Biowood BioDeck in Spotted Gum
BiowoodCompositeHollow core
1 colour
- Board sizes
- 140 × 28 mm, 300 × 32 mm, 153 × 40 mm5.9 m lengths
- Cap
- Uncapped
- Core
- Hollow
- Fixing
- Hidden clipsADC285 black plastic decking connector (hidden clip)
- Warranty
- 15 years, residential
- Joist centres
- 450 mm maxResidential; 400 mm commercial
Profiled, not yet in the designer
Nobody has sampled a swatch for Spotted Gum yet, so the designer can’t render it and no render colour is shown here.
Specifications
Every published fact, with its source and the day it was checked.
- hollow coreclip groove14028
Deck board 140 × 28 mm · 5.9 m, drawn with hollow core, uncapped, grooved on both edges for hidden clips
- 14028
Deck board 140 × 28 mm · 5.9 m, drawn with hollow core, uncapped, grooved on both edges for hidden clips
- 15340
Deck board 153 × 40 mm · 5.9 m, drawn with hollow core, uncapped, grooved on both edges for hidden clips
- 30032
Deck board 300 × 32 mm · 5.9 m, drawn with hollow core, uncapped, grooved on both edges for hidden clips
The board
| Fact | Published value | Source · checked |
|---|---|---|
| Material | Wood-plastic composite | Green Resources Material web page · checked |
| Core | Hollow | Green Resources Material web page · checked |
| Cap | Uncapped | Green Resources Material web page · checked |
| Deck board | 140 × 28 mm, grooved both edges · 5.9 m lengths | Green Resources Material web page · checked |
| Recycled content | 69% How this was readGRM says "at least 69% PEFC-certified recycled wood floor [sic, probably wood flour] and high-quality hard PVC". The PVC fraction is not stated to be recycled. Other sources: Dahlsens says 69% wood and 23% hard PVC; Timberland says 70% natural timber fibres; CSIRO describes the tested board as wood flour, PVC and calcium carbonate. | Green Resources Material web page · checked |
Installation
| Fact | Published value | Source · checked |
|---|---|---|
| Max joist centres, residential | 450 mm How this was readGRM table headed "Maxim Span Centers (Residential Application)": 450 mm for DB14028, DBE14028, DB30032, DB15340 (also Big Board and DS04225). Interpreted as maximum support (joist) centres; the page does not define the term, joist material or board orientation. No BioDeck installation manual is published. | Green Resources Material web page · checked |
| Max joist centres, commercial | 400 mm How this was readGRM table "Maxim Span Centers (Commercial Application)": 400 mm for DB14028, DBE14028, DB30032, DB15340 (300 mm for Big Board BBDB14025 and DS04225). | Green Resources Material web page · checked |
ADC285 black plastic decking connector (hidden clip) | Green Resources Material web page · checked |
Tested performance
| Fact | Published value | Source · checked |
|---|---|---|
| Bushfire attack level (AS 3959) | BAL-29 How this was readMarketing claim backed by a CSIRO Certificate of Assessment, but it is NOT an AS 1530.8.1 deck test. GRM claims the BioDeck "premium range" is deemed acceptable to withstand exposure up to BAL-29 as bushfire-resisting timber under AS 3959:2009 Appendix F. The only test document found is CSIRO Certificate of Assessment No. 1775A (issued 1 Dec 2014, superseding No. 1775 of 18 Jan 2013): heat-release test per AS 3959:2009 App F after ASTM D 2898 Method B weathering, tested 15 Jan 2013; specimen = extruded wood flour/PVC/calcium carbonate decking board, nominal 27 mm thick, 20 kg/m2, light brown; maximum heat release rate 44.9 kW/m2 and 10-minute average 25.6 kW/m2. The certificate states no subframe, board gap, clip or profile conditions and names no profile, grade or hollow/solid section. GRM's table ticks "Premium Grade: BAL-29 Rated" for DB14028 and DBE14028 only (not DB30032, DB15340 or Big Board). Report number mismatch: certificate text cites investigation report FNK 11207, while the file name and CSIRO advisory FCO-5533 (28 Oct 2022, valid to 31 Oct 2027, cited in the cladding CodeMark certificate) cite FNK 10741 for the 15 Jan 2013 AS/NZS 3837 test at 25 kW/m2. The Bureau Veritas CodeMark certificate that states BAL-29 covers cladding only. | CSIRO BAL test report · checked |
| Slip resistance (AS 4586) | R11 (oil-wet ramp) | ATTAR slip test report · checked |
Warranty
| Fact | Published value | Source · checked |
|---|---|---|
| Warranty, residential | 15 years How this was readSingle 15-year term from date of purchase. The warranty text does not distinguish residential from commercial use, so it is recorded as residential only; the Premium brochure and Big Board brochure also say "15 years" / "serviceable 15 years limited warranty". | Green Resources Material warranty · checked |
| Warranty conditions | Single limited warranty from date of purchase covering manufacturing defects: cracking, splitting, swelling, rotting, flaking or peeling, water/moisture and termite damage. Colour and gloss change is not treated as wear (the text says about 10% colour fading per year is to be expected) and stains, scratches, indentation, installation and transit damage are excluded. Products must be installed, coated and maintained per Biowood current specifications and the BCA, with suitable fixings and coatings. Claim in writing with proof of purchase within 30 days of the defect becoming apparent; remedy is replacement or refund of the defective product (not installation or logistics cost). The text is governed by Australian and New Zealand law. How this was readParaphrased from the "15 Year Limited Warranty" in the colours-and-finishes PDF. The PDF is undated (server Last-Modified 2022-01-25) and is not specific to decking. | Green Resources Material warranty · checked |
Other published facts (15)
Other published facts
| Fact | Published value | Source · checked |
|---|---|---|
| Composition (as described by sources) | GRM: at least 69% PEFC-certified recycled wood plus hard PVC (not HDPE). CSIRO certificate 1775A: extruded decking board of wood flour, PVC and calcium carbonate. CSIRO FNR12594C: wood fibres, un-plasticised PVC, pigment and proprietary additives, hollow ribbed cross-section. Dahlsens (retailer, cladding page): 69% wood and 23% hard PVC. Timberland: 70% natural timber fibres. | Green Resources Material web page · checked |
| Critical radiant flux (AS ISO 9239.1-2003) | 10.2 kW/m2 average; mean flame travel 130 mm; average integrated smoke 71 %.min How this was readSpecimen: Biowood Spotted Gum Sanded Decking, hollow ribbed WPC board (two 102 x 28 x 1050 mm slats joined by T-shaped PVC connectors) on a T3 pine underlay frame, nominal total thickness 98 mm; tested 23 Jun 2020. Not a bushfire (BAL) test. | CSIRO datasheet · checked |
| Fire test results quoted by GRM for BioDeck | AS/NZS 3837 Group 3 (CSIRO FNK 11808); AS ISO 9239.1-2003 critical radiant flux 10.2 kW/m2 (CSIRO FNR 12594C); AS/NZS 1530.3 indices from CSIRO FNE 10012: ignitability 13, spread of flame 0, heat evolved 1, smoke developed 7. GRM also says BioDeck complies with C1.10 of NCC 2019 and can be installed on Type A construction for class 2 to 9 buildings. How this was readManufacturer-quoted results; only FNR12594C (hollow Spotted Gum sanded board on a timber underlay, tested 23 Jun 2020) was opened in full. | Green Resources Material web page · checked |
| Water absorption (GRM claim) | less than 0.05% How this was readNo test report for this figure was found in the files opened. | Green Resources Material web page · checked |
| UV seal and maintenance (decking) | Outdoor Biowood is supplied UV sealed with Bioseal. For decking GRM expects a UV-seal life of about 2 to 3 years because of wear and tear; the board is described as homogeneous so it can be re-sanded and re-sealed. Recommended seals: Intergrain Enviropro Endure Deck stain (satin) or Bioseal UV Seal (matt). | Green Resources Material web page · checked |
| Global GreenTag status | GreenRate Level B and PHD PlatinumHEALTH certificates are shown as "Under Renewal" on the GreenTag listing; GRM's page says Biowood was renewed in 2024 with a Level B award. How this was readStatus as displayed on 2026-10-06. GreenTag lists a "<=15 year warranty". | Global GreenTag web page · checked |
| CodeMark certificate scope | CodeMark CM70122 Rev3 (Bureau Veritas) covers Biowood shiplap weatherboards and castellated cladding only, and says Biowood weatherboards are bushfire-resisting timber usable up to BAL-29 for class 1/10a, 2 and 3 buildings. It is not a decking certificate. | Bureau Veritas datasheet · checked |
| BAL-29 marketing statement (Premium brochure) | Brochure says the "Premium grade" board meets the requirement for bushfire-resisting timber and is deemed acceptable to withstand exposure up to BAL-29 as specified in AS 3959:2009 Appendix F, and that the premium deck range was tested through CSIRO AS 3837:1998 up to 25 kW. The same brochure gives a 15-year product warranty from date of purchase. How this was readBrochure PDF created 2015-07-28; wording is a marketing restatement of CSIRO Certificate of Assessment 1775A, with no installation conditions. | Green Resources Material datasheet · checked |
| Slip class mapping used for the W result | AS/NZS 4586:2004 wet-pendulum classes: V >54, W 45-54, X 35-44, Y 25-34, Z <25 BPN; the 2013 edition labels the same bands P5, P4, P3, P2, P1 respectively. How this was readThird-party summary page, used only to translate the 2004 "W" label in the ATTAR report; the report itself does not give the criteria. | Workplace Health and web page · checked |
| Manufacturer statement | PT Latrade Batam Indonesia (Latrade Industrial Park, Block E-3, Jl Sei Binti, Tanjung Uncang, Batam 29422) calls itself a manufacturer of the Biowood and GRM brands supplying more than 29 countries since 2010, making composite decking, cladding, ceilings, louvres and flooring. | PT Latrade Batam web page · checked |
| Other items in the BioDeck specification table | DS04225 42x25x5850 mm (purpose not stated; residential 450 / commercial 300 mm listed), ECDB14028 140x28x6 mm (not described; the Big Board brochure shows a "Cover Mould" CMO2506 140x25x6 mm), ADC255 25x5 mm and ADC285 28x5 mm (clips). | Green Resources Material web page · checked |
| Factory range not in GRM Australia table | The manufacturer's site also lists Decking Solid 140x28 (DBS14028), Decking Tongue & Groove 140x28, and other widths (100x20, 153x25, 153x32, 168x20). How this was readGRM Australia's table lists only the hollow profiles above; availability of the solid or T&G boards in Australia is not stated. DBE14028 is "Decking End 140 x 28" on the factory site. | PT Latrade Batam web page · checked |
| Same product code sold in other markets | GRM Biowood International (Singapore) Pte Ltd lists DB14028 (140x28) as non-stock, minimum order 20 pieces, and says it is the exclusive agent for GRM and Biowood branded products in Singapore. How this was readSingapore listing shown only to confirm the product code and regional brand model; its price, stock and other terms are not Australian data and were not used. | Maker’s web page · checked |
| Biowood colour palette on GRM colours page (shared by cladding, shiplap and castellated; decking-specific availability not stated) | Classique: Spotted Gum (Bioseal UV Seal Brown), Deep Walnut (Brown), Charred Wood (Monument), Black Japan (Black), Western Red Cedar (Clear), American Walnut (Clear). Premium: Natural Oak, Weatherwood, Lexicon White. Sanded Embossed UV Sealed range: Charred Wood, Natural Oak, Driftwood, Lexicon White. Shiplap/castellated two-tone options also listed. The colours-and-finishes PDF additionally lists Caoba (Rich Chocolate). How this was readThe BioDeck page links to this colours page but its table only says "Prime Colours (Sanded)" and "Premium Colours (Sanded Embossed)" per profile; which palette colours exist as decking boards is not stated, and the swatch photos on the page are of cladding profiles. | Green Resources Material web page · checked |
| Extended custom prefinished colours via Timberland (VIC distributor) | Wenge, Weatheredwood Grey, Walnut, Sydney Blue Gum, Spotted Gum, Redwood, Mocha, Ebony, Driftwood, Cypress, Charcoal, Bondi Sand, Silver Fir, Merbau, Mahogany, Jarrah How this was readPage last modified 2019-11-25; "colours shown are based on the Biowood sanded finish"; size restrictions and lead times may apply to custom colours; factory prefinished with Cabot's Intergrain stain. Page also mentions Biowood decking with Intergrain UltraGrip "tested to achieve an R12 slip rating" (no report cited; the ATTAR report in the GRM file shows R11). | Timberland web page · checked |
These are the rows for this colour’s board. The full specification, with every profile, is on the Biowood BioDeck page.
Every fact here carries its source and the day it was checked. Documents opened 6 Oct 2026.
Prices by state
Set your state once and every price on this site is quoted for it, including GST. Then this page shows the Biowood BioDeck prices in your state: each the average of the sellers we track there.
Price on request. No seller we track publishes a Biowood BioDeck price anywhere in Australia yet. That means no data, not that it isn’t sold.
It can still be quoted: draw your deck in the free designer and get your free deck pack. Local builders and suppliers quote from it.
Customer reviews
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Documents
The maker’s own documents, linked where they publish them (never re-hosted).
- DatasheetCSIRO Certificate of Test FNR12594C (AS ISO 9239.1-2003 critical radiant flux) on Biowood Spotted Gum Sanded Decking; issued 7 Jul 2020
- WarrantyBiowood Materials, Colours & Finishes PDF containing the "15 Year Limited Warranty" text (undated; server Last-Modified 2022-01-25)
- Bushfire (BAL) test reportCSIRO Certificate of Assessment No. 1775A (job NK6737): Biowood decking board tested to AS 3959:2009 Appendix F (bushfire-resisting timber); issued 1 Dec 2014, test date 15 Jan 2013
- Slip test reportATTAR test reports 12/5841.19, 12/5841.20, 12/5841.21 (13 Apr 2012): dry, wet pendulum and oil-wet ramp slip resistance of Intergrain UltraDeck with UltraGrip on GRM/Biowood composite timber
All 15 sources behind this page
- GRM Australia - BioDeck Architectural Decking Concealed Fixings (product page with materials specification table; page last modified 2025-11-03)
- CSIRO Certificate of Test FNR12594C (AS ISO 9239.1-2003 critical radiant flux) on Biowood Spotted Gum Sanded Decking; issued 7 Jul 2020
- PT Latrade Batam Indonesia - Decking product category and product pages (DB14028, DBE14028 "Decking End", DBS14028 "Decking Solid", etc.)
- Biowood Materials, Colours & Finishes PDF containing the "15 Year Limited Warranty" text (undated; server Last-Modified 2022-01-25)
- CSIRO Certificate of Assessment No. 1775A (job NK6737): Biowood decking board tested to AS 3959:2009 Appendix F (bushfire-resisting timber); issued 1 Dec 2014, test date 15 Jan 2013
- ATTAR test reports 12/5841.19, 12/5841.20, 12/5841.21 (13 Apr 2012): dry, wet pendulum and oil-wet ramp slip resistance of Intergrain UltraDeck with UltraGrip on GRM/Biowood composite timber
- GRM Australia - home page (company statement, Sefton NSW address, materials claims; page last modified 2026-07-20)
- GRM Australia - Biowood Colours and Finishes page (page last modified 2025-11-03)
- Global GreenTag - certified product listing "Biowood Decking, Cladding, Ceiling, Screening, Fencing, Street Furniture and Flooring systems"
- CodeMark Certificate of Conformity CM70122 Rev3 (Biowood cladding; Appendix A4 names the manufacturing plant); issued 2 Aug 2022, revalidated 31 Jul 2025
- Biowood Premium BAL-29 Rated Architectural Decking brochure (A4-Premium-Decking-Brochure.pdf; PDF created 2015-07-28)
- Past and Present Classifications of the Australian Slip Testing Standards (third-party reference for AS/NZS 4586:2004 W class vs 2013 P classes)
- PT Latrade Batam Indonesia - manufacturer home page ("manufacturer of Biowood and GRM brands")
- GRM Biowood International (Singapore) - DECKING DB14028 product page (states it is the exclusive agent for GRM and Biowood products in Singapore)
- Timberland (VIC) - "Biowood Extended Colours" page (page last modified 2019-11-25)
Facts are taken from the highest-ranked source (certificates and test reports, then install guides and datasheets, then warranties, then web pages); when sources disagree the specification says so, and safety facts take the conservative value. Every plan the designer draws from these figures is a concept plan, not for construction: the span tables behind its framing have been checked by a structural engineer, but a builder, building surveyor or certifier must check the plan before you build.
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Board: 140 × 25 mmCap: UncappedFixing: Hidden clipsPrice: Price on request