A DPC should be provided behind a doorstep where it is higher than a wall DPC. a DPC, it should be lapped with the reveal DPC. For decades, the NHBC Standards have placed restrictions on the use of full fill cavity wall insulation in areas exposed to wind-driven rain, because of the risk of rain penetration from the outside to the inside of the wall. The concrete fill in a cavity wall should stop at least 225mm below the base DPC. weep holes should be provided at a maximum of 450mm intervals, each opening should have at least two weep holes. be in one continuous piece or have sealed or welded joints. The use of reputable and robust cavity barriers to compartment lines and around all openings is imperative. DPCs and flexible cavity trays should be of the correct dimensions to suit the detailed design. BRE was commissioned by NHBC Foundation and BRE Trust to investigate fire spread within combustible cavities.This project focused specifically on fire spread within external walls where the cavity between the external façade and the structural frame is incorporated either as a lining material or as a form of insulation (or both) combustible material. National House Building Council is registered in England and Wales under company number 320784. cavity barrier are compromised if any gaps are present or the assumed level of compression of the barrier is not provided. Horizontal cavity barriers (except under eaves) should be protected with a dpc tray. TENMAT’s Cavity Fire Barrier on a Roll is a low profile intumescent which provides material and labour cost savings compared to the traditional method of using Cavity Trays, Cavity Socks & Weep Holes. a DPC under the coping, and a DPC tray starting 150mm minimum above the roof, coping throating which is 40mm clear of the brickwork. To be installed using a dpc sheet material. open car ports and open porches. The product window and door openings and air bricks) unless otherwise protected (e.g. High load DPC should be used where it will be subject to a full storey of masonry. This page gives access to the Foundation’s full portfolio. NHBC is authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority. In cavity walls over openings, air bricks, etc. and the DPC should extend 150mm beyond each side of the bridge, where not otherwise protected (e.g. copings should comply with BS 5642 Parts 1 & 2. supported over the cavity to prevent sagging below copings, specified to achieve a good key with the mortar. be of a proprietary material assessed in accordance with Technical Requirement R3, or. At complicated junctions, clear drawings and the design should be provided, and preformed cavity trays used. News releases and guidance for media interests. A cavity tray should be provided 150mm above any adjoining roof or balcony surface. A cavity tray should be provided to direct any water that enters the cavity to the outside. NHBC's registered address is; NHBC House, Davy Avenue, Knowlhill, Milton Keynes, Bucks, MK5 8FP. At the horizontal abutment of all roofs over enclosed areas and balconies to walls. This should be undertaken only by a competent installer to ensure the correct protection is achieved. However, a bead of mastic should be used around openings. horizontal or preformed stepped cavity trays), 25mm of mortar below the DPC should also be raked out as the work proceeds to allow for the flashing to be tucked in. However, the same cavity barriers may be used for the compartmentation. New homes registered with NHBC are designed, specified and constructed in accordance with the NHBC Standards. 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