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<body>On Fri, 12 Dec 2014 10:36:41 -0500, AA-man wrote:<br><br><blockquote style="margin: 0 0 0.80ex; border-left: #0000FF 2px solid; padding-left: 1ex"><div dir="ltr"><div class="gmail_extra"><div><div><div>A current project is the gut rehab of a modest '40's house, with walls made of stuccoed concrete block.</div><div><br></div><div>Current thinking is to fasten treated 2x's directly to the masonry, with 1 1/2" thick Roxul Comfort Board installed between members. </div></div></div></div></div></blockquote><div><br></div><blockquote style="margin: 0 0 0.80ex; border-left: #0000FF 2px solid; padding-left: 1ex"><div dir="ltr"><div class="gmail_extra"><div><div><div> cover that with a continuous layer of more RCB, a good breathable WRB, furring, and back vented siding. </div></div></div></div></div></blockquote><div><br></div><div>As my Newfie fisherman friend might say :</div><div><br></div><div> "Oither ye tinks beeg or ye goes home, By."</div><div><br></div><div>Seems like a lot of trouble just to get 3 inches of insulation.</div><div><br></div><div>I'd be inclined to take those same 2x's, rotate/flip them 90 degrees and suspend them 12 inches or so away from the CMU wall, fill the cavity with multiple layers of Roxul batts, joints staggered/overlapping between layers -- R-40-plus with no foamed plast-ecchhh! (and attendant long fasteners so pricey that you feel that a pimp would be appropriate in the transaction).</div><div><br></div><div>Air-seal/WRB at the exterior surface of the block first of course, rainscreen cladding hung from the 2x's and lard tunderin jayzuz, oi tinks yer dun.</div><div><br></div><br><div id="M2Signature"><div>-- </div><div>=== * ===<br>Rob Tom ADT1 <br>Kanata, Ontario, Canada</div></div></body></html>