Short Answer
Some roofing products have temperature-related installation requirements. The contractor should follow the manufacturer's installation requirements.
Detailed Explanation
Asphalt shingles can be installed in cold weather, but there are considerations. The self-sealing strip on shingles (the adhesive that bonds shingles together) may not activate properly in cold temperatures — it typically needs warm weather to soften and bond. In cold weather, shingles are also more brittle and can crack during installation. Manufacturers typically specify minimum installation temperatures (often 40°F or above) for proper sealing. Some manufacturers allow cold-weather installation with additional hand-sealing or special adhesives. Ice and water shield can be more difficult to adhere in cold temperatures. A contractor who installs in cold weather should follow manufacturer requirements and take additional steps to ensure proper sealing and prevent damage to shingles.
Why It Matters
Cold-weather installation requires special attention to manufacturer requirements. Improper cold-weather installation can lead to sealing failures and wind damage.
Code & Manufacturer Considerations
Manufacturer installation instructions specify minimum temperature requirements. Installation outside these requirements may void the warranty.
Building codes and permit requirements can change. Always verify the current requirements applicable to your municipality and project.