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I assume this is taping to brick? If so, your plan sounds good, although you'd need to PVA the brick prior to taping (let it dry properly) as otherwise the tape will be ineffective due to dust. The PVA/tape would still be your weakpoint (adhesion to brick). I did some tests with the PVA/tape combo on bricks and it's great for being difficult to peel, but eventually you can 'unstick' the whole thing if you keep attacking it enough.
An architect friend did mention some sort of Passivehaus putty/slime that was being developed for better retrofits, essentially a better airtight foam but I can't remember what it's called. There are also roll/paint on airtight membranes (glues) that you could use instead of the tape, but I expect it'd cost £50+ for a tin instead of £5 for some tape/PVA.
JonoMarshall-
There's a special masonry primer for airtightness tape: Tescon Sprimer https://www.ecologicalbuildingsystems.com/product/tescon-sprimer
I've used it in loads of places around our house, sticks like shit, loads better than PVA/SBR/whatever.
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Thanks - should have mentioned I'll be using primer as Ecto says.
ectoplasmosis
gillies
another airtightness question
I am putting a DMEV fan in my kitchen - the builders will core a hole. What materials should i use to ensure air is only coming in when the fan is on?
I was planning on using illbruck airtight flexible foam around the unit when installed and then airtightness tape with a fuzzy backing (that can be plastered over) around the unit edge.