Newton HydroBond 2K-Flex – Flexible, Two-Component Bitumen Waterproofing Membrane
Newton HydroBond 2K-Flex is a radon-certified, flexible, two-component bitumen/rubber waterproofing coating engineered for the external waterproofing of earth-retaining structures such as basements, foundation walls and below-ground slabs.
Formed from a polymer-modified bitumen emulsion and reactive powder, HydroBond 2K-Flex reacts to create a thick, fully bonded, seamless waterproof barrier. It is designed to fill voids and bridge cracks/joints up to 5 mm, delivering durable protection against water ingress and ground gases.
The coating can be applied by trowel or airless spray, dries quickly to rain-fast condition, and exhibits excellent crack-bridging, flexibility and aggressive ground-water resistance. HydroBond 2K-Flex integrates with other HydroBond waterproofing components (such as HydroBond 403, HydroBond SA and drainage systems) to form a complete Type A external waterproofing system under BS 8102:2022.
Key Benefits
Radon gas certified flexible waterproof coating (bitumen/rubber)
Two-component mix gives fully bonded, seamless barrier
Highly flexible with >2 mm crack-bridging performance
Can fill irregularities and surface voids up to 5 mm
Quick-drying and rain-fast after short cure period
Solvent-free, non-toxic, odourless and non-flammable (no VOCs)
Adaptable application by trowel or spray
Compatible with HydroBond waterproofing systems and ancillary products
Typical Applications
External Type A waterproofing of retained walls and basements
Radon and groundwater protection in combination with sheet membranes
Waterproofing slab edges and foundation interfaces
Liquid applied membrane where sheet systems are difficult to place
Over uneven or difficult substrates where crack-bridging is required
Technical Data – Newton HydroBond 2K-Flex
| Property | Specification |
|---|---|
| Product Type | Two-component bitumen/rubber waterproofing membrane |
| Application | External Type A waterproofing |
| Certification | Radon gas certified |
| Colour | Black when cured |
| Packaging | 30 L (combined kit) |
| Recommended Thickness | 4 mm (cured two-coat system) |
| Crack Bridging | ≥ 2 mm (unreinforced) |
| Water Vapour Resistance (Sd) | ~26 m (approx.) |
| Water Vapour Resistance (µ) | ~6575 µ |
| Watertightness | W2A (0.075 N/mm²) |
| Reaction to Fire | Euroclass E |
| Application Temp | +5 °C to +30 °C |
| Mix Components | Bitumen emulsion + reactive powder |
| Coverage | Approx. 5.6 L/m² (varies with substrate) |
| Curing | Quick rain-fast finish |
| Substrate Suitability | Concrete, masonry (primed, prepared) |
| Ancillaries | HydroBond 2K-Flex Primer, HydroBond 2K-Flex Mesh |
| System Compatibility | HydroBond 403, SA, GeoDrain, etc. |
Frequently Asked Questions
What is HydroBond 2K-Flex used for?
HydroBond 2K-Flex is a two-component flexible waterproof coating used for external waterproofing of earth-retaining structures such as basements and foundation walls.
How is HydroBond 2K-Flex applied?
It is mixed on site and applied by trowel or airless spray to form a seamless barrier coating.
Does it require primer or mesh?
Yes — for best performance, substrate should be primed with HydroBond 2K-Flex Primer, and HydroBond 2K-Flex Mesh is used to reinforce the first coat when needed.
Can HydroBond 2K-Flex fill voids or cracks?
Yes — when applied at recommended thickness (e.g., two coats to 4 mm), it can fill and bridge voids, surface irregularities and cracks up to 5 mm.
Is it suitable for radon protection?
Yes — HydroBond 2K-Flex is radon gas certified and suitable for gas-resistant Type A waterproofing designs.
Newton Hydrobond 2K Flex Bituminous Waterproofing Coating - 30L
Returns accepted within 14 days and only with original packaging.
