Sloped Roof Roof Snow Load Map

The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load.

Sloped roof roof snow load map.

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. P s cspf equation 68 5 3. On the low roof if proper snow guards are provided on the high roof. 7 2b with a c s 1 0 p f flat roof snow load in psf.

Calculate sloped roof snow load p s using the following equation. Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10. To calculate roof snow load per residential building code. 7 4 1 7 4 4 and asce figure 7 2 below.

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. 20 ft of the roof multiply the drift load by the factor. 1610 8 snow pockets or wells.

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. Done calculate drift surcharge load. Values of c s for warm roofs and cold roofs are as. See section 7 4 5 asce 7.

60 ground snow psf below line 50 psf 50 ground snow psf. In our case let s assume that our structure has a flat roof roof slope 5. In this case the sloping roof with snow guards shall be designed for the unit snow loads required for a flat roof. Superpose the drift load on the base snow load.

Residential roof with asphalt wood shingles or shakes would use fig. Check for loads due to snow sliding from an upper roof. All snow loads acting on a sloping surface shall be considered to act on the horizontal projection of that surface. The flat roof snow load is calculated using formula 7 3 1.

20 s 20 where s is the spacing in feet. Snow loads for structural design in montana revised 2004 gregory p. 0 7 x 50 psf 35 psf. P s sloped roof snow load in psf c s roof slope factor as determined by asce sec.

Psf pounds per square foot above line 60 psf. The sloped roof snow load p s shall be obtained by multiplying the flat roof snow load p f by the roof slope factor c s. 0 7 x 60 psf 42 psf below line. B sloped roof snow loads ps.

The slope roof snow load p s shall be obtained by multiplying the flat roof snow load pf by the roof slope factor cs.