• 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?

  • 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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