Video · Leaks & repairs
Patching an EPDM Seam with QuickSeam FormFlash
- EPDM
What this video shows
Elevate, the former Firestone Building Products, shows its QuickSeam FormFlash patch going over a splice-tape lap on a RubberGard EPDM roof. It's a manufacturer-correct look at the spot where EPDM roofs most often leak: seam intersections.
Key points
- EPDM patches are a peel-and-stick system: clean, prime, apply, then roll firmly. Skipping the primer is the most common DIY failure.
- Round the corners of every patch. Square corners lift first.
- Use EPDM-specific materials. Asphalt cements and many caulks either attack rubber or won't stick to it.
- Check the whole seam run, not just the wet spot. Old seams tend to fail in more than one place.
Products in this video
The products used or shown, or the closest match we could verify. Typical price ranges, not live prices.
EPDM flashing / patch membrane · $150–$250
Firestone (Elevate)Firestone QuickSeam FormFlash, 9 in. x 50 ft
- Chemistry
- Other
- Size
- 9 in. x 50 ft roll
- EPDM
Uncured EPDM flashing with a tape backing that stretches around corners, curbs and pipes. It's the material manufacturer-trained crews use on EPDM details and patch overlaps.
Read the fine print: It needs the matching EPDM primer and a seam roller, and the roll is far more than one repair needs. On a roof still under warranty, use the manufacturer's detail or a certified installer.
Best for: Pro-grade EPDM patches, inside and outside corners, and penetration flashing
Check price on Amazon for Firestone QuickSeam FormFlash, 9 in. x 50 ft (opens in new tab)Affiliate link — we may earn a commission at no extra cost to you. Coverage and specs are the manufacturer's stated figures. Disclosure
EPDM repair kit · $50–$110
QuestMarkQuestMark EPDM Roof Patch and Repair Kit
- Chemistry
- Other
- Size
- Kit
- EPDM
One box with what a proper peel-and-stick EPDM repair needs: wide flashing, cover strip, seam tape, T-joint covers, membrane cleaner and the hand tools. It's the right way to fix a rubber roof, not smearing tar on it.
Read the fine print: EPDM tape only holds on rubber that's been scrubbed free of chalk, and primed if the kit calls for it. Skip the prep and the patch peels. Never use asphalt cement on EPDM.
Best for: Punctures, open seams and small tears on EPDM rubber roofs
Check price on Amazon for QuestMark EPDM Roof Patch and Repair Kit (opens in new tab)Affiliate link — we may earn a commission at no extra cost to you. Coverage and specs are the manufacturer's stated figures. Disclosure
Utility knife · $12–$22
StanleyStanley 10-777 FatMax Locking Retractable Utility Knife
- Mod bit
- Built-up
- Rolled
- TPO
- PVC
- EPDM
- Spray foam
- Metal
- Silicone-coated
- Acrylic-coated
Cuts fabric, membrane, cover tape and failed sealant. A locking blade matters when you're pushing through tough roofing material.
Read the fine print: Add a pack of hook blades for cutting membrane from the top without slicing what's underneath, and change blades often.
Best for: Cutting fabric, membrane patches and old sealant
Check price on Amazon for Stanley 10-777 FatMax Locking Retractable Utility Knife (opens in new tab)Affiliate link — we may earn a commission at no extra cost to you. Coverage and specs are the manufacturer's stated figures. Disclosure
Read the full guide
Leaks & repairs How to repair flat roof flashing and seams Most flat-roof leaks start at the edges and joints, not in the middle of the sheet: wall and curb flashings, edge metal, pipe boots, pitch pans, drains and open seams. Small repairs follow one pattern: clean down to sound material, use a sealant and reinforcing fabric (or tape) that match the membrane, carry the repair a few inches past the damage, and re-secure any loose metal. Torch work, heat-welding, drain rings and edge-metal replacement belong to a licensed roofer.Video by Elevate EMEA, embedded from YouTube. The summary, key points and cautions on this page are our own; Elevate EMEA doesn't endorse TheFlatRoofPro.com or the products listed. Roofing work for hire generally requires a licensed roofing contractor.