Yes, inadequate roof ventilation can cause shingles to blister.

In Shreveport’s humid subtropical climate, a poorly ventilated attic can reach temperatures as high as 170°F on a 90°F day. This extreme heat creates an “oven-like environment” that effectively cooks the roofing materials from the inside out.

According to the provided content, this thermal stress leads to several forms of premature shingle degradation, including:

• Blistering: Excessive heat buildup below the roof surface can cause asphalt shingles to blister.
• Curling and Cracking: The shingles may warp or break due to intense heat exposure.
• Granule Loss: Heat accelerates the loss of protective granules that shield shingles from damaging UV rays.

Maintaining a balanced intake and exhaust ventilation system is critical to expelling this trapped heat. Without it, the lifespan of the roof is significantly shortened, and the shingles may fail long before their expected expiration date.

• Roof Ventilation Problems Symptoms: Common Signs to Watch For