Merbau Decking 90x19 Set Length

Merbau decking, 90 × 19 mm in set lengths from 1.8 m to 5.7 m: a kiln-dried, Standard and Better grade imported hardwood with a smooth face and reeded reverse, Class 1 durable above ground, and on the AS 3959 bushfire-resisting timber list for decks up to BAL-29.

• Lengths: set lengths from 1.8 m to 5.7 m in 300 mm steps; also sold in random lengths
• Timber: Merbau (Intsia bijuga and I. palembanica), imported from Southeast Asia and the Pacific; orange-brown when cut, darkening with age; about 830–860 kg/m³, Janka hardness 8.5 kN
• Durability: Class 1 above ground, which the Queensland Government rates at more than 40 years’ expected life; the heartwood is termite resistant
• Bushfire: on the AS 3959 list of bushfire-resisting timbers, so it can be used for decking up to BAL-29 (BAL-40 and Flame Zone need tested systems)
• Joist spacing: 450 mm centres, as WoodSolutions recommends for decking; its deck design guide allows up to 500 mm for 19 mm hardwood, or 350 mm if the boards run at 45°
• Gaps: 3–4 mm between boards at installation for 90 mm seasoned hardwood (WoodSolutions deck design guide)
• How much for a deck: with a 3.5 mm gap, each m² takes about 10.7 lineal metres, so a 20 m² deck needs about 215 lineal metres plus about 10% for offcuts, and roughly 48 fixings per m² on 450 mm joists
• Low decks: under 400 mm off the ground, WoodSolutions suggests 5–6 mm gaps and at least 40 mm between the deck and the house, for airflow
• Fixing: two fixings per board at every joist, at least 12 mm from edges and ends. Pre-drill: WoodSolutions notes Merbau tends to split unless pre-bored. Use stainless steel within 1 km of the coast or 1 m of a pool. See our decking screws
• Reeded reverse: WoodSolutions says either face can go up. Reeds add grip across the board but hold moisture, so keep a reeded-up deck clean in damp spots
• Tannin: Merbau can bleed tannin and gum that stains concrete, paving and brickwork. Seal all faces and cut ends, and to oil new boards straight away, draw the tannin out first with Intergrain UltraPrep Tannin & Oil Remover
• Finishing: coat every face and cut end, ideally before fixing, then recoat at least once a year or as the oil maker directs (WoodSolutions); left bare, it weathers to silver-grey. Oils we stock: CUTEK CD50, Intergrain Universal Timber Oil or Sceney’s Timber Decking Oil
• At Greenhill: stocked at 170 Settlement Road, Thomastown, with pickup or delivery across Melbourne and regional Victoria. Compare species on our hardwood decking page.

Compare every size, length and price in our Merbau decking range.

90 x 19mm Merbau Set Length

is a premium Australian favourite, renowned for its exceptional durability, natural beauty and long-lasting performance. Featuring rich brown tones and distinctive timber grain, Merbau is ideal for creating stylish outdoor entertaining areas, decks, boardwalks, screening and other above-ground applications.

Each board is kiln-dried for enhanced stability, reducing movement after installation while providing excellent resistance to everyday wear and the harsh Australian climate. Available with a smooth face and reeded reverse, 90 x 19mm Merbau offers flexibility in installation while maintaining a premium finish.

Features

• Kiln-Dried for improved stability and reduced movement
• Standard and Better grade Merbau hardwood
• Dressed All Round (DAR) finish
• Class 1 Durability (Above Ground)
• Naturally termite resistant
• Suitable for decking, screening, fencing and gates
• Rich brown colour with attractive natural grain
• Smooth face with reeded reverse
• Ready to oil, stain or leave to naturally weather
• Pre-oiled option available (final top coat recommended after installation)
• Available in random lengths
• Suitable for BAL-29 bushfire-prone areas
• Complies with Australian Standard AS3959

Merbau is naturally stable and highly durable, making it one of Australia's most trusted hardwoods for outdoor projects. To preserve its rich colour and maximise service life, we recommend applying a quality decking oil or timber sealer after installation and as part of ongoing maintenance.

Installation Note: Most decks are laid smooth face up with the reeded side down, though WoodSolutions notes either face can be used.

Pick up from 170 Settlement Road, Thomastown. Stocked lines are usually ready the same day. Delivery across Melbourne and regional Victoria is quoted on the order; call (03) 9465 9875 for a price on your suburb.

All prices include GST. Flooring is priced per square metre, decking and dressed timber per lineal metre, framing and posts per length. Trade accounts get trade pricing on the site and at the counter: apply here.

Bring your room or deck sizes in, or call (03) 9465 9875, and we will work out boards, lengths, fixings and oil, with about 10% allowed for cuts.