Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled.
Montana roof pitch.
Note that the state of montana requires a minimum roof snow load of 30 psf be used for design.
It is recommended that latitude and longitude be input.
The most commonly used roof pitches fall in a range between 4 12 and 9 12.
Apply a 19 inch strip of underlayment felt on top of the ice barrier parallel to and starting at the eaves fastened sufficiently to hold in place.
Ground snow load is highly sensitive to geographic location elevation.
On top of the 19 inch strip of underlayment felt.
Snow loads shall be determined by the building official.
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26 gage 0 019 inches 0 5 mm corrosion resistant sheet metal and shall extend 10 inches 254 mm from the centerline each way for roofs having slopes less than 12 units vertical in 12 units horizontal 100 percent slope and 7 inches 178 mm from the centerline each way for slopes of 12 units vertical in 12 units horizontal and greater.
With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 200 for slate roofs.
Pursuant to montana law the minimum design roof snow load after allowed reductions shall be 30 psf.
Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs.
On the roof hold the level perfectly level and measure the height from the roof to the level 12 inches away from where the level touches the surface this will be the rise.
Pitches above 9 12 are very highly angled and are designated steep slope roofs.
Sections of flashing shall have an end lap of not less than 4 inches 102 mm.
In areas of the state outside of certified city county and town jurisdictions the design snow load shall be based on the ground snow loads developed in snow loads for structural design.
Roofs between 2 12 to 4 12 pitch can use standard asphalt shingles but must have two layers of underlayment installed in the following manner.
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For example if the level is 4 above the roof at a point 12 away from where the level is touching the surface then the pitch is 4 12.
Steeper slopes increase the sail effect that makes them susceptible to wind.
44 25 to 48 95 degrees.
A 30 degree roof slope 7 12 pitch is the right pitch to aerodynamically handle high wind.
Montana ground snow load finder.
But since there is still a wide variety of slate roofing systems there are occasions when the minimum pitch can go down to as low as 15 0 depending on the uniqueness of the roof.
Lower slopes don t handle wind driven rain as well.
