Frequently Asked Questions
Here are some common questions about using WeatherKem as a Tile Backer Board

Do I need to prime WeatherKem® board before I tile onto it?

No. WeatherKem® tile backer board is pre-primed and ready to tile once installed, just wipe down with a damp sponge to remove any cutting dust prior to tiling.

Which side of WeatherKem® should be tiled on?

Either is acceptable, but we recommend the rough side of the 12mm board.

What is the purpose of treating the joints with sealant and mesh tape?

The alkaline resistant tape reinforces the joint between the sheets of WeatherKem® helping to disapate any movement of the substrate.

Can I fix WeatherKem® boards using the dot and dab method?

No. WeatherKem® is not suited to this type of fixing application. Please see installation instructions.

Can I use WeatherKem® with under-floor heating systems?

Yes. WeatherKem® is suitable for underfloor heating. It should always be placed between the structural timber floor and the heating element.

Can WeatherKem® boards be used in a wet room?

Yes. WeatherKem® is resistant to the effects of moisture. Please contact Kemwell for details of moisture resistant linings and fire rated linings.

Can I finish WeatherKem® tile backer board with anything other than tile?

Yes. WeatherKem® can be painted, plastered, and wallpapered.

Can WeatherKem® 9mm be used on walls?

Yes. Please ensure that all the edges of the board are fully supported on battens, studs or horizontal noggins, with studs at maximum 400mm centres.

How many screws do I need?

For 6mm floor installations, a minimum of 12 per board. For 12mm installations, this is stud centre dependent but allow for at least 20 per board at 400mm stud centres.

Can you install direct to joist?

No. WeatherKem® is not a load-bearing board. Minimum thickness of timber flooring board must be 18mm providing full support to the WeatherKem.

What sheet size and thickness of WeatherKem® are available?

WeatherKem® comes in standard 2400 x 1200 and 6mm, 9mm, 12mm, 15mm and 18mm thick. Other sheets sizes and thicknesses are available on request depending on quantity.


If you need further information or help on using WeatherKem as a tile backer board, please email us on the below form.

Alternatively, please call Sales/Technical support:
T: UK: +44 (0) 333 344 0699
T: Ireland: +353 (0)1 565 3756