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Sikalastic®-1K MortarVendor:
Use Sikalastic-1K for flexible waterproofing and concrete protection. It provides crack-bridging ability up to 0.75 mm and resists negative pressure up to 2.5 bar for 72 hours, offering certified performance for drinking water contact and external membranes.- $213.07
- $213.07
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Gripset 2P Class II MembraneVendor:
Use Gripset 2P for critical waterproofing across internal/external wet areas, swimming pools, and potable water tanks. This two-part cementitious membrane is certified to AS/NZ 4020 for drinking water and provides Class II flexibility with fast re-coat times.- $188.44
- $188.44
- Unit price
- per
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Gripset C-1P Cementitious MembraneVendor:
Use Gripset C-1P for demanding waterproofing jobs, resisting up to 5 bar positive and 1.5 bar negative hydrostatic pressure. This flexible, fibre-reinforced cementitious membrane bridges cracks up to 0.75 mm and holds AS 40200 potable water approval.
- $166.30
- $166.30
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RLA 2 Part Cementitious MembraneVendor:RLAUse RLA 2 Part Cementitious Membrane for demanding immersion and potable water applications. This Class II flexible membrane is AS 4020 certified for drinking water and offers 214% elongation, ensuring a durable, compliant waterproof barrier under tiles.
- $251.23
- $251.23
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Frequently Asked Questions
What is a cementitious waterproofing membrane?
A cementitious waterproofing membrane is a polymer-modified cement coating that provides a rigid waterproof barrier. Unlike liquid membranes, cementitious membranes are not flexible and must be covered with tiles, screed, or backfill. They suit wet areas, pools, and tanks.
Can I apply a cementitious membrane inside a basement?
Yes. Gripset C-1P and Sikalastic-1K both resist negative water pressure and suit the inside face of retaining walls and basement slabs. Gripset C-1P resists 1.5 bar negative pressure. Sikalastic-1K resists 2.5 bar negative pressure.
Which cementitious membranes are safe for drinking water tanks?
Gripset C-1P, RLA 2 Part Cementitious, and Sikalastic-1K all hold AS 4020 approval for contact with potable water. Use them for concrete rainwater tanks and reservoirs. All three suit immersion service.
Do cementitious membranes bridge cracks in the substrate?
Gripset C-1P and Sikalastic-1K both bridge cracks up to 0.75 mm. Cementitious membranes rely on their polymer content for crack bridging. For wider crack movement, consider a Class III liquid membrane with higher elongation.
What is the difference between single-component and two-part cementitious membranes?
Single-component products such as Gripset C-1P and Sikalastic-1K mix with water only. Two-part products such as Gripset 2P and RLA 2 Part need a liquid polymer additive. Two-part membranes tile in 24 hours. Single-component products need longer immersion cure.