RenderProof 5 L is a powerful, BBA-approved waterproofing and plasticising additive designed to enhance cement renders following the installation of a damp-proof course. This highly concentrated formula minimizes the passage of water and salt, strengthens render workability, and ensures long-lasting protection in both internal and external applications.
When mixed into sand and cement, RenderProof reduces pore size within the render, preventing water ingress and the migration of damaging residual ground salts. At the same time, it maintains breathability—allowing warm, trapped moisture to escape and helping to preserve the structural integrity of rendered walls.
Key Benefits
Dual-action formula that waterproofs and acts as a plasticiser for improved render performance
Restricts moisture penetration and prevents salt damage to plaster finishes
BBA-approved for reliable and certified performance
Highly concentrated: 1 part RenderProof to 24 parts water, delivering efficient coverage
Vapour-permeable, letting walls breathe while providing protection
Suitable for all types of masonry in internal and external render use
Ideal Applications
Enhancing cement renders after applying a chemical damp-proof course
Protecting rendered surfaces from efflorescence in salt-prone areas
Ideal in restoration and renovation projects where moisture control is essential
Suitable for large-area renders on both modern and traditional masonry substrates
Mixing & Application Guidance
Mixing ratio: 1 part RenderProof to 24 parts clean gauging water
A 5 L container is sufficient for up to 120 L of gauging water used in standard sand-cement mixes
Apply to surface-dry walls only; ensure any damp or salt contamination is addressed beforehand
Allow a minimum drying period of 14 days before replastering or finishing rendered surfaces
Protect rendered walls from moisture, salt, and damp without compromising breathability or finish quality—RenderProof 5 L is your go-to additive for dependable and lasting render performance.