How Humidity And Heat Can Damage Your Asphalt Shingle Roof

Extreme weather conditions can take a toll on your residential or commercial roofing. In particular, high heat and humidity levels can cause significant damage to your asphalt shingle roof. Understanding these potential dangers and taking preventive measures can help prolong your roof's life, ensuring it protects your home or business effectively.

The Disastrous Impact of Heat on Your Asphalt Shingle Roof

Heat can be a formidable enemy for your asphalt shingle roof. The scorching summer sun can cause temperatures on your roof to skyrocket, often reaching up to 150°F. The detrimental effects of such high heat on your roofing system are manifold

The Unseen Consequences of High Heat

Heat causes expansion. When your roof is subjected to high temperatures, the roofing materials, including the wooden components like the joists, support beams, and the decking, tend to expand. This expansion and subsequent contraction as the roof cools can lead to cracks and gaps. These tiny openings become the perfect gateway for moisture and water infiltrating your home.

The Damaging Effect of Ultraviolet (UV) Rays

While the scorching heat is damaging, the UV rays accompanying it can cause further harm. UV radiation can lead to the deterioration of roofing materials, diminishing their protective properties over time. This degradation can leave your roof vulnerable to leaks and other issues.

The Heat from Within: A Hidden Threat

It's not just the external heat that poses a risk to your asphalt shingle roof. The heat from your home can rise to the attic, creating a hot and humid environment. If your attic lacks proper ventilation, this trapped heat can cause the asphalt shingles to blister and crack. This damage could necessitate a full roof replacement if not addressed promptly.

The Hidden Enemy: Humidity

Humidity might seem harmless, but it can be equally damaging to your roof. High humidity levels can damage moisture, even when it's not raining. Let's delve into how humidity can wreak havoc on your roof.

Moisture: The Silent Destroyer

Humidity reflects the amount of moisture in the air. When this moisture combines with excessive heat, it can compromise your shingles and other wooden roofing components. Furthermore, this moisture can penetrate the exterior roofing materials and become trapped in your attic or crawl space. This trapped moisture can lead to the growth of mold and mildew, which not only weakens the plywood but also poses a health risk

The Destructive Power of Mold

Mold thrives in damp and humid environments. Consequently, excessive moisture trapped in your roof can lead to wood rot, which deteriorates the timber structure of your roof. Depending on the extent of the damage, roof rafters showing signs of decay caused by mold growth may need to be repaired or replaced.

Visible Signs of Heat and Humidity Damage

While heat and humidity can silently damage your roof, they leave some visible signs. Here are some common indicators that your asphalt shingle roof has suffered from heat and humidity damage:

• Discoloration or Fading: UV rays can cause shingles to fade over time. Discoloration is often the first noticeable sign of shingle damage.
• Curling: Fluctuating temperatures can cause shingles to expand and shrink, leading to curling. Curling is also an indication of aging shingles.
• Cracking: High heat can make asphalt shingles brittle, developing cracks near the edges or along the center of a shingle.
• Blisters: Trapped moisture beneath shingles can rise to the surface due to sun exposure, causing heat blisters. These blisters can rupture, leading to vulnerable spots on your roof.