How to Fill a Low Spot in a Rubber Roof

Wait until no rain is predicted for at least two to three days before starting your rubber roof repair. In addition, outdoor temperatures between 65 to 75 F are ideal.

Walk around the rubber roof carefully and identify all low spots and circle them with a piece of chalk. Low spots are identifiable by looking for water rings where rainwater pools and then dries.

Open a tub of epoxy filler and, using a putty knife, scoop out 1 cup. Spread the epoxy over the low spots using the knife and leveling it off. To ensure it is even with the surrounding roof, overfill the low spot and then drag a wooden board across it to remove the excess.

Fill in any remaining low spots using the same method and then wait 24 hours to let the epoxy dry.

Fill a bucket with a gallon of water and 2 to 3 tablespoons of liquid soap. Scrub the entire rubber roof surface using a long-handled scrub brush to remove all debris and surface oil.

Rinse the rubber roof off using a garden hose and then wait until it dries completely.

Open a can of rubber roof patch liquid and pour out a fourth of it onto the roof surface. Spread the solution over the roof using a long-handled squeegee until it forms a 1/4-inch layer.

Switch to a long-handled paint roller with a short 1/4-inch nap and roll over the entire surface to level out the liquid.

Move to another portion of the roof and pour out another fourth of the can. Spread the liquid using the squeegee and the roller just as before.

Continue applying the rubber roofing in this manner, working your way back toward a door or a ladder.