Alternating Tread Stairs, Ship Stairs, Ships Ladders

Alternating tread stairs

Carbon steel, stainless steel, and aluminum alternating tread stairs are an OSHA-compliant, space-saving solution when a standard stair is not feasible.

BUY ONLINE

Carbon steel alternating tread stairs with powder coat finish
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 alternating tread stairs with galvanized finish
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 alternating tread stairs
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 alternating tread stairs
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 stairs
Standard stair

Each foot normally uses only about half of each tread, stepping out and over the unused section.

Learn more

Ship stairs
Ship stair

The unused half tread becomes an obstacle by reducing the usable depth of the tread below.

Learn more

Alternating tread stair
Alternating tread stair

The unused half tread is removed to provide more tread depth for improved safety and comfort.

How to use


Alternating Tread Stair Diagram
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 stairs.

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 alternating tread stairs with powder coat finish
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

View product

Carbon steel alternating tread stairs with galvanized finish
Carbon steel, galvanized finish
  • Ideal for outdoor use
  • Hot dip galvanized finish
  • Choice of three handrail options
  • Choice of 56 or 68 degree angle

View product

Stainless steel alternating tread stairs
Stainless steel, natural finish
  • Easy to clean
  • Grade 304 stainless steel
  • Choice of three handrail options
  • Choice of 56 or 68 degree angle

View product

Aluminum alternating tread stairs
Aluminum, natural finish
  • Lightweight
  • Resists corrosion
  • Choice of two handrail options
  • 68 degree angle only

View product

Carbon steel alternating tread stairs with powder coat finish
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 alternating tread stairs with galvanized finish
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 alternating tread stairs
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 alternating tread stairs
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 stairs
Standard stair

Each foot normally uses only about half of each tread, stepping out and over the unused section.

Learn more

Ship stairs
Ship stair

The unused half tread becomes an obstacle by reducing the usable depth of the tread below.

Learn more

Alternating tread stair
Alternating tread stair

The unused half tread is removed to provide more tread depth for improved safety and comfort.

How to use


Alternating Tread Stair Diagram
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

Switchbacks
Crane
Conveyor
Augusta
Mezzanine
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.

RAL Color Chart

Measuring guidelines, sample prints, standard dimensions, connection details, and more.

Product resources

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 $941.85 $1,202.35
42" 84" 47.75" 33.11" 23.08" 91.976# 76.944# $1,046.63 $1,315.11
48" 90" 53.75" 37.25" 25.66" 100.544# 84.936# $1,151.41 $1,427.86
54" 96" 59.75" 41.37" 28.2" 109.112# 92.928# $1,256.19 $1,540.61
60" 102" 65.75" 44.91" 30.28" 117.68# 100.92# $1,360.97 $1,653.36
66" 108" 71.75" 49.07" 32.83" 126.248# 108.912# $1,465.75 $1,766.11
72" 114" 77.75" 53.21" 35.36" 134.816# 116.904# $1,570.54 $1,878.87
78" 120" 83.75" 57.33" 37.86" 143.384# 124.896# $1,675.32 $1,991.62
84" 126" 89.75" 61.44" 40.04" 151.952# 132.888# $1,780.10 $2,104.37
90" 132" 95.75" 65.15" 42.56" 160.52# 140.88# $1,884.88 $2,217.12
96" 138" 101.75" 69.27" 45.05" 169.088# 148.872# $1,989.66 $2,329.87
102" 144" 107.75" 73.39" 47.28" 177.656# 156.864# $2,094.44 $2,442.63
108" 150" 113.75" 77.49" 49.78" 186.224# 164.856# $2,199.23 $2,555.38
114" 156" 119.75" 81.59" 52.27" 194.792# 172.848# $2,304.01 $2,668.13
120" 162" 125.75" 85.38" 54.75" 234.56# 180.84# $2,408.79 $2,780.88
126" 168" 131.75" 89.49" 57.01" 244.688# 188.832# $2,513.57 $2,893.63
132" 174" 137.75" 93.59" 59.5" 254.816# 196.824# $2,618.35 $3,006.39
138" 180" 143.75" 97.68" 61.98" 264.944# 204.816# $2,723.13 $3,119.14
144" 186" 149.75" 101.77" 64.45" 275.072# 245.272# $2,827.92 $3,231.89
150" 192" 155.75" 105.62" 66.74" 285.2# 254.2# $2,932.70 $3,344.64
156" 198" 161.75" 109.71" 69.21" 295.328# 263.128# $3,037.48 $3,457.39
162" 204" 167.75" 113.8" 71.68" 305.456# 272.056# $3,142.26 $3,570.15
168" 210" 173.75" 117.89" 73.98" 315.584# 280.984# $3,247.04 $3,682.90
174" 216" 179.75" 121.97" 76.45" 325.712# 289.912# $3,351.82 $3,795.65
180" 222" 185.75" 125.85" 78.92" 335.84# 298.84# $3,456.60 $3,908.40
186" 228" 191.75" 129.94" 81.38" 345.968# 307.768# $3,561.39 $4,021.15
192" 234" 197.75" 134.02" 83.7" 356.096# 316.696# $3,666.17 $4,133.91
198" 240" 203.75" 138.11" 86.16" 366.224# 325.624# $3,770.95 $4,246.66
204" 246" 209.75" 142.19" 88.62" 376.352# 334.552# $3,875.73 $4,359.41
210" 252" 215.75" 146.09" 91.08" 386.48# 343.48# $3,980.51 $4,472.16
216" 258" 221.75" 150.17" 93.41" 396.608# 352.408# $4,085.29 $4,584.91
222" 264" 227.75" 154.25" 95.87" 406.736# 361.336# $4,190.08 $4,697.67
228" 270" 233.75" 158.33" 98.33" 416.864# 370.264# $4,294.86 $4,810.42
234" 276" 239.75" 162.4" 100.78" 426.992# 379.192# $4,399.64 $4,923.17
240" 282" 245.75" 166.32" 103.12" 437.12# 388.12# $4,504.42 $5,035.92

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 $1,102.32
42" 84" 47.75" 33.11" 23.08" 91.976# 76.944# $1,224.41
48" 90" 53.75" 37.25" 25.66" 100.544# 84.936# $1,346.49
54" 96" 59.75" 41.37" 28.2" 109.112# 92.928# $1,468.57
60" 102" 65.75" 44.91" 30.28" 117.68# 100.92# $1,590.66
66" 108" 71.75" 49.07" 32.83" 126.248# 108.912# $1,712.74
72" 114" 77.75" 53.21" 35.36" 134.816# 116.904# $1,834.82
78" 120" 83.75" 57.33" 37.86" 143.384# 124.896# $1,956.91
84" 126" 89.75" 61.44" 40.04" 151.952# 132.888# $2,078.99
90" 132" 95.75" 65.15" 42.56" 160.52# 140.88# $2,201.07
96" 138" 101.75" 69.27" 45.05" 169.088# 148.872# $2,323.16
102" 144" 107.75" 73.39" 47.28" 177.656# 156.864# $2,445.24
108" 150" 113.75" 77.49" 49.78" 186.224# 164.856# $2,567.32
114" 156" 119.75" 81.59" 52.27" 194.792# 172.848# $2,689.41
120" 162" 125.75" 85.38" 54.75" 234.56# 180.84# $2,811.49
126" 168" 131.75" 89.49" 57.01" 244.688# 188.832# $2,933.57
132" 174" 137.75" 93.59" 59.5" 254.816# 196.824# $3,055.65
138" 180" 143.75" 97.68" 61.98" 264.944# 204.816# $3,177.74
144" 186" 149.75" 101.77" 64.45" 275.072# 245.272# $3,299.82
150" 192" 155.75" 105.62" 66.74" 285.2# 254.2# $3,421.90
156" 198" 161.75" 109.71" 69.21" 295.328# 263.128# $3,543.99
162" 204" 167.75" 113.8" 71.68" 305.456# 272.056# $3,666.07
168" 210" 173.75" 117.89" 73.98" 315.584# 280.984# $3,788.15
174" 216" 179.75" 121.97" 76.45" 325.712# 289.912# $3,910.24
180" 222" 185.75" 125.85" 78.92" 335.84# 298.84# $4,032.32
186" 228" 191.75" 129.94" 81.38" 345.968# 307.768# $4,154.40
192" 234" 197.75" 134.02" 83.7" 356.096# 316.696# $4,276.49
198" 240" 203.75" 138.11" 86.16" 366.224# 325.624# $4,398.57
204" 246" 209.75" 142.19" 88.62" 376.352# 334.552# $4,520.65
210" 252" 215.75" 146.09" 91.08" 386.48# 343.48# $4,642.74
216" 258" 221.75" 150.17" 93.41" 396.608# 352.408# $4,764.82
222" 264" 227.75" 154.25" 95.87" 406.736# 361.336# $4,886.90
228" 270" 233.75" 158.33" 98.33" 416.864# 370.264# $5,008.99
234" 276" 239.75" 162.4" 100.78" 426.992# 379.192# $5,131.07
240" 282" 245.75" 166.32" 103.12" 437.12# 388.12# $5,253.15

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 $1,656.63
42" 84" 47.75" 33.11" 23.08" 91.976# 76.944# $1,828.35
48" 90" 53.75" 37.25" 25.66" 100.544# 84.936# $2,000.07
54" 96" 59.75" 41.37" 28.2" 109.112# 92.928# $2,171.79
60" 102" 65.75" 44.91" 30.28" 117.68# 100.92# $2,343.51
66" 108" 71.75" 49.07" 32.83" 126.248# 108.912# $2,515.23
72" 114" 77.75" 53.21" 35.36" 134.816# 116.904# $2,686.95
78" 120" 83.75" 57.33" 37.86" 143.384# 124.896# $2,858.67
84" 126" 89.75" 61.44" 40.04" 151.952# 132.888# $3,030.39
90" 132" 95.75" 65.15" 42.56" 160.52# 140.88# $3,202.11
96" 138" 101.75" 69.27" 45.05" 169.088# 148.872# $3,373.83
102" 144" 107.75" 73.39" 47.28" 177.656# 156.864# $3,545.55
108" 150" 113.75" 77.49" 49.78" 186.224# 164.856# $3,717.27
114" 156" 119.75" 81.59" 52.27" 194.792# 172.848# $3,888.99
120" 162" 125.75" 85.38" 54.75" 234.56# 180.84# $4,060.71
126" 168" 131.75" 89.49" 57.01" 244.688# 188.832# $4,232.43
132" 174" 137.75" 93.59" 59.5" 254.816# 196.824# $4,404.15
138" 180" 143.75" 97.68" 61.98" 264.944# 204.816# $4,575.87
144" 186" 149.75" 101.77" 64.45" 275.072# 245.272# $4,747.59
150" 192" 155.75" 105.62" 66.74" 285.2# 254.2# $4,919.31
156" 198" 161.75" 109.71" 69.21" 295.328# 263.128# $5,091.03
162" 204" 167.75" 113.8" 71.68" 305.456# 272.056# $5,262.75
168" 210" 173.75" 117.89" 73.98" 315.584# 280.984# $5,434.47
174" 216" 179.75" 121.97" 76.45" 325.712# 289.912# $5,606.19
180" 222" 185.75" 125.85" 78.92" 335.84# 298.84# $5,777.91
186" 228" 191.75" 129.94" 81.38" 345.968# 307.768# $5,949.63
192" 234" 197.75" 134.02" 83.7" 356.096# 316.696# $6,121.35
198" 240" 203.75" 138.11" 86.16" 366.224# 325.624# $6,293.07
204" 246" 209.75" 142.19" 88.62" 376.352# 334.552# $6,464.79
210" 252" 215.75" 146.09" 91.08" 386.48# 343.48# $6,636.51
216" 258" 221.75" 150.17" 93.41" 396.608# 352.408# $6,808.23
222" 264" 227.75" 154.25" 95.87" 406.736# 361.336# $6,979.95
228" 270" 233.75" 158.33" 98.33" 416.864# 370.264# $7,151.67
234" 276" 239.75" 162.4" 100.78" 426.992# 379.192# $7,323.39
240" 282" 245.75" 166.32" 103.12" 437.12# 388.12# $7,495.11

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.

Product resources

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# $944.72
30" 72" 33.75" 18.7213" 40.7# $1,071.28
36" 78" 39.75" 21.1453" 44.84# $1,197.71
42" 84" 45.75" 23.5693" 48.98# $1,324.13
48" 90" 51.75" 25.9933" 53.12# $1,450.56
54" 96" 57.75" 28.4173" 57.26# $1,576.98
60" 102" 63.75" 30.8413" 61.4# $1,703.41
66" 108" 69.75" 33.2653" 65.54# $1,829.83
72" 114" 75.75" 35.6893" 69.68# $1,956.26
78" 120" 81.75" 38.1133" 73.82# $2,082.68
84" 126" 87.75" 40.5373" 77.96# $2,209.11
90" 132" 93.75" 42.9613" 82.1# $2,335.53
96" 138" 99.75" 45.3853" 86.24# $2,461.96
102" 144" 105.75" 47.8093" 90.38# $2,588.38
108" 150" 111.75" 50.2333" 94.52# $2,714.81
114" 156" 117.75" 52.6573" 98.66# $2,841.23
120" 162" 123.75" 55.0813" 102.8# $2,967.66
126" 168" 129.75" 57.5053" 106.94# $3,094.08
132" 174" 135.75" 59.9293" 111.08# $3,220.51
138" 180" 141.75" 62.3533" 115.22# $3,346.93
144" 186" 147.75" 64.7773" 119.36# $3,473.36
150" 192" 153.75" 67.2013" 123.5# $3,599.78
156" 198" 159.75" 69.6253" 127.64# $3,726.21
162" 204" 165.75" 72.0493" 131.78# $3,852.63
168" 210" 171.75" 74.4733" 135.92# $3,979.05
174" 216" 177.75" 76.8973" 140.06# $4,105.48
180" 222" 183.75" 79.3213" 144.2# $4,231.90
186" 228" 189.75" 81.7453" 148.34# $4,358.33
192" 234" 195.75" 84.1693" 152.48# $4,484.75
198" 240" 201.75" 86.5933" 156.62# $4,611.18
204" 246" 207.75" 89.0173" 160.76# $4,737.60
210" 252" 213.75" 91.4413" 164.9# $4,864.03
216" 258" 219.75" 93.8653" 169.04# $4,990.45

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

Switchbacks
Crane
Conveyor
Augusta
Mezzanine
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
Choice of color options
  • Safety yellow
  • Iron gray
  • Gray primer
  • Custom RAL colors

Measuring guidelines, sample prints, standard dimensions, connection details, and more.

Product resources

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
STAIR RUN PRICE
56° 68° STANDARD COLORS CUSTOM COLORS
36" 28.93" N/A $941.85 $1,202.35
42" 33.11" 23.08" $1,046.63 $1,315.11
48" 37.25" 25.66" $1,151.41 $1,427.86
54" 41.37" 28.2" $1,256.19 $1,540.61
60" 44.91" 30.28" $1,360.97 $1,653.36
66" 49.07" 32.83" $1,465.75 $1,766.11
72" 53.21" 35.36" $1,570.54 $1,878.87
78" 57.33" 37.86" $1,675.32 $1,991.62
84" 61.44" 40.04" $1,780.10 $2,104.37
90" 65.15" 42.56" $1,884.88 $2,217.12
96" 69.27" 45.05" $1,989.66 $2,329.87
102" 73.39" 47.28" $2,094.44 $2,442.63
108" 77.49" 49.78" $2,199.23 $2,555.38
114" 81.59" 52.27" $2,304.01 $2,668.13
120" 85.38" 54.75" $2,408.79 $2,780.88
126" 89.49" 57.01" $2,513.57 $2,893.63
132" 93.59" 59.5" $2,618.35 $3,006.39
138" 97.68" 61.98" $2,723.13 $3,119.14
144" 101.77" 64.45" $2,827.92 $3,231.89
150" 105.62" 66.74" $2,932.70 $3,344.64
156" 109.71" 69.21" $3,037.48 $3,457.39
162" 113.8" 71.68" $3,142.26 $3,570.15
168" 117.89" 73.98" $3,247.04 $3,682.90
174" 121.97" 76.45" $3,351.82 $3,795.65
180" 125.85" 78.92" $3,456.60 $3,908.40
186" 129.94" 81.38" $3,561.39 $4,021.15
192" 134.02" 83.7" $3,666.17 $4,133.91
198" 138.11" 86.16" $3,770.95 $4,246.66
204" 142.19" 88.62" $3,875.73 $4,359.41
210" 146.09" 91.08" $3,980.51 $4,472.16
216" 150.17" 93.41" $4,085.29 $4,584.91
222" 154.25" 95.87" $4,190.08 $4,697.67
228" 158.33" 98.33" $4,294.86 $4,810.42
234" 162.4" 100.78" $4,399.64 $4,923.17
240" 166.32" 103.12" $4,504.42 $5,035.92

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.

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
STAIR RUN
PRICE
56° 68°
36" 28.93" N/A $1,102.32
42" 33.11" 23.08" $1,224.41
48" 37.25" 25.66" $1,346.49
54" 41.37" 28.2" $1,468.57
60" 44.91" 30.28" $1,590.66
66" 49.07" 32.83" $1,712.74
72" 53.21" 35.36" $1,834.82
78" 57.33" 37.86" $1,956.91
84" 61.44" 40.04" $2,078.99
90" 65.15" 42.56" $2,201.07
96" 69.27" 45.05" $2,323.16
102" 73.39" 47.28" $2,445.24
108" 77.49" 49.78" $2,567.32
114" 81.59" 52.27" $2,689.41
120" 85.38" 54.75" $2,811.49
126" 89.49" 57.01" $2,933.57
132" 93.59" 59.5" $3,055.65
138" 97.68" 61.98" $3,177.74
144" 101.77" 64.45" $3,299.82
150" 105.62" 66.74" $3,421.90
156" 109.71" 69.21" $3,543.99
162" 113.8" 71.68" $3,666.07
168" 117.89" 73.98" $3,788.15
174" 121.97" 76.45" $3,910.24
180" 125.85" 78.92" $4,032.32
186" 129.94" 81.38" $4,154.40
192" 134.02" 83.7" $4,276.49
198" 138.11" 86.16" $4,398.57
204" 142.19" 88.62" $4,520.65
210" 146.09" 91.08" $4,642.74
216" 150.17" 93.41" $4,764.82
222" 154.25" 95.87" $4,886.90
228" 158.33" 98.33" $5,008.99
234" 162.4" 100.78" $5,131.07
240" 166.32" 103.12" $5,253.15

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.

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
STAIR RUN
PRICE
56° 68°
36" 28.93" N/A $1,656.63
42" 33.11" 23.08" $1,828.35
48" 37.25" 25.66" $2,000.07
54" 41.37" 28.2" $2,171.79
60" 44.91" 30.28" $2,343.51
66" 49.07" 32.83" $2,515.23
72" 53.21" 35.36" $2,686.95
78" 57.33" 37.86" $2,858.67
84" 61.44" 40.04" $3,030.39
90" 65.15" 42.56" $3,202.11
96" 69.27" 45.05" $3,373.83
102" 73.39" 47.28" $3,545.55
108" 77.49" 49.78" $3,717.27
114" 81.59" 52.27" $3,888.99
120" 85.38" 54.75" $4,060.71
126" 89.49" 57.01" $4,232.43
132" 93.59" 59.5" $4,404.15
138" 97.68" 61.98" $4,575.87
144" 101.77" 64.45" $4,747.59
150" 105.62" 66.74" $4,919.31
156" 109.71" 69.21" $5,091.03
162" 113.8" 71.68" $5,262.75
168" 117.89" 73.98" $5,434.47
174" 121.97" 76.45" $5,606.19
180" 125.85" 78.92" $5,777.91
186" 129.94" 81.38" $5,949.63
192" 134.02" 83.7" $6,121.35
198" 138.11" 86.16" $6,293.07
204" 142.19" 88.62" $6,464.79
210" 146.09" 91.08" $6,636.51
216" 150.17" 93.41" $6,808.23
222" 154.25" 95.87" $6,979.95
228" 158.33" 98.33" $7,151.67
234" 162.4" 100.78" $7,323.39
240" 166.32" 103.12" $7,495.11

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.

ALTERNATING TREAD STAIRS VERSUS STANDARD STAIRS

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 ATS vs Standard Stair

68° alternating tread stair versus standard stair

68° alternating tread stair versus 56° alternating tread stair

68° alternating tread stair versus 56° alternating tread stair

ALTERNATING TREAD STAIRS VERSUS STANDARD STAIRS

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 ATS vs Standard Stair

68° alternating tread stair versus standard stair

68° alternating tread stair versus 56° alternating tread stair

68° alternating tread stair versus 56° alternating tread stair

Alternating Tread Stairs vs Ship Stairs
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:

Alternating tread stairs
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)

Ship stairs
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)

Alternating Tread Stairs
Alternating tread stairs

Face-forward design

Neutral body posture

Hand contact not required

Stable tread surface

Ladders
Ladders

Device-facing design

Flexed body posture

3-point contact required

Increased fall risk

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

378,400

Number of workplace injuries due to falls from a fixed ladder
SOURCE: Center for Disease Control, 2017

24,800

Number of fixed ladder fall injuries that required hospitalization
SOURCE: Center for Disease Control, 2017

45

Median days missed for injuries due to ladder falls
SOURCE: Bureau of Labor Statistics, 2011-2016

0

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.

12,700

Total MSDs due to ladders (vs. 740 due to stairs)
SOURCE: Bureau of Labor Statistics, 2011-2016

$90,000

Average cost of a MSD-related workers’ compensation claim
SOURCE: Center for Disease Control

12

Median days missed for MSD injuries (vs. 8 for non-MSD injuries)
SOURCE: Bureau of Labor Statistics, 2011-2016

100%

Percent of MSDs that could be prevented
SOURCE: Center for Disease Control

ALTERNATING TREAD STAIRS VERSUS SHIP STAIRS

Alternating Tread Stairs vs Ship Stairs
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%

MORE OVERALL MISSTEPS

129%

MORE MISSTEPS WHEN
DESCENDING WITH A LOAD

Test subjects felt less safe and comfortable on the ship stair 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.

More usable tread depth makes alternating tread stairs safer and more comfortable to use than ship stairs
Alternating tread stairs have more tread depth><figcaption><p class= 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)
Ship stairs have less tread depth><figcaption><p class= 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)

ALTERNATING TREAD STAIRS VERSUS FIXED LADDERS

Alternating Tread Stairs vs Ladders

Alternating tread stairs


Face-forward design

Neutral body posture

Hand contact not required

Stable tread surface

Ladders


Device-facing design

Flexed body posture

3-point contact required

Increased fall risk

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

378,400

Number of workplace injuries due to falls from a fixed ladder
SOURCE: Center for Disease Control, 2017

24,800

Number of fixed ladder fall injuries that required hospitalization
SOURCE: Center for Disease Control, 2017

45

Median days missed for injuries due to ladder falls
SOURCE: Bureau of Labor Statistics, 2011-2016

0

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.

12,700

Total MSDs due to ladders (vs. 740 due to stairs)
SOURCE: Bureau of Labor Statistics, 2011-2016

$90,000

Average cost of a MSD-related workers’ compensation claim
SOURCE: Center for Disease Control

12

Median days missed for MSD injuries (vs. 8 for non-MSD injuries)
SOURCE: Bureau of Labor Statistics, 2011-2016

100%

Percent of MSDs that could be prevented
SOURCE: Center for Disease Control

Ready to take the next step?

Contact us