DPC cavity trays in cavity wall construction – don’t get caught out!

Did you know…

…contractors and housebuilders run the risk of failing to obtain National House Building Council (NHBC) Warranty on properties or developments if they don’t conform to cavity tray requirements

As of 1st January 2023, all plots starting or at Damp Proof Course (DPC) level are required to comply with NHBC Standards clause 6.1.17, by only using appropriate flexible DPCs and avoiding low-density polyethylene.

Cavity trays are used in masonry constructions to prevent the downward movement of water within a cavity and ensure that any water is deflected to the exterior of the building envelope. While not new, the guidance has been enforced by NHBC after finding that several sites were not following it correctly.

What NHBC has said

According to the Standards:

  • Flexible (plastic or rubber) DPC used as a cavity tray should be designed to prevent the downward passage of water or moisture through the tray.
  • Cavity trays should be provided at interruptions to the cavity (e.g. window and door openings
  • and air bricks) unless otherwise protected.
  • They must meet the requirements of BS EN 14909 and have a third-party certification that confirms their suitability for use as a cavity tray.
  • Manufacturer’s literature confirming their suitability for use as cavity trays should be readily available and recommendations for appropriate use and installation should be followed.
  • Low-density polyethylene DPC conforming to BS 6515 alone are no longer accepted as cavity trays.

IKO Hyload: a compliant and sustainable solution

To meet NHBC regulations and avoid project delays or expensive retrofits, contractors and housebuilders must cease using low-density polyethylene DPC cavity trays.

As construction’s trusted manufacturing partner, we are committed to helping merchants keep up with growing demand for products that align with this legislation.

IKO’s Hyload Original and IKO Hyload Trade are compliant, sustainable solutions verified by trusted certification body British Board of Agrément (BBA). They form part of the IKO Hyload DPC and Cavity Tray Systems range, a family of high performance, specialist damp proofing products.

Benefits include:

  • NHBC compliant. BBA certified for use as cavity tray, fully compliant with BS EN 14909.
  • More sustainable. Raw material for production contains a minimum of 75% of recycled content.
  • Tried, tested, and trusted. The first product to achieve BBA certification in 1967, IKO Hyload has a long-standing heritage in the construction industry.
  • Robust and durable. Effective for the design life of the building, resistant to impact damage, and does not extrude under compressive load, under normal working conditions.
  • Excellent flexibility. Even at low temperatures.
  • Developed components. Complete range of system components and preformed cloaks.
  • Sizes to suit every project. Available in a range of sizes, from 100mm to 1000mm wide.

What next?

For technical guidance on the IKO Hyload Range or to enquire about your stock profile and delivery frequency, get in touch with your local IKO Business Manager today.

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