Technical resources for commercial egress stairs

Standard product details STANDARD PRODUCT DETAILS

Typical details for our commercial egress stairs with standard product options.

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Standard stringer and rail design
48" maximum distance between posts
7" maximum riser height
11" tread depth
A ¼" Closure Plates
B Dewalt Power Stud
C For Landing Connection
D Handrail (1½ OD 13 ga tube)
E Top Rail (1½ OD 13 ga tube or 1¼ sched 40 pipe)
F ⅝" Handrail Bracket
G Knee Rail (1½ OD 13 ga tube or 1¼ sched 40 pipe)
H Top Grab Rail (either continuous to next flight or 12" horizontal extension)
I Post (1½ OD 13 ga tube or 1¼ sched 40 pipe)
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Standard rail design
12" hand rail extension length
12" hand rail extension height
3¼" knee rail to stringer
1½" top of stringer to top of tread
1½" bottom post to bottom edge of stringer
1¾" top post to top edge of stringer
36" handrail height
42" guard rail height
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Round pipe rail frame, picket infill
48" maximum distance between posts
Variable slope (determined by code)
4" sphere maximum opening
¼" fillet weld
42" top rail height
A 1½ OD 13 ga tube rail frame
B ¼" to ½" square or round picket infill
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Square tube rail frame, picket infill
48" maximum distance between posts
Variable slope (determined by code)
4" sphere maximum opening
¼" fillet weld
42" top rail height
A 1¼" schedule 40 pipe rail frame
B ¼" to ½" square or round picket infill
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Multi-line infill 7-LINE, EQUALLY SPACED
48" maximum distance between posts
Variable slope (determined by code)
4" sphere maximum opening
¼" fillet weld
42" top rail height
A 1.66" OD x .140 round tube rail frame and infill
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Mesh panel infill WELDED TO THE RAIL FRAME
48" maximum distance between posts
Variable slope (determined by code)
4" sphere maximum opening
¼" fillet weld
42" top rail height
A 1½ OD 13 ga tube rail frame
B 2" #6 wire mesh with 1" u-channel frame panel infill
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Concrete pan treads
1" tread overlap
11" tread depth
1½" from top of tread to top of stringer
1½" thick tread
7" max tread height
⅛" fillet weld; 1½" long
A Formed sheet steel treads and risers at specified thickness
B 1½" site-filled concrete (not provided by Lapeyre Stair)

Wire mesh is not required for concrete with a minimum strength of 4,000 PSI. Wire mesh (if required) is not provided by Lapeyre Stair. Standard design does not include provisions for loose, field-poured nosings. If nosing provisions are required, they must be specified; these nosings are not provided by Lapeyre Stair.

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Diamond plate treads
1" tread overlap
11" tread depth
1½" from top of tread to top of stringer
7" max tread height
⅛" fillet weld; 1½" long
A Formed diamond plate treads and risers at specified thickness
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Bar grate treads 10W4 or 19W4
12⅛" tread depth (including tread overlap)
1¼" nosing
10½" bar grate surface depth
1⅝" nosing
10⅞" bar grate surface depth
Variable tread width (as specified)
A Extended surface when closed risers are specified
B 3/16" standard bar width; 1 or 1½" bar depth (as specified)
C Choice of smooth or serated grating


Standard connection details STANDARD CONNECTION DETAILS

Typical details for common types connections for installing our commercial egress stairs.

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Stair to slab connection
¼" fillet weld
11/16"
Variable based on specifications
A Concrete slab
B Channel stringer (MC 12X10.6)
C DeWalt Power-Stud SD1 (¾"X5½")
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Landing connection
½" parallel minimum clearance
A ¼" gusset
B Leg angle (L3X3X¼)
C DeWalt Power-Stud
D Concrete or CMU (customer-filled at landings)
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Hanger rod landing supports
¼" fillet weld
¼" flare bevel weld (both sides)
½" parallel
¼" fillet weld (tack weld)
A ½" steel plate (embed)
B Nelson S3L bolt (¾")
C Leg angle (L6X4X⅜)
D Hanger rod (¾" or 1" diameter)
E Stud wall
F Extended header
G Leg angle (L3X3X¼)
H ⅛" steel plate
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Shelf angle landing supports
½" parallel
¼" fillet weld (both sides)
A Concrete or CMU (customer-filled at landings)
B Channel stringer (MC 12X10.6)
C ¼" gusset plate
D Leg angle (L6X4X⅜)
E DeWalt Power-Stud
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Direct bolt through landing supports
½" parallel maximum clearance
A Concrete or CMU (customer-filled at landings)
B Leg angle (L3X3X¼)
C DeWalt Power-Stud

No shelf angles; the landing is anchored directly to the wall through the side body.

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Column landing supports
½" parallel
¼" fillet weld
A Stud wall
B ⅛" steel plate
C Extended header
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