Blocksil® is a revolutionary British made liquid waterproofing membrane that provides a high performance protective surface suitable for flat & contoured roofs in industrial, mass transportation and civic applications from hospitals and factories to docks and railway applications.

Blocksil® is a single-part liquid polymer compound and optional non-woven needled polyester fleece reinforcement, which combine to form a seamless membrane which adheres to all irregular contours and surfaces, bridging cracks and holes up to 50mm diameter, while maintaining excellent flexibility.

It won't shrink, it's solvent-free and you could drink the rainwater from it were you so inclined!

Very Technically Advanced

Blocksil® is so technically advanced that accelerated ageing tests have shown that it could have a lifespan of more than 100 years.

The specially formulated polymer is brushed on, or applied by roller or power roller. It is straightforward and safe to apply - only basic hand and eye protection are necessary - and dries to a "rain-free" stage in 3-4 hours (fully dry in 16 hours).

High Durability

This really is the ultimate coating. Unlike many other membrane coatings, Blocksil® is not affected by temperatures in the range from -60C up to +200C and remains completely flexible and supple whatever the conditions.

Blocksil® is unaffected by UV, has excellent resistance to dilute acids and alkalis and is designed to be perfect for dense industrial areas where the air can be heavily contaminated. It is ten times more vapour permeable than most other high tech membranes and 100 times more than bitumen based products - yet fully water repellent.

Key Features

• Forms a tightly adherent, seamless, permanently elastic, waterproof skin which follows the most complicated and irregular surface contours.
• Working temperature range is -60 degrees C to + 200 degrees C.
• Remains constantly pliable and supple at both high and low temperatures.
• Unaffected by UV and excellent resistance to dilute acids and alkalis.
• Very high vapour permeability and fully water repellent.
• Non-hygroscopic and will not support fungal growth.
• Extremely high fatigue resistance.
• When tested in accordance with B.S.476:Part3:1958 - achieved the designation of EXT.F.AB.
• BS6920 Test on Effect of Water Quality - satisfactory results for all 5 separate leaching tests.
• Halogen, VOC free and environmentally friendly.
• Very strong and its strength is independent of the substrate.
• Very high stress absorbing characteristics, and excellent recovery.
• Full RAL colour range.
• Fast, safe and easy to apply.
• It is a British-made Product.
• Technical Information
• Application:Power roller or brush
• Volume solids:100%
• Recommended thickness:1mm for each of 2 coats
• Coverage rate:2 litres per m2
• Drying time:Rain free in 3-4 hours
• Thinners / brush wash:Xylene
• VOC content:VOC free
• Application temperature:-5 to +60 degrees Celsius
• Approvals:DIN EN ISO 7783-2 - Water vapour permeability
• BS6920 - Test on effect of water quality
• BS476 Part 3 1958 - Surface spread of flame