How To Maintain The Roofing System of Your Tacoma Real Estate Home

If your roof has light-colored shingles, you may see black streaks on them, especially on the north side. The problem is caused by mildew or fungus growth. There is less sunlight on the north side, so the roof stays damp. Mildew loves a damp surface. The best way to prevent this algae growth is to provide sunlight and natural ventilation to dry the roof. Obviously, this is not always possible. At least keep all tree branches and leaves about 4 feet away from the roof. Short of replacing the roof, there is no good quick fix. You could try killing the mildew with a strong solution of laundry bleach and water. Spray or brush the solution on the roof and wait until the areas turn lighter. Then rinse well. You could also use a mildew wash that is sold in paint stores for washing painted wood siding. Several cautions about using bleach: protect yourself, the gutters, and plant materials. Spilled bleach solution can kill grass and bushes. Use eye and skin protection. Do not walk on the roof while cleaning; it will be slippery and dangerous. Work from a ladder or use other special equipment. Flush the gutters and metal flashing well to prevent damage. I suggest you hire a professional roofer for the cleaning. You can also purchase a product called Shingle Shield, which consists of zinc strips that are placed under the shingles near the peak of the roof. The zinc reacts with rainwater to produce a chemical that prevents the growth of fungus and mildew. Again, consult a professional roofer. Although the product inhibits the growth of new algae, it may not remove existing algae. If you ever plan to replace the roof or build a new house, keep in mind that several shingle manufacturers offer shingles with a built-in mildew- resistant chemical.