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...
@JonoMarshall started
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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?