The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
Florida minimum roof pitch.
Refer to frsa tri florida high wind concrete and clay roof tile installation manual fifth edition 2012 where the basic wind speed v asd is determined in accordance with section 1609 3 1 for underlayment and slope requirements for specific roof tile systems or the recommendations of ras 111 118 119 or 120.
The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
Importance of a roof pitch.
However you can only use this pitch with built up roofing or specialized synthetic roofing.
Lap sealants shall be applied in accordance with the approved manufacturer s installation instructions.
All metal roofing systems testing requirements shall be as follows.
The minimum roof pitch is also subject to the standards set forth by the various building codes used in the respective regions.
That s a 7 12 pitch the roof gets 7 inches higher for every 12 inches of run toward the peak.
Let us recap on the minimum roof pitch required for each type of roofing material.
The minimum slope for standing seam roof systems shall be one quarter unit vertical.
There are laws regarding who can work on roofs how roofs must be installed or repaired when roofs may be reroofed and much more.
Most of these laws are found in the sixth edition of the florida building code which went into effect on dec.
Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater.
Reroofing shall not be required to meet the minimum design slope requirement of 12 in section 1507 of the florida building code building for roofs that provide positive roof drainage high velocity hurricane zones shall comply with sections 1515 2 2 1 and 1515 2 2 2 of the florida building code building.
All metal roofing shall resist a minimum wind uplift resistance as determined by chapter 16 high velocity hurricane zones for a roof slope of 9 5 degrees 0 0166 rad and a roof mean height of 15 feet 4 6 m.
The chief reason for having a roof pitch is to redirect water and snow away from the roof and avoid any percolation that might result from stagnation of water on the roof.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
Asphalt shingles require a minimum roof pitch of 2 12 or greater.
Metal roof shingles require a minimum roof pitch of 3 12 or greater.
Florida has more roofing regulations than you may realize.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
All metal roofing shall be tested in compliance with tas 100.
