Ibc Minimum Flat Roof Slope

And 4 12 minimum roof slope for slate and wood shakes.

Ibc minimum flat roof slope.

For roof slopes from two units vertical in 12 units horizontal 17 percent slope up to four units vertical in 12 units horizontal 33 percent slope double underlayment application is required in accordance with section 1507 2 8. 2 exactly does not translate to 1 4 per foot. This logic does not consider that lower sloped roofs will not drain water at the same rate as roofs with greater slopes. I understand this is more of rounding off to get to a nice number.

For steep slope roof systems ibc 2018 provides for a 1 12 minimum roof slope for mineral surfaced roof roll roofing. 2 12 minimum roof slope for asphalt shingles photovoltaic pv shingles and building integrated pv. The ibc table 1505 1 lists the minimum requirements for roof covering fire resistance classifications a b or c for all types of. Per foot would be acceptable.

The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. When required testing is in accordance with astm e108 or ul 790. This means that even less than the minimum of in. 3 12 minimum roof slope for metal roof panels with nonsoldered seams without applied lap sealant metal shingles and wood shingles.

I am looking at the ibc minimum roof slope requirement for standing seam metal roof. The minimum slope the code allows is in 12 in. Minimum roof fire resistance ratings apply based on the type of construction and some building types do not require a fire rating. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.