Tongue & Groove Cladding Tech Specs

Technical Information for Tongue & Groove Cladding

Profiles & Sizes

Tongue & Groove Cladding is available in the following sizes with a shadowline of 5mm. For larger projects, custom sizes and profiles can be created upon request. Please contact us for more information.

Board Cover: 68x19mm (48.5mm cover), 88x19 (68.5mm cover), 138x19mm (118.5mm cover).

tongue-and-groove-cladding-sorrento-profiles

Species & Coatings

Need help selecting the right timber coating for your project? Our comprehensive guide explains everything you need to know about finishes and how timber naturally varies in colour.

While we aim to reproduce colours as accurately as possible, we strongly recommend requesting product samples before making your final selection. Timber is a natural material, and each species has its own unique features and colour variations. Although we manufacture our products with consistency in mind, samples may not fully represent the variation that can appear across an entire project.

Please Note: Natural Accent – Clear Exterior only available on request for Spotted Gum.

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Sculptform.24.04.25_5847(Raw Spotted Gum)-min

Raw

Sculptform.24.04.25_5859(Clear Oil Spotted Gum)-min

Clear Oil

Sculptform.24.04.25_5824(Clear Poly Spotted Gum)-min

Interior Only

Natural Accent - Clear

Sculptform.28.02.25_1891 (Mist Grey Stained Spotted Gum)-min

Interior Only

Natural Accent - Mist Grey

Sculptform.28.02.25_1902 (Double Black Tinted Topcoat Spotted Gum)-min

Interior Only

Natural Accent - Double Black

Sculptform.28.02.25_1923 (Rich Mocha Stain Spotted Gum)-min

Interior Only

Natural Accent - Rich Mocha

Sculptform.28.02.25_1854 (Blackwash Stain Spotted Gum)-min

Interior Only

Natural Accent - Blackwash

Sculptform.24.04.25_5853(Ultra Deck - Light Oak Spotted Gum)-min

Natural Accent - Intergrain Light Oak

Sculptform.24.04.25_5841(Raw US Oak)-min

Interior Only

Raw

Sculptform.24.04.25_5828(Clear Oil US Oak)-min

Interior Only

Clear Oil

Sculptform.24.04.25_5834(Clear Poly US Oak)-min

Interior Only

Natural Accent - Clear

Sculptform.28.02.25_1884 (Natural Tone Stained US Oak)-min

Interior Only

Natural Accent - Natural Tone

Sculptform.28.02.25_1856(White Wash Stain US OAK)-min

Interior Only

Natural Accent - Whitewash

Sculptform.28.02.25_1911 (Ochre Stained US Oak)-min

Interior Only

Natural Accent - Ochre

Sculptform.28.02.25_1869 (Mist Grey Stain US Oak)-min

Interior Only

Natural Accent - Mist Grey

Sculptform.28.02.25_1876 (Storm Grey US Oak)-min

Interior Only

Natural Accent - Storm Grey

Sculptform.28.02.25_1905 (Rich Mocha Stained US Oak)-min

Interior Only

Natural Accent - Rich Mocha

Sculptform.28.02.25_1892 (Blackwash Stained US Oak)-min

Interior Only

Natural Accent - Blackwash

Sculptform.28.02.25_1924 (Double Black Tinted Topcoat US Oak)-min

Interior Only

Natural Accent - Double Black

Sculptform.24.04.25_5840(Clear Poly Grandis)-min

Interior Only

Natural Accent - Clear

Sculptform.28.02.25_1883 (Earthtone Tinted Topcoat Grandis)-min

Interior Only

Natural Accent - Earth tone

Sculptform.28.02.25_1917 (White Wash Stain Grandis)-min

Interior Only

Natural Accent - Whitewash

Sculptform.28.02.25_1899 (Chalk White Tinted Topcoat Grandis)-min

Interior Only

Natural Accent - Chalk White

Sculptform.28.02.25_1914 (Ochre Stained Grandis)-min

Interior Only

Natural Accent - Ochre

Sculptform.28.02.25_1873 (Mist Grey Stain Grandis)-min

Interior Only

Natural Accent - Mist Grey

Sculptform.28.02.25_1865 (Storm Grey Stain Grandis)-min

Interior Only

Natural Accent - Storm Grey

Sculptform.28.02.25_1908 (Rich Mocha Stained Grandis)-min

Interior Only

Natural Accent - Rich Mocha

Sculptform.28.02.25_1896 (Blackwash Stain Grandis)-min

Interior Only

Natural Accent - Blackwash

Sculptform.28.02.25_1927  (Double Black Tinted Topcoat Grandis)-min

Interior Only

Natural Accent - Double Black

Sculptform.28.02.25_1868 (Storm Grey Stain Spotted Gum)-min

Interior Only

Natural Accent - Storm Grey

Timber Species Usage

All timbers recommended for exterior use are Durability Class 1 (AS 5604), ensuring peace of mind that the timber will remain durable for a minimum of 40 years.

Timber Species
Spotted Gum
American Oak
Grandis
Interior Use
Yes
Yes
Yes
Exterior Use
Yes
No
On Request

Species Durability

Durability is an important factor when using timber externally. Each species of timber falls into one of the following durability classes. These classes relate to above ground durability as per AS 5604: 2005.

Timber Species
Spotted Gum
American Oak
Grandis
Durability Class
Class 1 - Greater than 40 years
Class 3 - 7 to 15 years
Class 2 - 15 to 40 years
Usage
Interior / Exterior
Interior Only
Interior and sheltered exterior

Length Options

Timber battens are available in a range of length options to suit on-site needs.

 

Timber Random Lengths

Random Lengths

The most common form of timber supply with a length spread of 1.2m - 3.6m, with an average of 2.4m. Random length is supplied by default unless specified otherwise.

It is generally the most cost-effective way of procuring timber. All battens are supplied end-matched and must span across two clips. Battens are joined with our Sculptform Batten Joiner.

Set length

Set Lengths

Set length is used where a quantity of the same lengths are required for your project. Offered in lengths between 1.2m and 3.6m, set lengths are always supplied slightly over length to allow for onsite trimming.
Exact Length

Exact Length

Cut to exact length is similar to the 'Set Length' option, but with trimming to an accuracy of ±1mm. Accurate onsite measure required to prevent issues with uneven walls and ceilings.

Cladding Screw Types

Sculptform supply a quality stainless steel screw to be used for timber substrates with all timber cladding orders. A tough 304 stainless steel, the screw is designed to predrill and countersink in one easy motion. Sculptform can supply tek screws for steel substrates.

Wood Screw

304 grade stainless steel. #10g x 40mm ‘The Piranha’ – Self drilling with brown e-coat painted head.

Tek Screw

Galvanised tek screw #8g x 30mm.

Trims and Details

Aluminium Trims

L Profile

The L-Profile is used at wall ends, divider between the cladding and another material, against window frames, bottom of walls and many other applications.

Tongue-and-groove-cladding-l-profile

T Profile

Available in Natural Anodised (this can be powder coated to virtually any colour), the T-Profile was designed so large walls could be broken up into sections, creating breaks along the facade.

Tongue-and-groove-cladding-t-profile

 

Base Details

Vertical Cladding

Sealing the end grain well is a critical detail to ensure the long-term constitutional and aesthetic integrity of the cladding. If the end grain is not correctly sealed, water will soak up the end grain causing the timber to expand, mould to grow, and blackness to appear.

Tongue-and-groove-cladding-base-detail-l-profile

Horizontal Cladding

The aluminium starter piece is used at the bottom of the wall so that the first board can be concealed fixed. The trim is used when running your cladding boards horizontally, and is designed to fit into the groove of the Tongue & Groove Cladding profile.

Tongue-and-groove-cladding-base-detail-start-extrusion

End Matching

Standard end matching can be used with all profiles and performs the role of creating a neat, seamless linear effect. End Matching was designed so boards could be joined off-stud, a time and labour-saving innovation that removes the need for measuring and cutting on the stud. End matching slashes wastage from 10% to less than 5%*, and the design facilitates water run-off when used vertically.

The installation method for end-matching is the same whether the cladding is vertical or horizontal. Quality sealant needs to be applied to gap, then boards are pushed together. Excess sealant to be scraped off once dry.

 

tongue-and-groove-cladding-endmatching

Horizontal Cladding on Blockwork

tongue-and-groove-cladding-typical-horizontal-wall-setup-blockwork

For interior applications, batten centres to be at 600mm centres.

Horizontal Cladding on Studs

tongue-and-groove-cladding-typical-horizontal-wall-setup-stud

Interior studs spaced at 600mm centres. Exterior studs spaced at 450mm centres.

Vertical Cladding on Blockwork

tongue-and-groove-cladding-typical-vertical-wall-setup-blockwork

For interior applications, batten centres to be at 600mm centres.

Vertical Cladding on Studs

tongue-and-groove-cladding-typical-vertical-wall-setup-stud

Interior battens spaced at 600mm centres. Exterior battens spaced at 450mm centres.

Curved Walls

tongue-and-groove-cladding-curved-wall-1

First ensure the framing is set-up suitably, to allow for curved fixing battens. The centres of the stud work may have to be reduced excessively, depending on the radius. With curved walls it’s better to limit the board size to one of smaller width, particularly if the radius is tight.

Careful attention must be paid to the distance between the opening of the tongue and groove in external application. When the opening creates waterproofing concerns, run a sealant down the groove during installation and neatly cut off excess once dry.

Board Size
68mm
88mm
138mm
Convex
475mm
650mm
1200mm
Concave
Nil
Nil
Nil

Fire Resistance

Australia/New Zealand

Group Rating:

  • Group 3 according to NCC 2022 and AS 5637.1:2015
  • Group 3 according to NZBC C/VM2
  • Fireshield timber coatings are available to achieve Group 1 and 1-S. Contact us for more information. Download Codemark here.

Combustibility:

Deemed combustible according to AS 1530.1, NCC 2022 Vol 1 and NZBC C/AS2.

United States

ASTM E84:

  • American Oak with Natural Accent Coating - Class A or 1.
  • Spotted Gum: Class B or 2.
  • Grandis: Class B or 2.
  • Sansin FireStop99 Timber Coating available for Class A or 1.

United Kingdom

BS EN 13501-1 Classification:

  • HR Prof Fire Treatment timber coating available. Download HR Prof Spec sheet. 

Fire - BAL Ratings

Each timber species achieves different BAL ratings according to AS 3959-2009 as outlined below.

Timber Species
Spotted Gum
American Oak
Grandis
BAL Rating
29
Not tested
Not tested

Sustainability - Declare

Declare(r)-02_Declare_web

Sculptform is proud to offer products with Declare Labels, a transparency initiative that helps architects and designers make informed choices about materials. Declare Labels provide clear, accessible information on the ingredients used in our products, ensuring they meet strict sustainability standards. By choosing Sculptform, our customers can confidently specify materials that contribute to healthier, eco-friendly building environments, supporting their sustainability goals and aligning with green building certifications like LEED and WELL.

Our declaration is LBC RED LIST APPROVED.

This is defined as: products disclose a minimum of 99% of ingredients present in the final product and meet the LBC Red List Imperative requirements through one or more approved exceptions.

Sustainability - FSC/PEFC

Timber Certifications

Timber Species
Spotted Gum
American Oak
Grandis
FSC®
Not Available
On Request
On Request
PEFC® / Responsible Wood®
On Request
Not Available
Not Available

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