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Overlay Flooring

Rimu Matai Overlay

Using solid timber flooring overlay on residential extensions and commercial re-fits involves installing timber flooring directly fixed to concrete slabs, particle board or plywood floor substrates.

Projects involving residential extensions using concrete slabs, shop fitouts, office designs can all be completed using our easy to install overlay floorboards.

Our timber boards are machined to a similar height as carpet and tiles leaving the decision to be made regarding floorcovering often as a final item to be installed.

In the case of concrete slabs, our floorboard installers apply a two pack resin to seal the slab and protect the timber overlay from any moisture. Flooring glue is then applied using a notched trowel and boards fastened using steel tacks drilled into the concrete surface.

Particle board and plywood substrates require a sand to scuff the surface and even out any raised edges.

Flooring options include Kauri, Rimu, Matai, Tawa, Totara, Beech, Damanu (Fiji Mahogany), Mountain Ash, Saligna and Oak. Machined to either 10mm, 12mm, 15mm and 19mm. We recommend keeping boards to under 100mm wide when choosing a 10 or 12mm board. When desiring  a wider board a 15mm or 19mm thick board will reduce movement after installation.

Staircases can easily be laid over using our overlay profile and remember to ask for our rounded edging profile for the tread edges.

When wanting to install data-wiring or services between the substrate and timber flooring consider installing our boards over battens. This involves installing kiln dried pine battens spaced and installed directly onto concrete the floorboards are then fixed to the battens.

Plywood is also used as an intermediate material between the concrete and timber flooring. This method will take care of any minor unevenness on the concrete surface and further reduces movement in the floorboards. A levelling compound can be used to fill in any undulations in the concrete slab. Bumps are sanded down using a concrete grinding disc.

Installation of timber floors on new slabs can take place 3 to 6 months after pouring. Your builder will measure the moisture content of the slab and advise it's suitability.

Overlay timber flooring (10 -12mm thick) is not suitable for heated concrete slabs. Floor to ceiling windows (northfacing in New Zealand) and airconditioning systems can also encourage rapid temperature changes in timber floorboards. This may lead to movement of the boards.

Like all timber flooring we recommend acclimatising the boards in the area to be laid for a period of three weeks raised on timber to avoid direct contact with the concrete slab.

Overlay flooring is a quick and easy way of finishing an extension. It will add value to your home, is easy to maintain and will look great for many years.

Talk to us about your next project, we work with professional flooring installers and stairmakers and are always happy to provide advice.

Further reading BRANZ bulletin issue 506 and 534



Tags: rimu flooring timber overlay Kauri Tawa


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