Visqueen Zedex Non-Combustible Damp Proof Course (DPC) achieves a reaction to fire classification A2 - s1, d0. The product is compliant with the requirements of The Building Regulations 2010 (England and Wales) (as amended) and The Building (Scotland) Regulations 2004 (as amended).

The DPC is a flexible 0.6mm composite damp proof course and cavity tray system. It is supplied in 20m length rolls and the following standard widths: 450mm, 500mm, 600mm, 700mm, 800mm and 900mm.

The DPC is coloured red on the upper surface and pale grey on the reverse and is installed with the red surface facing upwards or outwards i.e. facing towards the direction of moisture penetration.

The product is used where a DPC or DPC cavity tray is required that achieves a reaction to fire classification A2 - s1, d0 to BS EN 13501-1:2018.

In circumstances where the external wall construction consist of a masonry inner leaf e.g. blockwork, Visqueen Zedex Non- Combustible DPC can either be surface fixed or built in to the inner leaf. Please note that in accordance with Building Regulation Approved Document B, the requirement for a non-combustible DPC cavity tray does not apply to DPC cavity trays when used between two leaves of masonry.

Care should be taken by the Designer to ensure suitability for applications other than those stated above. Visqueen Zedex Non- Combustible DPC should be approved by all stakeholders prior to use.

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 (BDA certificate BAW-21-203-P-A-UK)
• UKCA CE Mark EN 14909:2012 Type A
• Compliant with UK Building Regulations
• Achieves a reaction to fire classification A2 - s1, d0 to BS EN 13501-1:2018 by Warrington Fire
• Shear strength tested to BS EN 1052-4:2000 Methods of test for masonry - Part 4
• Flexural mortar bond strength tested in accordance with DD 86-1:1983
• Quality Management System ISO 9001:2015
• Occupational Health and Safety System ISO 45001:2018
• Environmental Management System ISO 14001:2015

System Components

• Visqueen Zedex Mastic, 380ml
• Visqueen Non-Combustible Fixing Strip, 25mm x 1240mm
  • Lightweight - easy to handle
  • Flexible - can be bent to the required profile
  • Pre-drilled holes - speeds up installation on site
  • Manufactured as standard from stainless steel to BS EN 10088 grade 1.4301 (BS 1449 grade 304)
• Visqueen Non-Combustible Preformed Units
• Visqueen DPC Joint Support
  • Lightweight stainless steel profiles - easy to handle
  • Factory manufactured as standard from stainless steel to BS EN 10088 grade 1.4301 (BS 1449 grade 304) - available for any cavity tray profile
  • Maintains cavity tray profile - prevents sagging and water pooling in the cavity tray
  • Rigid support - ensures a solid substrate for the lap formation and ensures long term lap integrity

Storage and Handling

Visqueen Zedex Non-Combustible Damp Proof Course should be stored vertically, under cover in its original packaging. In these circumstances, the product has an unlimited shelf life.

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

Preparation

Visqueen Zedex Non-Combustible 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.

Visqueen Zedex Non-Combustible DPC must be installed with the red surface facing upwards or outwards i.e. facing towards the direction of moisture penetration.

When built into the outer leaf of a masonry wall construction the DPC should be installed on an even bed of fresh 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 fresh bed of mortar. 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 depending upon the type of wall construction.

When surface fixing the cavity tray, the DPC should be sealed to the inner leaf using Visqueen Zedex Mastic and permanently secured using Visqueen Non-Combustible Fixing Strip and stainless steel fixings suitable for the substrate. For typical sections see Visqueen drawings DPC-ZXNC-02 and DPC-ZXNC-03.

To simplify complex or awkward junctions e.g. corners, steel columns, changes of level, etc., an extensive range of Visqueen Non- Combustible Preformed Units are available.

All DPC to DPC laps, and DPC to Visqueen Non-Combustible Preformed Unit laps should be 100mm and sealed with Visqueen Zedex Mastic (refer to Visqueen Zedex Mastic datasheet). To ensure long term lap integrity, all laps should be fully supported and the support should remain in position. Unless formed over a permanent rigid supporting substrate, all laps should be formed with a Visqueen DPC Joint Support positioned directly beneath the lap. For typical joint support profiles see Visqueen drawing PFU-NC-660.

Minimum spacing between DPC to DPC laps should be 900mm, i.e. adjacent cavity tray laps to be spaced at least 900mm apart. Where such laps occur at less than 900mm, back to back stop ends should be considered.

There are no minimum spacing requirements between DPC to Visqueen Non-Combustible Preformed Unit laps.

Usable Temperature Range

It is recommended that Visqueen Zedex Non-Combustible Damp Proof Course and associated system components should not be installed below 5°C.

Additional Information

For surface fixing to structural framing systems see Visqueen drawings DPC-ZXNC-02 and DPC-ZXNC-03.

When cutting of master rolls is being undertaken e.g. using a lathe, please refer to the product material safety datasheet.

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