Lay natural stone floor tiles on a concrete floor — HomeGraft

Prepare, prime, lay, cut, grout and seal natural stone tiles on a concrete floor in one session.

ST-01Check the concrete floor is readyThe floor must be flat, dry, clean and free of dust, oil or old adhesive. A new concrete slab needs roughly 6 weeks' drying time per 25mm thickness before tiling, so don't rush a fresh pour. Check for damp with a damp meter if you're unsure, and check for a damp-proof membrane if the slab is at ground level. If the room has underfloor heating, turn it off at least 24 hours before you start and leave it off until the adhesive and grout have fully cured.

1 each · Damp meter (hire or buy)

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1 5L · Floor primer/SBR bonding agent

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ST-02Plan the layout before you mix anythingMeasure the room and find the centre point of each wall, then snap two chalk lines crossing at 90° in the middle of the room. Dry-lay a row of tiles along each line with spacers to check you won't end up with slivers of tile at the edges. Adjust your starting point sideways if needed so the cut edge pieces are roughly even and at least half a tile wide.

1 each · Chalk line

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1 pack of 200 · Tile spacers (10mm, for natural stone)

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ST-03Seal absorbent stone tiles before layingMany natural stones — limestone, travertine, sandstone — are porous and will soak up adhesive, causing dark staining on the surface. Wipe or spray a coat of impregnating pre-sealer on the back and edges of each tile before laying, and let it dry fully. Dense stones like granite usually don't need this step, so check the supplier's instructions for your specific stone.

1 1L · Natural stone impregnating pre-sealer

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1 pack of 50 · Disposable gloves

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ST-04Mix the right adhesive for natural stoneUse a flexible, rapid-set cement-based adhesive designed for natural stone — standard adhesive can be too wet and cause staining or poor bond. For light-coloured stone (marble, limestone), use a white, non-staining adhesive so grey adhesive doesn't show through. Mix small batches so it doesn't go off before you've used it, following the bag's water ratio exactly.

4 20kg bag · Flexible rapid-set tile adhesive (natural stone grade)

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ST-05Lay the field tiles from the centre outSpread adhesive with a notched trowel along one chalk line, comb it in one direction, then bed each tile with a slight twist. Use spacers to keep joints even and check level constantly with a spirit level, tapping high tiles down with a rubber mallet. Work outwards a small section at a time and wipe excess adhesive from the joints before it goes off, since dried adhesive is very hard to remove from stone.

1 each · Notched trowel (12mm)

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1 each · Rubber mallet

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1 each · Spirit level (600mm)

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ST-06Cut edge tiles and tiles around pipesCutting natural stone produces fine silica dust, which is a recognised lung hazard if breathed in over time. Use a wet tile saw so the water suppresses the dust, work in a ventilated space or outdoors, and wear an FFP3 dust mask, safety glasses and ear defenders. Measure each gap carefully, mark the tile, and for pipes use a diamond hole saw or nibble the hole with tile nippers.

1 day · Wet tile saw hire (day rate)

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1 pack of 10 · FFP3 dust mask

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1 set · Diamond hole saw set

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ST-07Leave the adhesive to cureLeave the floor untouched for at least 24 hours, or longer in a cold room, before walking on it or grouting. Check the adhesive bag for the exact cure time, as rapid-set products vary. Keep the room ventilated but not draughty while it cures.

ST-08Grout the jointsUse a grout suitable for natural stone — many stones stain easily, so an epoxy or specially formulated non-staining grout is often worth the extra cost, especially on light stone. Push grout into the joints diagonally with a rubber float, then wipe off the excess with a damp sponge before it dries on the surface. Buff off the remaining haze with a dry cloth once it's touch-dry.

2 5kg tub · Non-staining or epoxy grout (natural stone grade)

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1 each · Grout float

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1 each · Grout sponge

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ST-09Seal the finished floorOnce the grout has cured — usually 48 to 72 hours — apply an impregnating sealer over the whole floor, including the grout lines. Most natural stone floors need two coats for proper protection against staining and water damage. Keep the room ventilated while the sealer cures and check the tin for how long before you can walk on it normally.

1 1L · Impregnating stone and grout sealer

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1 pack of 10 · Lint-free applicator cloths

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ST-10Refit trims and tidy upRefit any skirting or door thresholds you removed, leaving a small gap at the wall edge for expansion, which can be covered by the skirting. Sweep up stone off-cuts and dust, and dispose of leftover adhesive and grout as normal household waste once fully dried. Give the floor a final light clean with a stone-safe pH-neutral cleaner rather than anything acidic.

1 1L · pH-neutral stone floor cleaner

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