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Kingspan Kooltherm K10 Phenolic Soffit Board

High performance Kingspan product, available in most popular thickness’s from the manufacturer, therefore short lead-times apply. This Kooltherm Range includes the following readily available product thickness's 75mm and 85mm. Manufactured to order are the following thickness's 25mm, 30mm, 50mm, 60mm, 70mm, 80mm, 90mm and 100mm

Product Functions This super high performance, fibre-free rigid thermoset insulation core, sandwiched between an upper tissue-based facing and a lower facing of highly reflective aluminium foil autohesively bonded to the insulation core during manufacture

K10 Phenolic Soffit Boards are light-weight, premium performance, rigid phenolic insulation boards, designed for use under structural ceilings.

Product Description

The Upper Facings

The upper facing of K10 Soffit Board is a tissue based facing bonded to the insulation core during manufacture.

The Lower Facing

The lower facing of K10 is a composite foil bonded to the insulation core during manufacture. The lower facing used on K10 Soffit Board has not been designed with the purpose of an aesthetic finish as its primary function.
Where appearance is critical, advice should be sought from the Kingspan Insulation Technical Service Department (see below).

The Core

The core of K10 is a premium performance CFC/HCFC free rigid phenolic insulant of typical density 35 kg/m3.


K10 is manufactured without the use of CFCs/HCFCs and has zero Ozone Depletion Potential (ODP).

Compressive Strength

Typically exceeds 100 kPa at 10% compression when tested to BS EN 826: 1996 (Thermal insulating products for building applications. Determination of compression behaviour).

Water Vapour Resistance

Modified to include board facings, the boards achieve a resistance far greater than 100 MN.s/g, when tested in accordance with BS 4370–2: 1993 (Methods of test for rigid cellular materials. Methods 7 to 9)


If correctly applied, Kingspan Kooltherm K0 Cavity Board has an indefinite life. Its durability depends on the supporting structure and the conditions of its use.

Resistance to Solvents, Fungi & Rodents

The insulation core is resistant to short–term contact with petrol and with most dilute acids, alkalis and mineral oils.
However, it is recommended that any spills be cleaned off fully before the boards are installed. Ensure that safe methods of cleaning are used, as recommended by the suppliers of the spilt liquid.
The insulation core is not resistant to some solvent–based adhesive systems, particularly those containing methyl ethyl ketone. Adhesives containing such solvents should not be used in association with this product.
Damaged boards or boards that have been in contact with harsh solvents or acids should not be used.

Product Benefits

    Premium performance rigid phenolic insulation – thermal conductivity as low as 0.021 W/m.K
    Utilises traditional cavity wall construction methods.
    Clear cavity is maintained – resists moisture penetration.
    Low emissivity foil facings are resistant to the passage of water vapour and double the thermal resistance of the cavity.
    Meets NHBC technical requirements when used with a 50 mm residual cavity.
    Unaffected by air movement.
    Easy to handle and install.
    Non–deleterious material.
    CFC/HCFC free with zero Ozone Depletion Potential (ODP).

Product availability indicators

K10 - Price and Availability Advisory:

Presently there are no availability restrictions, apart from manufacturing lead-times and minimum quantity order levels on the 25mm, 30mm, 50mm, 60mm, 70mm, 80mm, 90mm and 100mm boards

Excellent = Product Availability Excellent Good = Product Availability Good Fair = Product Availability Fair Poor =  Product Availability Poor Undetermined = Product Availability Undetermined
Availability relies on stock levels at closest depots and upon transport logistics to effect deliveries

Technical Data

Kingspan K10 Phenolic Insulation Boards for cavity wall applications

Product Code

Board dimensions

Thickness (mm)

λ Value (w/mK)

R-value (m²K/W)

U Value (W/m²K)

Weight (kg/m²)

Unit weight (kg)

Kingspan K10 25mm 12 x 1.2m x 2.4m = 34.56m² 25 0.021 1.15 0.87 1.05 3.03
Kingspan K10 30mm 10 x 1.2m x 2.4m = 28.8m² 30 0.021 1.40 0.72 1.22 3.52
Kingspan K10 50mm 6 x 1.2m x 2.4m = 17.28m² 50 0.020 2.50 0.40 1.92 5.53
Kingspan K10 60mm 5 x 1.2m x 2.4m = 14.4m² 60 0.020 3.00 0.34 2.27 6.54
Kingspan K10 70mm 4 x 1.2m x 2.4m = 11.52m² 70 0.020 3.50 0.29 2.62 7.55
Kingspan K10 75mm 4 x 1.2m x 2.4m = 11.52m² 75 0.020 3.75 0.27 2.80 8.07
Kingspan K10 80mm 4 x 1.2m x 2.4m = 11.52m² 80 0.020 4.00 0.25 2.97 8.56
Kingspan K10 85mm 3 x 1.2m x 2.4m = 8.64m² 85 0.020 4.25 0.24 3.15 9.08
Kingspan K10 90mm 3 x 1.2m x 2.4m = 8.64m² 90 0.020 4.50 0.23 3.32 9.57
Kingspan K10 100mm 3 x 1.2m x 2.4m = 8.64m² 100 0.020 5.00 0.20 3.67 10.57
Thermal conductivity / Lambda value (W/mK) = 0.021 to 0.020 | Compressive Strength (kPa) = > 100 | Water vapour resistance (MNs/g) = > 100 | Fire Performace = Class 0 | Please Note: R-Value = Thermal Resistance; U-Value = Thermal Transmittance Co-efficient; Compressive Strength = kiloPascals; Vapour resistance = Meganewton second gram

Product Information and Certification

Links to manufacturer's information. Click to download in a separate browser window.

Product Installation - Kingspan K10

Fixing Directly to Concrete Soffits

Being fitted below a flat concrete roofK10 Soffit Board can be fully restrained to a concrete soffit by the use of 11 No. approved insulation fasteners with a minimum head diameter of 35 mm.
The fasteners should be evenly distributed over the whole area of the board and must offer a minimum 40 mm penetration into a solid substrate. Board joints should preferably be staggered.

Fixing to Timber Battens / Proprietary Grid Systems

Alternatively, a treated timber batten lay-out may be adopted if there is an uneven surface or mechanical services present and direct fixing is not possible. 50 mm x 25 mm battens should be placed at 600 mm centres to coincide with the edges / centre of the boards. The battens should be fixed to the soffit by the use of a suitable fixing method e.g. shot-fire may be considered.

K10 should then be fixed to the treated timber battens using suitable fixings. These should be placed at maximum 300 mm centres (maximum 200 mm when using nails into timber) in rows not greater than 600 mm apart.

K10 can also be fixed to a proprietary grid system comprising metal furring bars.

Manufacturer's advice should be sought regarding the type and required number of fixings for such applications. Please contact the Kingspan Insulation Technical Service Department (see below) for further information.

Fixings should be not less than 12 mm from board edges.Concrete floor soffit being applie with suitable insulation
Exposed joints should be covered with a suitable cover strip.
For aesthetic appearance, consideration may be given to the application of a PVC cover strip at board joints.

For advice on alternative fixing refer to:
EJOT UK Ltd - Telephone: +44 (0) 1977 687 040 -
Hilti Ltd - Telephone +44 (0) 800 830 858 -


Cutting should be carried out either by using a fine toothed saw, or by scoring with a sharp knife, snapping the board over a straight edge and then cutting the facing on the other side.

Ensure accurate trimming to achieve close butting joints and continuity of insulation.

Contact Manufacturer

Kingspan Limited

Kingspan Kooltherm Phenolic Foam, Therma PIR, and Styrozone Polystyrene range of rigid insulation boards

Pembridge, Leominster, Herefordshire, HR6 9LA

Kingspan Technical Advisory Service.

Telephone: 01544 388 601 - Fax: 01544 388 888
Email:  /
Web sites: Kingspan Home Page / Kingspan U-Value Calculator.

Contact us

Insulation Online Limited

Sales Office only:

39 Normandy Road, Worthing, West Sussex, BN14 7DX, UK

Telephone: 0333 8000 828