Montana ground snow load finder.
Montana roof pitch.
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.
The state of montana requires a minimum roof snow load of 30 psf be used for design 2 this minimum value applies to the final roof snow load that is calculated after all coefficients have been applied and it may be revised when justified by a design professional to the satisfaction of the building official.
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Pitches above 9 12 are very highly angled and are designated steep slope roofs.
Roof flashing shall be not less than no.
With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 200 for slate roofs.
It is recommended that latitude and longitude be input.
Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs.
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.
Lower slopes don t handle wind driven rain as well.
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.
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.
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.
Steeper slopes increase the sail effect that makes them susceptible to wind.
Ground snow load is highly sensitive to geographic location elevation.
The most commonly used roof pitches fall in a range between 4 12 and 9 12.
44 25 to 48 95 degrees.
Note that the state of montana requires a minimum roof snow load of 30 psf be used for design.
A 30 degree roof slope 7 12 pitch is the right pitch to aerodynamically handle high wind.
Snow loads shall be determined by the building official.
Sections of flashing shall have an end lap of not less than 4 inches 102 mm.
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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.
Pursuant to montana law the minimum design roof snow load after allowed reductions shall be 30 psf.
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.
