3 4 12 Metal Roof Slope

The table below shows common roof pitches and the equivalent grade degrees and radians for each.

3 4 12 metal roof slope. This means for every 12 horizontal units the roof must rise a minimum of one half vertical unit. Corrugated metal roofing has the same minimum pitch. Typically large footprint single story. Even though manufacturers say 1 4 12 is acceptable.

Most roof s have a pitch in the 4 12 to 9 12 range. Simply put it s a shallow roof. The pitch is measured in inches of vertical rise per foot of horizontal run and the 5v crimp profile shown above requires a minimum slope of three in twelve or 3 12 3 inches vertically per 12 inches horizontally. A low slope roof is one whose slope is less than 3 12.

Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. For example if you measure 4 inches the pitch of your roof is 4 12. The most common slopes are. Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter.

That said if you want to have a metal roof that is worth its weight in value that doesn t come with a ton of problems the minimum pitch for metal roof applications should be kept at around at least a 3 1 2 12 three and a half on 12 or above. If a roof rises 3 in a length of 12 this is 3 12 roof pitch. Minimum metal roof slope depends on the roof profile building design climate and site location. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope.

Low slope or steep slope commercial application. Image 1 12 to 12 12 roof pitch 7 12 pitch. A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof. That means the roof doesn t shed water as easily as steeper roofs which is why choosing the right type of roofing material is so important.

3 12 1 2 12 and 1 4 12. If this isn t practical then perform the same measurement on the underside of the roof. 3 12 roof pitch angle 14 04 degrees. This will give you the rise over run or pitch.

We included a roof pitch chart below the 7 12 example image and the calculator below that. A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance.