Wall Tile Adhesives

Ready-mixed adhesive comes in a tub and is used straight from the container — no mixing required. It's the easiest option for most DIY bathroom and kitchen wall tiling jobs. It has a long open time, is forgiving to work with, and is ideal for ceramic wall tiles up to around 300×300mm. The trade-off is that it's wall-only and not suitable for floors, exterior, or larger format tiles.

Cement-based adhesive comes as a powder that you mix with water on site. It's suitable for a much wider range of applications — floors and walls, exterior, large format tiles, porcelain, and natural stone. It requires more preparation but gives you more capability. If you're tiling with porcelain, tiles larger than 300×300mm, or in a demanding environment, cement-based is the right choice.

For a straightforward domestic bathroom with standard ceramic tiles, ready-mixed is perfectly adequate and easier to use. For anything more demanding, choose cement-based.

Porcelain tiles have a very low porosity — they don't absorb water, which means standard ready-mixed adhesives struggle to bond to them reliably. For porcelain wall tiles you need either a D2 classified ready-mixed adhesive or a cement-based adhesive.

From our ready-mixed wall range, BAL White Star Plus and UltraTileFix ProSuper White are both D2 classified and suitable for porcelain tiles up to 150×150mm. For larger porcelain tiles you'll need to move to a cement-based product from our floor and wall adhesive range.

If you're unsure whether your tiles are porcelain or ceramic, check the product specification — porcelain tiles typically have a water absorption of less than 0.5%, whereas ceramic tiles absorb more. The tile packaging or retailer should confirm which type they are.

No — ready-mixed wall tile adhesives are not suitable for floors. They're not designed to withstand the weight and traffic loads that floor tiling is subjected to, and they won't cure hard enough under tiles on a horizontal surface.

If you're tiling both walls and floors in the same room, use a cement-based adhesive from our floor tile adhesive range — all of those products are suitable for both walls and floors, so you can use one product for the whole job.

D1 and D2 are the classifications for ready-mixed wall tile adhesives under the BS EN 12004 standard. The key difference is adhesion strength and water resistance.

D1 adhesives are standard strength and suitable for ceramic wall tiles in normal dry or slightly damp conditions — kitchens and bathrooms with standard ceramic tiles are fine. They're not suitable for porcelain tiles or prolonged water exposure.

D2 adhesives have improved adhesion and water resistance. They're suitable for porcelain tiles (up to 150×150mm), wet rooms, communal showers, and walls subject to movement or vibration. If your project is more demanding than a standard domestic bathroom, D2 is the safer choice.

Both D1 and D2 are ready-mixed and wall-only. If you need flexibility (S1) as well — for example over a substrate that may move — look at the D2TE S1 products or move to a cement-based adhesive.

For ready-mixed adhesives, wait at least 24 hours before grouting. The adhesive needs to dry out fully — if you grout too soon, moisture trapped behind the tiles can prevent the adhesive from curing properly.

For cement-based adhesives, grouting times vary by product — typically 8–24 hours for standard set products, and as little as 2–3 hours for rapid set products. Check the individual product data sheet for the exact time.

In both cases these times assume normal indoor temperatures around 20°C. In a cold or poorly ventilated room the adhesive will take longer to cure — be patient and don't rush the grouting stage.

One practical tip: before you grout, press firmly on a few tiles. If any feel at all loose or move under pressure, the adhesive hasn't set enough yet — wait longer.

For tiles larger than 300×300mm on walls you'll need to move to a cement-based adhesive — ready-mixed products aren't designed for larger formats and don't have sufficient strength to hold heavier tiles reliably.

The most important properties for large format wall tiling are non-slip (so tiles don't slide down before the adhesive sets) and high initial grab. All the cement-based products in our floor and wall range are non-slip, but some have better grab than others — ARDEX X7 Standard Set in particular is noted for its high initial grab which reduces the need for temporary supports.

For very large format tiles or panels over 600×600mm, always back-butter the tile as well as the wall to ensure full coverage, and check the wall is flat enough — any unevenness is far more visible with large tiles.

Also check the weight limit of your wall — plaster has a maximum tile weight of 20kg/m² and plasterboard 32kg/m². Large format tiles can quickly exceed these limits.

Most natural stone wall tiles — slate, granite, travertine, sandstone — can be fixed with any of the cement-based adhesives in our floor and wall range. Always use the white variant to avoid any risk of grey adhesive showing through the stone or grout joints.

The exception is moisture-sensitive stone such as limestone, some marbles, and pale or translucent stones. These can absorb water from a standard cement-based adhesive, causing staining that won't come out. For these stones use an adhesive specifically rated for moisture-sensitive natural stone — from our range, Kerakoll H40 Gel White and BAL Flex One White are both suitable.

If you're not sure whether your stone is moisture-sensitive, wet a small offcut with clean water and see if it darkens. If it does, treat it as moisture-sensitive and choose accordingly.

Ready-mixed wall adhesives are generally not recommended for natural stone — use a cement-based product for better adhesion and reliability.

Yes, in most cases — tiling over existing tiles saves significant time and mess. But there are a few checks to do first.

The existing tiles must be firmly bonded to the wall — tap each tile and listen for a hollow sound. Any loose or hollow tiles must come off before you tile over. A wall with many loose tiles is better stripped back completely.

The surface must be clean and grease-free. Clean thoroughly with a suitable cleaner and rinse well — any grease or soap residue will prevent the new adhesive from bonding.

For ready-mixed adhesives, tiling over existing glazed tiles is not recommended — the smooth glazed surface doesn't provide enough mechanical key. For cement-based adhesives, most products can tile over existing glazed tiles with the addition of a primer or admix — check the individual product data sheet.

Bear in mind that tiling over will add thickness to the wall — check this won't affect window reveals, door frames, or electrical socket positions.

It depends on the wall surface. Many walls don't need priming, but some do.

Plaster — must always be primed before tiling, whether using ready-mixed or cement-based adhesive. Use the primer recommended by the adhesive manufacturer. Two coats are usually required, with the second coat applied at 90° to the first.

Plasterboard — prime before tiling with a cement-based adhesive. Ready-mixed adhesives can usually be applied directly to plasterboard without priming, but check the product data sheet.

Cement render and blockwork — usually don't need priming, but allow adequate drying time first (at least 2 weeks for render, 6 weeks for new blockwork).

Existing glazed tiles — require a specialist primer or admix for most cement-based adhesives. Check the product data sheet for the correct primer.

When in doubt, prime — it's a small extra step that significantly improves adhesion and reduces the risk of tiles coming loose later.

For a domestic shower enclosure, a D2 classified ready-mixed adhesive or a cement-based adhesive is suitable. Standard D1 ready-mixed adhesives are generally not recommended for shower areas as they don't have the water resistance required.

For a full wet room — where water runs freely across the floor and walls — a cement-based adhesive is the better choice for reliability. More importantly, the walls and floor must be waterproofed before tiling. Adhesive alone is not a waterproof barrier, and water that works through grout joints will eventually cause damage to the wall structure behind.

Apply a waterproofing membrane (tanking system) to the walls and floor before tiling — products like BAL Tank-It, Mapei Mapegum WPS, or ARDEX WPC are designed for this purpose. Pay particular attention to the corners and junctions between walls and floor, which are the most vulnerable points.

After tiling, use a suitable flexible sealant (not grout) in all internal corners — grout is rigid and will crack at corners over time, allowing water in.

The technical performance is identical — grey and white adhesives bond just as strongly and last just as long. The difference is purely visual, but it matters more on walls than on floors because the adhesive is more likely to be visible through tiles or grout joints.

Grey adhesive is fine for most ceramic wall tiles in standard colours. It works well under any tile where the adhesive colour won't show through.

White adhesive is the right choice for pale tiles, white or cream tiles, glass mosaics, translucent tiles, and any natural stone where grey might show through the material or bleed into light-coloured grout joints. It's also better for mosaic tiles where small gaps between pieces can reveal the adhesive underneath.

All the ready-mixed adhesives in our wall range are white. For cement-based products, choose the white variant when fixing any light-coloured or translucent material.

Coverage varies depending on the adhesive, the tile size, and the flatness of your wall — so there's no single answer that works for every job.

The easiest way to work it out is to use the adhesive calculator on each product page — just enter your wall area and it will tell you how much you need.

As a rough guide, a 15kg tub of ready-mixed adhesive will cover approximately 6–8 square metres at standard application. A 20kg bag of cement-based adhesive will cover roughly 4–6 square metres on walls depending on the trowel size used.

Always buy a little more than you calculate — walls are rarely perfectly flat, which uses more adhesive than expected, and running out mid-job means stopping work while you wait for more to arrive.