Unlike roll DPC, self-supporting trays eliminate inner skin building-in and can be supplied ‘biased’ to take-up the cavity width encountered.
Compatibility and consistent protection.
Blockwork inner skin mortar beds every 225mm limit convenient building-in opportunities, whereas self-supporting trays do not – and can be packaged per dwelling.
If a drip lip is required to window and door heads in accordance with NHBC 6.1, a preformed tray can ensure it’s there, whereas roll DPC cannot.
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