Newton Geodrain   External Drained Waterproofing System with bonded Geotex – capped with Geoprofile

Newton Geodrain comprises of a 6mm stud Cavity Drain Membrane with Geotex a filter fabric thermally welded to the studded face. The filter fabric allows water to pass into the cavity created by the 6mm studs, but will not allow fines or sediments to pass into the cavity. Any water entering the cavity immediately de-pressurises and falls down to the perforated pipe (land drain or French drain) situated below floor level which in turn drains the water away to a suitable drainage point. The filter fabric should continue around the perforated pipe protecting it from fines and sediments also.

Three reasons to chose Geodrain

1. Advanced techniques ensure the Geotex is securely ‘welded’ to the cavity membrane.

2. Flexibility and strength provided by high quality polypropylene.

3. Rapid and easy application.

Introduction

THE PROBLEM

Waterproofing new build cellars and basements has always been a difficult proposition. Conventional barrier tanking will fail unless the barrier is 100% defect free. In a recent landmark judgment (Outwing – v – Thomas Wetherald) it was argued that it is unreasonable for the system to be 100% defect free. A barrier system that is not 100% defect free will fail if subjected to water pressure from the surrounding ground. Even a land drain cannot effectively deal with perched or trapped water higher up against the retaining wall. With the rise in local water tables, more and more basements are being subjected to hydrostatic pressure – do you want your project to fail the test?

THE SOLUTION

Newton Geodrain is a cavity drain membrane system specifically designed to meet the requirements of BS 8102 – The British Standard for the waterproofing of structures below the ground. BS8102 recognises that type ‘C’ drained protection is the least likely to fail of all methods of structural waterproofing. Take away the water – Take away the risk. By removing water at source, the structure will not be subjected to the cause of basement flooding – water under hydrostatic pressure. Newton Geodrain is strong and flexible and is so quick to install, a large basement can be waterproofed in just one day. The welded filter fabric is more secure and will not de-bond as easily as ‘cheaper’ glued alternatives

Newton Geoprofile caps the Geodrain at the top of the retaining wall to give a neat and tidy finish to the installation.

Application - typical basement construction

Newton Geodrain can be installed to walls only (Fig. 1.)
or to walls and under slab (Fig 2.).

The full installation shown in Fig. 2 is preferred. By continuing the Geodrain under the new slab and up the retaining walls, the whole structure can benefit from the drainage provided by the system. Also, with the full installation the perforated pipe is fully isolated behind the Geotex filter fabric. If all the Geotex where to silt up a perfectly sealed barrier would result. In this installation Geodrain really is the only failsafe method of external waterproofing below the ground. By wrapping the Geotex around the perforated pipe as in Fig. 1. The surface area of the filter fabric is greatly increased over normal footing drain installations leading to a much increased lifespan of the footing drain.

ADVICE ON APPLICATION

1. A fillet should be formed where the basement wall meets the footing.
2. External walls should be damp-proofed with a paint on bitumen based product prior to installation of the Geodrain.
3. Geodrain should be fixed in the top row of studs at 250mm centres.
4. Place footing drain 200mm below basement floor level.
5. Geoprofile should be used to cap the top of the membrane at ground level.
6. Extra Geotex fabric will be required for wrapping of the perforated pipe.
7. Protect the Geodrain with backfill protection board.
8. Use a well drained backfill, and protect the backfill with Geotex filter fabric.
9. Slope ground away from retaining wall where possible or drain well.
10. Allowance should be made for an inspection chamber at each corner, connected to efficient outlets to remove drained water

For detailed fixing instructions please refer to our installation manual.

Geodrain Technical Specification

Unit - Roll - Width (m) 2.00 - Length (m) 15.00 - Area m² 30.00
Colour Black
Raw Material Polypropylene
Studs 1796 /m²
Drainage volume ~4.5 litres / m²
Weight 105 g/m²
Membrane thickness 0.50 mm
Stud Height 6.00 mm
Weight 0.53 kg/ m²
Vapour permeability resistance (SS 021582) 10x10 s/m
Compressive strength (SPF WS 2200) >310kN/m²
Tensile strength (ISO 527 MD*) 44MPa
Elongation at break 780%
Application temperature range -40ºC to +80ºC
Vicat softening temperature 184ºC

*MD = Machine Direction

Geotex - sold separately 2m x 5m roll to wrap around drains

Unit - Roll - Width (m) 2.00 - Length (m) 5.00 - Area m² 10.00
Strip tensile strength (EN ISO 10319) 7.5 kN/m
Grab tensile strength (ASTM D 4633) 475 N
Elongation at max. load (EN ISO 19319) 75%
Puncture resistance (EN ISO 12236) 1175 N
Water permeability normal to plane (E DIN 60500/7) 260 L/m²
Weight 105 g/m²

Geoprofile - sold separately to cap Geodrain

Unit - Strip - Length (m) 2.00

Newton Geodrain Associated Fixing Products (Click)