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The silver stuff? I expect the glue will fail in the short term and it’ll all peel away eventually. If I was closing something up permanently under plasterboard etc I’d want to know it’s gonna be fine for 20+ years.
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Do not do this. As others have said, the adhesive will quickly fail.
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Builder has suggested using ventilation tape (which is literally a fraction of the cost) instead of formal airtightness tape.
Why? What savings are we taking about, it can't be that much in comparison to what you're spending on windows?
I wouldn't do it, that's not the place to be skimping imo.
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Boxes of Dupont acrylic airtight tape can be found on eBay for ~£100, so £10-£15 each.
As others have said, ventilation tape isn't up to the job...
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JonoMarshall
@gillies
Builder has suggested using ventilation tape (which is literally a fraction of the cost) instead of formal airtightness tape.
Hard to argue with logic that it would work fine given it's design to make ventilation systems airtight...
Is it a bad idea?