10 In 12 Roof Slope

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

10 in 12 roof slope.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Simply put it s a shallow roof. Roof pitch is a term describing how steep or flat your roof slope is. You can assess this in two ways either as the roof pitch angles which the rafters make with the.

How do you calculate a roof pitch. Roof pitch refers to the slope which the rafter creates. 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. Built up roofs should be installed on roof slopes 0 25 12 or greater 2015 irc r905 9 1 except for coal tar built up roofs that have a minimum roof slope of one eighth unit vertical in 12 units horizontal 1 slope.

Drag sliders to animate the results and diagram. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. Minimum roof slope of. The combination of two numbers are used to display or show the roof pitch.

The triangle diagram will be re drawn to scale with all dimensions marked. Most roof s have a pitch in the 4 12 to 9 12 range. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. After entering all of the values the roof pitch calculator automatically gives you the values of the roof pitch roof pitch and roof pitch x 12.

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. For example if you measure 4 inches the pitch of your roof is 4 12. Asphalt shingles minimum roof slope roof pitch r905 2 2. A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance.

The minimum roof pitch for shedding snow is around 30 or a 6 12 or 7 12 slope although this is not a definite as the material of your roof the direction of the snow and wind are some factors that can affect whether or not snow will slide as roofs of as little as 10 have been reported to shed snow. This will give you the rise over run or 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. 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.

Asphalt shingles can only be installed on roof slopes of 2 12 or greater.