The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
Minimum slope shingle roof in orange county florida.
Roof assemblies rooftop structures 1507 roof coverings with slopes 2 12 or greater.
A shingle roof like this north dallas garage in the photo above may have a failure no matter how good a job the installer did.
Roof slopes of four units vertical in 12 units horizontal 33 percent slope or greater.
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In wind zones greater than 110 mph fastening is based.
Underlayment shall be applied shingle fashion parallel to and starting from the eave and lapped 4 inches 51 mm end laps shall be 6 inches and shall be offset by 6 feet.
Shingles of all types need to have a slope to function properly.
Florida has more roofing regulations than you may realize.
The requirements for an asphalt shingles roof are contained in the international building code.
Where the roof slope exceeds 21 units vertical in 12 units horizontal 21 12 175 percent slope shingles shall be installed as required by the manufacturer.
Minimum slope for asphalt shingles.
Thermoplastic single ply membrane roofs must have a design roof slope of 1 4 12 or greater 2 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 minimum requirement is 2 12.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
Owens corning produces high quality asphalt coating asphalt sealants and adhesives for asphalt shingles.
1507 3 asphalt shingles 1507 3 6 fasteners requires the use of roofing nails 1507 3 7 attachment in wind zones up to 110 mph prescriptive provision of 4 fasteners per shingle.
Roof coverings installed on low slope roofs roof slope 2 12 in accordance with section 1507 shall resist impact damage based on the results of tests conducted in accordance with astm d 3746 astm d 4272 cgsb 37 gp 52m or the resistance to foot traffic test in section 5 5 of fm 4470.
What is the minimum slope for an asphalt shingle roof the short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
Asphalt shingles shall have the minimum number of fasteners required by the manufacturer but not less than four fasteners per strip shingle or two fasteners per individual shingle.
This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit.
All structural metal roofing systems.
The same can also be the case when the tiled roof has a reduced exposure.
Let owens corning help you determine when it is time for a new roof and then let us help you choose the shingles for your roof that are right for you.
This minimum slope requirement can be found in the installation instructions for almost every manufacturer and.
That works out to about nine degrees if that works better for you.
