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?
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.
@Gewürzt 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?