Thermal Break Window Retrofit for Old Metal Frames

t503-18

A thermal break window retrofit replaces or upgrades an existing metal window so the frame has an insulating barrier between its inner and outer parts, reducing heat transfer. It is a practical way to improve comfort and energy efficiency in older buildings without losing the character of the original opening.

What a Thermal Break Actually Does

Metal conducts heat very easily. In an old steel or aluminum window, the frame often acts as a bridge that carries heat from the warm inside of a room to the cold outside, and in winter it brings cold back in. A thermal break is a non-conductive strip, usually a polyamide insulator, set between the interior and exterior parts of the profile.

The result is a frame that stays closer to room temperature on the inside surface, which reduces cold drafts and condensation along the edges of the glass.

When a Retrofit Makes Sense

A retrofit is worth considering when the existing frame is still structurally sound but the window feels cold, sweats in winter, or lets in noise and dust. Keeping the original opening size and sightlines is often the main reason owners choose this route over full replacement.

The frame is straight, rust-free at its core, and fixed firmly in the wall
The glass unit can be replaced with a double-glazed insert
The building facade or committee rules call for the original look

How We Approach an Existing Frame

Every retrofit starts with a site visit. We measure the opening, examine the profile section, check for corrosion and note how the sash closes. Photos help, but the final decision depends on on-site measurement.

From there we prepare a drawing and a written specification, so you and your architect or designer can review the proposed profile, glazing and finish before anything goes into production.

Design Choices for Architects and Designers

Retrofit work has to balance thermal performance with the look of the building. Profile depth, sash position and glazing thickness all affect how the window reads from the street. We can match the Belgian steel-look profile style or work to a specific detail your design calls for.

Frame colour and finish should be decided early, because the finishing process affects lead time and the way the surface weathers over the years.

Production, Finishing and Installation

Components are fabricated in our Tel Aviv factory at 37 Rival Street, where the profiles are cut, assembled and prepared for finishing. Hot-dip galvanizing or powder coating is applied depending on the exposure and the desired appearance.

Installation is carried out carefully so the new unit seals properly into the existing opening. Sealing and fixing details matter as much as the profile itself, since air leaks can undo much of the thermal gain.

Standards and Checking the Details

Railings and guarding elements in the same project must meet the Israeli railing standard SI 1142, and window performance should be confirmed against the relevant requirements for your building. We do not guess at exact values. The engineer or energy consultant on your project should confirm the figures that apply to your specific openings.

Frequently asked questions

Can I keep my original metal window frame?

Sometimes. If the frame is straight, solid and free of deep corrosion, it can often be retained and fitted with a thermal break system. A site inspection is the only reliable way to decide.

Does a thermal break window retrofit change the look of the window?

It can be designed to keep the original sightlines and overall appearance. Profile depth and glazing may change slightly, so the design should be reviewed on drawings before production.

Is a retrofit cheaper than full replacement?

It depends on the condition of the existing opening and the chosen profile. Quotations are provided after measurement and specification, so the comparison can be made on your actual project.

Who should approve the design before work starts?

Usually the architect or designer, and where required the building committee. We provide a written specification and drawing so approvals can be given before production begins.

Common mistakes to avoid

Many owners replace only the glass and ignore the frame, or skip proper sealing at installation, which lets cold air bypass the thermal break. Both problems can make an otherwise good upgrade disappointing.

Our recommendation

Measure and inspect the existing frame before choosing a solution, and ask for a drawing that shows the profile section and sealing details. Confirm the specifics with your engineer or energy consultant rather than relying on general figures.

Summary

A thermal break window retrofit can improve comfort and reduce heat loss in old metal frames while keeping the original character of the opening. Careful inspection, a clear specification and correct installation are what make it work.

השאירו פרטים ונחזור אליכם