Minimum Flat Roof Slope Ibc

The ibc minimum required roof slope is 1 4 in 12 which is about 1 2 degrees for a membrane roof.

Minimum flat roof slope ibc. 2 exactly does not translate to 1 4 per foot. The following tableprovides the minimum required allowable roof slope for each type of roofing material mentioned in the code. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. Lap sealants shall be applied in accordance with the approved manufacturer s installation instructions.

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 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. 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.

The code may still have a provision for hot mopped asphalt but i cannot see this being used in the middle east. 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. 2 12 minimum roof slope for asphalt shingles photovoltaic pv shingles and building integrated pv. What kind of rain fall rates are you looking at.

This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. This is the basis for calculating the angle which is approximately a 1 19 degree slope. The minimum roof slope allowed by code for any type of roofis in 12 applicable only to coal tar pitch roof systems. Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope.

The minimum slope for standing seam metal roof panel systems shall be one quarter unit vertical in 12 units horizontal 2 percent slope. Minimum slope for asphalt shingles the requirements for an asphalt shingles roof are contained in the international building code. 3 12 minimum roof slope for metal roof panels with nonsoldered seams without applied lap sealant metal shingles and wood shingles. For steep slope roof systems ibc 2018 provides for a 1 12 minimum roof slope for mineral surfaced roof roll roofing.

So typically we follow 2 slope is that meeting the code even if the slope is slight shy of 1 4 per foot. 2 1 2 12 minimum roof slope for clay and concrete tile. The minimum roof slope for metal roof panels depend on 3 different scenarios. 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.

If you are using a metal panel roof then you may need to go steeper.