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Celotex FI5000 Under Floor Heating Insulation - NEW!

Premium performance flooring insulation solution, suitable for concrete slab, beam and block, suspended timber and underfloor heating flooring applications.

Celotex's new FI5000 range of higher specification boards replaces FF4000 Range.

Product Functions Celotex FI5000 improved compressive strength underfloor heating insulation panels

Celotex FI5000 is a premium performance flooring insulation solution, suitable for a range of flooring applications including concrete slab, beam and block, suspended timber and underfloor heating applications.

Product Description

Celotex FI5000 is a premium performance flooring solution, suitable for concrete slab, beam and block, suspended timber and underfloor heating applications. FI5000 provides thermal performance benefits and has been designed with installation efficiency in mind. Featuring a super low lambda of 0.021W/mK, FI5000 achieves compliance to UK Building Regulations with better U-values and thinner solutions.

Celotex FI5000 combines best in class PIR insulation with an innovative composite facer featuring a built-in vapour control layer (VCL), enabling direct screed, without the need for an additional separating layer. FI5000 features an enhanced compressive strength value of ≥175 kPa making it the ideal solution for a range of flooring applications.

Board size: 1200 x 2400mm, Commonly available in thickness's of 75mm, 100mm and 125mm.

Product Benefits

  • Celotex FI5000 provides thermal performance benefits and has been designed with installation efficiency in mind. Featuring a super low lambda of 0.021W/mK.
  • Celotex FI5000 combines best in class PIR insulation with an innovative composite facer featuring a built-in vapour control layer (VCL), enabling direct screed, without the need for an additional separating layer.
  • FI5000 features an enhanced compressive strength value of ≥175 kPa making it the ideal solution for a range of flooring applications.
  • Ensures minimal downward heat loss into structure
  • Has a highly resistant composite facer featuring a built-in vapour control layer (VCL), enabling direct screed, without the need for an additional separating layer.
  • Uses the foam structure to ensure better pipe clip retention
  • Is easy to cut and install
  • Future proofs the energy performance of new and existing buildings

Product availability indicators

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Availability relies on stock levels at closest depots and upon transport logistics to effect deliveries


Technical Data



Celotex FI5000 Underfloor Heating Insulation Boards

Product Code

Board dimensions

Thickness (mm)

λ Value (w/mK)

R-value (m²K/W)

U Value (W/m²K)

Weight (kg/m²)

Unit weight (kg)

Celotex FI5075 16 x 1.2 x 2.4 = 46.08m² 75 0.021 3.55 0.28 3.36 53.76
Celotex FI5100 12 x 1.2 x 2.4 = 34.56m² 100 0.021 4.75 0.21 4.32 51.84
Celotex FI5125 9 x 1.2 x 2.4 = 25.92m² 125 0.021 5.95 0.17 5.28 47.52

Thermal conductivity / Lambda value (W/mK) = 0.021 | Compressive strength (kPa) = ≥ 175 | Dimensional stability (70,90)3 - DS(-20.-)1.
Please Note: R-Value = Thermal Resistance; U Value = Thermal Transmittance Co-efficient; Compressive strength = kiloPascals; Vapour resistance = MegaNewton seconds per gram.

Celotex US4025 Floor Upstand Rigid PIR Insulation Boards

Product Code

Board dimensions
(16 boards per pack)

Thickness (mm)

λ Value (w/mK)

R-value (m²K/W)

U Value (W/m²K)

Weight (kg/m²)

16 Board weight (kg)

Celotex TB4025 16 x 1.2 x 2.4 = 46.08m² 25 0.022 1.10 0.91 0.73 33.64

New from Celotex ...
US4025 Upstand Insulation for concrete slab and beam & block flooring applications. More information to follow.


Product Information and Certification

Links to manufacturer's information. Click to download in a separate browser window.
Celotex FI5000 Datasheet | Celotex Flooring Certification | Celotex Handy Guide


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    K3 superior performance phenolic boards for use in ground floors, or on supported or suspended concrete and timber floors.

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    Kingspan K3 high performance thermal insulation board faced on both sides with a plain (coated) glass tissue autohesively bonded to the insulation core. The board has a compressive strength that typically exceeds 150 kPa at 10% compression and 125 kPa at 5% compression
  • Kingspan TF70

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    Kingspan Thermafloor TF70, Kingspan Thermapitch TP10, and Kingspan Thermawall TW55, are identical PIR boards.
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    Celotex TB4000 and GA4000 rigid PIR boards for under-floor heating, floor insulation, and perimeter up-stands.

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    Celotex TB4000 and GA4000 General Application Boards thickness's ranging from 20mm to 100mm

Product Installation

Celotex FI5000 products can be installed in accordance with these instructions

Ensure that joist spacing is at no more than 600mm centres and that the dimension of the joist is sufficient to span and accept additional loads. If asphalt weathering is to be used, joists can be at no more than 400mm centres.

Install the insulation boards, ensuring that the long edges are parallel to the line of the joists. 50mm x 50mm cross noggings can be inserted between joists to support the short edges of the boards.

Where boards butt together, bed onto twin beads of vapour sealant wide enough to accommodate this arrangement. This completes the vapour control layer (VCL) when combined with each board’s foil facings.

Lay the boards with the plywood side uppermost and stagger board joints. Leave a gap of approximately 2mm between boards and ensure a minimum 20mm bearing on joists and noggings.

Fix Celotex FI5000 with corrosion-proof Suretwist Composite Panel helical fasteners at a frequency to suit the design wind load. Refer to BS 6399-2 Code of Practice for Wind Loads. As a guide, 16 fasteners per board will resist a wind load of 2.22 KN/m2 based on a design load of 0.4 KN per fastener.

Ensure that fixings are no less than 10mm in from the board edge or 50mm from each corner. They can be equally spaced along the supporting joists. Fixings can be long enough to penetrate at least 38mm into the supporting timber.

Stagger opposing fixings where two board edges share the same joist or noggin.

Provide a complete insulation envelope by extending the wall insulation board up to the underside of the roof deck.

Provide a soffit or ceiling below the joists, as the surface of the product is not designed to be used as a decorative internal finish.

Ensure that the plywood is completely dry before any weathering system is applied.

Always use a Type 3G felt to BS 747 as a vapour diffusion first layer when using BUR weathering systems. When using a single-ply membrane, additional 12mm plywood has to be applied on top of the Celotex FI5000.

Temporary protection must be provided for both the insulation and the waterproofing, if significant foot traffic is anticipated either during or after installation.

Falls

The structure can be designed so that the finished roof has a continuous, smooth and even slope towards the rainwater outlet or gutter. The minimum fall can be 1:80 to avoid ponding water.

Deck stability

Celotex FI5000 incorporates exterior grade WBP plywood to BS 1203, laminated to the surface. This gives the product excellent strength. Boards can span up to 600mm joist centres to provide a suitable substrate for a variety of weathering systems.

Vapour control layer

Celotex FI5000 has a built-in VCL due to the foil facers but this is discontinuous at the board joints. In some applications no further attention to moisture control may be necessary. Celotex would generally recommend the application of a vapour sealant between the tops of the boards at all edges. This is essential in areas of potentially high humidity.


Contact Manufacturer

Celotex Limited

Lady Lane Industrial Estate, Hadleigh, Ipswich, Suffolk, IP7 6BA

Celotex Technical Advisory Service.

Telephone: 0901 996 0100 (30p per minute) - Fax: 01473 820 889
Email: technical@celotex.co.uk
Web sites: Celotex Home Page / Celotex U-Value Calculator.

Contact us

Insulation Online Limited

27 Massetts Road, Horley, Surrey, RH6 7DQ, UK

Telephone: 0333 8000 828

Facsimile: 0333 7000 797

Email: enquiries@insulation-online.com