Variable-Sd vapour retarder for converting roofs from inside or outside
DELTA®-NOVAFLEXX changes its Sd value with the humidity of the air. The polyamide sheet responds selectively to humidity fluctuations. In extreme cases, the Sd value may drop from its original level of 5m to 0.2m across the entire surface or in certain places. The density of the material changes with the air humidity. As the latter increases, DELTA®-NOVAFLEXX becomes more permeable, and its vapour diffusion resistance declines. The sheet reduces the risk of condensate forming in the construction. For an airtight roof refurbishment, add the DELTA®-MAXX PLUS energy-saver membrane to DELTA®-NOVAFLEXX and you have a complete energy-saving roof.
Application of DELTA®-NOVAFLEXX Thanks to its highly robust and tear-resistant cloth, the installation of DELTA®-NOVAFLEXX is quick, safe, and cost-efficient. The new screen-printed surface supports precise and quick installation.
For converting a roof from the inside. DELTA®-NOVAFLEXX may be installed either parallel with or across the rafters. Fix it easily and cost-efficiently with staples or clout nails. Overlaps of DELTA®-NOVAFLEXX are sealed with DELTA®-MULTI BAND . The DELTA®-TIXX cartridge adhesive may be used to make airtight connections between the sheet and smooth surfaces in gable walls, interior purlins, chimneys, etc. On rough walls, seams are made with DELTA®-KOM BAND and contact bars or with DELTA®-LIQUIXX
For re-roofing or converting a roof from outside: Remove the roof covering and the old insulation. Cover any nails or screws protruding from the interior lining with an insulation panel. Otherwise, attach DELTA®-NOVAFLEXX directly to the interior lining: roll out along the gutter and across the rafters and fill in the rafter spaces without putting tension on the material. Fix along the rafters with espalier laths. Sheet overlap: 10cm. Seal seams with DELTA®-MULTI BAND or DELTA®-THAN plus espalier laths. Cut insulation to rafter space width (+ 1cm) and put in..
Technical data: DELTA®-NOVAFLEXX
Class E, EN 13501-1
150/130 N/5 cm DIN EN 12311
approx. 5 m in a dry and approx. 0.2 m in a humid environment