Overview

JSC Rusticated Weatherboards are extremely versatile and offer unique horizontal negative lines that accentuate the grain structure and natural beauty of timber cladding. Rusticated weatherboards have evolved over recent years with new and innovative Architectural profiles re-establishing the range to suit the current design methods. JSC offers a range of various widths and depth profiles to complement both modern and traditional designs.

General Description

This guide covers the recommendations for the correct scope of use, storage & handling, fixing, finishing and maintenance guidelines for JSC RustiClad Rusticated Weatherboard Cladding system.

JSC RustiClad is a cavity-based external wall cladding system comprising of:

• Timber weatherboards finished with high quality exterior grade coating options
• H3.2 treated timber castellated cavity battens
• Flashings and accessories

JSC weatherboards are available in a range of timber species and profiled to JSC specifications, consistent with NZS 3617 and BRANZ BU411.

This specification and installation guide covers the installation of JSC Rusticated weatherboards when fixed vertically over:

• JSC-U 20 mm thick castellated cavity battens; or
• JSC-H 45 mm thick castellated cavity battens

For direct fix installation of JSC weatherboards refer to Acceptable Solutions E2/AS1.

Building Code Regulation

The JSC RustiClad Rusticated Weatherboard System if designed and installed as per this literature, will meet the following provisions of the New Zealand Building Code (NZBC):

• Clause B1 Structure: Performance B1.3.1, B1.3.2, B1.3.4 (a), (b), (c), (d) and (e) for the relevant physical conditions of B1.3.3 (a), (e), (f), (h), (j), and (q)

• Clause B2 Durability: Performance B2.3.1(b) and B2.3.2(b)

• Clause E2 External Moisture: Performance E2.3.2, E2.3.3, E2.3.5, E2.3.7(b) and (c)

• Clause F2 Hazardous Building Materials: Performance F2.3.1

Scope and Limitation of Use

JSC RustiClad System must be installed by a suitably qualified and experienced trade person. Where Restricted Building Work (RBW) applies the installer shall be a Licensed Building Practitioner (LBP) or supervised by an LBP.

It is the specifier's responsibility to ensure that the details in this specification are appropriate for the intended application and that additional detailing is obtained for a specific design or any areas that fall outside the scope of our RustiClad CodeMark certificate GM30081.

JSC RustiClad - Selection Guide

JSC weatherboards are offered in a wide selection of species, sizes and profiles which offer infinite design flexibility and scope for innovation. Factors like site location, wind zones, coatings, and local weather conditions must be considered to ensure that the selected weatherboard performs as intended.

Weatherboard Selection

Selection of a suitable weatherboard type is an important step that influences the service life of the cladding. Some of the key things to consider while selecting weatherboards:

Species Selection

The choice of timber species is normally based on aesthetics, durability, workability, movement and stability, cost, coating choice, and availability.

Available Species:

Western Red Cedar (Thuja plicata)

• Width: Up to 250 mm
• Thickness: 18.5–39 mm
• Length: Random & Select
• Grades: PC1, STK, FJ, Engineered
• Surface Finish: Bandsawn, Dressed

Alaskan Yellow Cedar (Cupressus nootkatensis)

• Width: Up to 150 mm
• Thickness: 22 mm
• Length: Random
• Grades: PC1
• Surface Finish: Bandsawn

Iroko (Milicia excelsa)

• Width: Up to 150 mm
• Thickness: 21 mm
• Length: Random
• Grades: FAS
• Surface Finish: Bandsawn

Radiata Pine (Pinus radiata)

• Width: Up to 200 mm
• Thickness: 20 mm
• Length: Random
• Grades: Clears 1
• Surface Finish: Bandsawn, Dressed

JSC TMT Thermally Modified Species:

TMT Taiga RW

• Width: Up to 200 mm
• Thickness: 18.5 mm
• Length: Random
• Grades: STK
• Surface Finish: Bandsawn

TMT Taiga WW

• Width: Up to 200 mm
• Thickness: 18.5 mm
• Length: Random
• Grades: STK
• Surface Finish: Bandsawn

TMT Taxon TW

• Width: Up to 200 mm
• Thickness: 18.5 mm
• Length: Random
• Grades: Clear
• Surface Finish: Bandsawn

TMT Taxon HL

• Width: Up to 200 mm
• Thickness: 18.5 mm
• Length: Random
• Grades: Clear
• Surface Finish: Bandsawn

Weatherboard Profile

The choice of weatherboard profile predominately comes down to the aesthetics. All JSC weatherboards are profiled to JSC specifications and are compliant with NZS3617:2019 and BRANZ NU 411 (April 2011).

JSC weatherboards are available in range of species. Custom weatherboards are also available on request to suit the building aesthetic.

Surface Finishes

JSC weatherboards come in Bandsawn Face or Dressed Face.

Bandsawn Finish: A bandsawn finish accentuates the natural texture of the timber and increases the effective surface area for different stains – resulting in a longer lasting coating.

Dressed Finish: A dressed finish provides a smooth face that is preferable for painting. Dressed weatherboards will require sanding before coating with either paint or stain. Follow the sanding requirements of coating manufacturer specification.

Cavity Battens

JSC cavity battens are made of H3.2 CCA treated Radiata Pine.

Cavity Batten Options:

Non-Structural Fixed Cavity Batten

• JSC-U 20 x 45: 18° degree bevelled edges and castellation on both faces

Structurally Fixed Cavity Battens

• JSC-V 45 x 45: Square edges and castellation on both faces
• JSC-H 45 x 45: Bevel edges and castellation on both faces
• JSC-V 70 x 45: Square edges and castellation on both faces
• JSC-H 70 x 45: Bevel edges and castellation on both faces

Note: More species, grades, profiles, sizes and select length options may be available on request. More surface finishes can be made available to meet the aesthetic requirements.