Removing and preventing roof algae
September 13th, 2015 | by Henri
Q. Ten years ago we had put fiberglass roofing shingles over the existing shingles. On one section of the roof,
Browsing the "Algae" Tag
Cleaning algae from roof
April 9th, 2015 | by Henri
Q. This past year, we noticed black markings coming down the roof. Would you have any idea what is causing
Bleach loses potency over time
April 15th, 2014 | by Henri
Q. In your advice about algae on a shingled roof, you mentioned to use fresh Clorox bleach. What do you
Aluminum flashing won’t protect against algae on roof
March 19th, 2014 | by Henri
Q. I have the black algae problem on my roof that you have mentioned on several occasions. I wonder if
Insurance company says to remove moss from shed roof
December 11th, 2013 | by Henri
Q. The insurance company said we have to get the moss off our shed roof by this coming October. She
Algae takes time to form, and to kill
September 5th, 2013 | by Henri
Q. I enjoy reading your informative column. The problem I’m having is with fungus on the shingles on the northern
Metal strips to control algae on roof
September 5th, 2013 | by Henri
Q. Somewhere on TV, probably in “This Old House”, was a gadget to inhibit the growth of lichens on roofs.
Why asphalt roofs turn black
August 15th, 2013 | by Henri
Q. I have noticed over the years that asphalt shingle roofs turn black — sometimes almost across the entire roof
Black streaks on roof
March 4th, 2013 | by Henri
Q. We have black streaks forming from bottom to top of our shingled roof. Mostly shady areas, but sunny also.
Bleach is safe to use on roof
February 7th, 2013 | by Henri
Q. Your reply to the person who wanted to remove lichen from a roof raises a question. I have used
Algae stains on roof
July 26th, 2012 | by Henri
Q. I have noticed, over a period of time, some ugly black stains on the roof of my 55-year-old Cape
Henri’s Books
Click cover image to order at Upper Access. Available in paperback or expanded e-book editions.