Tyvek Enercor - Product Attributes
Airspace
The airspace beneath Enecor Roof is fundamental to benefit from the product’s low emissive performance.
A non-ventilated cold roof void with insulation at joist level will provide a sufficient airspace for this purpose.
In the case of sloping ceilings, where the insulation is installed at rafter level, the optimum airspace is 25 mm.
Fixings
Enecor Roof should be fixed with stainless steel staples or corrosion resistant nails:
Horizontal fixing 600 mm centres • Vertical fixing 300 mm centres
Eaves carrier
Prior to the installation of Enecor Roof, fix Tyvek Eaves Carrier (or similar UV resistant material) over the fascia board/rafters and dress into the gutter. Secure Tyvek Eaves Carrier with galvanized clout nails.
Install the first run of Enecor Roof parallel to the eaves so that the leading edge laps onto the eaves carrier by a minimum of 150 mm. Install Enecor Roof over rafters or counter battens with the reflective side facing downwards.
The membrane shall be pulled taut to create a minimal drape.
A clear airspace of nominal 25 mm must be maintained beneath the membrane for thermal efficiency.
Laps & Tape
Laps - the upper run of Enecor Roof must overlap the lower
to prevent water from running behind the membrane.
All horizontal laps should be at least 150 mm and vertical laps 300 mm.
Tape -
The airtightness of Enecor Roof can be greatly improved by sealing all laps and penetrations with adhesive tape. Tyvek Metallised Tape (single sided) or Tyvek Butyl Tape (double sided) are recommended.
Penetrations, perimeters and abutments should also be sealed to ensure an effective vapour control layer and air leakage barrier.
Ridges
Form a 300 mm wide double strip of Enecor Roof over the centre line of the ridge.
Verges
Terminate Enecor Roof at the external face of the wall and secure with a timber batten or dress into mortar.
If a fascia board is specified turn the membrane up against the board 50 mm.
Hips
Enecor Roof should lap at least 300 mm down each side of the hip so that a 600 mm wide double layer is formed over the centre-line of the hip.
Valleys
Form a double layer of Enecor Roof beneath valley tiles or lay a separate strip of membrane directly onto
a support board beneath lead/GRP. Terminate the main roofing layer of Tyvek over the valley fillet/batten.
Abutments
Turn Enecor Roof up the face of the wall a minimum of 75 mm or terminate behind a lead flashing.
Where a secret gutter is used finish the membrane over the fixing batten.
Roof windows
Dress Enecor Roof around the roof window to drain surface water around the detail.
Upstands around windows should be 75 mm min. Follow window manufacturers instructions wherever possible.
Windows/doors
DuPontâ„¢ AirGuard should be made vapour and convection tight at all window and door openings, loft hatches, etc. The membrane should be sealed tight against the frame with Tyvek Butyl Tape or tucked in and compressed by the frame.
Penetration
Penetrations through DuPontâ„¢ AirGuard should be kept to a minimum and any that are made should be sealed.
Penetrations for pipework, wiring and ducting should be sealed with Tyvek Butyl Tape or Tyvek Metallised Tape.
Damage repair
Any damage that occurs in Enecor Roof should be made good as soon as possible. Minor damage
may be repaired with Tyvek Metallised Tape (single sided). More extensive damage should be covered with
a Tyvek Enercor patch. Large areas of damaged Tyvek should be replaced completely
Tyvek Enercor - Product Installation
Unsupported Applications (fig. 1 and 2)
Roof is installed with the metallised side facing the loft space. It is laid directly over the rafters and allowed to drape slightly for drainage beneath tiling battens. A non-ventilated airspace of nominal 25mm must be maintained between the membrane and the insulation to gain the full thermal benefit of the product‘s low emissivity surface. Counter battens will not be required in this application.
Over counter battens (fig. 3 and 4)
Roof can also be draped over counter battens that are installed over timber boarding or rigid insulation.
Sealed roof system (fig. 5 and 6)
Roof may also be installed in a fully supported condition with the low emissivity surface facing upwards and counter battens
fixed over. This method can be adopted where a sealed system is specified to improve the energy efficiency of the roof system.
All laps and penetrations in the membrane must be sealed with Tyvek Metallised Tape.