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Appraisal number: 663 (2020)

Date issued: 27 May 2020

Hermpac Bevelback and Rebated Bevelback Weatherboard Cavity System

Description

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

The system consists of horizontally fixed Hermpac bevelback and rebated bevelback weatherboards, cavity battens, flashings and accessories and is finished with a premium penetrating oil, stain or exterior paint system to Hermpac 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 a minimum 18 mm drained cavity.

Scope

The Hermpac Bevelback and Rebated Bevelback Weatherboard Cavity System incorporating oil or stain-finished cedar and DuraLarch weatherboards and paint finished DuraLarch and AshinDura weatherboards has been appraised as an external wall cladding system for buildings within the following scope:

  • The scope limitations of NZBC Acceptable System E2/AS1 paragraph 1.1.
  • Constructed with timber framing complying with the NZBC.
  • With a risk score of 0-20 calculated in accordance with NZBC Acceptable Solution E2/AS1 Table 2.
  • Situated in NZS 3604 wind zones up to and including extra high.

The Hermpac Bevelback and Rebated Bevelback Weatherboard Cavity System incorporating oil or stain-finished weatherboards has also been appraised for weathertightness and structural wind loading when used as an external wall cladding system for buildings within the following scope:

  • The scope limitations of NZBC Acceptable Solution E2/AS1 paragraph 1.1 with regards to building height and floor plan area.
  • Constructed with timber framing subject to specific engineering design.
  • Situated in specific design wind pressures up to a maximum design differential ultimate limit state (ULS) of 2.5 kPa.

The Hermpac Bevelback and Rebated Bevelback Weatherboard Cavity System incorporating paint-finished cedar weatherboards has been appraised as an external wall cladding system for buildings within the following scope:

  • The scope limitations of NZBC Acceptable System E2/AS1 paragraph 1.1.
  • Constructed with timber framing complying with the NZBC.
  • With a risk score of 0-20 calculated in accordance with NZBC Acceptable Solution E2/AS1 Table 2.
  • Situated in NZS 3604 wind zones up to and including medium when studs are at maximum 600 mm centres and NZS 3604 wind zones up to and including very high when studs are at maximum 400 mm centres.

The Hermpac Bevelback and Rebated Bevelback Weatherboard Cavity System must only be installed horizontally on vertical, flat surfaces.

The Hermpac Bevelback and Rebated Bevelback Weatherboard Cavity System is appraised for use with aluminium window and door joinery that is installed with vertical jambs and horizontal heads and sills. (The Appraisal of the Hermpac Bevelback and Rebated Bevelback Weatherboard Cavity System relies on the joinery meeting the requirements of NZS 4211 for the relevant wind zone or wind pressure.)

Technical literature

  • Hermpac Bevelback and Rebated Bevelback Weatherboard Cavity System Installation Specification, June 2017
  • HC BEVEL 100 Bevelback Weatherboard System Profiles, 18/10/2017
  • HC BEVEL 101 Trim and moulding profiles, 18/10/2017
  • HC BEVEL 200 Window head detail, Aluminium Joinery, 18/10/2017
  • HC BEVEL 201 Window Sill Detail, Aluminium Joinery, 18/10/2017
  • HC BEVEL 202 Window Jamb Detail, Aluminium Joinery, 18/10/2017
  • HC BEVEL 210 Door Head Detail, Aluminium Joinery, 18/10/2017
  • HC BEVEL 211 Door Sill Detail, Aluminium Joinery, 18/10/2017
  • HC BEVEL 212 Door Jamb Detail, Aluminium Joinery, 18/10/2017
  • HC BEVEL 300 Internal Corner HP110, 18/10/2017
  • HC BEVEL 301 Internal Corner Scribed, 18/10/2017
  • HC BEVEL 302 Internal Corner Boxed, 18/10/2017
  • HC BEVEL 303 Enclosed Deck Balustrade to Wall Junction, 18/10/2017
  • HC BEVEL 400 External Corner Boxed, 18/10/2017
  • HC BEVEL 401 External Corner Soaker, 18/10/2017
  • HC BEVEL 410 General Detail Cavity Fix, Stain Finish, 18/10/2017
  • HC BEVEL 411 General Detail Cavity Fix, Paint Finish, 18/10/2017
  • HC BEVEL 412 Drained Inter Storey Joint, 18/10/2017
  • HC BEVEL 413 Scarf Join Stain Finish, 18/10/2017
  • HC BEVEL 500 Base of Wall, Concrete, 18/10/2017
  • HC BEVEL 501 Base of Wall, Timber, 18/10/2017
  • HC BEVEL 502 Cavity at Enclosed Deck, 18/10/2017
  • HC BEVEL 600 Roof Wall Junction, 18/10/2017
  • HC BEVEL 601 Soffit Detail, Overhang, 18/10/2017
  • HC BEVEL 602 Eaves Detail, No overhang, 18/10/2017
  • HC BEVEL 700 Parapet Detail, 18/10/2017
  • HC BEVEL 800 Meter Box Detail, 18/10/2017
  • HC BEVEL 801 Pipe Penetration Detail, 18/10/2017
  • HC BEVEL 802 Pipe Penetration Plan Detail, 18/10/2017

Consenting instructions

Always refer to the Appraisal in full and the technical literature.

Appraisal holder

Herman Pacific Ltd
Address:
Phone: 09 421 9840

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