Dimensions and Measurements for commercial egress stairs
Standard product details STANDARD PRODUCT DETAILS
Typical details for our commercial egress stairs with standard product options.
Standard stringer and rail design
| ❶ | 48" maximum distance between posts |
| ❷ | 7" maximum riser height |
| ❸ | 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) |
Standard rail design
| ❶ | 12" hand rail extension length |
| ❷ | 12" hand rail extension height |
| ❸ | 3¼" knee rail to stringer |
| ❹ | 1½" top of stringer to top of tread |
| ❺ | 1½" bottom post to bottom edge of stringer |
| ❻ | 1¾" top post to top edge of stringer |
| ❼ | 36" handrail height |
| ❽ | 42" guard rail height |
Round pipe rail frame, picket infill
| ❶ | 48" maximum distance between posts |
| ❷ | Variable slope (determined by code) |
| ❸ | 4" sphere maximum opening |
| ❹ | ¼" fillet weld |
| ❺ | 42" top rail height |
| A | 1½ OD 13 ga tube rail frame |
| B | ¼" to ½" square or round picket infill |
Square tube rail frame, picket infill
| ❶ | 48" maximum distance between posts |
| ❷ | Variable slope (determined by code) |
| ❸ | 4" sphere maximum opening |
| ❹ | ¼" fillet weld |
| ❺ | 42" top rail height |
| A | 1¼" schedule 40 pipe rail frame |
| B | ¼" to ½" square or round picket infill |
Multi-line infill 7-LINE, EQUALLY SPACED
| ❶ | 48" maximum distance between posts |
| ❷ | Variable slope (determined by code) |
| ❸ | 4" sphere maximum opening |
| ❹ | ¼" fillet weld |
| ❺ | 42" top rail height |
| A | 1.66" OD x .140 round tube rail frame and infill |
Mesh panel infill WELDED TO THE RAIL FRAME
| ❶ | 48" maximum distance between posts |
| ❷ | Variable slope (determined by code) |
| ❸ | 4" sphere maximum opening |
| ❹ | ¼" fillet weld |
| ❺ | 42" top rail height |
| A | 1½ OD 13 ga tube rail frame |
| B | 2" #6 wire mesh with 1" u-channel frame panel infill |
Concrete pan treads
| ❶ | 1" tread overlap |
| ❷ | 11" tread depth |
| ❸ | 1½" from top of tread to top of stringer |
| ❹ | 1½" thick tread |
| ❺ | 7" max tread height |
| ❻ | 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. |
|
Diamond plate treads
| ❶ | 1" tread overlap |
| ❷ | 11" tread depth |
| ❸ | 1½" from top of tread to top of stringer |
| ❹ | 7" max tread height |
| ❺ | ⅛" fillet weld; 1½" long |
| A | Formed diamond plate treads and risers at specified thickness |
Bar grate treads 10W4 or 19W4
| ❶ | 12⅛" tread depth (including tread overlap) |
| ❷ | 1¼" nosing |
| ❸ | 10½" bar grate surface depth |
| ❹ | 1⅝" nosing |
| ❺ | 10⅞" bar grate surface depth |
| ❻ | 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.
Stair to slab connection
| ❶ | ¼" fillet weld |
| ❷ | 11/16" |
| ❸ | Variable based on specifications |
| A | Concrete slab |
| B | Channel stringer (MC 12X10.6) |
| C | DeWalt Power-Stud SD1 (¾"X5½") |
Landing connection
| ❶ | ½" parallel minimum clearance |
| A | ¼" gusset |
| B | Leg angle (L3X3X¼) |
| C | DeWalt Power-Stud |
| D | Concrete or CMU (customer-filled at landings) |
Hanger rod landing supports
| ❶ | ¼" fillet weld |
| ❷ | ¼" flare bevel weld (both sides) |
| ❸ | ½" parallel |
| ❹ | 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 |
Shelf angle landing supports
| ❶ | ½" parallel |
| ❷ | 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 |
Direct bolt through landing supports
| ❶ | 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. |
|
Column landing supports
| ❶ | ½" parallel |
| ❷ | ¼" fillet weld |
| A | Stud wall |
| B | ⅛" steel plate |
| C | Extended header |