Tile backer boards calculator

Why use tile backing boards?

Tile backing boards provide a stable, moisture resistant surface for tiling, especially in wet areas. They prevent tile detachment and water damage.

What are XPS cement-coated boards and why are they used?

XPS cement-coated boards are a type of tile backer board made from extruded polystyrene foam coated with cement. They provide a water resistant, durable and thermally insulating surface for tiling in wet areas like showers, bathrooms and areas with underfloor heating.

Why choose XPS boards over traditional backer materials?

XPS boards are lightweight, easy to cut and moisture and mold resistant. They have good thermal insulation, compatible with underfloor heating, unlike traditional materials like plywood which are prone to water damage and dimensional instability.

Are XPS cement-coated boards for wet areas?

Yes, XPS boards are for wet areas and provides a water resistant substrate. The cement coating adds extra durability and they are water resistant, no mold and rot. For best results in wet installations, seal the joints between boards with a waterproofing kit.

Can I use XPS cement-coated boards with underfloor heating?

Yes, XPS boards are compatible with underfloor heating as they have thermal insulation properties. They will improve energy efficiency by directing the heat upwards into the room rather than into the substrate.

How do I install XPS cement-coated boards?

To install XPS boards apply adhesive or screws and washers depending on the substrate. For floors ensure proper adhesive coverage and staggered board placement. For walls ensure all edges are supported by studs or joists. Boards must always be laid in a staggered pattern to get stability and reduce movement.

Do I need to prime tile backing boards before tiling?

Yes, priming XPS boards before tiling will enhance adhesive bonding and prevent moisture absorption. Use a diluted primer and apply evenly, make sure the surface is clean and dry for best tile adhesion.

How much weight can XPS cement-coated boards hold?

XPS boards provides a stable surface that can hold significant tile weight, enough for most interior tiles. The cement coating adds extra load bearing capacity compared to other foam based backer boards, suitable for walls and floors of tiled areas.

How do I cut XPS cement-coated boards?

XPS boards are easy to cut with a utility knife or saw. Always score with a straight edge and snap for clean cuts. For intricate shapes use a utility knife with a new blade.

Do I need to seal the joints between XPS boards in wet areas?

Yes, when installing in wet areas like showers, the joints between XPS boards should be sealed with a waterproofing or tanking kit. This will create a watertight barrier and preserve the boards moisture resistant properties and prevent leaks.

What thickness of tile backing board should I choose?

It depends on your project. Thicker boards are more rigid and insulating, thinner boards are for overboarding existing surfaces.

How do I exclude areas?

You can input the dimensions of areas to exclude, like doors, windows or shower trays. These will be subtracted from the total coverage area to give you an exact calculation.

Can I use the calculator for multiple rooms?

Yes, just enter the number of rooms and the calculator will calculate the total.

Why exclude areas?

Excluding areas will help you buy the right amount of material and avoid waste and costs.