Mark K
Elite Member
- Joined
- Jan 27, 2004
- Professional Status
- Certified Residential Appraiser
- State
- Indiana
Zinc also works. They sell a product specifically for this application. Have you ever noticed the roofs below the galvanized vents, etc. No mildew.yep yep yep...a copper sheet on the ridge under the shingles will stop a lot of it. Copper is toxic to algae.
Another product you can spray to kill mildew is Spray and Forget. I've used it on several roofs.