Applying Overcoat to Felt

How to apply the Overcoat roofing system to a felt roof

Surface preparation

Any dirt, soil or other contaminants must be removed from the roof’s surface before installing the Overcoat system. After the initial cleaning, the surface should be power washed and rinsed to remove all residual dirt and contaminates after which the surface should be dried.

Fill any cracks or splits in the felt with Sharkseal multi-surface sealing adhesive and allow it to cure following the product application guide.

Applying the Overcoat

Overcoat can be applied in temperatures at 5 ºc and above. The surface area must be dry, and check the weather forecast for optimum temperatures and conditions.

Once the surface preparation has been completed you apply the Overcoat system with a standard roller or brush at a rate of approximately 1.2 kg per square metre. The Overcoat layer will become instantly watertight and can immediately withstand rainfall. After 24 hours the surface can take foot traffic and a full cure of the system will take around 7 days.

Uknown surfaces

If you have a roof unsure of the surface material, an adhesion test area should be completed. Apply Overcoat to a 250mm x 250mm area and allow 7 days for a complete cure. After the curing period is over, test the area by cutting a cross into the coating and applying tape to pull. If the Overcoat stays adhered then the test has been successful. Each test should be photographed or videoed before and after.