Flooring

Carpet fitting: gripper rod spacing 50–75mm from skirting, underlay selection (PU foam, felt, rubber), power stretcher across width, seam placement away from high-traffic areas, hot-melt tape seaming

Floor screed types: sand/cement (minimum 65mm unbonded), anhydrite/liquid screed (minimum 30mm over UFH), fibre-reinforced, drying rates (1mm/day sand/cement), hygrometer moisture testing before flooring

Hardwood floor sanding: drum sander technique, grit sequence 24→40→80→120, edge sander corners, hard wax oil vs lacquer finish, COSHH wood dust WEL 1mg/m³, dust extraction mandatory

LVT installation: glue-down vs click comparison, subfloor flatness tolerance 2mm per 2m, expansion gap 5–8mm at perimeter, temperature acclimatisation 48 hours, adhesive notch trowel size by LVT thickness

Parquet and herringbone flooring: layout from centre of room, SBR rubber dispersion adhesive vs bitumen, drum sanding sequence (40→60→80→120 grit), hardwax oil vs lacquer finish, moisture content ≤10% before laying

Floor levelling compounds: BS 8204-7 SR2 ±3mm/3m tolerance, SBR priming mandatory, anhydrite screeds require specialist primer, moisture ≤75% RH before resilient flooring, working time 15–30 minutes

Subfloor preparation: DPM systems for damp concrete (epoxy/polyurethane), ply overlay minimum 9mm BS EN 636 C2, moisture testing 72h in-situ hygrometer, substrate assessment before any finish floor

Vinyl sheet flooring: cushion-back (perimeter bond only), felt-back (full bond), heat welding seams 350–400°C, B1 notch trowel, vinyl tiles 450°C, acclimatise 24h before laying

PTV >36 for wet areas (BS 7976-2), epoxy resin 2mm minimum, mosaic tile ≤50mm for falls, 22mm falls per 1m to linear drain, linear drain at shower entry not against wall