I have been enjoying the questions and subsequent discussion in this form for quite some time. So far I have found the broad range of topics information very helpful.
One topic I haven’t been able to find a conversation on is sheathing-less construction. I realize that there are plenty of buildings that don’t use OSB or plywood sheathing and simply use Polyiso or XPS as sheathing/continuous insulation /air barrier/WRB over wood framed and wind braced walls. The builders I have seen using this method seem to be selecting this assembly primarily for the cost savings by not installing OSB or plywood and not for any sound building science reasons.
I’m located in mid-western Ontario and have been building for almost 30 years. During my career, I have always used OSB or plywood sheathing. However over the last couple years, my company has been moving in the direction of high performance and passive building which has led us down the path of super insulated walls and all of the good stuff that comes with this method of construction. So my question for this forum is……
With the advent of products like Solitex Mento Plus from Pro Clima which can be used in directly over the exterior of a stud wall to create a sheathing-less enclosure and is robust enough to accommodate dense pack cellulose or fibreglass, is “cold sheathing” still a concern for thick (double stud) walls? To me the idea of installing a skin like this on the exterior with a vented rain screen and using a smart vapour retarder on the interior of a dense packed double stud wall would create a very “dry-able” wall. I realize that OSB or plywood might be necessary at times as a structural requirement but in situations when let in wind bracing is suitable a sheathing-less wall seems to make sense. Also, nice and light to stand.
Ok enough blabbering from me, have at it! I welcome your feedback.
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