Pre-installation subfloor requirements

Acceptable subfloor types
CDX Underlayment grade plywood (at least 1/2" thick); Underlayment grade particleboard; OSB (at least 3/4' thick);
Concrete Slab; Existing wood floor; Ceramic tile; Resilient tile; Sheet vinyl.3.1

Subfloors

Although KlickerFloor® SPC core vinyl-click flooring is waterproof, it is not a moisture barrier. Any moisture problems needs to be corrected prior to installation. New concrete floors need to cure for a minimum of 60 days
British Standards drying time is recommended for new mineral and concrete floors of 1 month for each 1inch (25mm) of depth. Ensure concrete is cured and the subfloor is dry.

Do not install floors where it will be exposed to temperatures greater than 60°C.

Subfloor Preparation and Installation

The sub-floor surface must be Smooth, Dry, Clean, Solid and Flat. Any adhesive residue must be removed to ensure proper installation. The sub-floor should be flat within a tolerance of 1/8th inch (3mm) over a span of 4ft (1.22metres) (small / localized areas). Any unevenness over this must be sanded or filled with a floor leveler. Voids or humps in the sub-floor will prevent the floor from locking properly.

Moisture and humidity levels - use a hygrometer.

In mineral/concrete floors an electronic moisture meter reading must not exceed 2.5%; for wooden sub-floors 14%. Relative humidity levels must not exceed 75%; ascertained by the hygrometer.

Damp Proof Barrier

When laying over a new concrete or mineral underfloor, install a damp-proof barrier. If used, a 0.2mm polythene damp-proof membrane must overlap by a minimum of 200mm (8") and be taped together to form a damp-proof seal. Be sure to overlap the edges up each wall by a minimum of 25mm (1").