Moss on roof tiles? Is There a Cure?

AAA Gerry Ray’s Roofing Inc.

Do you have moss on your roof tiles and not sure what to do?
Here are some useful Moss and Algae Prevention Tips
1.“Green” roofs are not desirable when the green is from moss or algae. On north-facing slopes or roofs in heavily shaded areas, these greens can thrive. While algae is unsightly, moss damages most types of shingles, decreasing their lifespan.

2. For new roofs, the following tips can prevent moss and algae from forming on roof tiles:
Use an algae resistant roofing material. Metal roof coverings resist this growth, and some algae-resistant asphalt, composite, and other shingles are available.

Detail a zinc or copper strip with a 3 inch exposure just below the ridge. Rain will wash over the metal strip and treat the shingles below with mold- and algae-resistant properties. Consider, however, that zinc can pollute waterways, and tarnished copper may stain.

3. Remove overhanging branches to provide more sunlight and allow the roof to dry faster.

4. Educate clients and homeowners about the importance of a maintenance program (removing accumulated debris and hosing off moss periodically) to extend the life of the roof.
For existing roofs with a mold or algae problem, the problem must be removed and steps taken to prevent its recurrence.

5. Check the roof warranty to see what types of cleaning may void the warranty, and avoid these methods.

6. Wet mossy roofs can be very slippery. Service providers can be hired to clean moss and algae off roofs.

7. Focus cleaning efforts on the areas that need it. Hosing and brushing should be done from the top of the shingle down. Avoid chlorine bleach, which can discolor wood and harm the environment. Oxide bleach may be a better choice. Pressure washing may also damage roof materials.

8. Remove overhanging branches, add a metal strip near the ridge, and institute a regular maintenance program to prevent moss from returning.

AAA Gerry Ray’s Roofing Inc.

253-531-6894 Office
253-394-6687 Cell

Gerry Ray