Merbau Decking 190x19 Set Lengths

Merbau decking, 190 × 19 mm in set lengths of 1.8, 2.1 and 2.4 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 of 1.8 m, 2.1 m and 2.4 m, so you can plan joins and cut waste
• 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°
• Wide boards: WoodSolutions’ gap table stops at 140 mm and notes that wider boards need more thickness to resist cupping, so give a 190 × 19 mm deck good airflow underneath and seal every face
• How much for a deck: each m² takes about 5 lineal metres of 190 mm board, so a 20 m² deck needs roughly 100 lineal metres plus about 10% for offcuts; tell us the deck size and we will work out the set lengths
• 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.

190 x 19mm Merbau Decking – Set Lengths

The 190 x 19mm Merbau Decking is a premium hardwood designed to create a bold, modern outdoor living space. Its extra-wide profile delivers a clean, architectural appearance with fewer board joins, making it the perfect choice for large decks, pool surrounds, boardwalks and premium outdoor entertaining areas.

Supplied in set lengths, this profile makes planning your deck easier, helps minimise joins and waste, and creates a more consistent finish. Kiln-dried for enhanced strength and stability, Merbau is built to withstand Australia's harsh climate while showcasing its rich brown colour and beautiful natural grain.

Features

• Kiln-Dried for superior strength and stability
• Standard and Better grade hardwood
• Class 1 Durability (Above Ground)
• Naturally termite resistant
• Extra-wide 190mm profile for a modern architectural finish
• Supplied in set lengths for easier installation and fewer joins
• Rich brown colour with attractive natural timber grain
• Smooth face with reeded reverse to improve drainage and reduce moisture retention
• Suitable for residential and commercial decking projects
• Ideal for decks, pool surrounds, boardwalks and outdoor entertaining areas
• Can be oiled, stained or left to naturally weather
• Available pre-oiled for added protection (final top coat recommended after installation)
• Suitable for BAL-29 bushfire-prone areas
• Complies with Australian Standard AS3959

Why Choose 190 x 19mm Merbau?

The 190 x 19mm profile is perfect for homeowners, builders and architects wanting a premium, contemporary decking finish. Its wider boards reduce the number of visible joins, creating a cleaner, more luxurious appearance while speeding up installation.

Merbau remains one of Australia's most trusted hardwood decking timbers thanks to its exceptional durability, natural resistance to termites and decay, and long service life. With regular cleaning and oiling, your Merbau deck will maintain its rich colour and continue performing for many years.

Greenhill Timbers Recommendation: Before installation, we recommend oiling all sides of the boards, including the underside and cut ends, and applying joist protection tape to the subframe. These simple steps help minimise moisture absorption, improve stability and significantly extend the life of your deck.

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.