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.
Why do i get the mold stain on roof.
If the mold remains on the surface it will lead to ugly stains or black streaks.
A roof with little direct sunlight that collects debris or has improper drainage increases risk of mold.
Liquid based ceiling mold.
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.
Maybe i should start saying.
These include roof leaks high humidity moisture and lack of ventilation.
Not to speak of the potential liability involved from such a process.
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.
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.
Hiring a professional to clean your roof.
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.
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.
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.
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.
Commonly found in climates with warm humid summers it does no damage to the roofing but it certainly does looks bad.
A visual inspection of the backside of the ceiling is the only way to properly identify the extent of the mold growth.
Why anyone has to get on a roof and then run some machine pressure over it is beyond me.
If your household water pressure isn t enough to generate the proper nozzle pressure at the jets the manufacturer recommends boosting it.
Far more mold growth may be present on the backside of the sheet rock than the side facing the room.
Even in this case in our opinion the reasons to remove and replace roof sheathing and framing would normally be based on the condition of the roof framing and sheathing not on the.