Best Temperature for Roof Shingle Installation | Seasonal Roofing Tips
For asphalt shingles, the ideal ambient temperature range for installation is generally between 40°F (4°C) and 85°F (29°C). Many manufacturers specify a range closer to 50°F to 85°F, with some even suggesting an optimal range of 70°F to 80°F (21°C to 27°C).
This range is critical because asphalt shingles contain self-sealing adhesive strips that rely on warmth to properly activate and bond the shingles together. When temperatures are within this ideal range, the adhesive softens, creates a secure seal, and the shingles remain flexible enough to be handled and installed without damage.
Risks of installing shingles in cold or hot weather
Attempting to install asphalt shingles outside the optimal temperature range can lead to several problems, impacting both the immediate installation and the long-term performance of your roof.
Risks of installing shingles in cold weather (Below 40°F / 4°C):
Brittleness and Cracking: Asphalt shingles become stiff and brittle in cold temperatures. This makes them difficult to bend, cut, or nail without cracking or breaking. This can lead to wasted materials and compromise the integrity of the roof.
Poor Adhesive Sealing (Thermal Activation): The self-sealing adhesive strips on shingles may not activate properly in cold weather. Without a strong bond, shingles are more susceptible to wind uplift and blow-offs, especially before warmer weather arrives to "seal" them down. This can also potentially void manufacturer warranties.
"Cold Curling": Shingles installed in cold weather might develop a "cold curl" where the edges don't lay flat, leading to an uneven appearance and potential pathways for water.
Nail Problems: Nails can more easily be overdriven or punch through brittle shingles, reducing their effectiveness and creating potential leak points.
Safety Hazards: Cold weather increases risks for roofing crews, including slippery surfaces (ice/frost), reduced dexterity, and shorter daylight hours.
Risks of installing shingles in hot weather (Above 85°F / 29°C):
Excessive Softening: High temperatures make shingles overly soft and pliable. This means they can be easily scuffed, marred, or even torn by foot traffic or tools during installation, leading to aesthetic and functional damage.
Granule Loss: Walking on very hot, soft shingles can cause the protective granules to dislodge, reducing the shingle's UV protection and lifespan.
Adhesive Issues: While heat activates the adhesive, extreme heat can cause it to become too sticky, making shingles difficult to separate from the bundle or leading to premature bonding before proper alignment. It can also cause wrinkles in the underlayment to transfer through to the shingles if they seal too quickly.
Worker Safety: Roofing in extreme heat is physically demanding and poses risks of heatstroke and exhaustion for the crew.
Thermal Expansion: Constant expansion and contraction in extreme hot-to-cold cycles can accelerate shingle aging, leading to cracks, warping, and blistering over time.
Tips for successful installation in varying temperatures
Experienced roofing contractors employ specific techniques to mitigate the risks associated with less-than-ideal temperatures.
In cold weather:
Store Shingles Warm: Keep shingle bundles in a heated area (above 70°F) for at least 24 hours before installation to improve flexibility. Bring only a few bundles to the roof at a time.
Hand-Sealing: Supplement the self-sealing strips with a thin bead of approved asphalt roofing cement (roofing tar or mastic) under each shingle tab. This provides an immediate bond until the weather warms up enough for thermal activation.
Careful Handling: Avoid bending, dropping, or throwing shingle bundles. Handle individual shingles with extra care to prevent cracking.
Adjust Nail Guns: Calibrate nail guns to avoid over-driving nails through brittle shingles. Hand-nailing might be preferred in very cold conditions.
Work in Sunniest Times: Schedule work during the warmest, sunniest parts of the day (e.g., late morning to mid-afternoon) to leverage natural heat.
In hot weather:
Work During Cooler Hours: Schedule installation for early mornings or late afternoons when temperatures are lower.
Careful Foot Traffic: Wear soft-soled shoes and minimize walking on freshly laid shingles to prevent scuffs, granule loss, or indentations. Use kneepads or foam cushions when working directly on shingles.
Stacking and Storage: Avoid stacking shingle bundles in direct sunlight on the roof for extended periods. Keep them shaded until ready for installation to prevent them from becoming too soft.
Ventilation: Ensure adequate attic ventilation is in place to help reduce the roof deck temperature.
Can you install roof shingles in winter or summer?
Yes, you can install roof shingles in both winter and summer, but with significant caveats and increased precautions.
Winter Installation: Possible, but generally more challenging and less ideal. Professional roofers in colder climates are experienced in mitigating risks by using hand-sealing, warming shingles, and adjusting techniques. However, prolonged periods of freezing temperatures can make it impossible or ill-advised due to safety concerns and product limitations. The primary concern is ensuring the shingles properly seal.
Summer Installation: Often seen as the "ideal" time due to consistent warmth for sealing. However, extreme heat waves can present their own set of challenges related to shingle softening, granule loss, and worker safety. In very hot climates, special heat-resistant shingles or highly reflective coatings might be recommended.
For optimal results and to ensure manufacturer warranty compliance, it's always best to work within the recommended temperature ranges.
When to reschedule your roofing project
A reputable roofing contractor will prioritize safety and the quality of your roof, even if it means rescheduling. Here are common reasons to delay or pause a roofing project:
Temperatures Outside Manufacturer Guidelines: If ambient temperatures are consistently below 40°F or above 85°F (or the specific range for your chosen shingle brand), it's best to reschedule, especially for extensive projects.
Precipitation (Rain, Snow, Ice): Never install a roof in wet conditions. Moisture can compromise adhesive bonding, lead to mold or rot underneath, and create dangerous working conditions.
High Winds: Strong winds (generally above 20-25 mph) can make it unsafe for workers, blow debris around, and make it difficult to properly align and fasten shingles, increasing the risk of blow-offs.
Frost or Ice on the Roof Deck: Even if the air temperature is above freezing, if there's frost or ice on the roof surface, it's unsafe and can prevent proper adhesion.
Forecast for Prolonged Adverse Weather: If the forecast indicates several days of unsuitable conditions, a good contractor will typically reschedule to ensure continuous, quality work.
Choosing the right time and the right team for your roofing project is crucial for its success and your home's protection.
Is your roof ready for an upgrade, or do you need a professional assessment? Don't leave your home exposed to the elements. Contact Masterpiece Roofing today for a free consultation and ensure your roof is installed with precision and care, no matter the season!
