How to Repair a Bubble in a Roll of Top Roofing

Walk carefully over the roll roof surface and identify any bubbles. Circle all bubbled locations using a piece of chalk so that you may easily identify them later.

Sweep the bubbled areas gently with a broom to remove any of the mineral granules or rocks that have loosened. Gather the loosened material into a pile.

Kneel down next to the bubble and cut a 1-inch slit along the top center of it using a utility knife.

Open a tub of roofing cement and scoop up 1 to 2 tablespoons using a plastic putty knife. Lift up one half of the slit with your hand or a screwdriver shaft and gently slide the knife underneath it. Scrape the cement through the slit onto the roof.

Repeat the process to apply more roofing cement under the other side of the slit.

Spread additional cement around the repair site until it extends 2 inches beyond it on all sides. If needed, add additional cement from the tub to accomplish this.

Measure the length and width of the repair site and cut out a piece of roll roofing material that is the same size. Press the patch inside the slit as far as possible. Then press the slit down on top of the patch. Apply more roofing cement to the entire top of the repair site, including the slit and the patch.

Wait 10 minutes or until the cement begins to gel slightly. Scoop up the gravel or mineral bits you swept up earlier and press them on the top of the cement evenly to disguise the repair.