Tile a fireplace hearth

Plan the layout, tile the hearth with heat-resistant adhesive, then grout and seal for a neat, safe finish.

FH-01Make the fireplace safe and clear the roomMake sure any fire or stove is out and completely cold before you start. If it's a gas or electric fire, turn it off at the isolation point. Move furniture back and clear the hearth area so you have room to work.

FH-02Check whether you're changing the hearth's sizeIf you're tiling over the existing hearth at the same size and thickness, you're just refreshing the surface and there's nothing to check. But if you plan to build the surface up, add a raised edge, or extend the hearth's footprint, this can affect the fire safety zone around a stove or open fire.

RULES

KNOW THE RULES

Building Regulations Approved Document J sets minimum hearth size and thickness around fireplaces and stoves. Don't reduce this margin by building up the surface — check with your installer or local building control first if you're changing the hearth's dimensions.

FH-03Protect the surround and floorLay dust sheets over the floor and any nearby carpet. Mask off the fireplace surround and mantel with low-tack tape so adhesive and grout don't mark them. Check the hearth surface is sound, flat, and free of grease, soot or loose paint — sort any of these before tiling.

1 each · Dust sheet

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1 roll · Low-tack masking tape

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FH-04Plan the tile layoutDry-lay your tiles across the hearth without adhesive to work out the layout. Aim for even cuts on both sides rather than a full tile on one edge and a sliver on the other. Mark your starting line with a pencil so you can lay tiles to a straight, checked line rather than just the edge of the hearth, which may not be square.

1 m2 pack · Hearth tiles

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1 pack · Tile spacers

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FH-05Cut the edge and border tilesMeasure each edge and cut tiles to fit around the fireplace opening and the outer edge of the hearth. Dry-fit every cut tile before you commit to sticking anything down, so you're not stuck with a bad cut once adhesive is on the floor.

FH-06Mix a heat-resistant tile adhesiveUse a heat-resistant, fire-rated tile adhesive, not a standard one — a hearth sits close to real heat even if it feels cool now. Mix it to a smooth, lump-free paste following the pack instructions, and only mix as much as you can use in around 20 minutes.

1 5kg tub · Heat-resistant tile adhesive

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FH-07Spread adhesive and lay the main tilesSpread adhesive with a notched trowel over a small area at a time, combing it into ridges. Lay the tiles to your marked line, pressing each one down with a slight twist to bed it in. Use spacers between tiles and check with a spirit level as you go so the surface stays flat.

1 each · Notched trowel

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1 each · Spirit level

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FH-08Fit the cut edge tilesFit the pre-cut tiles around the fireplace opening and outer edges last. Leave a small 2-3mm gap where the tiles meet the fireplace surround itself, rather than butting tightly up against it — this gives a little room for movement as the surround heats and cools.

FH-09Leave the adhesive to cureRemove the spacers after about 20 minutes, while the adhesive is still soft enough to adjust but firm enough to hold the tiles in place. Then leave the hearth completely undisturbed for at least 24 hours before grouting, and don't walk on it.

FH-10Mix and apply the groutUse a heat-resistant grout to match the adhesive. Mix to a firm paste and push it into the joints with a rubber grout float, working diagonally across the tiles so you don't drag grout back out of the joints.

1 3kg tub · Heat-resistant tile grout

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1 each · Rubber grout float

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FH-11Clean off and polish the tilesOnce the grout starts to firm up, after about 30-60 minutes, wipe the tiles with a damp sponge to remove excess grout, rinsing the sponge often. Once the surface is fully dry, buff off any remaining haze with a dry cloth.

1 each · Sponge

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1 each · Microfibre cloth

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FH-12Seal natural stone tiles if you've used themIf you've tiled with a natural stone such as slate, limestone or marble, apply a suitable stone sealer once the grout has fully cured. This protects the stone from staining and heat marks. Skip this step for glazed ceramic or porcelain tiles.

1 500ml bottle · Natural stone sealer

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FH-13Tidy up and leave everything to cure before useClean your tools and buckets before any adhesive or grout sets on them. Remove the dust sheets and masking tape. Don't light the fire or switch on the stove until the adhesive and grout have fully cured — check the pack, but this is usually at least 7 days, since the hearth needs to be fully set before it takes real heat.

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