Sloped Roof Roof Snow Load Map

1610 8 snow pockets or wells.

Sloped roof roof snow load map.

0 7 x pg ground snow load pf roof snow load roof snow load examples. The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load. 60 ground snow psf below line 50 psf 50 ground snow psf. Values of c s for warm roofs and cold roofs are as.

The flat roof snow load is calculated using formula 7 3 1. Superpose the drift load on the base snow load. 7 4 1 7 4 4 and asce figure 7 2 below. 20 ft of the roof multiply the drift load by the factor.

7 2b with a c s 1 0 p f flat roof snow load in psf. Check for loads due to snow sliding from an upper roof. Account shall be taken of the load effects of potentially excessive snow accumulation in pockets or wells of roofs or decks. See section 7 9 asce 7.

All snow loads acting on a sloping surface shall be considered to act on the horizontal projection of that surface. 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. 0 7 x 60 psf 42 psf below line.

On the low roof if proper snow guards are provided on the high roof. Psf pounds per square foot above line 60 psf. Residential roof with asphalt wood shingles or shakes would use fig. To calculate roof snow load per residential building code.

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. P s cspf equation 68 5 3. The slope roof snow load p s shall be obtained by multiplying the flat roof snow load pf by the roof slope factor cs. In this case the sloping roof with snow guards shall be designed for the unit snow loads required for a flat roof.

Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10. Snow loads for structural design in montana revised 2004 gregory p. In our case let s assume that our structure has a flat roof roof slope 5. 20 s 20 where s is the spacing in feet.

See section 7 4 5 asce 7. 0 7 x 50 psf 35 psf. Calculate sloped roof snow load p s using the following equation. Done calculate drift surcharge load.

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.