Sloped Roof Roof Snow Load Map

0 7 x 50 psf 35 psf.

Sloped roof roof snow load map. See section 7 4 5 asce 7. 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. 20 ft of the roof multiply the drift load by the factor. B sloped roof snow loads ps.

Done calculate drift surcharge load. See section 7 9 asce 7. 20 s 20 where s is the spacing in feet. The flat roof snow load is calculated using formula 7 3 1.

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 our case let s assume that our structure has a flat roof roof slope 5. To calculate roof snow load per residential building code. 7 2b with a c s 1 0 p f flat roof snow load in psf.

Check for ice dams and icicle loads. 7 4 1 7 4 4 and asce figure 7 2 below. 0 7 x 60 psf 42 psf below line. P s c s p f where.

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. 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. 1610 8 snow pockets or wells.

Psf pounds per square foot above line 60 psf. Check for loads due to snow sliding from an upper roof. On the low roof if proper snow guards are provided on the high roof. Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10.

The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load. 0 7 x pg ground snow load pf roof snow load roof snow load examples. Snow loads for structural design in montana revised 2004 gregory p. 60 ground snow psf below line 50 psf 50 ground snow psf.

Values of c s for warm roofs and cold roofs are as. Residential roof with asphalt wood shingles or shakes would use fig. All snow loads acting on a sloping surface shall be considered to act on the horizontal projection of that surface. Account shall be taken of the load effects of potentially excessive snow accumulation in pockets or wells of roofs or decks.

Calculate sloped roof snow load p s using the following equation.