TruFit Expanding Window Installation Tape

An Average of 23% Less Heat Loss

In a standard installation the perimeter of the window is the weakest point when it comes to heat loss. Modern windows and doors are designed to be energy-efficient, but if they are not properly installed you may not be getting the full energy-saving benefits you have paid for.

Edgetech put TruFit into the test lab, and it proved to retain more heat than traditional wet sealants — an average of 23% less heat loss than traditional installation methods. That consistently reduces draughts and cold spots, protecting the energy rating of the windows you fit.

Why Installers Fit with TruFit

• Quicker and cleaner than silicone — no bead to apply and no mess, which keeps frames and uniforms clean
• Not affected by rain — installation companies lose fewer days to adverse weather
• No scribing needed — the tape expands to seal the spaces between wall and frame, giving a straight line that is pleasing to the eye, even in stone and brick apertures with indentations and jagged edges
• Better on coloured frames — no hit-and-miss silicone colour matching, and no overspill onto the profile
• An average of 23% less heat loss than traditional installation methods, minimising cold spots
• Recognised in BS 8213-4:2016, with GQA assessors trained in its application
• Quick to adopt — it takes only a few installations to get used to the fitting method
• Enhance your IGUs with warm edge spacer bars → /our-products/spacer-bars
• Enhance your IGUs with warm edge spacer bars

Fit and Forget

Download our TruFit Product Guide

TruFit is warm edge for windows. It provides an effective thermal barrier at the edge
gap between the window or doorframe and the reveal – ensuring true energy rating
performance and a long-life weathertight seal.

Can TruFit be fitted in the rain?

TruFit is a pre-compressed self-adhesive foam tape applied to the frame before the window is fitted, so there is no wet sealant involved. It is not affected by rain, which means installation companies lose fewer days to adverse weather.

How much heat does TruFit save compared with traditional sealants?

Edgetech put TruFit into the test lab and it proved to retain more heat than traditional wet sealants — an average of 23% less heat loss than traditional installation methods. The perimeter of the window is the weakest point for heat loss in a standard installation, so sealing it properly minimises cold spots and draughts.

Is window installation tape an approved fitting method?

Yes. The revised BS 8213-4:2016 code of practice for the survey and installation of windows and external doorsets includes impregnated foam installation tapes alongside traditional wet sealant methods. Fenestration assessors from GQA Approved Centres have been trained in the theory and application of TruFit.

Do I need to scribe trim when fitting with TruFit?

No. TruFit expands to seal the spaces between the wall and the frame, following the contours of the aperture — so there is no need to scribe a bead section to match a particular contour. It gives a straight line even in uneven stone and brickwork, and there is no silicone colour matching or overspill to worry about on coloured frames.