£240.80 + VAT
GacoWash is recommended as a surface cleaner prior to applying:
Note: GacoWash is essential for surface preparation prior to coating over aged single-ply membranes and existing coatings.
Surface Preparation
Pressure wash or clean the roof first. Combine 9 parts water with 1 part GacoWash and mix thoroughly. Pour the diluted cleaner onto the roof surface and brush it to ensure all aspects are covered. Leave to stand for 15-20 minutes. When drying out, gently douse with water to prevent full drying of the GacoWash. After 15-20 minutes, wash away using hose or pressure washer. Ensure the roof surface is completely clean and free from dirt, grime, moss and algae.
Standard Cleaning: Mix 1 part GacoWash with 9 parts clean water
Heavy Cleaning: Use higher concentrations as needed
Max Coverage: Up to 4,000 ft²/gallon at 10:1 dilution
Do not mix GacoWash with chlorine-based products or other chemicals – dangerous gas may result.
Surface Preparation
Remove debris using a broom or power broom
Inspect roof and repair cuts, loose fasteners, sealant failures before cleaning
For biological growth, treat with 1:3 bleach-water solution before power washing
Apply with low-pressure sprayer in a 3–4 ft arc pattern
Allow solution to dwell for 10–15 minutes, misting to prevent drying
Agitate heavily soiled areas with brush or broom
Use a 3,000 psi commercial power washer to rinse thoroughly
Start at the highest point and rinse down; for flat roofs, clean away from drains, then back toward them
Allow the roof to dry completely before applying primer or topcoat
Inspect for leftover debris, soap residue, and dirt—repeat cleaning if necessary
Reapplication is only needed for heavily soiled or low-drainage sections
Dilution Ratio | Approximate Coverage |
1:9 (standard) | 400 ft² / gallon |
1:9 (maximum) | Up to 4,000 ft² / gallon |
Coverage may vary based on roof material, condition, and texture.
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