- Stairs
- Constructed using three 2×12 stringers notched at 7 3/4″ rise and 10″ run. Stringers to rest on pressure treated plate and secured to double header at topplate.
- Treads constructed using two 2x6s secured with glue and either ring-shank nails, screw-shank nails, or deck screws
- Ensure 1 1/2″ space between stairwell walls and stringers/treads/risers
- Tread nosing of 1/2″ to 1″ required. Ensure top step (at 2nd floor subfloor) has nosing, i.e., no ledger board/furring strip.
- Landings to be constructed using floor joist framing rules (i.e., no ledger boards). A layer of 23/32 CDX plywood to serve as landing surface.
- Framed half-walls at top of stairs shall incorporate a square column from floor to ceiling.
- Note: Two 2x4s with spacer made of 7/16″ OSB sandwiched between.
- Fall Protection Requirements
- Required when soles of worker’s feet are above 6 feet
- Guardrails are required at 2nd floor exterior wall studs when the stud spacing is greater than 18″ O.C.
- 2nd floor framed window openings require 2×4 barriers secured parallel with subfloor at 39″+(-) 3″
- Handrails required up side of stairwells
- Safety railing system at landings and open areas above 6 feet. A 42″ top rail, midrail, & 4″ toeboard attached to support posts (mounted in SafetyBoots) spaced at 8′ O.C. Must resist 200 lbs lateral force. Refer to manufacturers installation guide to install Safety Boots.
- Subflooring
- Check material condition of subfloor in each room. Check for level. Humps, dips, holes, soft areas, and significant weather damage require corrective action.
- All subfloor panels to be secured with glue and either ring-shank nails, or deck screws. Material must be installed with a 1/8″ gap between 4×8 sheets.
- Fastener schedule: 6″ O.C., every floor joist
- Unsupported subfloor joints (saw cut without tongue-in-groove reinforcement) perpendicular to joists shall be supported with solid blocking.
