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RIW Sheetseal GR - Gas retardant membrane

RIW Sheetseal GR - Gas retardant membrane


Self-adhesive, damp-proofing, waterproofing and gas retardant membrane.

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+44 (0)1344 397777 www.riw.co.uk

RIW Sheetseal GR is a cold applied, high density polyethylene film bonded to aluminium foil and coated with a bitumen/ rubber self-adhesive layer with a removable reinforced silicone release paper. Typically used to reduce the passage of methane and carbon dioxide gasses on contaminated sites. The membrane must always be covered.

Joint laps:

Side and end laps minimum 150 mm are recommended.

General information


Methane and carbon dioxide barrier; Water and water vapour barrier; Factory controlled thickness; Elastic and flexible; Damage easily repaired; No drying time; Selvedge strip to improve lap sealing




1.05 x 19.05 m


RIW Limited’s waterproofing products will, subject to normal service conditions, provide an effective barrier to the transmission of liquid water and water vapour for the life of the building in which they are incorporated., The products must be installed in accordance with RIW written instructions, and following installation must not be subjected to any damage or long-term UV exposure

Uniclass 2015

Pr_25_57_08_08 Bitumen sheetsPrimary


J40/180 Self-adhesive bitumen gas retardant damp proofing/ tanking

J40/45 Self-adhesive bitumen gas retardant damp proofing/ tanking

Specification data - Bitumen sheets

Product Reference

RIW Sheetseal GR


Not required

RIW Sheetseal Primer

Used on all vertical or inclined substrates.

Standard product features


1.5 mm.

Water vapour transmission:

< 0.1 g/m²/24hr.

Methane gas permeability:

< 0.3 ml/m²/24hr.

Product Options


RIW Sheetseal primer is a bitumen solution.

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