Impermeable Membranes For Attenuation

A critical component of any attenuation tank is a high-performance impermeable membrane. This specialised liner acts as an effective barrier, preventing water from infiltrating the surrounding soil and ensuring it remains safely contained within the tank.

Unlike permeable geotextiles used for drainage applications, impermeable membranes are specifically designed to be entirely watertight. They are constructed to retain water within a designated area or structure, preventing unwanted water ingress in other areas.

We offer two impermeable liner options to cater to your specific attenuation tank requirements:

Individual Impermeable Membranes: These membranes are ideal for projects where you can customise the tank size and shape or for particularly large systems that are too large for a pre-fabricated “shoebox” to be created. We offer various roll sizes and materials like LLDPE (Linear Low-Density Polyethylene) and polypropylene to suit your needs along with sundries such as “top hats” for pipe inlets/outlets and sealing tapes.
Pre-Fabricated Attenuation Tank Liners ("Shoeboxes"): For a complete and convenient solution, we offer pre-fabricated "shoebox" liners. These liners consist of two fabricated pieces that can be easily assembled on-site with “top hats” and sealing tapes to allow pipe inlets and outlets to be installed while retaining its ability to remain watertight.

Our pre-fabricated "shoebox" membranes are also supplied with a non-woven protector geotextile (protection fleece). This fleece is essential for wrapping the entire tank system before backfilling. It safeguards the impermeable liner from punctures caused by sharp objects in the backfill material, maintaining the system's integrity and functionality.

TCS GEOTECHNICS LEAD TIMES AND SURCHARGES

GEOTEXTILE MEMBRANE

Orange Geotextile: 3-7 Days, £110 Surcharge
Handypacks Non Woven: 2-5 Days, £110 Surcharge
Handypacks Woven: 2-5 Days, £55 Surcharge
Non Woven Mini Rolls: 2-5 Days, £55 Surcharge
Woven & Non-Woven Rolls: £10 Bulky Surcharge
Per Metre: Standard Delivery Charge

OTHER MEMBRANES

Terram Rootguard & Weedguard: 3-7 Days, £55 Surcharge
Terram Non Woven Geotextile: 3-7 Days, £110 Surcharge
Polypropylene Impermeable Membranes: 3-7 Days, £55 Surcharge
LLDPE Impermeable Membranes: 3-7 Days, £55 Surcharge
Impermeable Attenuation Shoeboxes: 5-10 days, £55 Surcharge
Impermeable Attenuation Membrane Rolls: 5-10 days, £110 Surcharge

GEOTEXTILE PROTECTION FLEECE

100m Roll - 3-7 Days, £110
50m Roll - 3-7 Days, £55

OTHER TCS RANGES

Flexible Tophat - 3-7 Days, Standard Delivery Charge
Joint Tape & Lap Tape - 3-7 Days, Standard Charge
Rainwater Diffusion Units - 3-7 Days
Gabion Baskets - 5-10 Days, surcharges explained below

DELIVERY OF TCS GEOTECHNICS PRODUCTS

All gabion baskets from TCS Geotechnics are subject to a delivery surcharge for every increment of 40 baskets ordered:
- £55 + VAT for small baskets
- £110 + VAT for medium baskets
- £150 + VAT for large baskets
- If multiple different sizes of gabion baskets are purchased, only the highest surcharge will be applied to the order
All order containing Terram rootguard and weedguard products are subject to a delivery surcharge of £30.

RETURNS OF TCS GEOTECHNICS PRODUCTS

Returns for TCS Geotechnics products must be arranged within 14 days of the original delivery date
Returns will refund 65% of the original invoice value with 35% being deducted to cover handling, QA and administration
Returned goods must be clean, undamaged and of merchantable quality with roll numbers identifiable
Please note that all gabion baskets from TCS Geotechnics are made to order and therefore cannot be returned

Impermeable Membranes For Attenuation

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TCS GEOTECHNICS LEAD TIMES AND SURCHARGES

DELIVERY OF TCS GEOTECHNICS PRODUCTS

RETURNS OF TCS GEOTECHNICS PRODUCTS