Posted By biggreen on 22 Feb 2010 09:15 AM
Posted By Dana1 on 19 Feb 2010 10:10 AM
if you're lucky it'll be just one 600board-foot DIY foam kit (at $700, by the time you've added in shipping and extra nozzle tips, etc.)
I need about 3200 board feet, How can I get lucky and only need one 600board/foot kit? But, I'm getting tired of piecing it all together so I may foam most of it even with the additional cost.
edit: I think I know what you mean about needing one kit. If you mean using 1 kit just for filling and sealing I won't need that much at all. The way I've been squeezing it all together there are almost no seams to fill, the edges are tight.
Yup, I meant, to seal up your cobbled up foam board sufficiently to retain good performance, you'd lucky to only need a single 600bd.ft. kit, an expense you hadn't included in your estimate for doing it piecemeal with XPS. Even if the cobble-job LOOKS tight at the cut seams butted up, unless it's been sealed with foam, mastic, or tape it'll leak air. Maybe you'll only need 100 board feet, but I'm sure it'll be way more than a case of Great Stuff to truly seal it.
Before you apply the finish wall pressurize/depressurize the house with a blower door or powerful window fan, go around with a can o' foam and seal up as many leaks as you can find. (You'll probably be surprized at how much leakage there actually is.)