Load duration factors adjust the allowable stresses according to the amount of time a load is fully applied to a member. The less time the load is fully applied, the higher the duration factor.
Note: In the US, duration factors are represented as percentages (like 100%) whereas in the UK they are not (like 1.0).
Duration values used by BC FRAMER:
- Dead (90%)
- Live (100%)
- Roof Live (125%)
- Snow (100% or 115%)
- Wind (133% or 160%)
Please consult your local building code official for the correct load duration values in your area.