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EPDM Roofing

EPDM Lap Sealant

EPDM Lap Sealant

Please click here to download a PDF version of this technical bulletin


DuoPly Lap Sealant is used in conjunction with EPDM roofing system. Primarily used for sealing exposed edges of EPDM membrane splices and sealing edges to perimeter walls.

Lap Sealants are extremely durable and their cured rubber consistency enables them to expand and contract with the EPDM membrane.

Features & Benefits

  • Cured rubber consistency
  • Able to expand and contract with the EPDM membrane
  • Mastic gun application
  • Coverage up to 6.7 linear metres per tube


1. All surfaces must be free of moisture, oil, dirt and other contaminants.

2. After seams are completed with proper splicing material apply a 8mm bead along the exposed edge of the membrane. Where sealing to a wall fill the chase with lap sealant and feather off the exposed bead.


1. Review the applicable Material Safety Data Sheet for complete safety information prior to use.

2. Lap Sealant is flammable. It contains solvents that are dangerous fire and explosion hazards when exposed to heat, flame or sparks. Store away from all sources of heat, flame or sparks. Do not smoke when applying. Do not use in a confined or unventilated area. Vapors are heavier than air and may travel along ground to a distant ignition source and flash back.

3. If swallowed, do not induce vomiting. Contact a doctor immediately.

4. Avoid contact with eyes. Safety glasses or goggles are recommended. If splashed in eyes, immediately flush eyes with water for at least 15 minutes. Contact a doctor immediately.

5. Avoid contact with skin. Wash your hands thoroughly after handling. In case of contact with skin, thoroughly wash affected area with soap and water.

6. Job site storage temperatures in excess of 32°C may affect shelf life.

Colour: Black
Solids: 65%
Flash Point: 4°C
Service Temp: -51°C to 82°C
Coverage: 6.7 l/m per tube

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Registered in England and Wales, Company Number: 03984573

Registered Office: Flex-R Ltd, Sandswood House, Hillbottom Road, Sands Industrial Estate, High Wycombe, Buckinghamshire, HP12 4HJ

Telephone: 0800 037 1240   Email: enq@duoply.co.uk