Wind exposure of roof.
Roof angle for snow.
In general determining the pitch of an existing roof is a simple calculation.
Again the most important consideration is the weather.
There are advantages and disadvantages to having a steep pitch versus a shallow or low pitch the most obvious of which is the roof s ability to shed or withstand heavy snow rain or wind.
Ground snow load value.
On multiple factors including.
Steeper slopes are ideal for areas that have higher snow loads and will also prevent the possibility of ponding water on the roof.
It is determined based.
Importance of a roof pitch.
The minimum roof pitch is also subject to the standards set forth by the various building codes used in the respective regions.
Use a handy tool like snow load calculator to help you determine if your roof can handle the weight of snow based on its pitch.
Basically the steeper the pitch the better it can shed snow and rain.
The flip side to this is that it also becomes more expensive to build both in.
These are also the most common pitches for shed roofs.
In the roofing trade the go to term is pitch and it is expressed in terms of 12 inches so the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally.
Roof snow load is defined as the weight of snow on the roof surface used in design of the building structure ibc 2012.
Any roof from 4 12 to 9 12 is considered an ordinary angle for a roof.
The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
Importance occupancy and use of the building.
Pitch angle incline slope they all can be used to refer to the steepness of a roof.
This can be accomplished by measuring the number of inches the roof rises vertically for every 12 inches it extends horizontally.
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.
A steep slope roof is one whose slope is greater than 3 12.
The chief reason for having a roof pitch is to redirect water and snow away from the roof and avoid any percolation that might result from stagnation of water on the roof.
