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Texas Roofing Codes

  • Building Permits: A permit is required for most roofing projects. Homeowners should check with their local city or county for specific requirements.

  • Wind Resistance: Roofing materials must meet wind resistance requirements based on the building’s location. Coastal areas (like Houston and Galveston) may require higher wind ratings due to hurricane risks.

  • Underlayment: A minimum of one layer of No. 15 felt or synthetic underlayment is required beneath roofing materials. Some cities may require No. 30 felt for added durability.

  • Ice and Water Shield: Required in certain areas, especially along eaves and valleys, to prevent water infiltration.

  • Roof Decking Requirements: Decking must be solidly sheathed (such as plywood or OSB) and free from rot or damage before new shingles are installed.

  • Flashing Installation: Flashing must be installed in all roof valleys, around chimneys, skylights, and where roofs meet walls.

  • Shingle Installation: Asphalt shingles must be installed per the manufacturer’s instructions, with a minimum of four nails per shingle (or six nails in high-wind areas).

  • Roof Slope Requirements: Certain materials, like asphalt shingles, require a minimum roof slope of 2:12 (2 inches of rise for every 12 inches of run). Low-slope roofs require modified bitumen or other approved materials.

  • Ventilation Requirements: Attic ventilation must meet 1 square foot of venting per 150 square feet of attic space, or 1:300 with a vapor barrier. Proper intake and exhaust vents are required.

  • Drip Edge Installation: A drip edge is required along eaves and gable ends to direct water away from the fascia and prevent rot.

  • Fire Rating: Roofing materials must have a minimum Class C fire rating, with some areas requiring Class A for added fire resistance.

  • Hail-Prone Areas: In hail-prone areas (such as North Texas), impact-resistant shingles may be required or recommended for insurance discounts.

  • Energy Code Compliance: Certain cities may require cool roofing materials or radiant barriers to meet energy efficiency standards.

  • Tear-Off Requirements: In most areas, only two layers of shingles are allowed. If a third layer is needed, the existing roof must be removed before installing new shingles.

  • Gutters and Drainage: Some municipalities require gutters and downspouts to direct water away from the foundation.

  • Final Inspection: A final roofing inspection may be required to ensure compliance with local building codes.

🔹 Important Note: Roofing codes can vary by city and county. Always check with your local building department before starting a roofing project to ensure compliance with the latest regulations.

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