The product may also be used as a reflective foil as part of a thermal control layer design for roof or wall. When installed as a thermal reflective foil an air gap of no less than 20 mm must be maintained between the white reflective surface and the cladding, insulation, or other layers of the roof or wall assembly.
The product is not absorbent or breathable and should not be considered a condensation control layer, the building designer must allow for sufficient passive and active ventilation to control condensation.
Special care must be taken when considering design of buildings containing swimming pools, open liquid containers, or moisture generating plant or processes. Such building uses need specific measures to manage condensation and moisture generated within the building. Masons White-Faced Foil may not be suitable for these specialised uses.
Where the designer intends the product to be a secondary drainage plane or line of defence against external moisture, then install horizontally with higher layers over lapping lower layers by at least 150 mm. For Vertical installation, laps should be at least 150 mm and taped with Masons 40 Below Platinum 60 or 75mm tape. Support any such design with hexagonal or safety mesh.
Installation
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Overlaps should be a minimum of 150 mm.
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Pull Masons White-Faced Foil taut when installing.
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Masons White-Faced Foil may be installed vertically
or horizontally. -
Maintain a minimum air space of 20 mm between Masons White-Faced Foil and the underside of the roof cladding
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If installed as a vapour barrier tape overlaps with Masons 60 or 75mm 40 Below Platinum flashing tape.
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Do not install under translucent or clear natural light openings in the roof.
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Fix the product to the framing at 300 mm intervals with suitable fixings for the framing type. See the NZ MRM code of practice regarding foils, and ASNZ 4200.2.1914. Ensure the fastenings are compatible with aluminium foil.
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Same day cover is strongly recommended.
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Care should be taken when installing the product in windy conditions due to the “sail’ effect.
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Any damaged product during installation requires replacement
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Masons White-Faced Foil should be installed by a Licensed Building Practitioner
Limitations or other considerations
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Not suitable for installation in open buildings of sheds with the sea spray zone of within 500m of the shoreline unless Masons White-Faced Foil is fully lined and enclosed.
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LOSP treated framing should be allowed to flash off thoroughly before installation of the product
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May not be installed under natural light openings
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Maximum UV exposure 14 days. Same day cover
strongly recommended. -
If installed without mesh observe the pitch/span limitations that can be found in Masons VHP Roof Underlays, or the NZ MRM Code of practice for self-supporting
roof underlays -
Masons White-Faced Foil is neither breathable nor absorbent. Condensation control through adequate ventilation design for the building intended use and the climatic zone is the responsibility of the building designer, and constructors.
Handling and Storage
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Handle and store with care to prevent damage.
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Store dry and away for UV exposure.
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Do not stack other products on top of the rolls.
