Roof Live Load Duration Factor

Load duration factors allows us to increase the load carrying capacity of wood based on how long a load is expected to act on a structure the shorter the period of time the higher the allowed increase. Hopefully you like me want your beautiful new building to structurally withstand what nature throws at it. Greater than 10 years 0 9 permanent 10 years 1 0 normal floor ll 1 year 1 075 long term temporary load 2 months 1 15 snow load 7 days 1 25 roof live load 10 minutes 1 6 wind or seismic load less than 2 seconds 2 0 impact load e g.

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