O.T. preventing shingle mold black marks

Rkh · May 4, 2015

Here in the northern part of pa. Black marks & mold shows up on the north side of the house. There are no trees near the house, so is there anything you can do go prevent this?

Oldiron29 · May 4, 2015

I never tryed it but was told if you put some zinc coated flashing up under your ridge caps, with about an inch exposed. As it gets wet and runs down the roof it will stop mold and roof discoloing.

Hoenes · May 4, 2015

There must be something to the galvanized thing, because my roof is clean below all the roof penetrations on the north side. Everywhere else has black mold streaks. I've also heard that a copper cable, similar to a lighting rod cable, just below the ridge will work too. Might be a bit pricey though.

Richard G. · May 4, 2015

Anything with a galvanized coating on it at the ridge will prevent it.
BTDT.
Richard in NW SC

JohnDY · May 4, 2015

I got some wash at Home Depot that took care of the problem. don't remember the name but will get it if anyone interested.

showcrop · May 4, 2015

Any cleaner with phenolic disinfectant will keep it from growing for a few months. Get the wall clean spray the Phenolic product on, but don't rinse. It has residual germicidal activity which whenever it gets wet will kill whatever comes in contact with it, so nothing can grow.

TXZane · May 4, 2015

Old iron has it right. When I was working for a home builder he always had us put a roll of zinc under the ridge cap so that about an inch is exposed. It really worked well, even on houses built in the woods. Zinc might be hard to find now though. I work at a lumber yard and we can't get it. Shingles now come with zinc particles in them to prevent black mold.

Dave I Love My H · May 5, 2015

Hi! You may want to check your roof ventilation. Those shingles might be cooking from lack of airflow.
Dave

jeffcat · May 5, 2015

I had green mold growing on wood shingles. North side of shed and it looked yuk. Water and Clorox in pump sprayer did pretty darn good. Now if it starts up again, this time I will spray with water and some copper sulfate mixed in. THAT stuff is supposed to stop anything.

Rkh · May 5, 2015

Shingles are good on opposite side of house where sun hits it all day long.

showcrop · May 5, 2015

(quoted from post at 17:06:28 05/04/15) I never tryed it but was told if you put some zinc coated flashing up under your ridge caps, with about an inch exposed. As it gets wet and runs down the roof it will stop mold and roof discoloing.

Yes, that may be true, but the trick is to get that rain water that passed over the zinc coating onto the side wall of the house. :?

2510Paul · May 5, 2015

There is product specifically for this purpose. I have used it and it worked. Paul

2510Paul · May 5, 2015

Here is a link:

http://www.zincshield.com/home.html

I also Googled "preventing roof mold" and came up with a number of hits.

Paul

O.T. preventing shingle mold black marks

Rkh

Member

Oldiron29

Well-known Member

Hoenes

Member

Richard G.

Well-known Member

JohnDY

Member

showcrop

Well-known Member

TXZane

Member

Dave I Love My H

Member

jeffcat

Well-known Member

Rkh

Member

showcrop

Well-known Member

2510Paul

Well-known Member

2510Paul

Well-known Member

Similar threads