Seal the slab with a waterproofing compound or a plastic membrane under plywood if in doubt or if there is evidence of previous water penetration.
Timber overlay flooring on concrete.
Solid parquet hardwood flooring can be glued directly to a concrete slab on grade or above grade with the use of a manufacturer recommended vapor retarder.
Wood substrates should have a moisture content no more than 14.
First and foremost you need to make sure that the concrete is in good condition generally.
A concrete sub floor is in many ways an ideal surface for laying an overlay wood floor.
Secure loose boards with deck screws and fill open seams with rapid setting polymer modified concrete.
The sub floor must be free of deflection l 360 considering both live and dead loads.
Before installing flooring over concrete supporting slabs should be dry with a moisture content no more than 5 5.
Boral overlay is designed to be glued down directly over concrete existing timber flooring or boral plywood as long as the existing floor is clean dry and flat.
If you are going to compare installing solid timber flooring on concrete slab relative to a wood subfloor the former is more complicated.
What you want to avoid is lumps and bumps in the subfloor that could cause problems to your final look.
It is supplied in blocks 260mm long x 65mm wide x18mm thick.
Prepare by sanding down to clean bare wood.
However there are certain points you simply must respect.
Boral parquetry can be laid in many patterns using contrasting timber species to create depth in design.
Solid overlay timber flooring is a product designed for applications where the beauty style and warmth of a solid timber floor is important but there are limitations on the area s sub floor or the application requires a floor thinner than traditional solid structural timber flooring.
Boral parquetry is a solid hardwood timber flooring product that is designed to be laid directly over a flat and level concrete slab plywood or particleboard flooring.
Boral overlay is designed to be glued down directly over concrete 80mm width only existing timber plywood or particle board.
It is imperative that you make use of underlayment which can increase the height of the floor by around 40mm.
Solid parquet should not be installed below grade.
Replace any weak or water damaged wood.