Home > Companies > Kingspan Insulation > Kingspan Thermabate and Kingspan Thermabate PLUS

Insulated cavity closers for closing cavities around wall openings in masonry cavity, timber frame and steel frame system (SFS) wall constructions.

Kingspan Thermabate is a cavity closer box section comprising an unplasticized (PVC-U) extrusion with a high performance fibre–free rigid thermoset urethane insulation core manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP).

Thermabate and Thermabate PLUS prevent thermal bridging, and the PVC-U box section forms a positive damp proof barrier and key for the direct application of plaster.

Thermabate and Thermabate PLUS effectively prevent condensation, pattern staining and mould growth frequently associated with traditional methods of closing cavities.

Kingspan Thermabate and Thermabate PLUS are manufactured in accordance with ISO 9001: 2015 (Quality Management Systems. Requirements), ISO 14001: 2015 (Environmental Management Systems. Requirements), BS OHSAS 18001: 2007 (Occupational Health and Safety Management Systems. Requirements) and ISO 50001: 2011 (Energy Management Systems. Requirements with guidance for use).

Standard product features


The rigid urethane insulation core is contained within a PVC-U extrusion.

Thermal conductivity of Thermabate and Thermabate PLUS:

0.034 W/m·K.

Fire performance:

Details on the fire performance of Kingspan Insulation products may be obtained from the Kingspan Insulation Technical Service Department.

Responsible sourcing:

Certified to BES 6001 (Framework Standard for the Responsible Sourcing of Construction Products) for boards produced at Kingspan Insulation’s Pembridge manufacturing facility.



  • Standard flange clip: For use as a weathercheck, for fixing closer profiles to window frame and for retaining partial fill insulation batts in the cavity.
  • Reveal clip: Aids construction of check reveals and gives added protection to the frame.
  • Flange extension clip: Clips over Kingspan Thermabate® and Thermabate® PLUS to extend the width of the fixing flange. It enables positive fixing of the frame over suspect masonry.
  • Jointing clip: Connects two sections for use in cavities greater than 110 mm wide.
  • Profile bracket: These brackets have been developed to enable Kingspan Thermabate® rigid box sections to be formed into a frame. This is built in as the work proceeds and creates a pre-formed opening into which the window frames can later be fitted.
  • Optional fixing tie: An optional fixing and is particularly useful for wider cavities. The tie is designed with different angled ends which slot securely between the tee flanges at the 'back' of the Kingspan Thermabate® and Thermabate® PLUS section and keys fully into the mortar bed joint of either masonry skin. They are moulded PVC-U supplied in packs of 150.
  • Curved sections: Kingspan Thermabate® can be factory formed to any specified radius for the bullseye windows, curved heads etc.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-25-20/455 Plastics cavity closers

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Kingspan Insulation


+44 (0)1544 388601

Product reference

[Kingspan Thermabate 50]
For 50–60 mm wide cavities.
[Kingspan Thermabate 65]
For 65–74 mm wide cavities.
[Kingspan Thermabate 75]
For 75–84 mm wide cavities.
[Kingspan Thermabate 85]
For 85–94 mm wide cavities.
[Kingspan Thermabate 90]
For 90–99 mm wide cavities.
[Kingspan Thermabate 100]
For 100–110 mm wide cavities.
[Kingspan Thermabate 110]
For 110-120 mm wide cavities.
[Kingspan Thermabate 125]
For 125-130 mm wide cavities.
[Kingspan Thermabate 140]
For 140-150 mm wide cavities.
[Kingspan Thermabate 150]
For 150-160 mm wide cavities.
[Kingspan Thermabate PLUS]
Made to order, to specified opening size. Kingspan Thermabate sections can be joined to accommodate wider cavities of up to 200 mm.


[Standard flange clip]
[Reveal clip]
[Flange extension clip]
[Jointing clip]
[Profile bracket]
[Optional fixing tie]
[Curved sections]

Manufacturer details

Kingspan Insulation Ltd,
Herefordshire, HR6 9LA
Tel +44 (0)1544 388601
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