You have probably heard all the new fad “GO GREEN” “Biofoam” “Bio Degradable” “Eco-Friendly” roof cleaning pitches that have cropped up recently. Or the $$ making Roof-A-Side type programs, that keep guys walking on your roof once or twice a year to maintain clean appearances?

They try to convince unknowing homeowners that chlorine bleach should not be used on roofing to clean with.
The reason is, they know that chlorine is the industry standard and what the manufacturers allow roofs to be cleaned with under warranty.
However, there are many, many real professionals cleaning roofs properly with chlorine-per manufacturer instructions.

So, these new start up companies try to get work by telling lies about chlorine use. But you won’t see them posting a roofing manufacturer that suggests their chemicals or pressure washing, because none do.

It’s their way to fool you into thinking you are helping save the environment!
What is more damaging to the environment? – chlorine, which is everywhere and turns back into plain salt when it dries?
Or roofing shingles in dump sites, because they only lasted a 1/2 life, due to improper cleaning methods? DON’T BE FOOLED!

Here are the facts from The Roofing Manufacturers Themselves.

From GAF Roofing Manufacturers about black algae removal:

http://www.gaf.com/Documents/Algae_S…-43-808-v3.pdf

Below is a partial “cut and paste” excerpt from GAF on how to clean a roof:

“If a new roof is not an option, GAF recommends cleaning the roof with a special mixture. That mixture is:
4 gallons of water, 1 gallon of bleach and 1 cup of TSP”

“What NOT To Do! Do not power wash the shingles to clean the shingles. Some roof cleaning companies offer this service.
However, it is not recommended.”

From ARMA roofing manufacturers Association-how to clean roofing.

http://www.asphaltroofing.org/pdf/tb_217.pdf

Below is a partial excerpt cut and pasted below from ARMA:

Algae discolorations to remove from roofing surfaces, applying a solution of
chlorine bleach, trisodium phosphate, and water. Solutions for these ingredients depend on the amount of discoloration. Solutions range to one cup TSP and 2.5 gallons each of bleach and water.
First, gently disperse this solution on the roofing surface. Avoid scrubbing the surface, as this friction may loosen and remove granules.
Caution!
High pressure washing systems for algae removal should not be used.

Owens Corning Roofing manufacturers says the same thing:

“USE CHLORINE and TSP” “DO NOT USE A PRESSURE WASHER”

Owens Corning info in link below.

http://webapps.easy2.com/cm2/flash/g…ge_id=36077811

So, those who manufacture your roofing and warranty your roofing are the folks to listen to!

Not those who pressure wash roofs, or try to sell you a so called “Green” Eco-Friendly” chemical.
{ Incidentally, I am not against pressure cleaning! It is perfect for all exterior cleaning other than roofs. I have been a pressure washing contractor since 1978 – I just know better than to pressure clean fragile roofing ! }