Impermeable Membranes For Attenuation

A common use of soakaways is for attenuation where rainwater is held in a tank built from soakaway crates before it is discharged at a controlled rate. The slow rate of discharge enables local authorities to avoid downstream flooding and the erosion of waterways due to heavy flows.

One of the core components needed in an attenuation tank is an effective impermeable liner that ensures water is held in the tank and does not infiltrate out into the soil.

Impermeable Membranes

Unlike the permeable options, impermeable geotextile membranes do not allow any water to pass through them. They are used to retain water within an area or a structure, or to prevent water ingress into a specific area or structure.

We offer both individual components so that you can wrap the tanks yourself or pre-made shoeboxes as a complete solution for your attenuation needs.

The 'shoebox' designed tanks come in two fabricated pieces. The first piece is laid out in your excavation which fills the base and sides. The second piece is for the top with a small overlap down the sides.

These shoeboxes come with a non-woven protector geotextile (protection fleece) which must be wrapped around the whole system before backfill. This fleece will stop any sharp objects within the backfill from puncturing the liner and therefore deeming it unusable.

The individual membranes include LLDPE and Polypropylene in varying roll sizes.

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