Longmont Colorado Roofing One-Square Rule

The “One Square Rule” in Longmont, Colorado, is a roofing regulation that mandates a full roof replacement if more than 100 square feet (one roofing square) of the roof requires repair or replacement. This rule applies to both residential and commercial properties and is designed to maintain the structural integrity and uniformity of roofing systems.

Key Aspects of the One Square Rule

• Threshold for Full Replacement: If the damaged area exceeds 100 square feet, the entire roof must be replaced, not just the affected section
• Permit Requirements: Any roofing project involving more than 100 square feet necessitates obtaining a building permit from the City of Longmont.
• Insurance Implications: This rule can influence insurance claims, as policies should cover full roof replacements when damage surpasses the 100-square-foot threshold.

Additional Roofing Code Requirements in Longmont

• Material Standards: Asphalt shingles must be rated for sustained winds of 110 mph. Northern Lights Exteriors recommends a Class IV Impact Resistant shingle to help protect your home and hopefully keep you from having to install a new roof after the next hail-storm.  Lots of companies may recommend inferior products for a “repeat business” mentality.  Since we live, play, work, and volunteer in Longmont, CO – we put roofing materials on that shouldn’t just end up in our local landfills.
• Installation Practices: Overlaying new shingles over existing ones is prohibited; all existing roofing materials must be removed before installation.
• Ventilation: Proper attic ventilation is required unless a closed cavity roof system with condensation control is used, complying with specific insulation requirements.
• Ice and Water Shield: Installation of ice and water shield is mandatory, especially in areas prone to ice damming.
• Drip Edge: Drip edges are required at both eaves and rakes to prevent water infiltration.

Importance for Homeowners and Contractors

Understanding and adhering to the One Square Rule is crucial for homeowners and contractors in Longmont to ensure compliance with local building codes, avoid potential fines, and maintain the safety and longevity of roofing systems. For more detailed information or specific inquiries, contact Northern Lights Exteriors, a roofing company that’s been installing Longmont roofs since 2001. 

Related reading: how roof claim supplements work in Colorado — including how municipal code requirements like this one get documented for your adjuster.