020 8689 4187
Trade | Grout Colour Guide | Blogs | Free Tile Samples | Contact US

Free UK Delivery on Orders Over £450

20% OFF on All Tiles!

Hurry — offer ends 31st December 2025!

ThermoSphere HDF Overlay Board 1.2m x 0.5m x 7mm (4 pairs)
ThermoSphere HDF Overlay Board 1.2m x 0.5m x 7mm (4 pairs)

ThermoSphere HDF Overlay Board 1.2m x 0.5m x 7mm (4 pairs)

Non-Stock | 1–2 Working Days | Direct from Manufacturer

Description

ThermoSphere HDF Overlay Boards for Underfloor Heating Systems

ThermoSphere HDF Overlay Boards are expertly designed for use over ThermoSphere floating foil underfloor heating systems, providing an ideal subfloor solution before installing carpet or vinyl floor finishes. These high-quality boards are engineered to optimize heat transfer, ensure durability, and simplify installation, making them a critical component for achieving a comfortable and efficient heated floor.

For installations involving carpet or vinyl floor coverings over ThermoSphere Foil underfloor heating systems, ThermoSphere HDF Overlay Boards provide the perfect solution. These boards are specifically designed to be laid over floating foil heating systems, delivering a smooth, stable surface ready for final floor finishes.

Each overlay board is constructed from high-quality High-Density Fibreboard (HDF), comprising a 3mm baseboard and a 4mm top board, engineered for durability and excellent thermal performance. The boards feature a low thermal resistance, allowing efficient heat transfer from the underfloor heating system into the room, ensuring a warm and comfortable surface.

To ensure a strong and lasting installation, both layers are coated with a pressure-activated contact adhesive, creating a full-surface, permanent bond once applied. Vinyl flooring can be directly adhered to the overlay boards, while carpet can be installed over the top using appropriate underlay and grippers.

ThermoSphere HDF Overlay Boards offer a quick, clean, and efficient floor preparation system—optimised for use with electric foil heating and designed to support high-quality floor finishes without compromising heating performance.

Technical Info

Type Heating Mats
Brand ThermoSphere
Height (mm) 0
Model Board
Size 2.88m2
Width (mm) 0

Reviews

Reviews

Product Questions

Product Questions

Delivery & Returns

Delivery & Returns
Delivery Information

Delivery Costs:

Delivery fees are calculated based on the weight of your order and your delivery location. You can use the delivery fee calculator in your basket or on the checkout page to find the exact cost.

Delivery Area:

We currently only deliver to UK Mainland and the Highlands. We do not deliver to the Islands, Ireland, or Northern Ireland.

Next Working Day Delivery (Subject to Stock Availability):

Orders placed before 12:00 pm (noon) will be delivered the next working day, excluding weekends and holidays. This service starts from £6.50 (including VAT) and the final cost is based on the weight of your order and your delivery location. You can check the exact cost in your shopping cart or on the checkout page by entering your postcode.

Cut-off Time for Genesis Products (Non-Stocked): 11:00 am

NO Next Day Service - Scotland:

We are unable to offer next-day service to the following postcode regions in Scotland.

Postcode: AB, IV, KW, PA .

Economy Service (2-3 Working Days):

This service is only available for orders over 50kg. There is no additional charge for this service.

Sample Orders:

All sample orders are shipped for free via Royal Mail Tracked 48 or 24 service. Delivery typically takes 1-3 working days.

Delivery Methods:

Non-sample orders under 50kg will be dispatched via DPD or APC Overnight. Non-sample orders over 50kg (quarter, half, and full pallets) will be dispatched via Palletways or Kandrmason (Kerbside delivery only).

Order Online & Collect In-Store!

Simply place your order online and choose the Click & Collect option at checkout.

We'll email you once your order is ready for pickup at your chosen store.

Collection hours: Monday - Friday: 8:30 am to 4:30 pm

For more information, please visit our Delivery Information page.

Returns Information
  • Please inspect your order for any damages upon delivery and notify us immediately if you find any.
  • We will replace any items that are damaged during transit.
  • We accept returns within 30 days of delivery.
  • Customers are responsible for the cost of returning items.
  • We will process returns and refunds promptly once the items are received at our warehouse.

Returning Trims

Schluter Trims:

  • Returning trims - 35% restocking fee applied.
  • Returning trim with replacement - 15% restocking fee applied.
  • Customers are responsible for arranging the return.
  • If we arrange a return collection, a £35 return item collection fee will be applied.

Mapei-Profilpas Trims:

  • A 20% restocking fee will be applied (item must be in re-sellable condition).
  • The customer is responsible for returning the item.

For more information, please visit our Return & Exchange page.

Delivery Costs:

Delivery fees are calculated based on the weight of your order and your delivery location. You can use the delivery fee calculator in your basket or on the checkout page to find the exact cost.


Delivery Area:

We currently only deliver to UK Mainland and the Highlands. We do not deliver to the Islands, Ireland, or Northern Ireland.


Next Working Day Delivery (Subject to Stock Availability):

Orders placed before 12:00 pm (noon) will be delivered the next working day, excluding weekends and holidays. This service starts from £6.50 (including VAT) and the final cost is based on the weight of your order and your delivery location. You can check the exact cost in your shopping cart or on the checkout page by entering your postcode.


Cut-off Time for Genesis Products (Non-Stocked): 11:00am


Economy Service (2-3 Working Days):

This service is only available for orders over 50kg. There is no additional charge for this service.


Sample Orders:

All sample orders are shipped for free via Royal Mail Tracked 48 or 24 service. Delivery typically takes 1-3 working days.


Delivery Methods:

Non-sample orders under 50kg will be dispatched via DPD or APC Overnight. Non-sample orders over 50kg (quarter, half, and full pallets) will be dispatched via Palletways or Kandrmason (curbside delivery only).


ORDER ONLINE & COLLECT IN-STORE!

Simply place your order online and choose the Click & Collect option at checkout.
We'll email you once your order is ready for pickup at your chosen store.
Collection hours: Monday - Friday: 8:30 am to 4:30 pm


For more information, please visit our Delivery Information page.

- Please inspect your order for any damages upon delivery and notify us immediately if you find any.

- We will replace any items that are damaged during transit.

- We accept returns within 30 days of delivery.

- Please note that customers are responsible for the cost of returning items.

- We will process returns and refunds promptly once the items are received at our warehouse.


Returning Trims
Schluter Trime
Returning trims - 35% restocking fees applied.
Returnign trim with replacement - 15% restocking fees applied
Customers are responsible to arrange returning the item.
If we arrange a return colleciton, a £35 return item collection feed will be applied.


Mapei-Profilpas Trims
A 20% restocking fee will be applied. (Item must be in re-sellable condition)
The customer is responsible for returning the item.


For more information, please visit our Return & Exchange page.