Asphalt roofs are built to withstand various weather conditions, but extreme heat can damage them over time. While Vancouver does not experience the heat of the BC Interior, we occasionally experience high temperatures.
Damage can start at 32°C
For your information, the surface temperature of asphalt shingles can reach damaging levels when the ambient air temperature starts to go above 32°C, especially if the roof is exposed to direct sunlight for prolonged periods without adequate ventilation. In such a case, the surface temperature of the shingles typically goes up to an incredible 60°C.
Take a look at your roof
Homeowners can often detect signs of heat damage from the ground and it is recommended that you take a look if there is prolonged high temperatures. Recognizing these signs early can help you address issues before they escalate into costly repairs.
Telltale signs of damage
One of the most common indicators of heat damage is curling shingles. The edges or corners can curl when shingles are exposed to prolonged high temperatures. This curling creates an uneven surface on the roof, usually seen from the ground. The distortion in the shingles is a telltale sign that your roof is suffering from the effects of extreme heat.
Cracked shingles are another sign to watch for. While small cracks might not be visible from a distance, significant cracks often are. These cracks appear as straight or jagged lines and indicate that the shingles are splitting due to the intense heat drying out the asphalt.
Blistering shingles, which look like raised spots or bubbles on the surface, can also result from heat damage. These blisters form when trapped moisture or volatile compounds within the shingles vaporize. If the blisters are large or numerous, they might be noticeable from the ground.
Granule loss is another visible sign of heat damage. Asphalt shingles have a protective layer of granules that shield them from UV rays. The shingles are vulnerable when these granules loosen and fall off due to high temperatures. You might notice bald spots or areas where the granules are missing. Additionally, granules can accumulate in your gutters or around the base of your downspouts, indicating that they are shedding from the shingles.
Discoloration or fading of the shingles is a more subtle sign of heat damage. Over time, excessive heat can cause the colour of the shingles to fade or change. If parts of your roof appear lighter or have different shades, it could indicate that the shingles are deteriorating due to heat exposure.
Sometimes, heat damage can cause the shingles to warp or distort, giving the roof an uneven or wavy appearance. This distortion can often be seen from the ground and affects the overall uniformity of the roof’s surface.
Proper roof ventilation is a must
The importance of adequate roof ventilation can not be overstressed. Adequate ventilation mitigates these damages.
If you notice any signs of heat damage from the ground, it’s important to take action. Start by documenting the damage with photographs for your records and any potential insurance claims. Then, schedule a professional roof inspection to get a detailed assessment and repair recommendations.
By staying vigilant and addressing visible signs of damage early, you can maintain the integrity of your asphalt roof and extend its lifespan. Proactive care and timely repairs are essential in safeguarding your home against the effects of extreme heat.
