If you are using a metal panel roof then you may need to go steeper.
Minimum flat roof slope ibc.
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.
According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal.
For steep slope roof systems ibc 2018 provides for a 1 12 minimum roof slope for mineral surfaced roof roll roofing.
2 1 2 12 minimum roof slope for clay and concrete tile.
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.
2 12 minimum roof slope for asphalt shingles photovoltaic pv shingles and building integrated pv.
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 code may still have a provision for hot mopped asphalt but i cannot see this being used in the middle east.
The minimum slope for standing seam metal roof panel systems shall be one quarter unit vertical in 12 units horizontal 2 percent slope.
Ibc callouts for min 2 or 1 4 per foot.
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.
What kind of rain fall rates are you looking at.
I am looking at the ibc minimum roof slope requirement for standing seam metal roof.
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 allowed by code for any type of roofis in 12 applicable only to coal tar pitch roof systems.
This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units.
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.
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.
Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope.
2 exactly does not translate to 1 4 per foot.
The ibc minimum required roof slope is 1 4 in 12 which is about 1 2 degrees for a membrane roof.
