Structural Unfinished Engineered Oak Flooring - AB Grade – 20/4 × 190 × 1900mm

Before delivery and acclimatisation

• Use a competent wood-floor fitter and ensure the building is weather-tight with all wet trades complete.
• Maintain at least 18°C and 40–60% relative humidity; keep a written record of site and subfloor readings.
• Acclimatise sealed packs flat for at least 48 hours, supported clear of walls and direct heat.

Subfloor preparation and moisture

• The subfloor must be sound, clean, dry and free of paint, plaster, oil, dust and movement.
• Check flatness with a 2 m straightedge. Variation must not exceed 3 mm; level high or low areas before fitting.
• Measure and record subfloor moisture with the correct calibrated meter. Apply a compatible surface damp-proof membrane where readings or construction require it.
• Secure loose timber subfloors, countersink fixings and overlay uneven boards with suitable flooring-grade plywood without aligning joints.
• For full bonding, mineral subfloors must be below 65% RH; floated installations require below 75% RH. Timber subfloors must be within 2% moisture content of the flooring.

For more detail, read our engineered-floor subfloor preparation guide.

For boarded or suspended bases, read our timber subfloor preparation guide.

Fitting this floor

• Required method for this product: Fully bond, float or secret-fix to a suitable timber subfloor.
• For a floated tongue-and-groove floor, use the correct underlay and a continuous bead of D3 joint adhesive in both long and end grooves; do not spot-glue joints.
• For a bonded floor, use a compatible permanently flexible wood-floor adhesive and the specified notched trowel, checking adhesive transfer as work proceeds.
• Lay from at least three packs, inspect every board in good light and reject visible defects before fixing.
• Stagger end joints by at least 200 mm and avoid a repeating brick-bond pattern.

Use a system appropriate to the site and read our wood-floor adhesive guide.

Expansion, inspection and completion

• Provide at least a 10 mm continuous expansion gap at walls, door frames, pipes, hearths and fixed obstructions.
• Use movement breaks between rooms and wherever the manufacturer’s maximum uninterrupted span would be exceeded.
• Allow for cutting waste, grading and natural variation; mix boards across packs before fixing.
• Stop and contact Wiltshire Wood Flooring Supplies before fitting if the product, subfloor, site readings or proposed method do not match these requirements.