Externally Applied Drainage Membrane

Q: What is a drainage membrane?

Drainage membranes are utilized as supplementary layers in various waterproofing systems, functioning as an anti-capillary obstruction in buried structures or drainage systems. The utilization of drainage membranes in walls offers the following benefits: swift and effortless installation.

Q: How long do water membranes last?

The reverse osmosis membrane on average should be replaced every 3-5 years, if it is still producing good quality water you may be able to keep it longer than five years.

HydroBond 410 GeoDrain

Effective Drainage Solution: Two-core drainage sheet with non-woven geotextile filter layer and water impermeable HDPE membrane provides efficient drainage for externally applied waterproofing systems, preventing water pressure buildup against the structure.
Chemical Resistance and Durability: Resistant to all chemicals found in groundwater, HydroBond 410 GeoDrain withstands stresses and movement, serving as a slip membrane during backfilling and ensuring long-term protection of the structure.
Easy Installation and High Strength: Quick and easy to install with a range of ancillary fixing and installation products, the material offers very high compressive strength and filters out suspended soil particles, minimising the risk of damage during backfilling even without protection board usage.

Two-core drainage sheet consisting of a non-woven geotextile filter layer thermally welded to a water impermeable HDPE (High Density Polyethylene) drainage membrane.

Key Benefits

Typical Applications

Technical Data

FAQ

Key Benefits

Prevents water pressure from bearing against the structure.
Resistant to all chemicals normally found in the ground.
Withstands stresses and movement acting as a slip membrane as the backfill settles.
Allows for backfilling with excavated earth.
Extremely strong material, minimising the risk of damage when backfilling even when no protection board is used.
Very high compressive strength.
Suspended soil particles (fines) are filtered out by the geotextile layer.
Quick and easy to install with a range of ancillary fixing and installation products.

Typical Applications

As the drainage layer of an externally applied waterproofing system when used in conjunction with sheet applied or liquid applied external tanking membrane to BS 8102:2022.
Protection of the structure from aggressive chemicals in the ground water.
To prevent the build up of ground water to retaining walls.

Technical Data

Installed Performance	Result
Thickness at 2kPa	11.3mm
Water flow (in plane)	3.50 l/m2/s
Water flow through Geotextile	350 l/m2/s
Compressive strength – Temporary loading	420 kPa
Water vapour diffusion resistance – Sd value	>604m
Water vapour diffusion resistance – µ value	>1208000µ
Water vapour diffusion resistance	>3020 MNs/g
Tensile strength (Machine direction)	15.4 kN/m2
Tensile strength (Cross direction)	16.8 kN/m2
Chemical resistance – Excellent	100%
Oxidation resistance – Excellent	100%

FAQ

What is a drainage membrane?

Drainage membranes are utilised as supplementary layers in various waterproofing systems, functioning as an anti-capillary obstruction in buried structures or drainage systems. Using drainage membranes in walls offers the following benefits: swift and effortless installation.

How long do water membranes last?

On average, it is recommended to replace the reverse osmosis membrane every 3-5 years. However, if the membrane continues to produce high-quality water, it could potentially be used for more than five years.