Visqueen Pre Applied Membrane is a 1mm thick, robust co-extruded waterproofing membrane. It is coloured grey on the upper surface and black on the reverse. The grey surface is textured to aid adhesion to cast concrete.

The membrane is supplied in single would rolls (not folded), 2.44m x 41m.

The pre-applied membrane can be used to achieve waterproofing to Grades 1, 2 and 3 as defined in BS 8102:2022.

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

Approvals and Standards

• Third party accreditation (BDA BAF-18-057-P-A-UK)
• Suitable for use as a Type A Barrier Membrane (Tanking Membrane) to BS 8102:2022
• Conforms to the specification requirements of BR 211:2023
• CE Mark EN 13967:2012
• Quality Management System ISO 9001:2015

System Components

• Visqueen Ultimate Double Sided Jointing Tape, 100mm x 15m
• Visqueen GR Lap Tape, 150mm x 10m
• Visqueen Ultimate Retaining Discs, 50mm long x 35mm head diameter x 500 per box
• Visqueen Top Hat Units
• Visqueen Preformed Units - contact technical for more information on 0113 2455450 (option 2) or send a message to [email protected]
• VisqueenPro Detailing Strip, 300mm x 10m, 500mm x 10m
• Visqueen IGW5 and IGW10 Waterstops

Storage and Handling

Visqueen Pre Applied Membrane should be stored horizontally, under cover in its original packaging. Care should be taken when handling the product in line with current manual handling regulations.

Preparation

Visqueen Pre Applied Membrane should be installed on a smooth continuous surface e.g. compacted blinding layer, smooth concrete blinding or well consolidated MOT Type 1. The substrate should be free from irregularities such as voids or protrusions.

Where protection against hydrostatic water pressure is required, the membrane should be applied with welded joints.

The membrane can be cut with a sharp retractable safety knife or robust scissors.

Installation

Visqueen Pre Applied Membrane should be loose laid on horizontal substrates and pre-applied to vertical substrate with the grey textured side facing towards the wet cast concrete so that a key to the concrete can be achieved.

The membrane has been designed to exhibit superior welding properties using hot wedge, hot air or extrusion welding, therefore onsite welding of all lap joints is recommended for all applications, and should be employed when hydrostatic water pressure is present.

Alternatively, when the membrane is used for damp proofing, radon protection and sites where hydrostatic water pressure is of low risk, lap joints can be bonded with Visqueen Ultimate Double Sided Jointing Tape and then sealed with Visqueen GR Lap Tape.

When using tapes to secure laps, the overlap should be minimum 150mm and the membrane surfaces to be jointed should be dry and free from contamination such as dust or sand. Once the tapes are applied, the lap should be well rolled with a seam roller to ensure full adhesion and continuity.

The membrane should not be taken through any masonry wall. The relevant Visqueen damp proof or gas proof course should be taken through and extended beyond the wall by a minimum of 250mm where it can be jointed to the membrane with the above tapes.

When installed vertically, the membrane should be pre-applied to temporary formwork or the adjoining structure. Visqueen Retaining Discs are available to provide a means for securing the leading edge of the membrane to the temporary formwork. The membrane should be installed with the smooth black surface facing the formwork. Using oval nails, Visqueen Retaining Discs should be mechanically fixed at maximum 400mm centres to the internal face of the shuttering. Using a suitable power tool and 6mm drill bit to create a pilot hole in the membrane, it should be secured over the protruding section of the retaining disc. The top edge of the membrane should be trimmed to approximately 10mm below the top edge of the slab. Once the concrete has set, the oval nails should be removed by pulling through from the external face of the shuttering. When the temporary formwork is removed the Visqueen Retaining Discs should be visible on the external (smooth black) face of the membrane. Continuity of the membrane system with the damp or gas proof course is maintained using Visqueen Self Adhesive Membrane.

Visqueen Preformed Top Hat Units should be used for sealing service entry pipes. The base of the top hat and the upstand should be bonded using Visqueen Ultimate Double Sided Jointing Tape and sealed with Visqueen GR Lap Tape. The upstand should be secured with the supplied jubilee clip.

Forming an effective barrier to damp may give rise to complex three-dimensional detailing where, it is recommended that welded membrane or Visqueen Preformed Units are used e.g. corners. Alternatively Visqueen Pro Detailing Strip can be used to seal awkward junctions.

If the membrane is punctured or perforated a patch of the same material should be lapped at least 150mm beyond the limits of the puncture and, depending on the specified jointing method, either welded in position or bonded with Visqueen Ultimate Double Sided Jointing Tape and sealed with Visqueen GR Lap Tape. Alternatively a patch can be formed using Visqueen Pro Detailing Strip and lapped at least 150mm beyond the perimeter of the puncture.

Due to the robust nature of the product, the membrane can withstand normal on-site foot traffic and the activities associated with the laying of a reinforced concrete slab without the need for additional membrane protection. However, care should still be taken to ensure that the membrane is not punctured, stretched or displaced when applying the reinforced concrete.

In high temperatures conditions the membrane should be covered immediately after installation.

Usable Temperature Range

It is recommended that Visqueen Pre Applied Membrane and all associated system components should not be installed below 5°C.

Additional Information

Where required, Visqueen’s network of preferred installers can install the membrane and offer the client a fully warranted system.

When using Visqueen Pre Applied Membrane in an external waterproofing application hydrostatic pressure can be relieved by using Visqueen Protect&Drain.

To assist build sequencing, Visqueen Zedex CPT High Performance DPC is available for protection through the wall construction.

Visqueen Preformed Top Hat Units should be used at service pipe penetrations.

For internal and external corners Visqueen Preformed Corner Units are available see PFU-553.

To seal around steel columns use Visqueen Pro Detailing Strip.

For additional detailing information contact Rawlins Technical on 0113 2455450 (option 2) or send a message to [email protected].