Combi-Seal
Application

Laid beneath concrete to provide a gas-proof and waterproof membrane in the construction of sub-structures, providing protection against hydrostatic water pressure and ground gases.

Description

A combination of Premcrete Maxiprufe Plus and Premcrete Hydroprufe 9000. This formulation is a lightweight, pre-applied, self-healing, gas-resistant membrane which will resist a hydrostatic head of water pressure. The polyethylene layer is reinforced with a 12 micron aluminium foil core which restricts the gas vapour transmission rate to less than 40 ml/m²/day in accordance with BS 8485:2015. The self-healing properties of the hydrophilic, water-reactive polymers secure the integrity of the membrane, which is unaffected by the presence of contaminants in the groundwater.

Features and benefits:

  • Lightweight-but-robust membrane.
  • Easily installed.
  • Highly tear-resistant.
  • Self-healing in the event of puncture.
  • Forms strong adhesive bond to concrete.
  • Self-gelling lap joints requiring no jointing tapes.

Applications:

Laid beneath concrete to provide a gas-proof and waterproof membrane in the construction of sub-structures, providing protection against hydrostatic water pressure and ground gases.

Ancillary components:

Can be used with the following to create a complete membrane solution:

  • Combi-Tape.
  • Twinseal Compound.

General information

Uniclass 2015

Pr_25_57_65_60 Plastics sheetsPrimary

CAWS

D21/350 Gas-retardant membrane

D21/38 Gas-retardant membrane

J40/120 Loose laid plastics or rubber sheet damp proofing

J40/130 Loose laid plastics or rubber sheet oversite damp proofing

J40/140 Loose laid plastics or rubber sheet gas retardant damp proofing

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Specification data - Plastics sheets Enhanced data

Product Reference

Combi-Seal

Standard product features

Thickness:

3 mm.

Roll size:

2 x 25 m.

Technical characteristics:

  • Maximum tensile strength, machine direction (MD) to DIN EN ISO 12311-2: 600 N/ 5 cm.
  • Maximum tensile strength, cross direction (CD) to DIN EN ISO 12311-2: 1100 N/ 5 cm.
  • Elongation at break MD to DIN EN ISO 12311-2: 90%.
  • Elongation at break CD to DIN EN ISO 12311-2: 80%.
  • Tear resistance MD to DIN EN 12310-1: 500 N.
  • Tear resistance CD to DIN EN 12310-1: 454 N.
  • Watertightness to DIN EN 1928 B: Pass.
  • Resistance to impact to DIN EN 12691: Pass.
  • Gas vapour transmission: 40 ml/m²/day.
  • Moisture/ vapour transmission rate: <0.01 g/m²/day.
  • Methane permeability: <0.1 ml/m²/day.

Third party certifications
  • 12/4957
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