Why choose HardieBacker?

  •  Quick to install
  •  Strongest on the market
  •  Doesn't fail

HardieBacker board

Moisture sensitive areas like kitchens and bathrooms are particularly prone to the negative influence of water on tile backer boards. Whereas traditional materials such as plywood and plasterboard are liable to break or disintegrate when wet, have confidence that your job will last with a board that stays strong and firm, no matter how damp or wet it gets. Get the best protection against moisture damage when you use HardieBacker® tiling backer board. It’s the floor tiling backerboard of choice wherever superior performance is required.

With its unique cement formulation, HardieBacker cement board has no loose aggregates or fillers, making a strong and uniform tile backerboard.

HardieBacker EZ GRID® 6 mm for floors

Have confidence that your job will last – resisting rot, swelling and warping when exposed to moisture – when you choose 6 mm HardieBacker board. It’s the water-resistant cement backerboard that works perfectly with all types of tile or natural stone flooring.

Our light, easy-to-cut, no-mesh board features our exclusive EZ Grid® recessed pattern, making installation even easier. Install it over an existing timber floor or in conjunction with underfloor heating to optimise heat efficiency. The slim-line 6 mm elevation prevents floor build up and minimizes the transition between floors.

HardieBacker 6 mm is the durable water resistant alternative to plywood for tiling on floors. Just like 12 mm HardieBacker board, it has excellent adhesive properties, ensuring that whatever ceramic or stone tile you use, it will hold strong with applied weights of up to 200 kg/m².

HardieBacker 12 mm cement board for walls

Use the durable, water-resistant alternative to plasterboard for tiling on walls. Our 12 mm thick cement backerboard for tile and stone doesn’t swell, rot or warp, so that your tiling work stays put. 12 mm HardieBacker board is strong: boasting the highest flexibility and up to 3x the compressive strength compared to competitive boards.

HardieBacker board fastens directly to any floor, wall or wooden frame and lines up perfectly with any dry wall, making it particularly quick and easy to install.

Use HardieBacker 12 mm on the floor when additional height is needed. Its fire resistant properties also make it the ideal choice of wall panelling behind a boiler, or even behind a multi-fuel or wood-burning stove.

We have peace of mind that the tiles are mounted onto a backerboard specifically designed for wet areas that will not decay even if exposed to water.

Adrian Holt, Director at Ace Kind Ltd.

Made Better

  • 90% Portland cement and sand
  • No loose aggregate or filler
  • Highest flexural strength and up to three times the compressive strength of competitive cement boards

Installs Better

  • Easy to cut to any size: just score and snap
  • Clean cuts allow edges to align tightly
  • Less dust and debris when cut

Performs Better

  • Unique formulation provides outstanding moisture resistance
  • Excellent heavy tile adhesion

Get the looks

Every house forms part of its scenery, whether urban or rural. That’s why James Hardie products are made to fit in seamlessly. We help to build homes that are in perfect harmony with their surroundings.

Discover ideas & inspiration


Unique fibre cement formulation: Portland cement, sand, cellulose fibre, water, selective additives
The board of preference for wet areas: Use on walls or floors with all types of ceramic or stone tiles thanks to excellent tile adhesion properties
Easy to handle: 6mm: 1200 x 800 x 6 mm
12mm: 1200 x 800 x 12 mm
Light: 6mm: 9 kg per board
12mm: 12.8 kg per board
Strong: Highest flexibility and up to 3x the compressive strength of competitive boards. Holds up to 200 kg/m²
Durable: Backed by a 15-year warranty

Product faq

Can HardieBacker 6 mm be used in a shower wall application?

Yes. HardieBacker 6mm can be used on masonry or stud walls. If used on a stud wall, the perimeters of all boards must be fully supported, this may require the installation of additional horizontal noggins.

Which should I use, HardieBacker 6 mm or HardieBacker 12 mm cement backerboard?

HardieBacker 6 mm is used on floors as it decreases the transition to other surfaces.  It can also be used on masonry walls, or on a stud wall. When placed on a stud wall, an extra noggin is required. HardieBacker 12 mm cement backerboard is ideal for using on stud walls and provides enhanced impact resistance. It can also be used on the floor if addition height build up is required.  Both products hold up to 100 kg/sqm of tile, so either or is approprite for heavy tile.

How do I cut HardieBacker cement backerboard?

HardieBacker cement backerboard should be cut using HardieBacker score and snap knife, available from your stockist.

What is HardieBacker cement backerboard made of?

It is made of 90 % Portland cement and ground sand, 10 % cellulose and selective additives. It contains no asbestos, formaldehyde, gypsum or glass fibre.

Can I use HardieBacker cement backerboard in conjunction with under floor heating?

Yes, HardieBacker cement backerboard is suitable for under floor heating. It should always be placed between the structural timber floor and the heating element. Never place heating under HardieBacker cement backerboard as there is a risk of damaging the system when fixing down the backerboard.

Can I install HardieBacker EZ Grid™ 6mm on the wall?

Yes. However If you are installing HardieBacker EZ Grid 6mm on the wall, you must ensure that all the edges of all boards are fully supported on battens, studwork or cross noggins. This will increase the supporting structure significantly, but is necessary if the product is to perform correctly.

Can HardieBacker cement backerboard be used in wet areas?

Yes, HardieBacker cement backerboard is the ideal product to install in wet areas as it is water resistant. The boards won't rot, expand or contract like plywood and plasterboard.

Do I need to treat HardieBacker cement backerboard before tiling onto it?

No, HardieBacker cement backerboard is ready to tile once installed - just wipe the boards down with a damp cloth to remove any dust prior to tiling.

Where can I buy HardieBacker® cement backerboard?

HardieBacker cement backerboard is available from most leading builders merchants and tile shops. Please check the Dealer Locator tool to find the supplier nearest to you. If you have any difficulties obtaining the product please contact our UK Customer Service department on 0800 068 3103.

In which sizes is the James Hardie saw blade available?

James Hardie saw blade is available in 160, 190, 254 and 305 mm.

The 160 blades have 20 mm bore with a reducer taking it to 16 mm.
The 190 blades have 30 mm bore with a reducer taking it to 20 mm.
On the 254 and 305 mm blades they have a 30 mm bore and no reducer.

Can I fix HardieBacker cement backerboard using a dot and dab technique?

No. HardieBacker cement board is not suited to this type of fixing application. Please refer to our masonry wall instructions.

Can I use HardieBacker cement backerboard outside?

No. HardieBacker cement backerboard is not suitable for external use.

What is the correct fixing pattern for installing HardieBacker 12mm cement backerboard?

Fix HardieBacker cement backerboard sheets on walls with HardieBacker screws for wood or for metal (as the substrate dictates) on all supporting studs at 200mm vertical centres. Keep fixings 15mm from vertical edges and 50 mm up/down from horizontal edges.

Where can I get the 50 mm wide alkaline resistant glass fibre mesh reinforcing tape for HardieBacker cement backerboard?

See your local HardieBacker cement board stockist, or call UK Customer Service on 0800 0683103

Can I paint HardieBacker cement backerboard?

Yes, HardieBacker cement backerboard is suitable for a wide range of paint coatings. We do however recommend that you plaster the board first, to ensure the best possible finish.

Can HardieBacker® board be used in steam rooms?

Yes. HardieBacker board can be used in non-commercial steam room applications without tanking the board.

Can I install HardieBacker cement backerboard on the ceiling?

HardieBacker 12mm can be used in a ceiling application using HardieBacker screws, but it cannot be tiled.

Can I use HardieBacker® cement board to prevent ground water penetrating my cellar?

No. HardieBacker cement backerboard is not a waterproof board. You should seek professional advice regarding the waterproofing of cellar walls and floors.

Can I install HardieBacker cement backerboard over linoleum or vinyl composite tile?

Yes, while it is better to remove all existing floor coverings and fix the HardieBacker board direct to the substrate, HardieBacker cement backerboard can be installed over linoleum or vinyl composite tile. James Hardie does not recommend you install HardieBacker cement backerboard over cushioned vinyl but the boards may be installed over vinyl composite tile. Follow HardieBacker cement backerboard floor installation instructions for complete details. 

Where can I get a HardieBacker score and snap knife?

Your local HardieBacker cement backerboard stockist can provide you with a HardieBacker score and snap knife. Please check the find your supplier tool on our website to find the supplier nearest to you.

Can I use HardieBacker cement backerboard to build up the level of a concrete floor?

No. The primary function of HardieBacker cement board is to provide a water resistant flat surface to tile on, it is not designed for use over concrete.