R905.2.2

Section R905.2.2 is titled 'Slope' and limits the use of asphalt shingles to roofs with a slope of 2/12 or greater, as well as requiring double underlayment for 2/12 up to 4/12 slopes. The section also cross references another code section for details pertaining to the underlayment.

The model shows a section of roof framing and sheathing changing from flat to a 12/12 slope. The display above the roof section, in correlation with the slope changes, indicates when asphalt shingles may and may not be used.