Installation Guide

APPLICATION INSTRUCTIONS
GacoWash
Concentrated Cleaner
SURFACE PREPARATION
It is extremely important to get the roof clean and dry. First remove heavy deposits of dirt, leaves and other debris from the roof using
broom or air broomer, then inspect the entire roof surface and flashings for any open seams, tears, cuts, etc. Repair these flaws so water is
not blown in under membrane during the cleaning process. Pressure wash roof with water and allow to dry completely.
Biological Control: Areas of algae, mildew or fungus on the roof membrane or the existing coating should be treated with a solution of
1 part household bleach and 3 parts water, followed by a power washer rinse using clear water.
GACOWASH APPLICATION INSTRUCTIONS
For general cleaning, combine 1 part GacoWash Concentrated Cleaner with 9 parts water. Maximum coverage when mixed at that ratio is
4,000 sq. ft. per gallon. After the roof is completely dry from initial cleaning, apply GacoWash with a low pressure sprayer, using a
0.91-1.22 m (3-4 ft.) arc pattern. A Hudson-type agricultural sprayer, conventional pressure sprayer or airless sprayer is recommended. Allow
solution to stand for 10-15 minutes, adding a light mist of water to prevent drying. While it stands, lightly agitate any heavily soiled areas with
a broom or brush. Do not allow dirt to settle in low areas.
After application of cleaner, use a commercial power washer >3,000 psi (20.69 MPa) to remove debris and continue rinsing until all suds are
gone. Start at the lowest point of the roof and work towards the highest point. For low-sloped roofs, work away from and then back towards,
roof drains. It is important to keep the surface wet until all of the GacoWash and other residue has been completely rinsed off and the surface
is clean.
Drying: After cleaning and rinsing the roof, ensure no dirt or debris is present. Allow surfaces to thoroughly dry to prevent blistering.
Examine roof, paying particular attention to areas of physical damage to determine that residual water has in fact dried before applying
coating. Note: Drying time depends on weather conditions such as temperature, humidity and air movement.