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Bay pole problem

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21 Jul 2025
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Ireland
We have bay windows with metal bay poles joining the panes at about 120 degrees. The poles are a magnet for condensation. In winter, you can almost see the beads of water forming and running down the inside.
Has anyone ideas or experience to improve this? We are working on air flow and dehumidifying but something to directly address this (they also are big cold bridges in winter).
 

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Has anyone ideas or experience to improve this? We are working on air flow and dehumidifying but something to directly address this (they also are big cold bridges in winter).

All you can do, is find something with some insulating properties, to stick over the metalwork. See if you can spot anything on the https://www.eurocell.co.uk/ website, which might fit the bill, if siliconed into the gap.
 
Obviously it's because the metal surface is getting very cold via conduction from outside. If you covered the metal surface with a material that is an insulator (as said above), then the surface would be less cold and therefore less condensation. Something like a custom rubber moulding might work.
 
Shouldn't they have been made so that the frames met edge to edge with no gap.
 
Foam a D mould trim over the corner, maybe 50mm - buy from Eurocell, NON expanding foam from Eurocell (if they sell it) or Screwfix. Mask the frame as the foam is hard to clean off. You might need to silicone the edges of the trim (LMN from Eurocell) with a tiny bead.

Screenshot_20250722-075354~2.png
 
Foam a D mould trim over the corner, maybe 50mm - buy from Eurocell, NON expanding foam from Eurocell (if they sell it) or Screwfix. Mask the frame as the foam is hard to clean off. You might need to silicone the edges of the trim (LMN from Eurocell) with a tiny bead.
Thanks, think I will attempt this. For whatever reason the Eurocell website isn't working (could be just in Ireland), but will try Screwfix.
When you say to mask the frame, how would the non-expanding foam be inserted? Would it be that a small gap should be left at top of the D mould and by spraying the foam in between mould and bay pole that it will naturally sink to the bottom of the gap and fill from bottom to top?
 
No, the foam wil stick where you place it then stick the trim on top of it and press home down both sides. Any excess will squeeze out hence the need for plenty of masking tape and plastic gloves when you do it. Trim any excess off once it has dried.
 
I wouldn't use foam, if you get a roll of glazing tape say 3 or 4mm thick, that will enable you to stick the PVC trim and will also offer some form of thermal insulation as it's basically sticky foam.
 

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