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