By Reggie Bullard
over concrete and foam insulation.
This seems lke a good method, although I haven't tried it,
This is the brand of fastener we are using. I talked with the
guy at Walrus
There is data on foam over masonry in a couple of the articles
Paul Fisette is a really sharp fellow. Used to moderate the building
forum at Journal of Light Construction.
What we are doing is attaching both foam and stucco wire (self furring, no paper backer) with the plastic anchors. I figured out that attaching the foam with the fasteners and then wiring the stucco wire to the fasteners was going to cause the wire to be too loose and too far away from the surface of the foam. The attachment schedule is 24" horizontal and 18" vertical with use of adhesive. That would switch to 12" vertical without adhesive.
As an aside, there are a lot of adobe and rammed earth homes built in the southwest. Many of them have exterior insulation board with stucco over. Most of these buildings have the foam nailed on with double dip hot galvenized nails (thin shank types are better).
I originally came across the concept of exterior insulation in
passive solar books then cross referenced it to adobe/rammed earth (we
built a passive solar adobe shop before we started the house).