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Kingspan TW53 Thermawall Rigid PIR Insulation Boards

Kingspan's popular polyisocyanurate products are available in most popular thickness’s from the manufacturer, in which case short lead-times apply. The most popular board sizes may be available from stock.

High performance Kingspan product, manufactured to order in the following thickness's 20mm, 40mm, 50mm, 60mm, 70mm and 80mm

Product Functions

Thermawall TW53 glass tisue faced rigid external insulation for masonry walls

Thermawall TW53 is a high performance, fibre free, rigid thermoset insulation core with glass tissue facings which is used for external insulation on masonry walls.

Common applications for this product include ...

External Wall Boarding and Rainscreen cladding

Product Description

The Facings

Kingspan Thermawall® TW53 is faced on both sides with a glass tissue based facing, autohesively bonded to the insulation core during manufacture.

The Core

The core of Kingspan Thermawall® TW53 is manufactured with Nilflam® technology, a high performance rigid thermoset polyisocyanurate (PIR) insulant manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP).

Standards and Approvals

Kingspan Thermawall® TW53 is manufactured to the highest standards in accordance with BS 4841–1: 2006 (Rigid polyisocyanurate (PIR) and polyurethane (PUR) products for building end–use applications. Specification for laminated insulation boards with auto–adhesively or separately bonded facings).
Kingspan Thermawall® TW53 is also manufactured to the highest standards under a management system certified to BS / I.S. EN ISO 9001: 2008 (Quality management systems. Requirements), BS / I.S. EN ISO 14001: 2004 (Environmental Management Systems. Requirements) and BS / I.S OHSAS 18001: 2007 (Health and Safety Management Systems. Requirements).
Kingspan Thermawall® TW53 is used as an integral component of several BBA Certified rendered external wall insulation systems. For further details of BBA Certification please contact the Kingspan Insulation Technical Service Department.

Compressive Strength

The compressive strength of Kingspan Thermawall® TW53, typically exceeds 150 kPa at 10% compression when tested to BS / I.S. EN 826: 1996 (Thermal insulating products for building applications. Determination of compression behaviour).

Water Vapour Resistivity

The product typically achieves a resistivity greater than 300 MN.s/g.m, when tested in accordance with BS EN 12086: 1997 / I.S. EN 12086: 1998 (Thermal insulating products for building applications Determination of water vapour transmission properties).


If correctly installed, Kingspan Thermawall® TW53 can have 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 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.
The insulation core and facings used in the manufacture of Kingspan Thermawall® TW53 resist attack by mould and microbial growth and do not provide any food value to vermin.

Product Benefits

    High performance rigid thermoset insulation – thermal conductivities as low as 0.025 W/m.K
    Suitable for use behind both traditional and lightweight polymer modified renders
    Can be used between studs or as an insulating sheathing
    Unaffected by air infiltration
    Resistant to the passage of water vapour
    Easy to handle and install
    Ideal for new build or refurbishment
    Non–deleterious material
    Manufactured with a blowing agent that has zero ODP and low GWP

Product availability indicators

TW55 - Price and Availability Advisory:

Presently there are no availability restrictions, apart from manufacturing lead-times and pack quantity order levels

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 TW53 External Wall PIR 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)

Kingspan TW53 20mm 25 x 0.6m x 1.2m = 18m² 20 0.026 0.75 1.34 0.94 17.00
Kingspan TW53 40mm 12 x 0.6m x 1.2m = 8.64m² 40 0.026 1.50 0.67 1.58 13.68
Kingspan TW53 50mm 10 x 0.6m x 1.2m = 7.2m² 50 0.026 1.90 0.53 1.90 13.70
Kingspan TW53 60mm 8 x 0.6m x 1.2m = 5.76m² 60 0.026 2.30 0.44 2.21 12.80
Kingspan TW53 70mm 6 x 0.6m x 1.2m = 4.32m² 70 0.026 2.65 0.38 2.54 10.98
Kingspan TW53 80mm 6 x 0.6m x 1.2m = 4.32m² 80 0.025 3.20 0.32 2.86 12.36
Thermal conductivity / Lambda value (W/mK) = 0.026 to 0.025 | Compressive Strength (kPa) = > 150 | Water vapour resistance (MNs/g) = > 300 | Fire Performace = N/A | 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.

Kingspan TW55 Datasheet | Kingspan Product Selector | Kingspan Design Manual | Kingspan BBA U-Value Compliancy Cert. | TW55 CE Performance Declaration

Kingspan Kooltherm® TW55 Range - Certification

Kingspan Thermawall® TW55 is manufactured to the highest standards in accordance with BS 4841–1 Rigid polyisocyanurate (PIR) and polyurethane (PUR) products for building end–use applications. Specification for laminated insulation boards with auto–adhesively or separately bonded facings).
Kingspan Thermawall® TW55 is also manufactured to the highest standards under a management system certified to BS / I.S. EN ISO 9001: 2008 (Quality management systems requirements), BS / I.S. EN ISO 14001: 2004 (Environmental Management Systems requirements) and BS /I.S OHSAS 18001: 2007 (Health and Safety Management Systems Requirements).

CE Marking - Kingspan has provided Decelerations of Performance for its products. CE marking is the visible sign, that the product has met the requirements of the European Norms (ENs) and is therefore compliant with the Construction Products Regulation (CPR).

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Product Installation - Kingspan Thermawall TW55

Insulated Render Systems

Due to insulated render systems being proprietary and utilising different mechanisms for attaching insulation to the wall structure, sitework guidance should be sought from the render system manufacturer. However, in the absence of any other guidance, the instructions laid out below may be followed.

The external masonry wall should be clean, flat, and free from protrusions.
Where an uneven surface remains, it is recommended that a bedding compound can be applied prior to fixing the insulation boards.
External wall insulation should start 150 / 200 / 600* mm below the top surface of the ground floor insulation / perimeter insulation upstand (whichever is higher) for a concrete floor, or 200 mm below the top surface of the ground floor insulation / perimeter insulation upstand (whichever is higher) for a suspended timber floor. (150 mm applies to the UK. 200 mm applies to the Republic of Ireland if a row of insulating blockwork (thermal conductivity < 0.20 W/m.K) is used, otherwise 600 mm applies).
Insulation boards should be installed break–bonded, with joints lightly butted.
Care should be taken to install the specified thickness of insulation around reveal)
Boards of Kingspan Thermawall® TW53 are mechanically fixed to the exterior of masonry external walls, preferably using thermally broken telescopic tube fasteners.
A minimum of 5 fixings are required to secure an insulation board to the masonry wall.
Board edges at openings and external corners should be fixed with fasteners at minimum 300 mm centres.
Fasteners at board edges must be located > 50 mm, and< 150 mm, from edges and corners of the board, and not overlap board joints
The requirement for additional fixings is dependent on the render system being applied and the type of fixing being used.
Wherever possible, care should be taken to avoid cold bridging when attaching services and ancillaries to the exterior of the building.
Depending on the render finish being applied, advice must be sought from the render manufacturer on the EML / glass fibre mesh and bedding mortar to be applied.
In refurbishment projects, sill extenders and flashings should be used around openings, with care taken to avoid cold bridging

Linear Thermal Bridging at Openings

Linear thermal bridging describes the heat loss at junctions between elements, where the geometry of the junction means that a building’s primary insulation layer is not continuous or is reduced. This heat loss is represented by the junction’s psi (ψ) value. The ψ–values of all the linear thermal bridges in a building are used in whole building carbon dioxide emissions calculation software.
At a window or door openings, in a wall insulated with Kingspan Thermawall® TW53, the linear thermal bridge is the reveal.
This linear thermal bridge can be avoided, by positioning the window frame so that its outer face is flush with the outer surface of the masonry wall, and overlapping the window frame with the external wall insulation.
If this is not possible, this linear thermal bridge can be reduced by insulating the reveal. The key factor is the thermal resistance (R–value) of this insulation layer.
Reveals should be designed to accommodate the 20 mm of Kingspan Thermawall® TW53 required to achieve an R–value of 0.6 m2.K/W, and the depth of the cladding system

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