On 5/22/15 9:29 AM, bob haller wrote:
On Sunday, June 22, 2003 at 10:39:10 PM UTC-4, jim wrote:
Bill Clements wrote:

I have what appears to be mildew on the roof shingles
of my home. Any ideas on how to remove this ?

Thanks in advance......
how about a solution of bleach and water and spray it on.. it will kill
the mildew/mold......

NO NO NO NO NO! thebleach will permanetely damage the shingles!

Leave it be or buy a product specific for the mold.....

roofers can add some metal stips toprevent it from re growing.

its a effect of global warming


Many roofers use bleach, but others have stopped because it can discolor
shingles and kill plants below the eaves.

Some who have quit bleach swear by washing soda. Others say borax or
trisodium phosphate. When I happened to be on my roof, I sprinkled
baking soda on the moss, from a can similar to a Parmesan cheese jar. In
a few days, the moss was brown.

For a bigger job, I'd use borax in a garden sprayer. The general-purpose
solution is 2 tablespoons per quart of water. It dissolves best when
heated to about 140 degrees (steaming) on the stove. A bit of detergent
could help it soak in.

It would be nice if sprayer manufacturers would publish vertical
capability and gallons per minute. My one-gallon sprayer with a hose and
wand will spray 10 feet up. My one-hand sprayer will spray 15 feet up.