Understanding the Importance of Proper Ventilation
Owens Corning Roofing and Asphalt, LLC (“Owens Corning”) emphasizes the necessity of proper ventilation when installing their roofing systems. Adequate ventilation ensures the longevity and performance of the roofing materials and helps prevent moisture-related issues that can lead to mold and structural damage.
Key Requirements for Ventilation
- Balanced Ventilation System:
- Ensure your attic or rafter space is fully ventilated with a balanced intake and exhaust system.
- Ventilation systems should provide adequate net free vent area (NFVA) that meets or exceeds local building code requirements.
- Building Code Specifications:
- Standard Requirement: 1 sq. ft. of NFVA for every 150 sq. ft. of attic space.
- Reduced Requirement: 1 sq. ft. of NFVA for every 300 sq. ft. of attic space if one or both of the following conditions are met:
- No less than 40% and no more than 50% of the ventilation is exhaust ventilation, located not more than 3 feet below the ridge or highest point.
- In climate zones 6, 7, and 8, a Class I or II vapor retarder is installed on the warm-in-winter side of the ceiling.
- Proper Decking:
- Install the roof system directly over a minimum of 3/8″ plywood, 7/16″ OSB, or 6″ wide by 25/32″ wood sheathing.
Warranty Coverage Considerations
- Standard Warranties:
- Owens Corning’s Standard Limited Warranty and Total Protection Roofing System Warranty cover manufacturing defects in shingles and component products.
- These warranties do not cover damage caused by improper or inadequate roof ventilation, unvented attics, or enclosed rafter assemblies.
- Full warranty coverage applies if Owens Corning determines that shingle damage was caused exclusively by a manufacturing defect unrelated to inadequate roof ventilation.
- Extended Warranties:
- Roofs with Owens Corning extended system warranties (System Protection, Preferred Protection, and Platinum Protection) must be fully ventilated per code requirements.
- Unvented attics, enclosed rafter assemblies, or sealed decks with spray foam or other insulation applied directly to the underside of the deck do not qualify for extended warranties.
Best Practices for Ensuring Warranty Compliance
- Follow Installation Instructions:
- Adhere strictly to Owens Corning’s installation guidelines to ensure the roof system performs as intended and qualifies for warranty coverage.
- Consult Local Building Codes:
- Verify that your ventilation system meets or exceeds local building code requirements.
- Regular Maintenance:
- Inspect your attic and roof ventilation regularly to ensure they remain free of obstructions and operate efficiently.
Conclusion
Proper ventilation is essential for maintaining the integrity and warranty coverage of your Owens Corning roofing system. By following recommended practices and local building codes, homeowners can ensure their roofs are protected and perform optimally throughout their lifespan.
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Disclaimer: This article is intended for informational purposes only. For professional advice, consult experts in the field.
