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      The Grime Scene Terms Of Service and Forum Rules   08/23/2007

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Chuck Bergman PC

I have never seen anyone pressure washing a tile roof at 1200psi from 2 feet away?

Question

I have owned a pressure washing business since 1978 and here in Florida since 1989

That's how Monier says here to do it. I have a local competitor here, that claims that's how they clean tile.

I'd like to stick a psi gauge on their machine once! :-)

I never tried and don't plan to!

http://www.monierlifetile.com/technicaltools/pdf/15CleaningandMaintenance.pdf

{Since 1991 I have used Non Pressure Roof Cleaning. }

This is what I use-The manufacturer's suggested method and chemicals. Of course, they are telling a homeowner how to do it, so professional roof cleaners are going to vary the method and chemical mix some.

From GAF Roofing Manufacturers about black algae removal:

http://www.gaf.com/Documents/Algae_Staining_on_Shingled_Roof_Surfaces_-_Steep_Slope_Techn-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. { Note that they are suggesting up to 50% chlorine!}

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"

Corning info in link below.

Click Link, Go to "Do I need a New Roof" Then to "Algae growth" and read what the manufacturer says.

Owens Corning - Owens Corning™ Roofing Products Product Demo

Chuck Bergman Roof Cleaning and Pressure Washing

Charlotte & Sarasota County Florida Manufacturer Method Roof Cleaning Since 1991

Englewood 941-474-8883

Cape Haze, Placida, Rotonda, Grove City 941-698-1959

Venice, Nokomis, Osprey, South Sarasota 941-483-3673

Port Charlotte, Punta Gorda, PGI, Burnt Store 941-255-8600

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