Timber Floor Over Concrete Slab

A vapor retarder is always required over the concrete slab and below the subflooring material.

Timber floor over concrete slab.

Treated plywood to the concrete with concrete screws spaced every 16 in. Alternatively screw rows of treated 1x4s to the concrete 16 in. Install it flat on the slab surface with the outside edge aligned against the side wall or the edge of the floor line. It is important that the additional height won t be a problem on your cabinet and your doors.

Installing the wrong kind of flooring over consistently damp concrete may encourage warping and wear over time. Installation of a timber floor over a concrete slab how to products used selleys vbs vapour barrier system used as a moisture barrier and selleys direct st. When a concrete slab absorbs moisture it can retain it for a surprisingly long time. Measure the overall length of the new floor and cut a length of 2 by 4 pressure treated lumber to this dimension for both sides of the room.

It is imperative that you make use of underlayment which can increase the height of the floor by around 40mm. Lay 6 mil polyethylene sheeting over the concrete to minimize moisture migration from the concrete up into the wood flooring. Fortunately a variety of flooring materials are water resistant enough to function well over a concrete slab.