Wash. Admin. Code § 296-150C-0920
When a structural assembly is subjected to total design live loads, the deflection for structural framing members must not exceed the following:
L = The clear span between supports or two times the length of a cantilever.
| Floor | L/240 |
| Roof and ceiling | L/180 |
| Headers, beams, girders | L/180 |
| Walls and partitions | L/180 |
[Statutory Authority: RCW 43.22.340, [43.22.]355, [43.22.]360, [43.22.]432, [43.22.]440 and [43.22.]480. WSR 96-21-146, § 296-150C-0920, filed 10/23/96, effective 11/25/96.]