Roof underlay and ventilation
Choose the underlay to suit the roof: Wraptite-SA where the roof needs to be airtight, ProctorGeo Vap 120 or EcoDri FR for pitched roofs, and HC8 EnkaVent under metal roofing to let moisture drain and dry.
What goes into it
Choose how many of each to add to your basket, or work out quantities from your areas.
| Product | What it does | List price + GSTincl. GST | Per 100 m² | Quantity |
|---|---|---|---|---|
| ProctorPassive Wraptite-SA1500mm x 50m (75 m²) | Airtight, vapour permeable roof underlay | $1,957.82$1,702.45$26.10$22.70/m² | 2 rolls | |
| ProctorGeo Vap 1201500mm x 30m (45 m²) | Pitched roof underlay | $382.84$332.90$8.51$7.40/m² | 3 rolls | |
| EcoDri FR Underlay1250mm x 40m (50 m²) | Fire retardant roof underlay | $292.91$254.70$5.86$5.09/m² | 2 rolls | |
| ProctorPassive HC8 EnkaVent1020mm x 75m (76.5 m²) | Drainage and ventilation mat under metal roofing | $1,387.82$1,206.80$18.14$15.78/m² | 2 rolls | |
| Ceiling Batt R3.6 200mm12 m² pack | Insulating the ceiling (R3.2 or R3.6, or two layers for higher R-values) | $360.01$313.05$30.00$26.09/m² | 9 packs |
Per 100 m² uses each roll's coverage after laps where the manufacturer publishes it. Tapes depend on your openings, laps and penetrations; the estimator works these out from your numbers.
Other systems
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Airtight wall system Wraptite-SA wall wrap with tapes for openings, laps and junctions View system -
Windows and doors Flashing tapes to seal openings into the air barrier View system -
Open-joint rainscreen UV-stable membranes for cladding with open joints View system -
Internal airtightness and vapour control SmartVap on the warm side, taped at every lap View system -
Wool insulation NZ wool batts for ceilings, walls and floors View system