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A ventilated batten used to form a cavity, allowing the free flow of air and moisture and assisting with effective ventilation of a roof cavity. Its cellular construction is nonconductive, capillary action resistant and dimensionally stable and assists with reducing thermal bridging. These battens are robust with a high compressive strength, so they are effective packers. They are not suitable for use as structural battens.
There is a growing understanding that unventilated cold roof spaces can result in excessive condensation with resulting wet insulation and framing timbers. This is well understood in many countries where ventilation in the roof space is seen as essential for dry framing, insulation performance and to reduce the corrosion risk to metal claddings or components.
Cold roof design is very common in New Zealand, the insulation is installed over the ceiling lining, and the roof cladding, underlay and support mesh rise and fall in temperature with sunshine hours and ambient external temperature. Very few residential or light commercial ceiling have a vapour blocker layer under the insulation to stop moisture diffusion into the roof attic space from the normal activities of occupants. Older down light designs also allow moisture to pass into the roof space. As the air in the attic space cools overnight or on cold days, moisture suspended in the air condenses out at the dew point and forms on the underside of the (cold- uninsulated) roof cladding. The roof underlay absorbs the condensation and releases it again back into the air in the attic roof space when the sun warms the roof cladding and attic space. If, however the moisture rich air in the attic roof space cannot escape, excessive condensation can form overwhelming the underlay and raining condensation onto the insulation and roof framing.
Masons Universal Ventilated Cavity Battens in 11 mm or 18 mm thickness may be used as part of a passive ventilated roof space design. Passive roof space ventilation makes uses the stack effect and wind movement to create air movement though the roof space carrying out moisture laden air.
Since being established in 1999, Masons has become a key supplier in the New Zealand building industry, offering a variety of quality systems and products for a whole range of building requirements.
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