Cavity Closers

Subframes Ltd are United Kingdom’s leading manufacturer of cavity closer systems. Our UPVC cavity closers are perfectly insulated and are designed to fill any cavity between your windows, doors and walls. Subframes will only supply cavity closer systems from a selection of the best cavity closer manufacturers and brands.

If it’s making sure your house is well insulated or adding a layer protection from water or fire damage, Subframes’ cavity closers systems are the perfect solution.

Cavalok Cavity Closers

Eurocell is the UK’s number one for PVC-U. They are the leading manufacturer, distributor and recycler in the UK because of their precision extrusion, excellent customer service and continued product innovation. Since 1974 Eurocell have been committed to developing products that meet the changing needs of architects and specifiers as well as fabricators and installers to ensure that energy efficiency, sustainability and aesthetics are integral to all developments using their products. It is their window, door, conservatory and roofline products that have established them as the nation’s number one but their acquisition of Merritt Plastics recycling and Cavalok have entrenched them as a marketing leader for recycling and sustainable products.

Read More

Dacatie Cavity Closers

Dacatie Building Solutions is the manufacturer and supplier of the original range of Insulated Cavity Closers for the UK construction market.

As a market leader, the Dacatie brand gives specifiers and building contractors the assurance of the essential Building Regulation compliance in the construction of cavity walls in the area of reveals around windows and doors.

Read More

Duraflex Cavity Closers

Duraflex is one of the largest extruders of PVCU profile for the Window Industry in the UK. They supply Householders, Builders, Developers, Local Authorities and Housing Associations through a nationwide network of window fabricators and installers.

Backed by over twenty five years of PVCU extrusion experience in the window and door sector, Duraflex create the ideal environment for innovative product design, quality production, reliable logistics and all the necessary customer support services.

Read More

Kingspan Cavity Closers

Kingspan Kooltherm® Cavity Closer is a PVC–U extrusion with a rigid thermoset insulation core, manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP). It is manufactured in thirteen sizes from 50–150 mm. Jointing clips extend the range further by allowing the Kingspan Kooltherm® Cavity Closer sections to be joined to suit cavity widths of up to 300 mm. It is suitable for use with timber, metal or PVC window frames and can also be supplied to order in curved sections.

Read More

Titon Vents

Trimvent Select XS13 & XS16 are semi recessed clip fix plastic slot ventilators that fits into an 18mm slot in a window overhead section or cavity closer and provides an Equivalent Area (EA) of 4600mm² (XS16) or an EA of 4400m²(XS13) when fitted with a pair of GS18 grilles.

Read More

Custom Closer

We able to offer the choice of cavity closer profiles from the majority of the UK’s We can serrate any profile to facilitate fitting into almost any structure.

Custom Cavity Closers

Structural Door Packs

With our range of cavity closers, close cavities quickly and effectively, whilst improving the thermal efficiency for homeowners.

Read More

For quotations, product information or technical support please call us on 01773 590100, fax 01773 590200 or email

Quick Enquiry