Spraying a roof for moss requires using the right solutions and techniques to effectively kill the moss without damaging your roof. Here's a breakdown:
1. Safety First:
- Wear safety glasses, gloves, and appropriate footwear with good grip.
- Consider using a safety harness, especially on steeper roofs.
- Have a spotter on the ground.
2. Choose the Right Moss Killer:
- Zinc Sulfate or Copper Sulfate: These are common and effective moss killers. Follow the manufacturer's instructions for dilution. These can be purchased at most hardware stores.
- Bleach (Sodium Hypochlorite): A diluted bleach solution (1 part bleach to 3 parts water) can also kill moss. However, be extremely careful using bleach. It can discolor roofing materials and damage surrounding plants. Thoroughly rinse the area after application and avoid contact with skin or eyes.
- Commercial Moss Removal Products: Many commercially available moss removal products are designed specifically for roofs. These often contain ingredients that are less harmful to roofing materials and plants than bleach. Follow the product label instructions exactly.
3. Application Methods:
- Sprayer: A garden sprayer is the most common method. Ensure the sprayer is clean and in good working order. Choose one with an adjustable nozzle for even coverage.
- Brush: For smaller areas, a soft-bristled brush can be used to apply the solution. This is helpful for targeting specific patches of moss.
- Do not use a pressure washer: Pressure washing can damage asphalt shingles by removing granules, causing premature wear and potential leaks by forcing water under the shingles, which can then curl.
4. Application Steps:
- Clean the Roof (Optional): Remove loose debris, leaves, and twigs before applying the moss killer.
- Apply the Solution: Spray the affected areas thoroughly, ensuring the moss is completely saturated. Overlap your spray patterns to ensure even coverage.
- Allow Dwell Time: Let the solution sit on the moss for the time specified on the product label. This is crucial for the moss killer to work effectively.
- Rinse (If Necessary): Some solutions require rinsing after a certain period. Check the product label. If using bleach, rinsing is essential to prevent damage to roofing materials and surrounding vegetation. Use a gentle spray from a garden hose.
- Monitor and Reapply (If Needed): Check the roof after a few weeks. If moss persists, reapply the solution following the same steps.
5. Prevention:
- Trim Overhanging Branches: Removing branches that create shade and moisture will discourage moss growth.
- Install Zinc or Copper Strips: Place strips of zinc or copper near the ridge of the roof. Rainwater will carry trace amounts of these metals down the roof, inhibiting moss growth.
Important Considerations:
- Roof Material: Different roofing materials (asphalt shingles, tile, wood shakes) may react differently to moss killers. Always test a small, inconspicuous area first.
- Environmental Impact: Be mindful of the environmental impact of the moss killer you choose. Avoid runoff into waterways.
- Professional Help: If you are uncomfortable or unsure about spraying your roof for moss, consider hiring a professional roofing contractor. They have the experience and equipment to do the job safely and effectively.
