PermaTimber 146 Heavy Grain in American Oak
PermaTimberCompositeSolid core
4 colours
- Board size
- 146 × 22 mm5.4 m lengths
- Cap
- Not published
- Core
- Solid
- Fixing
- Hidden clips or face screwsRebated Fixing Clip (rebate double fixing clip)
- Warranty
- 10 years, residential
- Joist centres
- 450 mm maxResidential; 400 mm commercial
American Oak: render colour, indicative. Sampled from the maker’s swatch image (Maker’s web page) on 6 Oct 2026 for the designer’s 3D view; never the real board. Order a sample before you choose.
Other colours of 146 Heavy Grain (3)
Photos are the maker’s, credited. Render colours are indicative only.
Specifications
Every published fact, with its source and the day it was checked.
- solid coreclip groove14622
Deck board 146 × 22 mm · 5.4 m, drawn with solid core, cap not stated, grooved on both edges for hidden clips
The board
| Fact | Published value | Source · checked |
|---|---|---|
| Material | Wood-plastic composite | Perma Composites web page · checked |
| Core | Solid | Perma Composites web page · checked |
| Deck board | 146 × 22 mm, grooved both edges · 5.4 m lengths | Perma Composites datasheet · checked |
| Weight (146 × 22) | 4.1 kg per metre How this was readDatasheet V11: 4.1 kg/lm; 22 kg per board; 28.2 kg/m2. Product page agrees. | Perma Composites datasheet · checked |
| Recycled content | 87% How this was read"Made from 87% recycled materials" (datasheet, product pages and installation guides); composition is described as recycled hardwoods and plastics. | Perma Composites datasheet · checked |
Installation
| Fact | Published value | Source · checked |
|---|---|---|
| Max joist centres, residential | 450 mm How this was readDatasheet V11, product page and V12 guide agree: 450 mm (guide: 2 kPa). | Perma Composites datasheet · checked |
| Max joist centres, commercial | 400 mm | Perma Composites datasheet · checked |
| Gap between boards | 5 mmSources disagree. Perma Composites install guide says 1.5 (Mini Gap clip (146 and 225 boards): 1.5-2 mm.). The published value comes from the higher-ranked source; safety facts take the conservative one. How this was readV12 guide p. 4: standard gap clips give a 5-6 mm board gap; the lower figure is recorded. Mini Gap clips give 1.5-2 mm (146 and 225 only per the CX guide part numbers). | Perma Composites install guide · checked |
| End gap rule | Gap per metre of board: 1.3 mm under 10 °C; 1 mm at 10 to under 20 °C; 0.6 mm at 20 to under 40 °C; 0.4 mm at 40 °C and over · Gap at each end of a 5.4 m board: 7 mm under 10 °C; 5 mm at 10 to under 20 °C; 3 mm at 20 to under 40 °C; 2 mm at 40 °C and over | Perma Composites install guide · checked |
| Butt joints | Board ends land on a double joist How this was readV12 guide p. 7 and CX guide p. 8: butt joins must always sit over a double joist; stagger them; breaker boards (a board laid at 90 degrees, on double joists either side) are the preferred method for larger decks; full boards for runs up to 5.4 m. | Perma Composites install guide · checked |
| Minimum clearance under the boards | 100 mm How this was readV12 guide p. 3 and CX guide p. 6: minimum 100 mm clearance beneath boards for airflow, and a 1-2 mm per metre fall away from adjoining structures. All perimeter edges must be supported by joists (no overhang); do not rip below 45 mm wide. (also: fall 1-2 mm per metre) | Perma Composites install guide · checked |
| Subframes | timber and steel How this was readScrews specified for timber and steel subframes; Perma also supplies FRP joist systems (V12 guide p. 3). | Perma Composites install guide · checked |
| Fixing: hidden clip | Rebated Fixing Clip (rebate double fixing clip) | Perma Composites install guide · checked |
| Fixing: hidden clip | Anti-Creep Clip (one per board) | Perma Composites install guide · checked |
| Fixing: hidden clip | Start/Stop Clip (first row only) | Perma Composites install guide · checked |
| Fixing: hidden clip | Mini Gap clips (146 version) for a 1.5-2 mm gap | Perma Composites install guide · checked |
| Fixing: face screw | Stainless steel decking screws DFX005 How this was readStainless steel decking screws DFX005 (timber subframe) / DFX006 (steel subframe); pre-drill and countersink 1.5 mm over thread size | Perma Composites install guide · checked |
| Installation guide | Perma Composites install guide · checked |
Tested performance
| Fact | Published value | Source · checked |
|---|---|---|
| Slip resistance (AS 4586) | P5 (wet pendulum) How this was readProduct page technical table: "Slip Rating P5" (no test standard named on the page; datasheet V11 prints no slip class). No test report found. | Perma Composites web page · checked |
Warranty
| Fact | Published value | Source · checked |
|---|---|---|
| Warranty, residential | 10 years How this was readConsumer warranty: 10-year warranty period from date of purchase for defects in manufacturing or materials; cover to the first purchaser, registration form required; after year 5 the payout reduces pro rata by months elapsed over 120 (clause 8). Datasheet V6 and the range page also say 10 years. Colour variation is excluded (clause 7). | Perma Composites warranty · checked |
| Warranty, commercial | 7 years · computed, not quoted | Perma Composites warranty · checked |
Other published facts (3)
Other published facts
| Fact | Published value | Source · checked |
|---|---|---|
| Reaction to fire (AS ISO 9239.1) | Standard: AS ISO 9239.1-2003 · Report 24-004866 · Issued: 2024-12-03 · Sample: 146 Heavy Grain, American Oak, 22 mm, 28.2 kg/m2 · Critical heat flux (mean length) 4.7 kW/m² · HF-30 (mean length) 7.1 kW/m² · Smoke (mean) 282 %·min · Blistering: yes How this was readRadiant-panel flooring test on 6 mm fibre cement substrate; this is a reaction-to-fire test, not a BAL rating. Width-direction single results: CHF 6.7, HF-30 6.9, smoke 91. | AWTA Product Testing datasheet · checked |
| Custom colours (made to order) | Capri, Seychelles, Maui, Antigue (sic; swatch file is "Antigua"), Maldives, Monaco, Barbados, Sentosa, Bahamas, Mykonos, Santorini How this was readMade-to-order custom colour range, MOQ 120 m2 per the page; not counted as standard colours. | Perma Composites web page · checked |
| BAL-29 version (special order) | Datasheet V11: "BAL29 version available in Amalfi, Walnut & French Oak - please consult PermaTimber". The standard board is not rated; no test report is published.Sources disagree. Perma Composites web page says BAL 19 rated profiles available (Decking category page.). The published value comes from the higher-ranked source; safety facts take the conservative one. | Perma Composites datasheet · checked |
These are the rows for this colour’s board. The full specification, with every profile, is on the PermaTimber 146 Heavy Grain 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 PermaTimber 146 Heavy Grain prices in your state: each the average of the sellers we track there.
Price on request. No seller we track publishes a PermaTimber 146 Heavy Grain 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).
- Installation guidePermaTimber Decking Installation Guide V12 (8 Apr 2025; covers 146, 225 and 295)
- DatasheetPermaTimber 146 Heavy Grain Decking datasheet V11 (9 Jul 2026)
- DatasheetAWTA Product Testing report 24-004866, AS ISO 9239.1-2003 radiant-panel flooring test, 146 Heavy Grain American Oak (issued 3 Dec 2024)
- WarrantyPerma Composites consumer warranty (2022 version): 10-year warranty for consumers
All 9 sources behind this page
- 146 Heavy Grain Decking product page (colours incl. custom range, fixings, technical table)
- PermaTimber 146 Heavy Grain Decking datasheet V11 (9 Jul 2026)
- PermaTimber range overview (solid decking, retailer list, 10-year warranty claim)
- PermaTimber Decking Installation Guide V12 (8 Apr 2025; covers 146, 225 and 295)
- AWTA Product Testing report 24-004866, AS ISO 9239.1-2003 radiant-panel flooring test, 146 Heavy Grain American Oak (issued 3 Dec 2024)
- Perma Composites consumer warranty (2022 version): 10-year warranty for consumers
- PermaTimber 146 CX Decking Installation Guide v3 (file uploaded Sep 2026)
- Perma Composites Pty Ltd Terms and Conditions for supply to project clients (file dated 141124): 7-year product warranty from supply
- PermaTimber decking category page (ranges, "BAL 19" line, retailer list)
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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