FAQs

What are the U values?

There are no u values on cavity closers. The calculation required to meet part L building regulations is the path of thermal resistance. Closers must meet a minimum of 0.45m2KW – all closers from Subframes UK meet this criterion

Do the cavity closers have the required European CE mark?

Unlike windows and glass, CE marks do not apply to cavity closers.

Are all cavity closers fully insulated?

Not all cavity closers are fully insulated. Whether or not a cavity closer is insulated depends on the design of the cavities within the closer. Some cavity closers, including closers from Duraflex, do not require full insulation as long as they meet the 0.45m2KW path of thermal resistance calculation. This means they comply with Part L regulations.

Which is the inside and the outside of the closer?

In general, there is no inside and outside of a closer. As a result, it does not matter with a fully insulated closer. If one lip is longer than the other, the longer side goes to the inside face. However, if only partially filled, then the insulated side of the closer should go to the outside face

How quickly can they be delivered?

Cavity closers can usually be delivered within 7 to 10 Working days, although some products may require longer lead times. For an accurate delivery time, get in touch with the team at Subframes UK. We would be delighted to assist you and answer any questions you have.

What cavity sizes can we supply?

Subframes UK supplies a range of cavity sizes, from 50mm up to 300mm.

Are standard cavity closers fire rated?

In general, standard cavity closers are not fire-rated. However, at Subframes UK we do offer fire-rated cavity closers. For more information, get in touch with our team.

Do you supply 1-hour fire-rated closers?

Yes – Cavalok FlameBlok are available from Subframes UK.

Do you supply closers for steel frame builds (including Metsec)?

Subframes UK do supply steel frame builds, including Metsec. For more information, get in touch with our team. We would be delighted to assist you.

Do you supply closers for timber frame builds?

Subframes UK supplies both standard and fire-rated cavity closers for timber frame builds.

What do you do if it’s a split lintel design?

For split lintel design, Subframes UK recommends a 4-sided cavity closer.

Can windows and doors be fixed directly into a closer?

Windows and doors cannot be fitted with standard closers. However, at Subframes UK, we can supply structural closers which are mainly used for front doors and will meet this requirement.