Kingspan Thermabate Cavity Closer


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


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).

It prevents thermal bridging, and the PVC-U box section forms a positive damp proof barrier and key for the direct application of plaster. It effectively prevents condensation, pattern staining and mould growth frequently associated with traditional methods of closing cavities.

The cavity closer is manufactured under a management system certified to ISO 9001: 2015 (Quality Management Systems. Requirements), ISO 14001: 2015 (Environmental Management Systems. Requirements),  ISO 45001: 2018 (Occupational Health and Safety Management Systems) and ISO 50001: 2011 (Energy Management Systems. Requirements with guidance for use).

General information





Polyvinyl chloride, unplasticized (PVC-U)

Extrusion with a rigid thermoset fibre-free urethane insulation core.





3000 mm

Uniclass 2015

Pr_35_90_50_64 Plastics cavity closersPrimary


F30/18 Cavity closers

F30/180 Cavity closers

Specification data - Plastics cavity closers Enhanced data

Third party certification

British Board of Agrément (BBA) Certification.

BBA Certificate 91/2648.



Curved sections.

Flange extension clip.

Jointing clip.

Optional fixing tie.

Profile bracket.

Reveal clip.

Standard flange clip.

To fit cavity width

50 mm.

For 50–60 mm wide cavities.

65 mm.

For 65–74 mm wide cavities.

75 mm.

For 75–84 mm wide cavities.

85 mm.

For 85–94 mm wide cavities.

90 mm.

For 90–99 mm wide cavities.

100 mm.

For 100–110 mm wide cavities.

110 mm.

For 110–120 mm wide cavities.

125 mm.

For 125–130 mm wide cavities.

140 mm.

For 140–150 mm wide cavities.

150 mm.

For 150–160 mm wide cavities.

Length (effective)

3000 mm.

Product Reference

Kingspan Thermabate Cavity Closer

Global warming potential (GWP)

Less than 5.

Ozone depletion potential (ODP)



32 g/cm³.


0.034 W/mK.

Third party certifications

  • BBA Approval Inspection Testing Certificate No 91/2648

Similar products from Kingspan Insulation