The long-established benefits of SikaProof®-A and SikaProof®-P can now go even further with the addition of our loose-laid damp-proofing membrane and gas barrier system – expertly designed for ground-level protection against the ingress of damp and naturally-occurring gases.

Sikaplan®-1650 DPM Gas Barrier can be used in conjunction with SikaProof®-A and SikaProof®-P to continue the gas protection at ground level.

Sikaplan®-1650 DPM Gas Barrier is a multi-layer, low-density polyethylene membrane, strengthened by a polypropylene reinforcing grid with an integral aluminium foil.

This damp-proofing membrane and gas barrier is used at ground level to protect the building against moisture, radon, methane and carbon dioxide from the ground.

Standards and approvals

The Sikaplan®-1650 DPM Gas Barrier is extensively tested to withstand the most aggressive of environments, and is approved to the following standards:

  • BS 8485:2015 + A1:2019 – Code of practice for the design of protective measures for methane and carbon dioxide ground gases for new buildings.
  • BR211 (2015) – Radon: Protective measures for new buildings.
  • Declaration of Performance (DoP)to EN 13967:2012.
  • BBA certificate number 20/5738.

Product installation

We recommend that the Sikaplan®-1650 DPM Gas Barrier is heat-welded by a qualified installer, but taping joints can be used if required. Sikaplan®-1650 DPM Gas Barrier should be overlapped by at least 100mm and always installed in accordance with BS 8485:2015 + A1:2019. Additional influences on the system should also be considered, such as hydrostatic conditions and suitable protection of the membrane itself.

If you would like us to recommend a specialist contractor, get in touch by calling 0800 292 2572 or by emailing

Additional protection

If your project requires additional protection from hydrocarbons and VOCs as well as ground gases we recommend the Sikaplan VOC Membrane range.

Available system components and accessories

  • Sikaplan®-1650 DPM Detailing Strip – A 300mm wide bituminous gas-proof and damp-proof sheet, composed of self-adhesive SBS polymer modified bitumen and an upper surface finish of aluminium foil, and release film. Used for gas-proofing and damp-proofing of ground structures where harmful ground gases are anticipated.
  • SikaProof® FixTape-50 – A double sided 50mm wide butyl strip for sealing lapped joints.
  • Sika® Drain 850 Geo – A 2.44m wide heavy-duty drainage and protection sheet to safeguard the membrane and provide a drainage pathway to a maintainable land drain, alleviating pore water pressure on the structure.