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Everflex VBS Water-based Epoxy PrimerVendor:
Use Everflex VBS as a 2-part water-based epoxy primer and negative pressure vapour barrier for damp or green concrete. It withstands up to 25m (250 kPa) hydrostatic pressure and allows overcoating in 4-24 hours, preventing moisture-related system failures and accelerating project timelines.- $440.44
- $440.44
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Megapoxy HVendor:
Use Megapoxy H for high-strength concrete and steel repairs, especially where potable water contact or wet conditions are present. Its AS/NZS 4020:2018 compliance and hydrophilic properties ensure performance and peace of mind in critical infrastructure applications.- From $193.22
- From $193.22
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Gripset C-PlugVendor:
Use Gripset C-PLUG to instantly stop active water leaks in concrete and masonry. It sets in 30-60 seconds, cures to 35 MPa, and is safe for potable water.- From $51.96
- From $51.96
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Gripset E-60 Epoxy PrimerVendor:
Use Gripset E-60 as a two-component epoxy primer and moisture barrier for concrete and masonry. It withstands up to 2.5 bar hydrostatic pressure, applies to damp and green concrete, and is AS 4020 compliant for potable water.
- From $106.24
- From $106.24
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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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Mapei Lamposilex (Waterplug)Vendor:
Use Mapei Lamposilex to instantly stop active water leaks in concrete and masonry. It sets in 90 seconds, withstands pressurised water, and is AS/NZS 4020:2018 certified for potable water contact.- From $49.53
- From $49.53
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Mountain Grout Gel FoamVendor:Green Mountain InternationalUse Mountain Grout Gel Foam for active water leak repairs in concrete. Its hydrophilic chemistry ensures up to 25 times expansion and high elongation for durable, flexible seals, especially under continuous water exposure.
- From $187.62
- From $187.62
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Mountain Grout FlexibleVendor:Green Mountain InternationalUse Mountain Grout Flexible for permanent crack sealing in concrete infrastructure. This hydrophobic polyurethane expands up to 30 times into a closed-cell foam, remaining flexible (44% elongation) and resistant to wet/dry cycles without shrinkage.
- From $187.62
- From $187.62
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Mountain Grout UltraVendor:Green Mountain InternationalUse Mountain Grout Flexible for permanent crack sealing in concrete infrastructure. This hydrophobic polyurethane expands up to 30 times into a closed-cell foam, remaining flexible (44% elongation) and resistant to wet/dry cycles without shrinkage.
- From $187.62
- From $187.62
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Frequently Asked Questions
What is negative-side waterproofing?
Waterproofing applied to the surface opposite the water, typically the interior of a basement wall or slab where the exterior cannot be reached. It blocks water pressure pushing through the concrete from behind.
When is negative waterproofing the only option?
When the water-facing side is out of reach. An existing basement against a boundary, a retaining wall backfilled with earth, or a tunnel. The waterproofing must hold from the dry side.
What products are used for negative waterproofing?
Cementitious membranes like Gripset C-1P, moisture-barrier primers like Ardex WPM 300, Everflex VBS and Gripset E-60, rapid-set water plugs like Gripset C-Plug and Mapei Lamposilex, and crack-injection resins from Mountain Grout. The choice depends on whether the wall is weeping, cracked or damp.
Does negative waterproofing hold under high water pressure?
It holds where the product is rated for the pressure and the substrate is sound. Negative-side systems rely on bond and penetration into the concrete. They are less forgiving than positive-side membranes under sustained hydrostatic head. Follow the product rating.
How does crack injection relate to negative waterproofing?
Crack injection is the main negative-side technique for a cracked, leaking basement wall. The resin is injected from the interior to seal the crack against water passage. It is often combined with a negative membrane over the rest of the wall.
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