Rockland County Roofing: Article About All About Your Blistering Roof
Asphalt roof shingles are made of more than just asphalt; these tiles gain their weather-barrier functionality by incorporating a range of materials, such as small stones and microscopic strengthening fibers. When manufactured properly, most shingles possess a smooth appearance. These flat surfaces look good on homes and facilitate the easy passage of flowing water while it drains.
Given time, however, many roof shingles become worn. Some Rockland County roofing even develops rash blisters, a defect characterized by visible irregularities and dents that make affected areas look like blistered skin. While there are differing opinions on what this means for your roof, many homeowners want to correct the issue purely for cosmetic reasons.
What causes blistering? The formerly flat surfaces your shingles used to possess were actually made of a number of small stones that had been pressed into an asphalt layer during factory fabrication. When such stones get knocked out, the asphalt substrate they were embedded in becomes exposed.
From there, the exposed asphalt begins absorbing more moisture than its surroundings, and this can cause it to swell and develop blisters. Of course, this isn't the only mechanism by which such defects are formed.
Even though the stones can be removed by wind or rain, some shingles seem more susceptible to the same kinds of environmental damage than other roofing materials are.
The roofers at Precision Roofing of Rockland County can answer questions regarding asphalt roofing or shingle replacement.
The critical difference often lies in how well the shingles were manufactured in the first place.
Say, for instance, that air bubbles became trapped between layers of asphalt while your shingles were made. After the shingles have been installed on your roof, these pockets of gas will be subjected to heightened temperature gradients, and they'll undergo more drastic expansion and contraction as a result. Even without severe wind or rain, the internal forces of the gases changing volume can cause shingles to separate and destroy themselves from the inside out.
Internal gas pockets can also arise following the degradation of certain volatile materials commonly employed in shingle manufacture. Some organic resins and binders, for instance, release gases as they break down due to heat and UV radiation. Many manufacturers even warn that using certain roofing adhesives to seal the shingles can cause chemical reactions that have the same effect. These blister rashes are often identifiable because they only occur where such sealants were applied.
If you notice blistering on your roof, it's best to speak to a professional. Because this problem can arise for a number of reasons, discovering the exact cause is essential to ensuring that it's not going to pose a long-term risk. While your blister rash may be mild enough that it doesn't really affect the longevity of your roof, it's better to get all the information in advance than to wait until other issues, such as leaks and curling, make an appearance.