About Us

Subframes UK is a manufacturer of welded and mechanically jointed cavity closers.

We are the largest trade supplier of cavity closers in the UK. Operating from our Midlands-based factory, our team manufacture high-quality cavity closers for commercial and domestic properties alike.

Over the years, we’ve acquired an industry-wide reputation for being pioneers in cavity closer technology and are well-known to tradespeople, window and door manufacturers, builders and installers across the UK.

Long-lasting insulation and protection

Also known as window formers and frame formers, cavity closers play an essential role in the building process; sealing off the cavity between the brickwork and the blockwork at the structural openings. A byproduct of this is that it protects the building from damp or condensation from entering the cavity. Furthermore, cavity closers stop heat from exiting a building through gaps in the cavity wall.

Our range of cavity closers is subject to rigorous quality control before leaving our factory and delivered daily nationwide using our fleet of unmarked vehicles.

Subframes UK is an approved fabricator of Cavalok, Dacatie and Duraflex as well as offering Kingspan Thermabate & KKCC lengths. We manufacture cavity closers in a wide range of sizes and shapes to suit most window and door openings. As a result, our customers can rest assured knowing the team at Subframes is dedicated to producing the very best cavity closers on the market today, as well as keeping up with the latest technology and consumer demands.

Our team even offer a bespoke service designed to meet the unique specifications of particularly unique homes and commercial properties. Our range of cavity closers is available in a variety of shapes, including circles, arches and ovals, as well as a combination of T or P-shaped flags. They can be produced as 2, 3, or 4-sided, depending on your threshold and lintel. Additionally, Subframes UK can offer vented heads using Titan ventilators. Moreover, we can provide structural and fire-rated frames up to 150mm; as well as standard frames in sizes ranging from 50mm to 300mm.

To achieve a fire rating with cavities above 150mm, Subframes UK can offer Dacasock fire socks from 50mm to 300mm in conjunction with a standard product to close the cavity.

Market-leading cavity closers at Subframes UK

From small jobs to large commercial projects, the experienced team at Subframes UK would be delighted to assist you and ensure you receive the correct cavity closer for the task at hand.

For quotations, product information or technical support please call us on 01773 590100 or email sales@subframes-uk.com.

FAQs

Who is the best cavity closer supplier?

If you’re looking for the very best cavity closer supplier, look no further than the team at Subframes UK! We are the biggest trade supplier of cavity closers in the UK and a leading manufacturer of welded and mechanically joined cavity closers.

From our factory in the Midlands, our team produce high-quality cavity closers for both commercial and residential premises alike. We also deliver daily across the UK, using our very own fleet of unmarked vehicles on a daily basis.

Our knowledgeable staff would be delighted to assist you with your next project. Give us a call today at 01773 590100 for quotes, product details or technical support, or send our team an email at [email protected].

Who makes the best cavity closers?

At Subframes UK, our experienced, professional team create high-quality, innovative cavity closers of the highest possible calibre. Over the years, we’ve cultivated a nationwide reputation for producing the very best cavity closers for commercial and residential properties alike, and are well known to window and door manufacturers, builders, tradespeople and installers across the UK.

Subframes UK is also an approved manufacturer of a number of market-leading cavity closer brands, including Cavalok, Dacatie and Duraflex as well Kingspan lengths.

The team at Subframes UK would be delighted to assist you with your next task. Call us today at 01773 590100 for quotes, product details or technical support, or contact us via email at [email protected].

Where do we make our cavity closers?

Subframes UK manufactures our cavity closers in a 30,000sq ft factory in the heart of the Midlands. Our experienced team boast decades of combined expertise and knowledge, which they utilise to produce our range of market-leading cavity closers.

Our cavity closers are delivered nationwide on a daily basis using our fleet of unmarked vehicles.

For more information about the work we do, give our team a call today at 01773 590100 or contact us via email at [email protected].

What is a cavity closer?

As the name suggests, a cavity closer is a crucial component to act as a seal at structural openings. The main purpose of a cavity closer is to seal off the cavity between the brickwork and the blockwork at the structural openings; a byproduct of this is that it protects the building from damp or condensation from entering the cavity. Furthermore, cavity closers stop heat from exiting a building through gaps in the cavity wall.

Fire-rated cavity closers can also be used to prevent the spread of fire for up to one hour.

As a result, they play an important role in insulating residential and commercial properties alike.

Are cavity closers required?

It is a requirement of ‘Part L’ building regulations that where there is a cavity wall, all structural openings must be closed off. The easiest way to achieve this is by using our pre-formed cavity closers during the building process.

Cavity closers play a crucial role in sealing residential and commercial properties from the impacts of adverse weather. If sealed correctly, they can be effective as a damp proof barrier. Fire-rated cavity closers can also be used to prevent the spread of fire for up to one hour.

What is the difference between a cavity closer and a cavity barrier?

Cavity closers and cavity barriers are both used to seal internal cavities found within the walls of residential homes and commercial properties. A cavity closer is only used around reveals, such as a window or door. A cavity barrier can be used anywhere within a cavity and is designed to stop and restrict smoke or flames from spreading within internal walls. Although fire-resistant cavity closers are available on the market, most are installed for the purpose of preventing water vapour and damp from entering a cavity wall.

How do you install cavity closers?

For more information about installing cavity closers, have a look at our handy installation guide. If you need further assistance, our team would also be delighted to assist you.

For quotes, details about our range of cavity closers or technical support, call Subframes UK today at 01773 590100 or contact us via email at [email protected].