Understanding Roof Deck Requirements
Proper roof deck preparation is crucial for the successful installation of asphalt shingles. Owens Corning outlines specific requirements to ensure the integrity and longevity of their asphalt shingles. This technical bulletin addresses the necessary conditions and limitations for roof decks, particularly those involving spaced sheathing or deck boards.
Key Requirements for Roof Decks
Solidly-Sheathed Roof Decks
- Plywood Sheathing:
- Minimum Thickness: 3/8-inch
- Rating: Must be rated by The Engineered Wood Association (APA)
- Installation: Ensure 1/8-inch to 1/4-inch spacing at all panel edges and end joints. Follow the sheathing manufacturer’s and local building code requirements for installation.
- Oriented Strand Board (OSB):
- Minimum Thickness: 7/16-inch
- Rating: Must be rated by The Engineered Wood Association (APA)
- Installation: Ensure 1/8-inch to 1/4-inch spacing at all panel edges and end joints. Adhere to the manufacturer’s and local building code requirements for proper installation.
Decks Constructed with Spaced Deck Boards
- Minimum Width: 6 inches
- Minimum Thickness: 3/4-inch
- Spacing: Maximum 1/4-inch spacing between boards. Repair any holes or gaps greater than 1/4-inch or replace the boards.
Surface Preparation for All Roof Deck Types
- Ensure the roof deck surface is clean, dry, and free of debris, protrusions, dust, and oil before installing underlayment or asphalt shingles.
- Owens Corning asphalt shingles should never be installed directly over insulation board of any type.
Additional Notes on Installation
- Inspection and Repair: Before installing shingles, inspect the roof deck thoroughly. Repair or replace any damaged or inadequate sections to ensure a solid foundation for the shingles.
- Adherence to Codes: Always follow local building codes and the specific guidelines provided by the sheathing manufacturer to ensure compliance and optimal performance of the roofing system.
Importance of Proper Deck Preparation
A well-prepared roof deck is essential for the longevity and performance of asphalt shingles. Proper spacing, thickness, and installation techniques prevent issues such as warping, shifting, and moisture intrusion, which can compromise the roof’s integrity.
Conclusion
Following Owens Corning’s roof deck requirements ensures a durable and effective roofing system. Proper preparation and adherence to guidelines protect your investment and maintain the integrity of your roof.
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Disclaimer: This article is intended for informational purposes only. For professional advice, consult experts in the field.
