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.

Minimum flat roof slope ibc.

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. 3 12 minimum roof slope for metal roof panels with nonsoldered seams without applied lap sealant metal shingles and wood shingles. The minimum roof slope for metal roof panels depend on 3 different scenarios. 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.

I am looking at the ibc minimum roof slope requirement for standing seam metal roof. Ibc callouts for min 2 or 1 4 per foot. 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. The ibc minimum required roof slope is 1 4 in 12 which is about 1 2 degrees for a membrane roof.

2 exactly does not translate to 1 4 per foot. The ibc allows non classified roof coverings to be used on residential group r 3 see ibc section 310 5 and group u see ibc section 312 buildings such as agricultural buildings barns carports if the separation between the leading edges of the adjacent roofs is less than 6 feet unless otherwise required by local requirements such as the international wildland urban interface code. This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. So typically we follow 2 slope is that meeting the code even if the slope is slight shy of 1 4 per foot.

The code may still have a provision for hot mopped asphalt but i cannot see this being used in the middle east. This is the basis for calculating the angle which is approximately a 1 19 degree slope. 2 12 minimum roof slope for asphalt shingles photovoltaic pv shingles and building integrated pv. 2 1 2 12 minimum roof slope for clay and concrete tile.

Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope. What kind of rain fall rates are you looking at. I understand this is more of rounding off to get to a nice number. The minimum roof slope allowed by code for any type of roofis in 12 applicable only to coal tar pitch roof systems.

For steep slope roof systems ibc 2018 provides for a 1 12 minimum roof slope for mineral surfaced roof roll roofing. If you are using a metal panel roof then you may need to go steeper. The following tableprovides the minimum required allowable roof slope for each type of roofing material mentioned in the code. And 4 12 minimum roof slope for slate and wood shakes.

Minimum slope for asphalt shingles the requirements for an asphalt shingles roof are contained in the international building code.