Hi all, Looking for advise. Renovating my house finally, 1919 owner built (likely)- not a square cut stud to be found, no beams or headers to speak of and baloon framed of a sort. My prob is insulating for south cent Ontario nr. lake Ontario, walls framed w. real 2″x4″ stock – how to insulate a 4″ cavity. This is an ongoing process so I dont like all the prep to rent and blow1 or 2 walls at a time, took some bad advise from an ‘old school’ builder who swears on 3/4″ styro on outside and 3-51/2″ batt. He’s not using vapour barriers.
Do I bite the expense and fill w. rigid XPS for r20 or close my ears to wifes concern over floor space and furr out to 5-1/2″ cavity for as this will plumb the walls for r21.5 Roxul. Also 3/4″ strapping will compress some areas of wall,4-7/8″ at floor but nr roof (of this room) cavity will aproach 5-1/2″ cavity after plumbing wall. It’s a shame to piecemeal my own place but I/we have to live in ‘finished’ rooms
Replies
do a search on " mooney wall".. might be just the ticket
Like Mike said, the mooney wall is a good system. fiberglass+foam is ok too, but I think you're in a heating environment (you don't use AC as much as heat, right?) so the foam, being at least a partial vapor barrier, belongs on the inside of the wall, not the outside.
Cellulose blown in behind 1" EPS might be a good solution.
zak
"so it goes"
Like your idea of furring out and using the Roxul batts. Be sure to have an airtight inner wall surface like airtight drywall or install an airtight vapour barrier. Can't change the outside now but you can work on the inside
Edited 5/14/2006 9:52 pm ET by experienced