If you have your asphalt shingle roof installed several years ago or even five or seven years ago, then you may be surprised to see some cracks appearing in the shingles. While cracks are a common issue, they are sometimes the result of something called thermal cracking. This is an issue that can develop due to defective shingles. Keep reading to learn about the problem and what you can do about it.
What Is Thermal Cracking?
When your roof is subjected to warm and cold temperatures, they are subjected to thermal strain. This stress causes the bitumen to expand and contract, and the fiberglass also shifts and moves. When this happens, the shingles are supposed to remain somewhat malleable and flexible. However, some shingles are made with a fairly thin fiberglass mat. These shingles are sometimes marketed as lightweight varieties, but they are unable to remain strong. The expansion and contraction then cause the fiberglass mat to tear apart.
When the mat starts to come apart, a crack develops through the shingle. The cracks typically form a linear or geometric pattern across the roof that looks much like a spiderweb or a strike of lighting.
While only a few cracks may develop at one time, more and more will appear across the surface of the shingles. Leaks are then likely to develop.
What Can You Do About Thermal Cracks?
Since thermal cracking is a sign of asphalt shingle defection and failure, the only true repair is to have the shingles completely replaced. The good news is that extremely thin asphalt shingles are rarely used any longer due to the known thermal cracking issue. Also, more stringent guidelines are used when manufacturing shingles so fiberglass mats can retain their strength over time.
While a roof replacement is likely necessary at some point soon, you may want to wait until more widespread thermal cracking is noted. If the problem has just started, then you can patch some of the cracks that you see. A long bead of roofing cement placed above and below each crack is a good way to make temporary repairs.
If you want your repairs to also remain strong against UV damage, then look for some dislodged shingle granules in your gutters and sprinkle them over the cement. You can also buy some new granules from your local home store or roofing supplier.
If you want to know more about thermal asphalt shingle cracking, defective shingles, and roof shingle replacement, speak with your local roofing professional, like Advantage Roofing.Share
18 May 2017
I was concerned that a recent hailstorm might have caused damage to my roof. While inspecting my roof, the roofing contractor noted cracked shingles and granule loss from the impact of the hailstones. I didn't want my roof to start leaking, so I immediately had the damaged shingles replaced. Hi, my name is Troy Blakely and in this blog, you'll find out about the various types of shingle damage. You'll also learn how to determine if you need to have your roof repaired or replaced. I didn't know this information until the roofing contractor explained it to me. Then I decided that I would help other people by spreading the word. A damaged or leaky roof can cause expensive damage to the inside of your home and that's why it's so important to address roof issues as quickly as possible.