I am new to this forum, an owner builder in Minnesota. So far the house is roofed and sheathed with osb. We have decided to use hardi plank siding. They specify building wrap under it, which makes sense. The first part of our house (that we live in presently) I covered the osb with bufflo board (insulating sheathing I think it is called)…..great protection for the last couple years on that part. I am considering using buffalo board for the rest of the house instead of house wrap ( by crossing the joints) since per sq foot it is only costs 25 percent more than tyvek and it has some insulating quality. Also, I had a wind breaker of tyvek (an advertising thing they gave out)….wore it in cool weather and was so clammy I took it off in an hour and gave it away. Was pretty negative advertising for such a product. At least I know buffalo board breathes. Any advice? Thanks, Dale
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I'm putting Hardiplank on a house now too. Most of the house is EPS foam, but some is on regular framing. Over the foam we put nothing on. Half the rest we tyveked. The remainder is being nailed over roofing felt. I don't personally feel it makes a doggone bit of difference. Two of the three houses across the street in this sub are vinyl with no barrier over OSB. I think that is a big mistake but maybe under the hardie it wouldn't matter, m eaning doing it your way sure looks plenty well better than that, if that helps. Are you caulking your joints? I'm not even 100% sure that that matters. We're using small scraps of tarpaper under the joints, butting them up tight mostly. I don't think the caulk really matters--thinking of all the cedar claps put on the same way.
Good luck,
MD