jayc89 Posted April 17, 2023 Share Posted April 17, 2023 Will be replacing 13 windows over the next couple of weeks and I'll have a 10mm gap to seal around each one. Tremco Compriband seems crazy expensive for the amount I need. I've seen a few other "expanding foam tapes" popping up recently, has anyone used any alternatives? Were they as good as Compriband? Link to comment Share on other sites More sharing options...
Gone West Posted April 17, 2023 Share Posted April 17, 2023 Compriband is UV stable which may be or not important in some applications. I have used an alternative which worked for me with sealing windows but I don't know if it was the only sealing layer it would work very long term. https://www.affixit.co.uk/expanding-foam-tape-compriband-alternative.html 1 Link to comment Share on other sites More sharing options...
jayc89 Posted April 17, 2023 Author Share Posted April 17, 2023 22 minutes ago, Gone West said: Compriband is UV stable which may be or not important in some applications. I have used an alternative which worked for me with sealing windows but I don't know if it was the only sealing layer it would work very long term. https://www.affixit.co.uk/expanding-foam-tape-compriband-alternative.html Thanks. This would just be the external seal, I'd still have FM330 as the intermediate seal and tape joining my VCL as the internal seal. Link to comment Share on other sites More sharing options...
jayc89 Posted April 17, 2023 Author Share Posted April 17, 2023 And what thickness of tape would you recommend for external window sealing? Link to comment Share on other sites More sharing options...
Redbeard Posted April 17, 2023 Share Posted April 17, 2023 (edited) How long is a piece of ....tape? Openings are not always perfectly x mm bigger than the frame, so just something within the working range of the chosen tape. Remember that there's an air-tight expansion range, and then there's 'what the tape will expand to', and the two are very different. IIRC there's generally only about 3-4mm in the expansion range. (I have '3-6' and '6 - 10', for example). Ah, did you mean width, not depth? If the former I am not convinced it matters too much. Edited April 17, 2023 by Redbeard Width vs depth Q Link to comment Share on other sites More sharing options...
jayc89 Posted April 17, 2023 Author Share Posted April 17, 2023 3 minutes ago, Redbeard said: How long is a piece of ....tape? Openings are not always perfectly x mm bigger than the frame, so just something within the working range of the chosen tape. Remember that there's an air-tight expansion range, and then there's 'what the tape will expand to', and the two are very different. IIRC there's generally only about 3-4mm in the expansion range. (I have '3-6' and '6 - 10', for example). Ah, did you mean width, not depth? If the former I am not convinced it matters too much. Yeah, width. Given I'd be getting 6-15mm tape (or 8-15mm if using Tremco). I'm thinking 15mm wide should be enough? Link to comment Share on other sites More sharing options...
Redbeard Posted April 17, 2023 Share Posted April 17, 2023 Can't really see any reason for going wider than that, particularly since (if I read you correctly) you are backing up with FM330. 1 Link to comment Share on other sites More sharing options...
Gone West Posted April 17, 2023 Share Posted April 17, 2023 7 hours ago, jayc89 said: And what thickness of tape would you recommend for external window sealing? IIRC the tape I used was 20mm wide. To ensure the seal is watertight, the gap to be filled, should be within the expansion range of the tape. 1 Link to comment Share on other sites More sharing options...
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