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  • Mary de Leon

Roofing Guide: Common Codes and Requirements


Code requirements change periodically as building codes are updated. As a homeowner, it's important to familiarize yourself with which codes apply to your property. It is always wise to check local requirements and modifications to the model codes with the authority having jurisdiction if observed conditions or practices differ from manufacturer or industry recommendations.



For easy reference, we have compiled some of the most common codes in the State of North Carolina:


R905.2.4.1 - No 3-tab shingles available with wind resistance speed of 90mph per IRC code



R903.1 & R904.1 - wind requirements (for the local building code) state: Roof Assemblies shall be designed and installed in accordance with this code and APPROVED MANUFACTURES INSTALLATION INSTRUCTIONS. You can not use 3 tab or dimensional shingles as a started course because it will not meet the local, national, ARMA and Manufactures building requirements.


R905.2.8.3 - CAN NOT REUSE FLASHING ONCE IT HAS BEEN FOLDED TO REMOVE NAILS AND FELT OR ONCE A NAIL GOES THROUGH IT ON THE INITIAL INSTALLMENT because it will be damaged and will not meet the LOCAL NATIONAL, ARMA AND MANUFACTURES BUILDING REQUIREMENTS.


R905.2.3; Underlayment - Unless otherwise noted, required underlayment shall conform with ASTM D 226, Type I, or ASTM D 4869, Type I.


R905.2.1; Sheathing requirements - Asphalt shingles shall be fastened to solidly sheathed decks.

R905.2.2; Slope - Asphalt shingles shall only be used on roof slopes of two units vertical in 12 units horizontal (2:12) or greater. For roof slopes from two units vertical in 12 units horizontal (2:12) up to four units vertical in 12 units horizontal (4:12), double underlayment application is required in accordance with Section R905.2.7.


R904.5 & R908.5 - Existing vent flashing, metal edgings, drain outlets, collars and metal counterflashing shall not be reinstalled where rusted, damaged or deteriorated. Aggregate surfacing materials shall not be reinstalled.


R806.1; Ventilation Required - Enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof rafters shall have cross ventilation for each separate space by ventilating openings protected against the entrance of rain or snow. Ventilation openings shall have a least dimension of 1/16 inch (1.6 mm) minimum and 1/4 inch (6.4 mm) maximum. Ventilation openings having a least dimension larger than 1/4 inch (6.4 mm) shall be provided with corrosion-resistant wire cloth screening, hardware cloth or similar material with openings having a least dimension of 1/16 inch (1.6 mm) minimum and 1/4 inch (6.4 mm) maximum. Openings in roof framing members shall conform to the requirements of Section R802.7. Required ventilation openings shall open directly to the outside air.


Safety is a top concern now more than ever - this includes your home. We need to make sure that our home improvement projects are safe, from the installation process to the materials being used.


Maven is the best roofing contractor in Eastern North Carolina, and you can rest assured that we follow all home building requirements from beginning to end. We not only stay up to date on the codes that apply to your home; we understand the requirements at the local and state level. Let your local roofing experts take the worry out of roof replacement process!







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