Existing bay window - reduce cold bridging

23 Nov 2021
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United Kingdom
We have a UPVC bay window, which we'd ideally like to keep/improve rather than entirely replacing. We previously noticed some mould around some of the corner areas - we know that one of the panes of glass had a blown seal (which we will replace), so this was likely a contributing factor. However we want to ensure that the window frames themselves are well fitted, so as to avoid any additional cold bridging.

Is there anything retrospective that we can do to check for this/improve e.g. should the window frames be removed and refitted, ensuring any gaps are well sealed? Or is it a case that if we can't see any gaps, then aside from the blown seal on the glass, we shouldn't need to do much?
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A thermal survey on a nice cold day will help. If you don’t have access to a camera then an IR thermometer can do the same.

you don’t need to remove and refit. You should be able to get foam in to any gaps.

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