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The Visconn is the air control layer; the Intello can be an additional air control layer but it's primarily the vapor control layer. (NOT a vapor barrier; it simply slows the flow of water vapor so the rest of the assembly can deal with it.) With convoluted joist bays it can be hard to get the Intello fully sealed to the framing to the point that it is an air barrier.
You need at least one air control layer and one vapor control layer. I avoid foam whenever possible and the 475 approach will work, but it's a lot more work than simply spray-foaming the rim joist, which does everything you need in one shot.
kieran937,
475 have given you advice that takes into account both air-sealing and the need for an interior vapour-retarder. You could try and combine the two functions inside the batts, but to do so effectively may be more work than doing what 475 suggested.
When it is just acting as a vapour-retarder the Intello-plus doesn't need to be installed particularly well, but if it is to be an effective air-barrier it will need some backing at the perimeter of each joist bay so you can run a bead of sealant to bed it in and then staple.
Those to me seem like your two options. Maybe someone else will come along with an easier one.
OK, thanks a lot. So it sounds like if I do a thorough job air-sealing with the Visconn, then just doing an acceptable job securing the Intello would be OK. The Visconn can be painted on or sprayed on. The sprayer is $500 - any significant advantage to spraying it as opposed to painting it?
kieran973,
The only advantage I can see to spraying would be speed.