Winfit

WinFit™ is a universal cavity closer system designed for modern construction. Compatible with PVC-U and timber window and door systems, it simplifies installation, supports Building Regulations compliance and helps improve site efficiency. Manufactured using high levels of recycled content, WinFit™ delivers a practical, sustainable solution for today’s housebuilders, contractors and installers.

WinFit™ cavity closer installed in a cavity wall opening

Why Choose WinFit™?

  • Available for cavity widths from 100mm to 150mm
  • Compatible with all PVC-U and timber window and door systems
  • High screw retention (with structural core)
  • Manufactured using up to 98% recycled PVC-U
EC01 Standard Cavity Closer EPS Foam
EC01 Standard Cavity Closer EPS Foam
EC01 Standard Structural Foam
EC01 Standard Structural Foam
EC11 Check Reveal EPS Foam
EC11 Check Reveal EPS Foam
EC11 Check Reveal Structural Foam
EC11 Check Reveal Structural Foam

Supporting Sustainable Building

Manufactured with sustainability at its core, WinFit™ incorporates high levels of recycled PVC-U to help reduce reliance on virgin materials while supporting responsible construction practices. The result is a cavity closer solution that delivers both environmental and performance benefits.

Testimonials

Subframes UK’s reputation for quality manufacturing and reliable service made them a natural fit for Epwin Window Systems. Their expertise in cavity closers, combined with a commitment to continuous improvement and customer satisfaction, aligns closely with our own values. We are delighted to be working together and look forward to a successful future partnership.

Katrina EarlSales Director, Epwin Window Systems

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

FAQs

Which window and door systems is WinFit™ compatible with?

WinFit™ is compatible with all PVC-U and timber window and door systems, helping simplify specification across multiple projects and system suppliers.

Does WinFit™ support compliance with Building Regulations?

Yes. WinFit™ is designed to support compliance with Approved Document L, helping address thermal bridging around window and door openings.

What cavity widths and core options are available?

The product is available for standard and check reveal cavities in 100mm, 125mm, and 150mm sizes. Options include an EPS core or a structural foam core suitable for applications requiring direct fixing.

How does the product support sustainability?

The WinFit Cavity Closer incorporates up to 98% recycled content sourced through established PVC-U recycling schemes.

How are window and door frames secured into the opening?

Once structural work is complete, frames are dropped into position from the outside of the building and secured with jamb clips.

For applications requiring direct fixing, a recommended 7.5mm diameter screw can be fixed directly through the outer frame into the structural foam core.

What are the key performance qualities of the structural foam core?

The structural foam core remains stable in changing temperatures, moisture, and frost conditions, helping maintain long-term thermal and structural performance.

It is a recycled product that combines low weight, high stability, and excellent thermal insulation properties.

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