Skip to content
Save a huge 20% Off ProWarm with code: PW20

PLUS 20% OFF Selected Heatmiser Thermostats

UK's #1 Underfloor Heating Company - Over 300,000+ Systems Sold!
Fast & Reliable Delivery
Fast & Reliable Delivery
Get a Quote
We'll Beat Any Price
Lifetime Warranty
Lifetime Warranty

Warmup Insulation Boards

From £21.99
Now £21.99
In stock, ready to be shipped
In stock, ready to be shipped
Warmup Insulation Boards
From £21.99
Now £21.99
Contact us

Product advice or want to place an order?

Call our product experts 01268 567016

Fast & Reliable Delivery

For delivery on Tuesday

When ordered before 4pm (On weekdays)
How many boards do I need?
Add your area dimensions and we'll calculate how many boards you need

Warmup insulation boards are a high-quality solution for insulating your floors and walls. These water-resistant tile backer boards are made of extruded polystyrene and are faced on both sides with a fibreglass mesh embedded into a thin cement polymer mortar.

Key Features:

  • Excellent Thermal Insulation: The insulation boards are designed to prevent heat from penetrating down into the substrate below, making them ideal for use with underfloor heating systems. They help improve energy efficiency and reduce heat loss.
  • Robust Load-Bearing Capacity: With a load-bearing capacity of 30 tonnes per square metre, these boards provide a durable and stable surface for tiling.
  • Waterproof and Suitable for Wet Areas: The boards are totally waterproof, making them suitable for use in bathrooms or showers. They create a reliable barrier against moisture and protect your walls and floors.
  • Easy Installation: The boards can be fixed directly onto the substrate without requiring extensive preparation. This saves time and effort during the installation process.
  • Quick Heat-Up Time: In testing, the Warmup insulation boards demonstrated a significant reduction in heat-up time. With Warmup heating products, the heat-up time was cut from over 2 and a half hours to just 20 minutes.

Upgrade your flooring and walls with Warmup insulation boards for enhanced thermal insulation and protection against moisture. These boards are designed to withstand heavy loads, provide excellent thermal performance, and ensure a quick and efficient heat-up time for your underfloor heating system.

Board dimensions 1250mm x 600mm (0.75 m2)
Thickness 6mm, 10mm (standard), 20mm, 50mm
Compressive strength Able to withstand load of 3.0 kg/cm2 (300kN/m2)
U values (W/m2K) 6mm - 4.50, 10mm - 2.70, 20mm - 1.35, 50mm - 0.54
Water absorption (capillary) Nil
Fire rating Class "O" / "B1" (DIN 4102)/ "E" (EN13501-1)

The Warmup insulation board is the perfect system for quality underfloor insulation. Waterproof and unaffected by the freeze/thaw cycle, the Warmup tile backing insulation boards can be installed onto concrete and timber subfloors.

  • Step 1

    Make sure the floor is clean, levelled and dirt free. Using a floor trowel comb a thick bed of tile adhesive over the subfloor. (for best results use a cement based adhesive).

  • Step 2

    Lay the Warmup Insulation board down in place pressing it down firmly. If possible lay the backing boards out in brick like fashion. When tiling the floor leave a 20mm gap from the edge of the wall for the connection to a Warmup thermostat.

  • Step 3

    With the tiles laid ontop seal the joints with a fibreglass mesh. For wet rooms such as bathrooms and showers, you can further waterproof by sealing the joints with waterproof tape or acrylic sealant.

  • Step 4

    Now lay your chosen Warmup heating system onto the Warmup insulation backing board and fix into position. Cover the heating element using your chosen floor type. For guides on how to install heating elements please see their relevant product pages.

Frequently bought with
  • Was
    Now £21.99
  • Total price
    Our reviews speak for themselves!

    Let our experts help you

    Product Question? Need help placing an order?

    Our customer support is available Monday to Friday 7am-6pm.

    Call us on 01268 567 016

    Reach out to our expert team
    Free delivery on all orders

    At The Underfloor Heating Store, we strive to make every step of your order as easy and convenient as possible, from finding the right underfloor heating setup to best suit you to taking delivery of your system the very next day.

    We're proud to offer a range of delivery options to suit you, including free delivery on all of our orders or next working day delivery for a fixed price of £4.99

    • 2-3 working days delivery - FREE (Order before 4pm Monday - Friday)
    • Next working day - £4.99 (Order before 4pm Monday - Friday, applies to orders over £19.99)
    • Next working day before 10.30am - £14.99 (Order before 4pm Monday - Friday)
    • Saturday delivery - £29.99 (Order before 4pm Monday - Friday)
    • Free collection from our Basildon warehouse in Essex

    Explore our full delivery policy

    30 days returns policy

    At The Underfloor Heating Store, our customers have 30 days to upgrade, replace or refund their orders.


    At The Underfloor Heating Store, we want to ensure you are happy with every purchase you make. If you have any issues with your chosen product, whether damaged, faulty or simply an unwanted item, you can simply return what you bought for a refund. Learn more.


    We take great care in the delivery of all of our products, however, in the event of your delivery arriving damaged or if you notice a manufacturing fault of any kind within 48 hours of delivery, you're within your rights to a replacement. Learn more.


    Within 14 days of purchasing from us, you are eligible to upgrade if you deem you want something a little better. Simply send it back to us brand new and we'll happily assist you with an upgrade to your order. Learn more.

    Lifetime warranty

    At The Underfloor Heating Store, we are committed to providing our customers with high-quality products and outstanding customer service. That's why we offer a comprehensive warranty on all of our underfloor heating products, with a lifetime warranty for our ProWarm range of products.

    Our warranties are designed to give you peace of mind and ensure that your underfloor heating system operates reliably for years to come.

    Find out more

    We'll beat any price

    At The Underfloor Heating Store, our main priority is customer satisfaction. To cement our commitment to this, we are proud to offer our Underfloor Heating Price Match Promise. If you find a lower price on an identical product anywhere else, we will match it – guaranteed!

    Discover our promise

    Compare products

    {"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

    Select first item to compare

    Select second item to compare

    Select third item to compare