Ask The Roofing Expert – Greg Wilson
In a previous article I stressed the importance of proper underlayment to maximize the life of the shingles on top. Here in this picture is a perfect example. You can clearly see that the bottom 4 feet of the roof looks almost new, while the rest of the roof looks to be 15-20 years old already. The shingles are curled up really bad and are missing lots of granules. Well these shingles in this picture are only about 6 years old and already need to be replaced. This side of the roof faces south, so it gets full sun exposure all day long. To prevent the new shingles from decomposing early, I used a synthetic felt replacement of the entire roof deck. This synthetic felt will minimize the heat transfer from the attic to the shingles which will help extend the shingle life.
The second part to this early deterioration is lack of ventilation. This home has older wooden soffits with a few holes spaced fairly far apart. This also accelerated the process because of poor air exchange in the attic, there is not enough air coming in to draw the hot air out of the attic.
When a customer has a problem like this I never simply just replace the shingles, only to come back again in 6 years because of the same problem. I always look for the problem and fix it right the first time; while educating the home owner about their home and roof.