Flat Roofs And Snow Load

Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10.

Flat roofs and snow load. Employing a combination of steel and wood on this connector roof the architects engineered the roof to support sustained snow loads while capably protecting the walkway below from snow accumulation. Check out this website. If your drainage system isn t functioning well it can cause water to pool on the top of the roof. One of them is that flat roofs leak more easily than pitched ones.

The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load. Another is that they cannot handle as much snow weight as pitched roofs because the snow sits directly on the roof. Structural engineers association of oregon. But in flat roofed homes they re extra important.

Step 4 determine the flat roof snow load. Flat roof snow loads p f. For roofs that are flat and with ground snow loads lower than 20 pounds per square foot the roof snow load is equal to 70 of the product of the exposure thermal and importance factors and the ground snow load. Neither of these are accurate.

The flat usonian roofs are designed to hold 25 psf pounds per square foot of snow which is a live load meaning the snow load isn t going to be there permanently. They help with roof snow removal and rainfall by funneling it away from your roof and siding. There are a few common misconceptions regarding flat roofs that are stubbornly persistent. But in flat roofed homes they re extra important.

For ground snow loads greater than 20 pounds per square foot the roof load is equal to 70 of the product of the exposure thermal and importance factors the ground snow load and 20 pounds. Want to find out more about snow loads around oregon. In regions with relatively low snow load values the load from a single event may result in the peak loading. Asce 7 05 equation 7 1 assumes that the snow load results from multiple events.

Minimum flat roof snow load values.