• 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?

  • 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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