Type DPC Profiles - Raft Construction / Ground Beam Cavity Trays - Cavity TraysType DPC Profiles - Raft Construction / Ground Beam Cavity Trays - Cavity Trays

Type DPC Profiles – Raft Construction / Ground Beam

  • One-piece DPC wall protection
  • Matches raft edge dimensions
  • Integrates with oversite membrane
  • Establishes gas protection provision

USE
The inboard section of the DPC extends 150mm minimum beyond the inside face of the internal skin to facilitate positive lapping and integration with any oversite membrane. (recommended) Raft cavity walls should drain below DPC and prevent water flooding cavities above DPC levels or crossing from the outside to the inside. A clear cavity descending 225mm below the inner skin/raft DPC level is required. Where foundations other than strip or trench fill are used, including those for timber framed dwellings, this may be reduced to 150mm minimum below DPC provided that weep holes and other measures where necessary, are taken to ensure that the cavity can drain.

Description

The inboard section of the DPC extends 150mm minimum beyond the inside face of the internal skin to facilitate positive lapping and integration with any oversite membrane. (recommended) Raft cavity walls should drain below DPC and prevent water flooding cavities above DPC levels or crossing from the outside to the inside. A clear cavity descending 225mm below the inner skin/raft DPC level is required. Where foundations other than strip or trench fill are used, including those for timber framed dwellings, this may be reduced to 150mm minimum below DPC provided that weep holes and other measures where necessary, are taken to ensure that the cavity can drain.

 

Solution
DPC Profiles for raft foundation construction are manufactured from accurately dimensioned semi-rigid shaped Petheleyne. They are bedded and lapped on the foundation prior to the commencement of masonry being laid. Unlike roll material, the DPC profile cannot not sag or distort and fulfils the requirements of NHBC 4.5 D12 –D13. The cranked DPC profile is manufactured in a range of heights corresponding with masonry course heights. Because there is no continuation of cavity by virtue of the concrete raft, water is drained out of the structure using caviweeps appropriately positioned in perp joints around the structure at DPC level.

Where to buy

Our cavity trays are available from suppliers up and down the country.

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