Engineered vs Solid Timber Flooring: Which Should You Choose?

The short answer

If your home is built on a concrete slab, and most Gold Coast homes built in the last few decades are, engineered timber is usually the easier and lower-risk option. It is more dimensionally stable, it can be floated or glued directly to the slab, and it goes down faster with less disruption.

If your home has a timber subfloor on joists, or you are renovating a Queenslander or an older house where boards can be nailed down, solid timber is a natural fit. It gives you the full thickness of hardwood and the most scope for sanding and refinishing in the future.

Both are genuine timber floors that look and feel like timber, because they are. The right choice depends mostly on your subfloor, your budget, how you live and how long you expect to keep the floor.

How each floor is made

Solid timber boards are cut from a single piece of hardwood, typically around 19 mm thick in Australia, with a tongue and groove along the edges. Popular Australian species include blackbutt, spotted gum and ironbark. Many solid floors are installed raw and then sanded and coated on site, although pre-finished solid boards are also available.

Engineered timber has a real hardwood wear layer, usually a few millimetres thick, bonded to a core made from cross-laminated plywood or another stable composite. The layers run in different directions, which is what makes the board resist swelling and shrinking. Engineered boards almost always come pre-finished from the factory, so there is no sanding, dust or coating smell on installation day.

Because only the top layer is premium hardwood, engineered timber makes wide, long boards and species such as European oak more affordable and more stable than they would be as solid boards.

Stability in Gold Coast humidity

Timber is a natural material that absorbs and releases moisture. In a humid coastal climate, solid boards expand in the wet months and contract when the air dries out. Good installers allow for this with acclimatisation, expansion gaps and the right fixing method, but solid timber will always move more than engineered.

Engineered timber's cross-layered core resists that movement, so the floor is less prone to cupping, gapping and squeaks. That stability is the main reason engineered timber has become the default recommendation for slabs, for wide boards, and for homes near the water or with large areas of glass and sun.

Whichever you choose, the slab or subfloor must be dry and flat. Ask for the slab to be checked for moisture before installation, because moisture coming up through a slab is one of the most common causes of timber floor problems.

• Solid timber: moves more with humidity, needs careful acclimatisation and expansion allowance
• Engineered timber: more dimensionally stable, better suited to slabs, wide boards and sunny rooms
• Both: need a dry, flat subfloor and correct expansion gaps at walls and fixed objects

Installation methods

Solid timber is traditionally nailed or screwed to timber joists or battens. On a concrete slab it can be direct-stuck with a flexible adhesive, or installed over battens or a plywood underlay. Raw boards are then sanded and coated in place, which adds time: expect several days for sanding, coating and curing.

Engineered timber can be floated over an underlay, direct-stuck to the slab, or in some cases nailed. Floating is the fastest method and is often used over existing flat tiles. Direct-stick gives a more solid feel underfoot and is quieter, which matters in apartments where body corporate acoustic rules apply.

Because engineered boards arrive pre-finished, a typical living area can often be installed in one to two days, with furniture back in place soon after.

Sanding and lifespan

A solid timber floor can be sanded back and recoated several times over its life, which is why well-kept solid floors in older homes can last generations. Scratches, wear paths and dated stain colours can all be sanded out.

Engineered timber can also be sanded, but only as many times as the wear layer allows. A thicker wear layer can usually handle one or more light sands; a thin wear layer may only suit a light buff and recoat. If long-term refinishing matters to you, ask about the wear layer thickness when comparing products.

For most households, a factory-finished engineered floor looked after with mats, felt pads and gentle cleaning will look good for many years before it needs any attention.

Cost

As a guide, engineered and solid timber sit at the top end of flooring prices on the Gold Coast, typically around $110 to $200 per square metre supplied and installed. Solid timber that is sanded and coated on site adds labour and time, while premium wide-board engineered oak can also sit at the upper end.

The subfloor has a big effect on the final price. A flat, dry slab ready for floating or direct-stick is simplest. Slabs that need grinding, levelling or moisture treatment, or timber subfloors that need fixing down, add cost. We check all of this at the free measure and include it in a fixed written quote.

See our Gold Coast flooring cost guide for how timber compares with hybrid, vinyl plank and carpet.

Which should you choose?

Here is how we usually match timber floors to homes:

• Home on a concrete slab: engineered timber, floated or direct-stuck
• Apartment with acoustic by-laws: engineered timber direct-stuck or floated over a tested acoustic underlay
• Queenslander or home on timber joists: solid timber nailed down, or engineered over a suitable underlay
• Wide boards, European oak, lots of sun or glass: engineered timber for stability
• You want to refinish many times over decades: solid timber
• Fastest installation with the least disruption: pre-finished engineered timber

Caring for timber floors

Sand and grit are the biggest enemies of any timber finish, so put a good mat at each entry and vacuum or sweep regularly. Clean with a barely damp mop and a pH-neutral cleaner designed for coated timber, and avoid steam mops and wet mopping.

Use felt pads under furniture, lift rather than drag heavy items, and close blinds during the harshest afternoon sun to reduce colour change. Wipe up spills promptly, particularly near kitchens and doors to the pool.

If you are unsure which timber floor suits your home, we can bring engineered and solid samples to you, check your subfloor and give you a fixed written quote for both options.

Choosing a species and colour

Species affects both the look and how the floor wears. Blackbutt has light, even tones that suit coastal and Hamptons-style homes. Spotted gum has more colour variation and strong character, and it is very hard-wearing. European oak, usually supplied as engineered boards, comes in light, natural and smoked tones and in wide, long boards that make open-plan spaces feel larger.

Lighter, matte finishes tend to hide dust, sand and fine scratches better than dark or glossy floors, which is worth considering in beachside homes and homes with pets. Always look at samples in your own light: timber can look very different under morning sun, afternoon sun and evening downlights.

Questions to ask before you buy

Whichever type of timber you choose, these questions help you compare quotes fairly:

• What is the wear layer thickness (engineered) or board thickness (solid)?
• Will the floor be floated, direct-stuck or nailed, and why?
• Has the slab or subfloor been moisture tested and checked for level?
• Is subfloor preparation included in the quote?
• What finish is used, and what cleaning products does it need?
• How long will installation take, and when can furniture go back?