Cavity Closers - Weatherboard

We have a top and bottom Cavity Closer from extruded uPVC to be used in either a drained or ventilated cavity wall situation.

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Masons/Redway has designed a top and bottom Cavity Closer from extruded uPVC for either a Drained Cavity wall or Ventilated Cavity wall situation.

A drained cavity wall is vented at the bottom only. Water can drain and limited (but often sufficient) air can enter the cavity to dry the remaining moisture between wetting cycles.

Products required: Redway Weatherboard Starter/Cavity Closer.

A ventilated cavity wall is vented at the top and bottom. As per the drained cavity, the bottom vent allows drainage and air entry. This method should be considered when drying is inhibited due to rapid wetting cycles or where walls are permanently shaded, as they pose a higher risk of moisture build up and mould formation. An example detail of the ventilated cavity is illustrated on the right.

Products required: Redway Weatherboard Starter/Cavity Closer and Redway Top Vent Closer

MATERIALS

All Weatherboard Starters/Cavity Closers are manufactured from rigid uPVC and are supplied in 2.7m lengths.

All products are biologically and chemically resistant to treated materials such as treated timber. They will not rust nor react if in a salt zone.
The uPVC compound is stabilised for UV protection as required by the NZBC.
It is lightweight, allowing for easy transportation and installation.

WEATHERBOARD STARTER CAVITY CLOSER

The New Zealand Building Code section E2/AS1 (9.1.8.2) requires using a Cavity Closer as part of properly constructing a drained cavity wall. The function of the Weatherboard Starter / Cavity Closer is to provide support and the correct starter angle for the first course of weatherboard, prevent vermin intrusion, and to promote weather-tightness by allowing drainage and air ventilation to dry the cavity should moisture breach the external cladding.

The Masons/Redway range of uPVC Weatherboard Starters have been designed to provide the ideal solution for architects, builders and installers to meet these requirements. Redway Weatherboard Starters / Cavity Closers are available at all leading building merchants nationwide.

FEATURES

A preformed sloped edge to provide the correct angle for the first course of weatherboard.
The angled edge creates a tight and consistent seal with the weatherboard to prevent water from wicking up from the ground or from a sprinkler head. The tight seal also prevents vermin intrusion into the cavity. *Designers/builders must use the correct size weatherboard starter / cavity closer to achieve this seal and comply with the NZ Building Code.

• Ventilation holes to allow moisture drainage from the cavity. Bottom ventilation permits a minimum of 1000mm2 per metre length of air into the cavity as specified by E2/AS1. For enhanced drying capacity, use with the Top Vent Closer.

• Strong product thickness to provide weatherboard support.

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CANT STRIP/WEATHERBOARD STARTER (NO CAVITY)

When installing weatherboards without a cavity, fix the Redway Cant Strip (Weatherboard Starter) before the first course of weatherboard to achieve the correct angle and provide support for the weatherboard. This method saves time, money and materials when compared to ripping a piece of weatherboard as a starter.

The Cant Strip is manufactured from the same durable uPVC compound as other Redway flashings.

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