092.95 |
| 126" | 168" | 131.75" | 89.49" | 57.01" | 244.688# | 188.832# | $2,795.27 | $3,218.35 |
| 132" | 174" | 137.75" | 93.59" | 59.5" | 254.816# | 196.824# | $2,911.79 | $3,343.75 |
| 138" | 180" | 143.75" | 97.68" | 61.98" | 264.944# | 204.816# | $3,028.31 | $3,469.15 |
| 144" | 186" | 149.75" | 101.77" | 64.45" | 275.072# | 245.272# | $3,144.83 | $3,594.55 |
| 150" | 192" | 155.75" | 105.62" | 66.74" | 285.2# | 254.2# | $3,261.35 | $3,719.95 |
| 156" | 198" | 161.75" | 109.71" | 69.21" | 295.328# | 263.128# | $3,377.87 | $3,845.35 |
| 162" | 204" | 167.75" | 113.8" | 71.68" | 305.456# | 272.056# | $3,494.39 | $3,970.75 |
| 168" | 210" | 173.75" | 117.89" | 73.98" | 315.584# | 280.984# | $3,610.91 | $4,096.15 |
| 174" | 216" | 179.75" | 121.97" | 76.45" | 325.712# | 289.912# | $3,727.43 | $4,221.55 |
| 180" | 222" | 185.75" | 125.85" | 78.92" | 335.84# | 298.84# | $3,843.95 | $4,346.95 |
| 186" | 228" | 191.75" | 129.94" | 81.38" | 345.968# | 307.768# | $3,960.47 | $4,472.35 |
| 192" | 234" | 197.75" | 134.02" | 83.7" | 356.096# | 316.696# | $4,076.99 | $4,597.75 |
| 198" | 240" | 203.75" | 138.11" | 86.16" | 366.224# | 325.624# | $4,193.51 | $4,723.15 |
| 204" | 246" | 209.75" | 142.19" | 88.62" | 376.352# | 334.552# | $4,310.03 | $4,848.55 |
| 210" | 252" | 215.75" | 146.09" | 91.08" | 386.48# | 343.48# | $4,426.55 | $4,973.95 |
| 216" | 258" | 221.75" | 150.17" | 93.41" | 396.608# | 352.408# | $4,543.07 | $5,099.35 |
| 222" | 264" | 227.75" | 154.25" | 95.87" | 406.736# | 361.336# | $4,659.59 | $5,224.75 |
| 228" | 270" | 233.75" | 158.33" | 98.33" | 416.864# | 370.264# | $4,776.11 | $5,350.15 |
| 234" | 276" | 239.75" | 162.4" | 100.78" | 426.992# | 379.192# | $4,892.63 | $5,475.55 |
| 240" | 282" | 245.75" | 166.32" | 103.12" | 437.12# | 388.12# | $5,009.15 | $5,600.95 |
All pricing information is presented in good faith and believed to be correct at the time of publishing. We reserve the right to change prices at any time without notice. Prices do not include installation hardware or shipping costs.
About carbon steel alternating tread stairs with a galvanized finish
✔ Hot-dipped galvanized finish
✔ Ideal for outdoor applications
Design specifications and options
✔ Custom built to exact height
✔ Three-stringer design with alternating treads welded to the stringers
✔ Ships with rubber bumper attached to the center stringer
✔ Overall width of 23"; inside handrail width of 20"
✔ Minimum 8.5" tread depth
✔ Handrails ship unattached and bolt into place during installation
56° stair angle
✔ Riser height of 6.4" to 7.7"
✔ 8.5" minimum tread depth
68° stair angle
✔ Riser height of 7.5" to 9"
✔ 8.5" minimum tread depth
Standard handrails
✔ 36" minimum height
✔ 240" maximum height
✔ Adds 42" to stair height
Optional handrails
✔ 42" minimum height
✔ 240" maximum height
✔ Adds 5.75" to stair height
Flush handrails
✔ 42" minimum height
✔ 240" maximum height
✔ Flush with top stair riser
Measuring guidelines, sample prints, standard dimensions, connection details, and more. Product resources
Pricing and specifications for carbon steel alternating tread stairs with a galvanized finish
Alternating tread stairs are custom built to your exact height specifications. See below for pricing in six-inch increments; get a quote for custom stair heights.
| STAIR HEIGHT |
OVERALL/HANDRAIL HEIGHT | STAIR RUN | WEIGHT | PRICE |
|||
| STANDARD | OPTIONAL | 56° | 68° | 56° | 68° | ||
| 36" | 78" | 41.75" | 28.93" | N/A | 83.408# | N/A | $1,226.42 |
| 42" | 84" | 47.75" | 33.11" | 23.08" | 91.976# | 76.944# | $1,362.26 |
| 48" | 90" | 53.75" | 37.25" | 25.66" | 100.544# | 84.936# | $1,498.10 |
| 54" | 96" | 59.75" | 41.37" | 28.2" | 109.112# | 92.928# | $1,633.94 |
| 60" | 102" | 65.75" | 44.91" | 30.28" | 117.68# | 100.92# | $1,769.78 |
| 66" | 108" | 71.75" | 49.07" | 32.83" | 126.248# | 108.912# | $1,905.62 |
| 72" | 114" | 77.75" | 53.21" | 35.36" | 134.816# | 116.904# | $2,041.46 |
| 78" | 120" | 83.75" | 57.33" | 37.86" | 143.384# | 124.896# | $2,177.30 |
| 84" | 126" | 89.75" | 61.44" | 40.04" | 151.952# | 132.888# | $2,313.14 |
| 90" | 132" | 95.75" | 65.15" | 42.56" | 160.52# | 140.88# | $2,448.98 |
| 96" | 138" | 101.75" | 69.27" | 45.05" | 169.088# | 148.872# | $2,584.82 |
| 102" | 144" | 107.75" | 73.39" | 47.28" | 177.656# | 156.864# | $2,720.66 |
| 108" | 150" | 113.75" | 77.49" | 49.78" | 186.224# | 164.856# | $2,856.50 |
| 114" | 156" | 119.75" | 81.59" | 52.27" | 194.792# | 172.848# | $2,992.34 |
| 120" | 162" | 125.75" | 85.38" | 54.75" | 234.56# | 180.84# | $3,128.18 |
| 126" | 168" | 131.75" | 89.49" | 57.01" | 244.688# | 188.832# | $3,264.02 |
| 132" | 174" | 137.75" | 93.59" | 59.5" | 254.816# | 196.824# | $3,399.86 |
| 138" | 180" | 143.75" | 97.68" | 61.98" | 264.944# | 204.816# | $3,535.70 |
| 144" | 186" | 149.75" | 101.77" | 64.45" | 275.072# | 245.272# | $3,671.54 |
| 150" | 192" | 155.75" | 105.62" | 66.74" | 285.2# | 254.2# | $3,807.38 |
| 156" | 198" | 161.75" | 109.71" | 69.21" | 295.328# | 263.128# | $3,943.22 |
| 162" | 204" | 167.75" | 113.8" | 71.68" | 305.456# | 272.056# | $4,079.06 |
| 168" | 210" | 173.75" | 117.89" | 73.98" | 315.584# | 280.984# | $4,214.90 |
| 174" | 216" | 179.75" | 121.97" | 76.45" | 325.712# | 289.912# | $4,350.74 |
| 180" | 222" | 185.75" | 125.85" | 78.92" | 335.84# | 298.84# | $4,486.58 |
| 186" | 228" | 191.75" | 129.94" | 81.38" | 345.968# | 307.768# | $4,622.42 |
| 192" | 234" | 197.75" | 134.02" | 83.7" | 356.096# | 316.696# | $4,758.26 |
| 198" | 240" | 203.75" | 138.11" | 86.16" | 366.224# | 325.624# | $4,894.10 |
| 204" | 246" | 209.75" | 142.19" | 88.62" | 376.352# | 334.552# | $5,029.94 |
| 210" | 252" | 215.75" | 146.09" | 91.08" | 386.48# | 343.48# | $5,165.78 |
| 216" | 258" | 221.75" | 150.17" | 93.41" | 396.608# | 352.408# | $5,301.62 |
| 222" | 264" | 227.75" | 154.25" | 95.87" | 406.736# | 361.336# | $5,437.46 |
| 228" | 270" | 233.75" | 158.33" | 98.33" | 416.864# | 370.264# | $5,573.30 |
| 234" | 276" | 239.75" | 162.4" | 100.78" | 426.992# | 379.192# | $5,709.14 |
| 240" | 282" | 245.75" | 166.32" | 103.12" | 437.12# | 388.12# | $5,844.98 |
All pricing information is presented in good faith and believed to be correct at the time of publishing. We reserve the right to change prices at any time without notice. Prices do not include installation hardware or shipping costs.
About stainless steel alternating tread stairs
✔ Grade 304 stainless steel
✔ Easy-to-clean finish
Design specifications and options
✔ Custom built to exact height
✔ Three-stringer design with alternating treads welded to the stringers
✔ Ships with rubber bumper attached to the center stringer
✔ Overall width of 23"; inside handrail width of 20"
✔ Minimum 8.5" tread depth
✔ Handrails ship unattached and bolt into place during installation
56° stair angle
✔ Riser height of 6.4" to 7.7"
✔ 8.5" minimum tread depth
68° stair angle
✔ Riser height of 7.5" to 9"
✔ 8.5" minimum tread depth
Standard handrails
✔ 36" minimum height
✔ 240" maximum height
✔ Adds 42" to stair height
Optional handrails
✔ 42" minimum height
✔ 240" maximum height
✔ Adds 5.75" to stair height
Flush handrails
✔ 42" minimum height
✔ 240" maximum height
✔ Flush with top stair riser
Measuring guidelines, sample prints, standard dimensions, connection details, and more. Product resources
Pricing and specifications for stainless steel alternating tread stairs
Alternating tread stairs are custom built to your exact height specifications. See below for pricing in six-inch increments; get a quote for custom stair heights.
| STAIR HEIGHT |
OVERALL/HANDRAIL HEIGHT | STAIR RUN | WEIGHT | PRICE |
|||
| STANDARD | OPTIONAL | 56° | 68° | 56° | 68° | ||
| 36" | 78" | 41.75" | 28.93" | N/A | 83.408# | N/A | $1,896.72 |
| 42" | 84" | 47.75" | 33.11" | 23.08" | 91.976# | 76.944# | $2,093.34 |
| 48" | 90" | 53.75" | 37.25" | 25.66" | 100.544# | 84.936# | $2,289.96 |
| 54" | 96" | 59.75" | 41.37" | 28.2" | 109.112# | 92.928# | $2,486.58 |
| 60" | 102" | 65.75" | 44.91" | 30.28" | 117.68# | 100.92# | $2,683.20 |
| 66" | 108" | 71.75" | 49.07" | 32.83" | 126.248# | 108.912# | $2,879.82 |
| 72" | 114" | 77.75" | 53.21" | 35.36" | 134.816# | 116.904# | $3,076.44 |
| 78" | 120" | 83.75" | 57.33" | 37.86" | 143.384# | 124.896# | $3,273.06 |
| 84" | 126" | 89.75" | 61.44" | 40.04" | 151.952# | 132.888# | $3,469.68 |
| 90" | 132" | 95.75" | 65.15" | 42.56" | 160.52# | 140.88# | $3,666.30 |
| 96" | 138" | 101.75" | 69.27" | 45.05" | 169.088# | 148.872# | $3,862.92 |
| 102" | 144" | 107.75" | 73.39" | 47.28" | 177.656# | 156.864# | $4,059.54 |
| 108" | 150" | 113.75" | 77.49" | 49.78" | 186.224# | 164.856# | $4,256.16 |
| 114" | 156" | 119.75" | 81.59" | 52.27" | 194.792# | 172.848# | $4,452.78 |
| 120" | 162" | 125.75" | 85.38" | 54.75" | 234.56# | 180.84# | $4,649.40 |
| 126" | 168" | 131.75" | 89.49" | 57.01" | 244.688# | 188.832# | $4,846.02 |
| 132" | 174" | 137.75" | 93.59" | 59.5" | 254.816# | 196.824# | $5,042.64 |
| 138" | 180" | 143.75" | 97.68" | 61.98" | 264.944# | 204.816# | $5,239.26 |
| 144" | 186" | 149.75" | 101.77" | 64.45" | 275.072# | 245.272# | $5,435.88 |
| 150" | 192" | 155.75" | 105.62" | 66.74" | 285.2# | 254.2# | $5,632.50 |
| 156" | 198" | 161.75" | 109.71" | 69.21" | 295.328# | 263.128# | $5,829.12 |
| 162" | 204" | 167.75" | 113.8" | 71.68" | 305.456# | 272.056# | $6,025.74 |
| 168" | 210" | 173.75" | 117.89" | 73.98" | 315.584# | 280.984# | $6,222.36 |
| 174" | 216" | 179.75" | 121.97" | 76.45" | 325.712# | 289.912# | $6,418.98 |
| 180" | 222" | 185.75" | 125.85" | 78.92" | 335.84# | 298.84# | $6,615.60 |
| 186" | 228" | 191.75" | 129.94" | 81.38" | 345.968# | 307.768# | $6,812.22 |
| 192" | 234" | 197.75" | 134.02" | 83.7" | 356.096# | 316.696# | $7,008.84 |
| 198" | 240" | 203.75" | 138.11" | 86.16" | 366.224# | 325.624# | $7,205.46 |
| 204" | 246" | 209.75" | 142.19" | 88.62" | 376.352# | 334.552# | $7,402.08 |
| 210" | 252" | 215.75" | 146.09" | 91.08" | 386.48# | 343.48# | $7,598.70 |
| 216" | 258" | 221.75" | 150.17" | 93.41" | 396.608# | 352.408# | $7,795.32 |
| 222" | 264" | 227.75" | 154.25" | 95.87" | 406.736# | 361.336# | $7,991.94 |
| 228" | 270" | 233.75" | 158.33" | 98.33" | 416.864# | 370.264# | $8,188.56 |
| 234" | 276" | 239.75" | 162.4" | 100.78" | 426.992# | 379.192# | $8,385.18 |
| 240" | 282" | 245.75" | 166.32" | 103.12" | 437.12# | 388.12# | $8,581.80 |
All pricing information is presented in good faith and believed to be correct at the time of publishing. We reserve the right to change prices at any time without notice. Prices do not include installation hardware or shipping costs.
About aluminum alternating tread stairs
✔ Lightweight
✔ Resistant to corrosion
Design specifications and options
✔ Custom built to exact height
✔ Central stringer design with alternating treads welded to the handrails
✔ Ships with rubber bumper attached to the center stringer
✔ Overall width of 23"; inside handrail width of 20"
✔ Minimum 8.5" tread depth
✔ Ships fully assembled with handrails attached
68° stair angle only
✔ Riser height of 6.4" to 7.7"
✔ Minimum 8.5" tread depth
Standard handrails
✔ 24" minimum height
✔ 216" maximum height
✔ Adds 42" to stair height
Optional handrails
✔ 24" minimum height
✔ 216" maximum height
✔ Adds 3.75" to stair height
Measuring guidelines, sample prints, standard dimensions, connection details, and more.
Pricing and specifications for aluminum alternating tread stairs
Alternating tread stairs are custom built to your exact height specifications. See below for pricing in six-inch increments; get a quote for custom stair heights.
STAIR HEIGHT |
OVERALL/HANDRAIL HEIGHT | STAIR RUN |
WEIGHT |
PRICE |
|
| STANDARD | OPTIONAL | ||||
| 24" | 66" | 27.75" | 16.2973" | 36.56# | $1,081.63 |
| 30" | 72" | 33.75" | 18.7213" | 40.7# | $1,226.35 |
| 36" | 78" | 39.75" | 21.1453" | 44.84# | $1,371.07 |
| 42" | 84" | 45.75" | 23.5693" | 48.98# | $1,515.79 |
| 48" | 90" | 51.75" | 25.9933" | 53.12# | $1,660.51 |
| 54" | 96" | 57.75" | 28.4173" | 57.26# | $1,805.23 |
| 60" | 102" | 63.75" | 30.8413" | 61.4# | $1,949.95 |
| 66" | 108" | 69.75" | 33.2653" | 65.54# | $2,094.67 |
| 72" | 114" | 75.75" | 35.6893" | 69.68# | $2,239.39 |
| 78" | 120" | 81.75" | 38.1133" | 73.82# | $2,384.11 |
| 84" | 126" | 87.75" | 40.5373" | 77.96# | $2,528.83 |
| 90" | 132" | 93.75" | 42.9613" | 82.1# | $2,673.55 |
| 96" | 138" | 99.75" | 45.3853" | 86.24# | $2,818.27 |
| 102" | 144" | 105.75" | 47.8093" | 90.38# | $2,962.99 |
| 108" | 150" | 111.75" | 50.2333" | 94.52# | $3,107.71 |
| 114" | 156" | 117.75" | 52.6573" | 98.66# | $3,252.43 |
| 120" | 162" | 123.75" | 55.0813" | 102.8# | $3,397.15 |
| 126" | 168" | 129.75" | 57.5053" | 106.94# | $3,541.87 |
| 132" | 174" | 135.75" | 59.9293" | 111.08# | $3,686.59 |
| 138" | 180" | 141.75" | 62.3533" | 115.22# | $3,831.31 |
| 144" | 186" | 147.75" | 64.7773" | 119.36# | $3,976.03 |
| 150" | 192" | 153.75" | 67.2013" | 123.5# | $4,120.75 |
| 156" | 198" | 159.75" | 69.6253" | 127.64# | $4,265.47 |
| 162" | 204" | 165.75" | 72.0493" | 131.78# | $4,410.19 |
| 168" | 210" | 171.75" | 74.4733" | 135.92# | $4,554.91 |
| 174" | 216" | 177.75" | 76.8973" | 140.06# | $4,699.63 |
| 180" | 222" | 183.75" | 79.3213" | 144.2# | $4,844.35 |
| 186" | 228" | 189.75" | 81.7453" | 148.34# | $4,989.07 |
| 192" | 234" | 195.75" | 84.1693" | 152.48# | $5,133.79 |
| 198" | 240" | 201.75" | 86.5933" | 156.62# | $5,278.51 |
| 204" | 246" | 207.75" | 89.0173" | 160.76# | $5,423.23 |
| 210" | 252" | 213.75" | 91.4413" | 164.9# | $5,567.95 |
| 216" | 258" | 219.75" | 93.8653" | 169.04# | $5,712.67 |
All pricing information is presented in good faith and believed to be correct at the time of publishing. We reserve the right to change prices at any time without notice. Prices do not include installation hardware or shipping costs.
Download a PDF with alternating tread stair pricing:
Types of alternating tread stairs
About carbon steel alternating tread stairs with a powder coat finish
- Our most popular and most used type of alternating tread stair
- Ideal for most indoor applications
Design specifications and options
- Custom built to exact height
- Three-stringer design with alternating treads welded to the stringers
- Ships with rubber bumper attached to the center stringer
- Overall width of 23"; inside handrail width of 20"
- Minimum 8.5" tread depth
- Handrails ship unattached and bolt into place during installation
Choice of stair angle
56° stair angle
- Riser height of 7.5" to 9"
- 8.5" minimum tread depth
68° stair angle
- Riser height of 6.4" to 7.7"
- 8.5" minimum tread depth
Choice of handrail type
Standard handrails
- 36" minimum stair height
- 240" maximum stair height
- Adds 42" to stair height
Optional handrails
- 42" minimum stair height
- 240" maximum stair height
- Adds 5.75" to stair height
Flush handrails
- 42" minimum stair height
- 240" maximum stair height
- Flush with top stair riser
Measuring guidelines, sample prints, standard dimensions, connection details, and more.
Pricing and specifications for carbon steel alternating tread stairs with a powder coat finish
Alternating tread stairs are custom built to your exact height specifications. See below for pricing in six-inch increments; get a quote for custom stair heights.
| STAIR HEIGHT |
OVERALL/HANDRAIL HEIGHT | STAIR RUN | WEIGHT | PRICE | ||||
| STANDARD | OPTIONAL | 56° | 68° | 56° | 68° | STANDARD COLORS | CUSTOM COLORS | |
| 36" | 78" | 41.75" | 28.93" | N/A | 83.408# | N/A | $1,047.47 | $1,337.35 |
| 42" | 84" | 47.75" | 33.11" | 23.08" | 91.976# | 76.944# | $1,163.99 | $1,462.75 |
| 48" | 90" | 53.75" | 37.25" | 25.66" | 100.544# | 84.936# | $1,280.51 | $1,588.15 |
| 54" | 96" | 59.75" | 41.37" | 28.2" | 109.112# | 92.928# | $1,397.03 | $1,713.55 |
| 60" | 102" | 65.75" | 44.91" | 30.28" | 117.68# | 100.92# | $1,513.55 | $1,838.95 |
| 66" | 108" | 71.75" | 49.07" | 32.83" | 126.248# | 108.912# | $1,630.07 | $1,964.35 |
| 72" | 114" | 77.75" | 53.21" | 35.36" | 134.816# | 116.904# | $1,746.59 | $2,089.75 |
| 78" | 120" | 83.75" | 57.33" | 37.86" | 143.384# | 124.896# | $1,863.11 | $2,215.15 |
| 84" | 126" | 89.75" | 61.44" | 40.04" | 151.952# | 132.888# | $1,979.63 | $2,340.55 |
| 90" | 132" | 95.75" | 65.15" | 42.56" | 160.52# | 140.88# | $2,096.15 | $2,465.95 |
| 96" | 138" | 101.75" | 69.27" | 45.05" | 169.088# | 148.872# | $2,212.67 | $2,591.35 |
| 102" | 144" | 107.75" | 73.39" | 47.28" | 177.656# | 156.864# | $2,329.19 | $2,716.75 |
| 108" | 150" | 113.75" | 77.49" | 49.78" | 186.224# | 164.856# | $2,445.71 | $2,842.15 |
| 114" | 156" | 119.75" | 81.59" | 52.27" | 194.792# | 172.848# | $2,562.23 | $2,967.55 |
| 120" | 162" | 125.75" | 85.38" | 54.75" | 234.56# | 180.84# | $2,678.75 | $3,092.95 |
| 126" | 168" | 131.75" | 89.49" | 57.01" | 244.688# | 188.832# | $2,795.27 | $3,218.35 |
| 132" | 174" | 137.75" | 93.59" | 59.5" | 254.816# | 196.824# | $2,911.79 | $3,343.75 |
| 138" | 180" | 143.75" | 97.68" | 61.98" | 264.944# | 204.816# | $3,028.31 | $3,469.15 |
| 144" | 186" | 149.75" | 101.77" | 64.45" | 275.072# | 245.272# | $3,144.83 | $3,594.55 |
| 150" | 192" | 155.75" | 105.62" | 66.74" | 285.2# | 254.2# | $3,261.35 | $3,719.95 |
| 156" | 198" | 161.75" | 109.71" | 69.21" | 295.328# | 263.128# | $3,377.87 | $3,845.35 |
| 162" | 204" | 167.75" | 113.8" | 71.68" | 305.456# | 272.056# | $3,494.39 | $3,970.75 |
| 168" | 210" | 173.75" | 117.89" | 73.98" | 315.584# | 280.984# | $3,610.91 | $4,096.15 |
| 174" | 216" | 179.75" | 121.97" | 76.45" | 325.712# | 289.912# | $3,727.43 | $4,221.55 |
| 180" | 222" | 185.75" | 125.85" | 78.92" | 335.84# | 298.84# | $3,843.95 | $4,346.95 |
| 186" | 228" | 191.75" | 129.94" | 81.38" | 345.968# | 307.768# | $3,960.47 | $4,472.35 |
| 192" | 234" | 197.75" | 134.02" | 83.7" | 356.096# | 316.696# | $4,076.99 | $4,597.75 |
| 198" | 240" | 203.75" | 138.11" | 86.16" | 366.224# | 325.624# | $4,193.51 | $4,723.15 |
| 204" | 246" | 209.75" | 142.19" | 88.62" | 376.352# | 334.552# | $4,310.03 | $4,848.55 |
| 210" | 252" | 215.75" | 146.09" | 91.08" | 386.48# | 343.48# | $4,426.55 | $4,973.95 |
| 216" | 258" | 221.75" | 150.17" | 93.41" | 396.608# | 352.408# | $4,543.07 | $5,099.35 |
| 222" | 264" | 227.75" | 154.25" | 95.87" | 406.736# | 361.336# | $4,659.59 | $5,224.75 |
| 228" | 270" | 233.75" | 158.33" | 98.33" | 416.864# | 370.264# | $4,776.11 | $5,350.15 |
| 234" | 276" | 239.75" | 162.4" | 100.78" | 426.992# | 379.192# | $4,892.63 | $5,475.55 |
| 240" | 282" | 245.75" | 166.32" | 103.12" | 437.12# | 388.12# | $5,009.15 | $5,600.95 |
All pricing information is presented in good faith and believed to be correct at the time of publishing. We reserve the right to change prices at any time without notice. Prices do not include installation hardware or shipping costs.
About carbon steel alternating tread stairs with a galvanized finish
- Hot-dipped galvanized finish
- Ideal for outdoor applications
Design specifications and options
- Custom built to exact height
- Three-stringer design with alternating treads welded to the stringers
- Ships with rubber bumper attached to the center stringer
- Overall width of 23"; inside handrail width of 20"
- Minimum 8.5" tread depth
- Handrails ship unattached and bolt into place during installation
Choice of stair angle
56° stair angle
- Riser height of 7.5" to 9"
- 8.5" minimum tread depth
68° stair angle
- Riser height of 6.4" to 7.7"
- 8.5" minimum tread depth
Choice of handrail type
Standard handrails
- 36" minimum stair height
- 240" maximum stair height
- Adds 42" to stair height
Optional handrails
- 42" minimum stair height
- 240" maximum stair height
- Adds 5.75" to stair height
Flush handrails
- 42" minimum stair height
- 240" maximum stair height
- Flush with top stair riser
Measuring guidelines, sample prints, standard dimensions, connection details, and more.
Pricing and specifications for carbon steel alternating tread stairs with a galvanized finish
Alternating tread stairs are custom built to your exact height specifications. See below for pricing in six-inch increments; get a quote for custom stair heights.
| STAIR HEIGHT |
OVERALL/HANDRAIL HEIGHT | STAIR RUN | WEIGHT | PRICE |
|||
| STANDARD | OPTIONAL | 56° | 68° | 56° | 68° | ||
| 36" | 78" | 41.75" | 28.93" | N/A | 83.408# | N/A | $1,226.42 |
| 42" | 84" | 47.75" | 33.11" | 23.08" | 91.976# | 76.944# | $1,362.26 |
| 48" | 90" | 53.75" | 37.25" | 25.66" | 100.544# | 84.936# | $1,498.10 |
| 54" | 96" | 59.75" | 41.37" | 28.2" | 109.112# | 92.928# | $1,633.94 |
| 60" | 102" | 65.75" | 44.91" | 30.28" | 117.68# | 100.92# | $1,769.78 |
| 66" | 108" | 71.75" | 49.07" | 32.83" | 126.248# | 108.912# | $1,905.62 |
| 72" | 114" | 77.75" | 53.21" | 35.36" | 134.816# | 116.904# | $2,041.46 |
| 78" | 120" | 83.75" | 57.33" | 37.86" | 143.384# | 124.896# | $2,177.30 |
| 84" | 126" | 89.75" | 61.44" | 40.04" | 151.952# | 132.888# | $2,313.14 |
| 90" | 132" | 95.75" | 65.15" | 42.56" | 160.52# | 140.88# | $2,448.98 |
| 96" | 138" | 101.75" | 69.27" | 45.05" | 169.088# | 148.872# | $2,584.82 |
| 102" | 144" | 107.75" | 73.39" | 47.28" | 177.656# | 156.864# | $2,720.66 |
| 108" | 150" | 113.75" | 77.49" | 49.78" | 186.224# | 164.856# | $2,856.50 |
| 114" | 156" | 119.75" | 81.59" | 52.27" | 194.792# | 172.848# | $2,992.34 |
| 120" | 162" | 125.75" | 85.38" | 54.75" | 234.56# | 180.84# | $3,128.18 |
| 126" | 168" | 131.75" | 89.49" | 57.01" | 244.688# | 188.832# | $3,264.02 |
| 132" | 174" | 137.75" | 93.59" | 59.5" | 254.816# | 196.824# | $3,399.86 |
| 138" | 180" | 143.75" | 97.68" | 61.98" | 264.944# | 204.816# | $3,535.70 |
| 144" | 186" | 149.75" | 101.77" | 64.45" | 275.072# | 245.272# | $3,671.54 |
| 150" | 192" | 155.75" | 105.62" | 66.74" | 285.2# | 254.2# | $3,807.38 |
| 156" | 198" | 161.75" | 109.71" | 69.21" | 295.328# | 263.128# | $3,943.22 |
| 162" | 204" | 167.75" | 113.8" | 71.68" | 305.456# | 272.056# | $4,079.06 |
| 168" | 210" | 173.75" | 117.89" | 73.98" | 315.584# | 280.984# | $4,214.90 |
| 174" | 216" | 179.75" | 121.97" | 76.45" | 325.712# | 289.912# | $4,350.74 |
| 180" | 222" | 185.75" | 125.85" | 78.92" | 335.84# | 298.84# | $4,486.58 |
| 186" | 228" | 191.75" | 129.94" | 81.38" | 345.968# | 307.768# | $4,622.42 |
| 192" | 234" | 197.75" | 134.02" | 83.7" | 356.096# | 316.696# | $4,758.26 |
| 198" | 240" | 203.75" | 138.11" | 86.16" | 366.224# | 325.624# | $4,894.10 |
| 204" | 246" | 209.75" | 142.19" | 88.62" | 376.352# | 334.552# | $5,029.94 |
| 210" | 252" | 215.75" | 146.09" | 91.08" | 386.48# | 343.48# | $5,165.78 |
| 216" | 258" | 221.75" | 150.17" | 93.41" | 396.608# | 352.408# | $5,301.62 |
| 222" | 264" | 227.75" | 154.25" | 95.87" | 406.736# | 361.336# | $5,437.46 |
| 228" | 270" | 233.75" | 158.33" | 98.33" | 416.864# | 370.264# | $5,573.30 |
| 234" | 276" | 239.75" | 162.4" | 100.78" | 426.992# | 379.192# | $5,709.14 |
| 240" | 282" | 245.75" | 166.32" | 103.12" | 437.12# | 388.12# | $5,844.98 |
All pricing information is presented in good faith and believed to be correct at the time of publishing. We reserve the right to change prices at any time without notice. Prices do not include installation hardware or shipping costs.
About stainless steel alternating tread stairs
- Grade 304 stainless steel
- Easy to clean
Design specifications and options
- Custom built to exact height
- Three-stringer design with alternating treads welded to the stringers
- Ships with rubber bumper attached to the center stringer
- Overall width of 23"; inside handrail width of 20"
- Minimum 8.5" tread depth
- Handrails ship unattached and bolt into place during installation
Choice of stair angle
56° stair angle
- Riser height of 7.5" to 9"
- 8.5" minimum tread depth
68° stair angle
- Riser height of 6.4" to 7.7"
- 8.5" minimum tread depth
Choice of handrail type
Standard handrails
- 36" minimum stair height
- 240" maximum stair height
- Adds 42" to stair height
Optional handrails
- 42" minimum stair height
- 240" maximum stair height
- Adds 5.75" to stair height
Flush handrails
- 42" minimum stair height
- 240" maximum stair height
- Flush with top stair riser
Measuring guidelines, sample prints, standard dimensions, connection details, and more.
Pricing and specifications for stainless steel alternating tread stairs
Alternating tread stairs are custom built to your exact height specifications. See below for pricing in six-inch increments; get a quote for custom stair heights.
| STAIR HEIGHT |
OVERALL/HANDRAIL HEIGHT | STAIR RUN | WEIGHT | PRICE |
|||
| STANDARD | OPTIONAL | 56° | 68° | 56° | 68° | ||
| 36" | 78" | 41.75" | 28.93" | N/A | 83.408# | N/A | $1,896.72 |
| 42" | 84" | 47.75" | 33.11" | 23.08" | 91.976# | 76.944# | $2,093.34 |
| 48" | 90" | 53.75" | 37.25" | 25.66" | 100.544# | 84.936# | $2,289.96 |
| 54" | 96" | 59.75" | 41.37" | 28.2" | 109.112# | 92.928# | $2,486.58 |
| 60" | 102" | 65.75" | 44.91" | 30.28" | 117.68# | 100.92# | $2,683.20 |
| 66" | 108" | 71.75" | 49.07" | 32.83" | 126.248# | 108.912# | $2,879.82 |
| 72" | 114" | 77.75" | 53.21" | 35.36" | 134.816# | 116.904# | $3,076.44 |
| 78" | 120" | 83.75" | 57.33" | 37.86" | 143.384# | 124.896# | $3,273.06 |
| 84" | 126" | 89.75" | 61.44" | 40.04" | 151.952# | 132.888# | $3,469.68 |
| 90" | 132" | 95.75" | 65.15" | 42.56" | 160.52# | 140.88# | $3,666.30 |
| 96" | 138" | 101.75" | 69.27" | 45.05" | 169.088# | 148.872# | $3,862.92 |
| 102" | 144" | 107.75" | 73.39" | 47.28" | 177.656# | 156.864# | $4,059.54 |
| 108" | 150" | 113.75" | 77.49" | 49.78" | 186.224# | 164.856# | $4,256.16 |
| 114" | 156" | 119.75" | 81.59" | 52.27" | 194.792# | 172.848# | $4,452.78 |
| 120" | 162" | 125.75" | 85.38" | 54.75" | 234.56# | 180.84# | $4,649.40 |
| 126" | 168" | 131.75" | 89.49" | 57.01" | 244.688# | 188.832# | $4,846.02 |
| 132" | 174" | 137.75" | 93.59" | 59.5" | 254.816# | 196.824# | $5,042.64 |
| 138" | 180" | 143.75" | 97.68" | 61.98" | 264.944# | 204.816# | $5,239.26 |
| 144" | 186" | 149.75" | 101.77" | 64.45" | 275.072# | 245.272# | $5,435.88 |
| 150" | 192" | 155.75" | 105.62" | 66.74" | 285.2# | 254.2# | $5,632.50 |
| 156" | 198" | 161.75" | 109.71" | 69.21" | 295.328# | 263.128# | $5,829.12 |
| 162" | 204" | 167.75" | 113.8" | 71.68" | 305.456# | 272.056# | $6,025.74 |
| 168" | 210" | 173.75" | 117.89" | 73.98" | 315.584# | 280.984# | $6,222.36 |
| 174" | 216" | 179.75" | 121.97" | 76.45" | 325.712# | 289.912# | $6,418.98 |
| 180" | 222" | 185.75" | 125.85" | 78.92" | 335.84# | 298.84# | $6,615.60 |
| 186" | 228" | 191.75" | 129.94" | 81.38" | 345.968# | 307.768# | $6,812.22 |
| 192" | 234" | 197.75" | 134.02" | 83.7" | 356.096# | 316.696# | $7,008.84 |
| 198" | 240" | 203.75" | 138.11" | 86.16" | 366.224# | 325.624# | $7,205.46 |
| 204" | 246" | 209.75" | 142.19" | 88.62" | 376.352# | 334.552# | $7,402.08 |
| 210" | 252" | 215.75" | 146.09" | 91.08" | 386.48# | 343.48# | $7,598.70 |
| 216" | 258" | 221.75" | 150.17" | 93.41" | 396.608# | 352.408# | $7,795.32 |
| 222" | 264" | 227.75" | 154.25" | 95.87" | 406.736# | 361.336# | $7,991.94 |
| 228" | 270" | 233.75" | 158.33" | 98.33" | 416.864# | 370.264# | $8,188.56 |
| 234" | 276" | 239.75" | 162.4" | 100.78" | 426.992# | 379.192# | $8,385.18 |
| 240" | 282" | 245.75" | 166.32" | 103.12" | 437.12# | 388.12# | $8,581.80 |
All pricing information is presented in good faith and believed to be correct at the time of publishing. We reserve the right to change prices at any time without notice. Prices do not include installation hardware or shipping costs.
More space? Choose a standard stair
Choose standard stairs for applications without space restrictions. They require more space to install than alternating tread stairs but they are also the most comfortable to use.
Less space? Choose an alternating tread stair
For applications where space is limited, choose alternating tread stairs. 68° alternating tread stairs require the least amount of space but the steeper angle is less comfortable to use. The less steep angle of 56° alternating tread stairs is more comfortable to use while also requiring less space.
What does OSHA say?
OSHA classifies alternating tread stairs (alternating tread devices) as non-standard stairs and states they are acceptable to use in applications where it is not feasible to use standard stairs.
§1910.25(b)(8)
How to determine which stair is the best fit
The three factors to consider when installing a stair are the stair angle/slope, the vertical height/rise of the stair and the horizontal projection/run of the stair.
To comply with the current OSHA standards for general industry, standard stairs must be installed at an angle of 45° or less to the horizontal and alternating tread stairs must be installed at an angle between 50° and 70° to the horizontal. The stair rise is determined by your application and vertical distance between the lower surface and upper surface that the stair will connect. The horizontal projection of a stair is the amount of floor space needed to install a stair and is calculated based on the angle and rise.
Use the chart below to estimate the amount of floor space needed based on stair height. If you have enough space to accommodate a standard stair, that is your best option. If not, an alternating tread stair is an OSHA-compliant solution.
HORIZONTAL PROJECTION BY STAIR TYPE |
|||
VERTICAL HEIGHT |
68° ALTERNATING TREAD STAIR |
56° ALTERNATING TREAD STAIR |
OSHA-COMPLIANT STANDARD STAIR |
4' |
2'2" |
3'11" |
4'3" |
6' |
2'11" |
4'5" |
5'10" |
8' |
3'9" |
5'9" |
8'2" |
10' |
4'7" |
7'1" |
9'9" |
12' |
5'4" |
8'6" |
12'2" |
14' |
6'2" |
9'10" |
13'9" |
16' |
7' |
11'2" |
16'1" |
18' |
7'10" |
12'6" |
17'8" |
20' |
8'7" |
13'10" |
20'1" |
NOTE: This chart is intended for illustrative purposes only; all measurements are rounded up to the nearest inch.
68° alternating tread stair versus standard stair
68° alternating tread stair versus 56° alternating tread stair
More space? Choose a standard stair
Choose standard stairs for applications without space restrictions. They require more space to install than alternating tread stairs but they are also the most comfortable to use.
Less space? Choose an alternating tread stair
For applications where space is limited, choose alternating tread stairs. 68° alternating tread stairs require the least amount of space but the steeper angle is less comfortable to use. The less steep angle of 56° alternating tread stairs is more comfortable to use while also requiring less space.
What does OSHA say?
OSHA classifies alternating tread stairs (alternating tread devices) as non-standard stairs and states they are acceptable to use in applications where it is not feasible to use standard stairs.
§1910.25(b)(8)
How to determine which stair is the best fit
The three factors to consider when installing a stair are the stair angle/slope, the vertical height/rise of the stair and the horizontal projection/run of the stair.
To comply with the current OSHA standards for general industry, standard stairs must be installed at an angle of 45° or less to the horizontal and alternating tread stairs must be installed at an angle between 50° and 70° to the horizontal. The stair rise is determined by your application and vertical distance between the lower surface and upper surface that the stair will connect. The horizontal projection of a stair is the amount of floor space needed to install a stair and is calculated based on the angle and rise.
Use the chart below to estimate the amount of floor space needed based on stair height. If you have enough space to accommodate a standard stair, that is your best option. If not, an alternating tread stair is an OSHA-compliant solution.
HORIZONTAL PROJECTION BY STAIR TYPE |
|||
VERTICAL HEIGHT |
68° ALTERNATING TREAD STAIR |
56° ALTERNATING TREAD STAIR |
OSHA-COMPLIANT STANDARD STAIR |
4' |
2'2" |
3'11" |
4'3" |
6' |
2'11" |
4'5" |
5'10" |
8' |
3'9" |
5'9" |
8'2" |
10' |
4'7" |
7'1" |
9'9" |
12' |
5'4" |
8'6" |
12'2" |
14' |
6'2" |
9'10" |
13'9" |
16' |
7' |
11'2" |
16'1" |
18' |
7'10" |
12'6" |
17'8" |
20' |
8'7" |
13'10" |
20'1" |
NOTE: This chart is intended for illustrative purposes only; all measurements are rounded up to the nearest inch.
68° alternating tread stair versus standard stair
68° alternating tread stair versus 56° alternating tread stair
Virginia Tech conducted a study comparing alternating tread stairs to ship stairs and concluded that alternating tread stairs have a clear comfort and safety advantage over ship stairs.
| Test subjects strongly preferred alternating tread stairs over ship stairs for safety and comfort: | |
| 89% | Chose for safer tread depth |
| 85% | Chose for more comfortable tread depth |
| 72% | Chose for safer ascent |
| 89% | Chose for more comfortable ascent |
| 82% | Chose for safer descent |
| 85% | Chose for more comfortable descent |
| More missteps occurred on the ship stair than the alternating tread stair: | |
| 72% | Chose for safer tread depth |
| 129% | Chose for more comfortable tread depth |
| Test subjects felt less safe and comfortable on the ship stair that than the alternating tread stair: | |
| 64% | Felt more likely to slip/trip on ascent |
| 85% | Felt more likely to slip/trip on descent |
The alternating tread stair study was conducted by the Department of Industrial Engineering at Virginia Polytechnic Institute and published in the proceedings of the Human Factors Society’s 32nd Annual Meeting, pp 981-984. View findings.
Complete the form below to download a PDF with more information about the safety and ergonomics of steep-angle devices:
✔ More tread depth
OSHA requires a minimum tread depth of 8.5" for alternating tread stairs. More useable tread depth means the entire foot is supported. §1910.25(f)
☓ Less tread depth
OSHA requires a minimum tread depth of 4" for ship stairs. Less tread depth means half of the foot is unsupported which is less stable. §1910.25(e)
Ladders and fall injuries
Ladders are consistently one of OSHA's top ten most cited violations for general industry. The need to address the hazard they present in the workplace was one of the reasons for the 2017 update to the Walking-Working Surfaces standard. Source: Federal Registry, Vol. 61, No. 223
Number of workplace injuries due to falls from a fixed ladder
SOURCE: Center for Disease Control, 2017
Number of fixed ladder fall injuries that required hospitalization
SOURCE: Center for Disease Control, 2017
Median days missed for injuries due to ladder falls
SOURCE: Bureau of Labor Statistics, 2011-2016
Number of fall injuries due to stairs that required hospitalization
SOURCE: Center for Disease Control, 2017
Fall from ladders account for 20% of all fatal and lost work-day injuries in general industry. SOURCE: Bureau of Labor Statistics
Ladders and musculoskeletal disorders
The National Institute for Occupational Safety and Health defines musculoskeletal disorder (MSD) as a soft-tissue injury caused by sudden or sustained exposure to repetitive motion, force, vibration, and awkward positions.
Total MSDs due to ladders (vs. 740 due to stairs)
SOURCE: Bureau of Labor Statistics, 2011-2016
Average cost of a MSD-related workers’ compensation claim
SOURCE: Center for Disease Control
Median days missed for MSD injuries (vs. 8 for non-MSD injuries)
SOURCE: Bureau of Labor Statistics, 2011-2016
Percent of MSDs that could be prevented
SOURCE: Center for Disease Control
More usable tread depth makes alternating tread stairs safer and more comfortable to use than ship stairs
✔ More tread depthOSHA requires a minimum tread depth of 8.5" for alternating tread stairs. More useable tread depth means the entire foot is supported. §1910.25(f)
☓ Less tread depthOSHA requires a minimum tread depth of 4" for ship stairs. Less tread depth means half of the foot is unsupported which is less stable. §1910.25(e)
Ladders and fall injuries
Ladders are consistently one of OSHA's top ten most cited violations for general industry. The need to address the hazard they present in the workplace was one of the reasons for the 2017 update to the Walking-Working Surfaces standard. Source: Federal Registry, Vol. 61, No. 223
Number of workplace injuries due to falls from a fixed ladder
SOURCE: Center for Disease Control, 2017
Number of fixed ladder fall injuries that required hospitalization
SOURCE: Center for Disease Control, 2017
Median days missed for injuries due to ladder falls
SOURCE: Bureau of Labor Statistics, 2011-2016
Number of fall injuries due to stairs that required hospitalization
SOURCE: Center for Disease Control, 2017
Fall from ladders account for 20% of all fatal and lost work-day injuries in general industry. SOURCE: Bureau of Labor Statistics
Ladders and musculoskeletal disorders
The National Institute for Occupational Safety and Health defines musculoskeletal disorder (MSD) as a soft-tissue injury caused by sudden or sustained exposure to repetitive motion, force, vibration, and awkward positions.
Total MSDs due to ladders (vs. 740 due to stairs)
SOURCE: Bureau of Labor Statistics, 2011-2016
Average cost of a MSD-related workers’ compensation claim
SOURCE: Center for Disease Control
Median days missed for MSD injuries (vs. 8 for non-MSD injuries)
SOURCE: Bureau of Labor Statistics, 2011-2016
Percent of MSDs that could be prevented
SOURCE: Center for Disease Control