To calculate roof snow load per residential building code.
Sloped roof roof snow load map.
Psf pounds per square foot above line 60 psf.
20 ft of the roof multiply the drift load by the factor.
7 4 1 7 4 4 and asce figure 7 2 below.
Done calculate drift surcharge load.
Residential roof with asphalt wood shingles or shakes would use fig.
Calculate sloped roof snow load p s using the following equation.
0 7 x 60 psf 42 psf below line.
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.
60 ground snow psf below line 50 psf 50 ground snow psf.
P s sloped roof snow load in psf c s roof slope factor as determined by asce sec.
1610 8 snow pockets or wells.
See section 7 4 5 asce 7.
The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load.
Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10.
7 2b with a c s 1 0 p f flat roof snow load in psf.
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.
See section 7 9 asce 7.
Check for ice dams and icicle loads.
20 s 20 where s is the spacing in feet.
0 7 x pg ground snow load pf roof snow load roof snow load examples.
All snow loads acting on a sloping surface shall be considered to act on the horizontal projection of that surface.
In our case let s assume that our structure has a flat roof roof slope 5.
P s cspf equation 68 5 3.
In this case the sloping roof with snow guards shall be designed for the unit snow loads required for a flat roof.
On the low roof if proper snow guards are provided on the high roof.
P s c s p f where.
The slope roof snow load p s shall be obtained by multiplying the flat roof snow load pf by the roof slope factor cs.
Snow loads for structural design in montana revised 2004 gregory p.
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 50 psf 35 psf.
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.
