The DPC can be site formed into built-in or surface fixed cavity trays to manage the downward passage of water in cavity wall applications. It can also prevent harmful ground gases from entering into the cavity, and is suitable for use as a gas DPC for NHBC Amber 1 conditions or where radon gas exists. The DPC can also be used on sleeper walls below a ground floor construction e.g. beam and block floor system.

Quick Links - Click To Jump To Section:

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

Approvals and Standards

• Third party accreditation (BBA 94/3059)
• Conforms to the specification requirements of NHBC Amber 1 applications
• Conforms to the specification requirements of BR 211:2015
• UKCA CE Mark EN 14909:2012 Type A
• Quality Management System ISO 9001:2015
• Occupational Health and Safety System ISO 45001:2018
• Environmental Management System ISO 14001:2015

System Components

• Visqueen Zedex Jointing Tape, 100mm x 15m
• Visqueen HP Tanking Primer, 5L
• Visqueen Zedex DPC Surface Fixing System
• Visqueen Preformed Units
• Visqueen DPC Joint Support
• VisqueenPro Detailing Strip, 300mm x 10m, 500mm x 10m

Storage and Handling

Visqueen Zedex CPT High Performance Damp Proof Course should be stored vertically, under cover in its original packaging.

Care should be taken when handling the product in line with current manual handling regulations.

Preparation

Visqueen Zedex CPT High Performance Damp Proof Course can be cut with a sharp retractable safety knife or robust scissors.

Installation

DPCs and DPC cavity trays systems to be designed and installed in accordance with the relevant sections of BS 8215:1991, PD 6697:2019 and BS 8000-3:2020.

When built into a masonry wall construction Visqueen Zedex CPT High Performance Damp Proof Course should be installed on an even bed of wet mortar, and any perforations in adjacent courses of masonry should be completely filled with mortar. To ensure mortar adhesion, as soon as possible after laying the DPC, lay at least one further course of masonry including a bed of mortar. If positioned on the sleeper walls below a suspended ground floor e.g. beam and block floor system, the DPC can be dry laid, however all sharp protrusions must be removed from the substrate. The DPC must extend through the full thickness of the masonry wall, including pointing, applied rendering or other facing materials.

When used as a site formed cavity tray, the DPC can be either built-in to the inner leaf or surface fixed to the cavity face of the inner leaf.

When surface fixing the cavity tray, the substrate should be primed with Visqueen HP Tanking Primer and allowed to dry. The DPC should be bonded to the inner leaf using Visqueen Zedex Jointing Tape and permanently secured using Visqueen Fixing Strip and fixing suitable for the substrate. Visqueen Fixing Pins for the rigid urethane foam insulation of a SFS substrate, and fixing pins for a masonry substrate are available.

When using a hammer tacker to secure the DPC to an OSB3 substrate of a timber frame construction, minimum 8mm shank austenitic stainless steel staples should be used at minimum 150mm centres.

To simplify complex or awkward junctions e.g. corners, changes of level, arch windows etc, an extensive range of Visqueen Preformed Units are available.

All DPC to DPC laps and DPC to Visqueen Preformed Unit laps should be a minimum of 100mm and bonded with Visqueen Zedex Jointing Tape.

Usable Temperature Range

It is recommended that Visqueen Zedex CPT High Performance Damp Proof Course and all associated system components should not be installed below 5°C.

Additional Information

Where a gas DPC conforming to the specification requirements of BS 8485:2015 + A1:2019 is required, use Visqueen Ultimate Gas Damp Proof Course.

For built-in internal and external corners Visqueen Zedex Preformed Units should be used see PFU-553 (90° unit) or PFU-501 (sloping unit)

For surface fixed internal and external corners Visqueen Zedex Preformed Units should be used see PFU-554 (90° unit) or PFU-502 (sloping unit)

Do NOT install the DPC on dry bedded mortar - must be bedded in wet mortar.

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