When asphalt shingles absorb water, they tend to expand. This, in addition to the expansion and contraction that happens due to temperature fluctuations, tends to cause bubbles and blisters on asphalt shingles. This is something that, with time, happens to all asphalt roofs.
Roof bubbles and blisters usually destroy the aesthetic value of a shingle roof. But that is not all the damage they cause. These bubbles represent areas of weakness on a roof which—when not repaired on time—usually result in roof leaks.
Luckily, getting rid of these bubbles is something that you can do on your own. The following are steps that will help you do so.
Gathering your tools
To fix a shingle roof bubble, you will need a couple of tools. You will need an asphalt shingle for patching the damaged part, a utility knife for cutting the shingle and roofing cement to bind the patch onto the roof. For easy application of the roofing cement, you will need a putty knife.
Cutting the bubble
Use a utility knife to make an incision on the bubbled area. Make sure that you extend the cut a few inches past the edge of the bubble. This will ensure that the area under the bubble is adequately exposed, something that will make your work easier as it will help to ensure that you can easily access the inner parts of the bubble.
When making the incision, it is important that you take care not to cut too deep. Doing so may end up damaging the roof's felt underlayment—this may lead to more bubble problems.
Applying the roof cement
With the material forming the bubble out of the way, use a putty knife to fill the cut area with roofing cement. Make sure that you spread the cement a few inches, in each direction, past the bubbled area. This will help to ensure that the patch has a big-enough adhesive surface on which it can stick.
Cutting and placing the patch
With the cement in place, use a utility knife to carve a patch from the asphalt shingle. The rule of the thumb is that the patch has to be bigger than the area it is supposed to seal. One or two inches larger than the bubble will do the trick.
Thereafter, insert the carved patch through the incision and then place it on the cement in such a way as to cover the entire bubbled area. After that, apply pressure on the slit to close it and then cover the area with roofing cement.
If you don't feel your home repair skills are up to the task, contact a local roofing contractor (such as Freedom Roofing).