Substrate Identification Floors Principal Substrates T G floorboards

Substrate Identification Floors

Principal Substrates T & G floorboards Flooring grade boards Concrete Screeded concrete Tile Backer Boards Under Floor/Under Tile Heating Anhydrite

Minor Substrates Existing ceramic tiles Vinyl tiles Steel Fibre Glass

Preparation Floors

T & G Floorboards Check strength of floor Check ventilation Stiffen with extra noggins Screwed down every 300 mm

Overlay Boards WBP 15 -18 mm 0. 5 to 1. 5 mm gap between 300 mm centres Brick bond

Concrete Ideal background Allow 6 weeks drying time

Sand Cement Screed Ideal background 1 : 3 / 4 cement to sand Allow 3 weeks drying time

Tile Backer Boards No drying time Impervious to water Can over board with 6 mm with manufacture screws and washers also put down with thin bed of adhesive Wedi Boards

Tile Backer Boards Excellent insulation properties for under tile heating Quick and easy to install Lay brick bond effect Wedi Boards

Under Tile Heating Substrate must be clean and dust free Preferably use construction boards for insulation Test heating before tiling checking it works and turn off and allow to cool

Under Tile Heating Cover cables with weber floor flex levelling compound until the warming elements are covered at least 3 mm thick Keep heating off for at least 5 days and then gradually bring the system up to its operating temperature over a few days Video

Heated Screeds When screed is fully dry test under floor heating system (normally about 3 weeks) Turn on at 5 degrees a day up to 45 degrees Run at full temperature for 3 days Allow to cool to 15 degrees

Heated Screeds Using a de-coupling membrane is highly recommended Once tiled switch heating on after 5 days gradually raising the temperature by 5°C/day

Anhydrite Screed Water sensitive Remove weak layer Prime with acrylic primer Video

Minor Substrates Preparation

Vinyl Tiles Remove any loose tiles. Make sure existing tiles securely fixed Don’t tile onto sheet vinyl Make sure tiles are clean (use sugar soap) Can prime for better adhesion Use Highly Polymer modified adhesive

Steel It is not suitable to tile on external steel work If tiling on to internal steel work, you must ensure that the surface is free from grease & rust.

Steel The surface must be primed with a suitable rust inhibiting primer. It is not recommended to use large format tiles Use 2 part adhesive or epoxy

Fibre Glass Must be rigid Allow new GRP to cure for 4 weeks Surface must be clean, dry and free from grease Lightly abrade the surface and remove dust to improve key Use 2 part Adhesive or weber. set pro lite rapid

Adhesive Choice