There is no magic spray that will significantly extend the life of asphalt shingles beyond their natural lifespan, and many products marketed as shingle rejuvenators have limited proven benefit and may even void warranties. The best way to make shingles last longer is proper maintenance, not a spray. However, there are some protective treatments that can help preserve appearance and prevent damage. Algae and moss prevention sprays containing zinc or copper can help prevent biological growth that holds moisture and accelerates granule loss. Installing zinc or copper strips near the ridge provides a continuous low-dose wash of metal ions with each rain that inhibits growth. Some companies market asphalt shingle rejuvenator sprays that claim to restore oils to aged shingles, typically soybean oil based emulsions. While these may temporarily make shingles look darker and more flexible, independent testing shows limited long-term lifespan extension, and some manufacturers warn that coatings can void warranties by trapping moisture or interfering with sealant strips. The most effective actions to make shingles last longer are not sprays at all, but ensuring excellent attic ventilation with balanced soffit and ridge vents to reduce heat, keeping gutters clean, removing debris, trimming overhanging branches to reduce shade and debris, and promptly replacing any damaged shingles. If you do want to spray something, use a shingle-safe algae inhibitor after cleaning, not a sealant or waterproofing coating.
1 votes
Marked as accepted