Celotex FI5000 insulation

Celotex FI5000 Underfloor Insulation

Celotex FI5000 is a high performance flooring insulation board. This high specification insulation board is suitable for concrete slab, beam and block floors , suspended timber and under floor heating insulation. FI5000 provides a superb thermal performance and has been designed with installation efficiency in mind. Featuring a most noteworthy super low lambda of 0.021W/mK. At the time of writing FI5000 complies to UK Building Regulations with better U-values and thinner solutions than a standard PIR insulation board.

Celotex FI5000 uses its best in class PIR Celotex insulation with a new composite facer with a built-in vapour control layer (VCL). This enables direct screed, without this facing a separate damp proof membrane would be required to stop screed reacting with the foil facing. FI5000 under floor insulation has an enhanced compressive strength value of ≥175 kPa making it an ideal solution for a range of floor insulation applications including under floor heating. In addition the insulation board provides minimal downward heat loss and its enhanced density provides good pipe clip retention when installing underfloor heating systems.

When installing Celotex FI5000 it it advisable to install Celotex US4000 as a perimeter upstand insulation to eliminate any possible cold bridging in the floor insulation.

These insulation boards are available to order in usually within 4-5 working days.

For more information on this high performance Celotex insulation board please do call our national sales office. We are happy to provide the best prices and any further information you require.

Celotex FI5000 Underfloor insulation for underfloor heating

CODE: FI5000
SPECIFICATION: 75mm – 125mm
SIZE: 2400mm x 1200mm

special offer boxCelotex FI5000 underfloor insulation
24 sheet deal
Size: 2400 x 1200
Thick: 100mm
Only £POA.00 + vat
Quote: FI5100
Product currently out of stock please call for alternative

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Great service, goods supplied on time , very satisfied

Alan Gibbs

Nice to deal with, quick delivery and cheap prices.

Simon Berrinfield

Top Service From quote to delivery can’t get any better thanks

C Lewis, C Lewis Building

After days of trying to order some Rockwool from suppliers who never got back to me or quoted silly prices, my enquiry to BMD was answered in minutes politely and with clear knowledge of the products and delivery arranged on the phone all at a great price. Top marks for A1 service and product knowledge.

Rich Jenn

Awesome guys sorted me out when i didnt have a clue what to order top geezers

Badders, Holy smoke Vape store

As described quick delivery and good condition thankyou

Nick Wilson

As a small building company we find that BMD will equal or beat our trade depot plus we get free delivery too !!, Also we can get everything in one order and being able to talk to an actual person rather than clicking on a website means we get the service we want. saves time and money whats not to like ? :-)

Clemency Bedford, Bedford Building Maintenance

Good price, good product great service. Thank you

Julie Rhodes,

Very happy with the service we received. Fantastic product at a fantastic price. Cant recommend Jason and the team highly enough. Ordered during Covid-19 when everything was slightly crazy and delayed and Jason called and said they had a lorry in our area so could deliver the very next day! Thank you guys for 5 star service, will be back in the future . All the best, Lacey. Travellers Finds Ltd

Lacey Griffiths, Travellers Finds Ltd

Ordered Celotex insulation from this company for the first time last week and I will definately be back again. Good price and delivery 2 days later thankyou.


Matt Chapman, MC Construction

Good for cheap insulation, i bought some celotex from them and it was delivered last week, it was a lot cheaper than anyone else in my area. i’m very happy with this service.

Rav Kumar

Fantastic Company. Helped with the order from start to finish. Even had an issue my end with the payment and they couldn’t be more helpful.

Mike Reynolds

Thanks for saving my bacon with next day delivery will be back when I need some more Insulation.

Scott Ainsdale, SA Electrical

Excellent company, Jason gave us a really good price and the items were delivered 2 days later much quicker than anyone else could offer. even the delivery driver was incredibly helpful, honestly can’t fault them Jacqui

Jacqueline Jelley,

Dont normally leave reviews but they helped me with products through out my selfbuild and saved me a lot of money

Ady Moon, Moon Building

Ordered online as it was the weekend , recieved a call to arrange delivery day on the Monday morning . all goods arrived in great condition and on the day they said.

Sue Brenner, Holistic regen

Thanks for my order great service

Yanislav Molkiva,

Excellent price and delivery what more can i say , keep it up BMD


Purchsed our floor and wall insulation from this company, they are very helpful and went through the options available to me. after searching about the total price was the best i had so i gave them the order. Deliervy was made in 2 days and everything was fine. I will use them again for the next part of my building project.

James Kergan, JK Building services