Minimum Flat Roof Slope Ibc

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.

Minimum flat roof slope ibc.

Flat roof slope minimum according to the international building code the typical built up flat roof that uses tar or asphalt goes by the guideline that for every foot 12 inches of a flat roof a minimum of inch must step up or down. The minimum slope for standing seam metal roof panel systems shall be one quarter unit vertical in 12 units horizontal 2 percent slope. I am looking at the ibc minimum roof slope requirement for standing seam metal roof. The minimum roof slope for metal roof panels depend on 3 different scenarios.

3 12 minimum roof slope for metal roof panels with nonsoldered seams without applied lap sealant metal shingles and wood shingles. Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. 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.

2 exactly does not translate to 1 4 per foot. If you are using a metal panel roof then you may need to go steeper. 2 12 minimum roof slope for asphalt shingles photovoltaic pv shingles and building integrated pv. This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units.

The minimum slope for lapped nonsoldered seam metal roof panels with applied lap sealant shall be one half unit vertical in 12 units horizontal 4 percent slope. 2 1 2 12 minimum roof slope for clay and concrete tile. So typically we follow 2 slope is that meeting the code even if the slope is slight shy of 1 4 per foot. Ibc callouts for min 2 or 1 4 per foot.

The minimum roof slope allowed by code for any type of roofis in 12 applicable only to coal tar pitch roof systems. I understand this is more of rounding off to get to a nice number. This is the basis for calculating the angle which is approximately a 1 19 degree slope. The ibc minimum required roof slope is 1 4 in 12 which is about 1 2 degrees for a membrane roof.

Minimum slope for asphalt shingles the requirements for an asphalt shingles roof are contained in the international building code. Lap sealants shall be applied in accordance with the approved manufacturer s installation instructions. And 4 12 minimum roof slope for slate and wood shakes. The code may still have a provision for hot mopped asphalt but i cannot see this being used in the middle east.

The following tableprovides the minimum required allowable roof slope for each type of roofing material mentioned in the code.