Liquid Waterproofing Membrane
White-Knight
White-Knight is a versatile liquid roof waterproofing membrane that maintains, restores and upgrades the performance of single-ply, metal, asbestos or modified roof systems.
Benefiting from polyurethane technology, White-Knight can be specified as an ideal solution for asbestos encapsulation, where it can be used to coat an entire roof or in isolated areas as a repair material for maintenance applications.
For exceptional strength, this high-performance system is often used as a coating in conjunction with Garland’s GarMat fibreglass reinforcement.
Long service life
25+ years, BBA-assessed under normal service conditions · BBA 21/5954.
Tensile strength
1677 N/50mm (non-directional) · BS EN ISO 527-1 / 527-3.
Waterproofing
No leakage under a 60 kPa head · EN 1928 / EOTA TR-003.
Fire performance
BROOF(t4) · BS EN 13501-5.
UV & heat durability
1638 N/50mm retained after UV ageing (800 MJ/m²) · 1242 N/50mm after heat ageing (70°C, 200 days).
Substrate versatility
Cold, flame-free application over single-ply, metal, asphalt, asbestos-cement and modified-bitumen roofs.
Why Specify White-Knight?
Up to 25 Year Guarantee
Backed by a Single-Point Guarantee of up to 25 years, dependant on substrate, giving long-term confidence in the system’s performance.
BBA Certified
White-Knight holds BBA Agrément Certificate 19/5651, independently verifying its weathertightness, fire performance, wind uplift resistance and durability.
Chemical Resistance
The cured polyurethane membrane offers strong resistance to chemical exposure, making it suitable for demanding industrial and commercial environments.
Straightforward Application
Applied by brush, roller or spray in as little as two coats, White-Knight offers a fast, straightforward installation process with minimal disruption.
White-Knight Liquid Roof Waterproofing Membrane Build-Up
Applied in layers directly onto a prepared substrate, White-Knight builds into a fully bonded, seamless waterproofing system.
Primer
Treat and Prepare
Aqua-Primer, a two-component, water-based epoxy primer, is applied to concrete substrates at a rate of 200 g/m² to ensure strong, watertight adhesion of the membrane.
Base Coat
White-Knight, a one-component, moisture-activated polyurethane, is applied as the first coat at 0.7–0.9 kg/m².
Reinforcement
At upstands, joints, cracks and other points of potential weakness, GarMat fibreglass reinforcing mat is embedded into the wet base coat to reinforce seams and details.
Second Coat
A second coat of White-Knight is applied within 48 hours of the first, at 0.8–0.9 kg/m², bringing total consumption to 1.5–1.8 kg/m² and a minimum cured thickness of 0.95–1mm.
Top Coat
For accessible roofs, White-Knight Top Coat, a one-component, aliphatic polyurethane, is applied over the cured base system at 0.2–0.4 kg/m² in one to two coats, adding UV stability and surface protection.
Quick Reference
| Quick Reference | Details |
|---|---|
| System Type | Liquid-applied, moisture-activated polyurethane membrane |
| Cure Time | Rapid cure for fast return to service |
| Coverage Rate | 1.5 – 1.8 kg/m² total (base coat), 0.2–0.4 kg/m² (top coat) |
| Minimum Cured Thickness | 0.95 – 1mm |
| Number of Coats | Minimum 2 (base coat), plus top coat where specified |
| Application Method | Brush, roller or spray |
| Application Temperature | Above 5°C (air and substrate) |
| Roof Type | New and existing, flat (min. 1:80 fall) and pitched (min. 1:6 fall), limited access |
| Suitable Substrates | Concrete, mortar, fibre cement, metal, single-ply, asbestos, modified bitumen |
| Reinforcement | Dura-systems Grip Polyester Soft fleece |
| Fire classification | B(ROOF)(t4) — BS EN 13501-5:2016, tested to DD CEN/TS 1187:2012 |
| Certification | BBA Agrément certified |
| Guarantee Period | Up to 25 years, dependant on substrate |
Your next project starts here
Every project is supported by a dedicated Technical Manager, providing technical guidance from initial assessment through to specification and installation.
Proven results
across every sector.
See how we’ve helped organisations maximise building performance, delivering reliable protection and long-term value.
