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Client has installed a new spotted gum T & G floor on new joists with interfloor insulation . The house is a Federation house with a new concrete slab apron around the perimeter and an ag line. They had it acclimatising for 2 weeks in the interior under a fully enclosed house. They say the expansion joints are squeezed and the floor is bowed. The floor has a water based polyurethane finish ,which has had temp covering over it for protection. The house has not been occupied yet. What are your recommendations to remedy this?

Woodsolutions Answer +

Clearly the flooring has taken up moisture from somewhere, causing it to swell. The first step is to find the source of moisture. We suggest you check the sub-floor ventilation to make sure it meets NCC requirements. The NCC calls for ventilation openings ranging from 2000 to 6000 mm2/m of external wall, depending on the climatic zone. If sub-floor ventilation is adequate, and the ground under the floor is not unusually damp, perhaps there is a plumbing leak letting moisture into the underfloor insulation. If you can find the source of moisture and allow the flooring to dry out it may shrink back to a level surface. Otherwise, if it remains a problem you might need a site inspection. The Australasian Timber Flooring Association (ATFA) provides this service, more information here:

Flooring swelling

We need to achieve group 2 for a timber battened ceiling. Is there anyway of achieving this without an applied finish?

Woodsolutions Answer +

All timbers we have tested fall into Group 3, no matter how dense. However, fire retardant coatings can be used on interior timber to achieve a Group 2 rating, including clear coatings for a natural finish. You will find suppliers if you search using the words 'fire retardants', 'intumescent coatings' or similar.


I am refurbishing a mezzanine of a warehouse to turn into a yoga studio. It is a 90sqm space with a suspended concrete floor on steels beams. It currently has carpet tiles and I am looking into putting a floating timber floor. Which timber would you recommend for this space?

Woodsolutions Answer +

One of the lighter-coloured timbers would probably be best, such as Victorian ash. Darker woods tend to show every speck of dust. You could consider installing your floating floor as a 'sprung' floor, more details here showing the various kinds of sprung floors: Sprung floors are popular where active movement takes place, such as yoga, gymnastics etc.

Sprung floor
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