08000 322 122
United Kingdom
1800 322 122
Republic of Ireland

Flat roof: timber deck

Design and Installation

When installing Quinn Therm QRFR boards to a timber deck an AVCL should be laid over the deck with 150mm sealed laps, turned up at any vertical upstand. The AVCL should consist of minimum 1000 gauge (250μm) polyethylene sheet.

  1. Roof joists
  2. Timber deck
  3. AVCL
  4. QRFR boards
  5. Waterproofing layer
  6. QRFR boards