Roof Slope Section

So the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally.

Roof slope section.

Roof pitch multiplier table. Roof slope or pitch rise run area and other features. When required for steep slope roofs section 1507 in the ibc and section r905 1 2 of the irc specify the use of an ice barrier that consists of either two layers of underlayment cemented together or a self adhering polymer modified bitumen sheet at eaves and valleys. Here we describe various methods for measuring all roof data.

Roof covering materials provide weather protection and chapter 9 regulates the minimum required slope for each type of roof covering material since part of the performance of a roof covering material is based on the slope of the roof surface. We include on roof measurements roof measurements or estimates that can be made from ground level and several neat tricks using a folding ruler to measure roof angle or slope. In the us the slope of the roof is typically expressed as a ratio rise in run or rise run which by general agreement in the us roofing industry always uses 12 inches as the run and states how many inches the roof rises vertically for every 12 inches the roof goes across horizontally sloped roofs commonly have slopes like 6 in 12 6 12 or 8 12. Roof slope equivalents as rise.

This article shows how simple measurements can give the roof area. Run in degrees and as percentage the minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. These assemblies have temperature ratings that vary for different roof coverings.