Hybrid insulation: rockwool + foam board (and canned foam for airtightness and extra R-value)
This my first home, very hand have done remodels and stuff before. I wanted to use spray foam but it is out of the question cost wise. I have a 1900 house with plaster. I will be going room by room removing plaster to wire, insulate, drywall and replace windows. I have not found a lot of info on making a home air tight yet. So here is 2 plans not sure how they work work out:
Note 1 The plaster wall should give me 4-4.5 inch of stud bay depth.
Note 2 will be pulling down vinyl siding to put up 1 inch r5 foam board outside, then hopefully reusing siding.
air tight stud bays some how caulking / can foam etc..?? not sure need to look this up.
put in r15 rockwool.
vapor retarder (not barrier)
cut foam board to stud bay size, can spray foam around it. The extra depth should allow for 0.5 to 1inch of foam board + rockwool insulation.
put in r15 rockwool
vapor retarder or not (not sure as the foam board could be a barrier)
My issues are with the dew point / moisture mold problems. Will this work if not, What is the best way to air tight the stud bays before the rockwool.
I will be trying to make house air tight, handle dew point issues, thermal bridging, and air quality. The wall and ceiling have to be fixed first.
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