Visqueen Protect & Drain is a geocomposite void former comprising a cuspated high density polyethylene (HDPE) core, bonded to a nonwoven polypropylene geotextile filter membrane.

The product is supplied in rolls and available in the following three thicknesses; 6mm (970mm x 25m), 12mm (1m x 25m) and 25mm (900mm x 25m).

Typical applications include use as part of a groundwater management system for slab edges, retaining walls, basement walls and lift pit walls. Product selection should be based on the groundwater risks highlighted in the site ground investigation report.

When designing structural waterproofing in accordance with BS8102: 2009, it is advised to assume that groundwater will come to bear on the full height of the retaining structure at some point during its lifetime. Incorporating Visqueen Protect & Drain into the groundwater management design reduces the risk of a head of water forming against the structure.

Protect & Drain 25mm can also be used as a protection layer for externally applied ground gas Type A barrier membranes (tanking membranes). The void created should be continuous with the below slab ventilation or pressure relief system.

Quick Links - Click To Jump To Section:

   
• Approvals and Standards
• Storage and Handling
• Preparation
• Installation
• Usable Temperature Range
• Additional Information

Approvals and Standards

• Quality Management System ISO 9001:2015

Storage and Handling

Visqueen Protect & Drain should be stored on end, under cover in the original packaging. Care should be taken when handling the product in line with current manual handling regulations.

Preparation

Visqueen Protect & Drain can be cut with a sharp retractable safety knife.

Installation

Visqueen Protect & Drain is designed to be installed with the geotextile filter membrane facing the direction of the water flow i.e facing towards the backfill.

Unroll into position. The product can be installed as a series of abutting strips running across the face of the vertical substrate e.g. starting at the bottom and running left to right, or installed vertically on the substrate e.g. top to bottom.

The strips can be temporarily held in position using VisqueenPro Double Sided Jointing Tape.

The geotextile filter membrane extends beyond the width of the dimpled HDPE core at one side; this creates an overlap flap which should be secured to the adjacent strip with VisqueenPro Detailing Strip. Seal perimeter edges of installation with VisqueenPro Detailing Strip to prevent ingress of fines/soil.

Service pipe penetration should be sealed with VisqueenPro Detailing Strip.

In accordance with BS 8102:2009, the system should be connected to a maintainable land drain system designed by a drainage engineer.

As the product provides a conduit for groundwater to reach the perforated land drain pipe, continuity between the two must be achieved, e.g. wrap the product around the pipe so that the geotextile filter membrane is in contact with the pipe, or peel sufficient geotextile filter membrane from the HDPE core to wrap over the pipe and extend the HDPE core under the pipe. Other detailing is acceptable provided that the groundwater can readily flow from the Protect & Drain into the maintainable land drain system.

Backfill material must be free from any sharp objects or debris which might otherwise damage the geotextile filter membrane. Angular fill or fill containing aggregate larger than 50mm diameter is unsuitable.

Usable Temperature Range

There are no temperature range restrictions for installing Visqueen Protect & Drain however it is recommended that the associated system components should not be installed below 5°C.

Additional Information

For guidance on the correct specification and detailing contact Rawlins Technical on 0113 2455450 (option 2) or send a message to [email protected].