Experts state that the best time to install shingles is when the weather is warm, calm, and dry. However, we know that these ideal conditions are limited. The best that we can do is to range as close to those roofing conditions as possible and avoid working in extreme cold weather conditions.
In general, any outdoor temperature lower than 5 degrees Celsius changes the way our bodies, roofing equipment and shingles perform. Roofing during the colder months comes with its own set of hurdles, and some roofing contractors may turn down the winter shingle roof replacement and recommend replacing the roof in the spring.
Brittle Shingles
As with some materials, asphalt shingles in cold weather become brittle. Hence, extra precaution needs to be taken care of when handling and installing shingles. The slightest bend can crack a shingle without even knowing it. It is recommended to keep them covered in a heated blanket if you are going to be installing them in cold temperatures.
Shingles May Not Seal
Another concern is that the sealant strip will not seal in colder temperatures. Direct exposure to the sun activates the sealant, allowing shingles to bond to the course below. This is a critical process to prevent future wind blow-offs and water/ice from backing up. In addition, dirt and and other debris may accumulate on the shingle sealant area if not sealed right away, hence, it can diminish the chances of your shingles ever sticking to each other. If the concern is that the shingles will not seal during winter they can be all hand sealed with caulking. However, the process is labour-intensive and costly; usually costing the homeowner 20/30 percent more on the final cost of the roof replacement.
May Void Your Warranty
Finally, another thing to consider is that most shingle manufacturers do not warrant shingles that are installed below 5 degrees Celsius. Always follow your shingle manufacturer’s application instructions for cold weather applications as some manufacturers may warrant cold weather application as long as all the shingles are individually hand sealed.