Sloped Roof Roof Snow Load Map

20 s 20 where s is the spacing in feet.

Sloped roof roof snow load map.

Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10. 60 ground snow psf below line 50 psf 50 ground snow psf. Check for ice dams and icicle loads. Residential roof with asphalt wood shingles or shakes would use fig.

The flat roof snow load is calculated using formula 7 3 1. 0 7 x pg ground snow load pf roof snow load roof snow load examples. In this case the sloping roof with snow guards shall be designed for the unit snow loads required for a flat roof. 0 7 x 50 psf 35 psf.

Superpose the drift load on the base snow load. All snow loads acting on a sloping surface shall be considered to act on the horizontal projection of that surface. B sloped roof snow loads ps. See section 7 9 asce 7.

1610 8 snow pockets or wells. On the low roof if proper snow guards are provided on the high roof. Account shall be taken of the load effects of potentially excessive snow accumulation in pockets or wells of roofs or decks. Snow loads for structural design in montana revised 2004 gregory p.

Calculate sloped roof snow load p s using the following equation. To calculate roof snow load per residential building code. 20 ft of the roof multiply the drift load by the factor. The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load.

Done calculate drift surcharge load. See section 7 4 5 asce 7. 7 2b with a c s 1 0 p f flat roof snow load in psf. Values of c s for warm roofs and cold roofs are as.

7 4 1 7 4 4 and asce figure 7 2 below. In our case let s assume that our structure has a flat roof roof slope 5. Psf pounds per square foot above line 60 psf. P s c s p f where.

P s sloped roof snow load in psf c s roof slope factor as determined by asce sec. P s cspf equation 68 5 3. P s c s p f the thermal factor c t from table e 3 determines if a roof is cold or warm slippery surface values shall be used only where the roof s surface is unobstructed and sufficient space is. 0 7 x 60 psf 42 psf below line.

If you live in the us our snow load calculator compares the total weight on your roof with the permissible load calculated according to the standards issued by the american society of civil engineers regarding the minimum design loads for buildings and other structures asce7 16.