The black mold like stains and streaks that appear on roofs particularly light colored asphalt shingles is actually a blue green algae gloeocapsa magma.
Why do i get the mold stain on roof.
Your best option for a base coat to cover water stains on the ceiling is an oil based mold resistant stain blocking primer in a shade closely matching that of the existing ceiling.
Hiring a professional to clean your roof.
A smoke stained ceiling sounds all cool and stuff and was probably misinterpreted as a legit style in the 70s but times have certainly changed and i can attest to that.
If the mold remains on the surface it will lead to ugly stains or black streaks.
Liquid based ceiling mold.
An undiscovered roof leak water draining into the foundation or debris gathering in a roof corner all create a nice moist place for mold spores to grow.
What you do is put it into a pump sprayer spray it on the roof and you need to keep the roof wet with the solution for about 10 or 15 minutes.
Not to speak of the potential liability involved from such a process.
There are a few possible causes of mold stains.
In our roof interior attic photo at left you can see antique roof framing along with black stains and probably some mold growth from a long history of roof leaks.
A roof with little direct sunlight that collects debris or has improper drainage increases risk of mold.
Commonly found in climates with warm humid summers it does no damage to the roofing but it certainly does looks bad.
The oxygen bleach starts to go ahead and attack the roof algae and it does its best to kill it and take away the stains.
If your household water pressure isn t enough to generate the proper nozzle pressure at the jets the manufacturer recommends boosting it.
Why anyone has to get on a roof and then run some machine pressure over it is beyond me.
These include roof leaks high humidity moisture and lack of ventilation.
With the proper ratio of cleaning solution lightly sprayed upon the roof let dwell for short period of time and then rinse with garden hose pressure will do the job.
The opposite is true for roof leaks pipe leaks etc.
Far more mold growth may be present on the backside of the sheet rock than the side facing the room.
If you don t want to climb around on a slippery roof or your shingle manufacturer will void your warranty if you try to clean your roof yourself you should contact a professional roof cleaning service to get rid of those ugly black algae stains on your roof.