Sloped Roof Roof Snow Load Map

On the low roof if proper snow guards are provided on the high roof.

Sloped roof roof snow load map.

P s c s p f where. Values of c s for warm roofs and cold roofs are as. 7 2b with a c s 1 0 p f flat roof snow load in psf. Snow loads for structural design in montana revised 2004 gregory p.

P s cspf equation 68 5 3. 0 7 x pg ground snow load pf roof snow load roof snow load examples. 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.

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. The slope roof snow load p s shall be obtained by multiplying the flat roof snow load pf by the roof slope factor cs. Done calculate drift surcharge load. B sloped roof snow loads ps.

Superpose the drift load on the base snow load. Check for loads due to snow sliding from an upper roof. Residential roof with asphalt wood shingles or shakes would use fig. See section 7 4 5 asce 7.

The flat roof snow load is calculated using formula 7 3 1. 60 ground snow psf below line 50 psf 50 ground snow psf. 1610 8 snow pockets or wells. In this case the sloping roof with snow guards shall be designed for the unit snow loads required for a flat roof.

P s sloped roof snow load in psf c s roof slope factor as determined by asce sec. 7 4 1 7 4 4 and asce figure 7 2 below. See section 7 9 asce 7. In our case let s assume that our structure has a flat roof roof slope 5.

To calculate roof snow load per residential building code. Check for ice dams and icicle loads. All snow loads acting on a sloping surface shall be considered to act on the horizontal projection of that surface. Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10.

Psf pounds per square foot above line 60 psf. The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load. 20 s 20 where s is the spacing in feet. Calculate sloped roof snow load p s using the following equation.

20 ft of the roof multiply the drift load by the factor.