How to Repair a Membrane Roof


A membrane roof utilizes a rubber sheet to provide a waterproof coating to the roof. This membrane works well, preventing leakage as long as there are no tears or holes in the membrane. For this reason, care should be taken to prevent punctures when walking or working on a rubber membrane roof. Repairing or patching the membrane offers a more cost-effective way of repairing the roof than replacing the membrane.

Things You'll Need

  • Roof caulking
  • Roof tape
  • Household cleaner
  • Clean rag
  • Determine if the leak has caused damage to the roof sheeting. Check the underside of the roof sheeting from the attic space for signs of water damage in the interior. If the roof sheeting is damaged, the membrane will have to be removed to gain access to the sheeting that will also need to be replaced.

  • Clean the area around the leak or hole in the membrane. Use a household cleaner or alcohol to remove all dust and debris. Wipe the area with a clean rag.

  • Apply the roof tape to the area. Use a roller to apply weight to the entire area of the tape. Additionally, caulk can be used around the edge of the tape to provide a stronger adhesion to the roof.

  • Use duct tape as a repair tape on PVC roof membranes. Follow the same procedures for cleaning the roof before applying the duct tape to the tear or break.

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