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BEVELBACK WEATHERBOARD CAVITY SYSTEM

1.0 General Information

1.1 Introduction

The Hermpac Bevelback and Rebated Bevelback Weatherboard Cavity System is a cavity-based external wall cladding system for residential and light commercial type buildings where domestic construction techniques are used.

The cladding system consists of horizontally fixed Hermpac Bevelback and Rebated Bevelback cedar weatherboards installed over cavity battens, flashings and accessories and is finished with a premium penetrating oil stain to Herman Pacific Limited specifications.

The system incorporates a primary and secondary means of weather resistance (first and second line of defence) against water penetration by separating the cladding from the external wall frame with an 18 mm drained cavity.

1.2

BRANZ Appraisal

The Hermpac Bevelback and Rebated Bevelback Weatherboard Cavity System has been appraised by BRANZ. Refer to Appraisal No. 663 (2009).

1.3

Hermpac Bevelback and Rebated Bevelback Weatherboards

Hermpac Bevelback and Rebated Bevelback weatherboards are manufactured from Canadian Coastal Western Red Cedar (Thuja plicata) and Canadian Coastal Yellow Cedar (Chamaecyparis nootkatensis).

The weatherboard lap and rebate profiles are in accordance with NZS 3617 and BRANZ Bulletin 411. The weatherboards are minimum 18.5 mm thick and are available in a range of widths and face profiles. They are supplied in 1.83 to 4.88 m lengths. Lengths outside of the general specification may be available by special contract.

1.4

Cavity Battens

The Hermpac Bevelback and Rebated Bevelback Weatherboard Cavity System uses either treated timber cavity battens or Cavibat polypropylene cavity battens to separate the weatherboards from the wall frame and form the cavity. Cavibat cavity battens can be installed horizontally over the wall framing to provide support for the weatherboards at fixings points, e.g. at window openings. Refer to www.cavibat.co.nz and BRANZ Appraisal No. 524 (2007) for full specifications.

First Edition

Published: September 2009

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