Your roof vents are the lifeblood of your roof system. If you have poor ventilation, your roof system will fail prematurely. The sun will cause the ceramic granules to break free of the tar matting. This causes the shingles to become porous and will begin to leak over a period of time. Do not fall suspect to poor roof ventilation. Have a contractor to look at your present ventilation system. Owens Corning has a great solution for roof ventilation problems. Be sure to use the horizontal style for it works more efficiently.
Danny Baird
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