Insulating an Old Colonial House
I recently purchased a 5000SF colonial outside of Boston and would like to insulate the exterior walls and underside of the roof/attic from the interior. I’m completely tearing out all of the existing lathe and plaster. The exterior of the house is wood clapboard and tar paper house wrap over board sheathing. The wood all is in great shape and I haven’t seen any evidence of water infiltration up to this point, but there is still more demo to be done.
The windows are all original single pane windows with storms. I plan to leave the windows.
My main question is how to properly insulate the house. I’ve read a lot of the posts on here and the need for an air gap but they seemed to be mostly describing homes with no sheathing. Is that type of detail advisable in my situation as well? Can I just use mineral wool batts?
For any cathedral type ceilings I’m planning on using open cell spray foam.
Any attic spaces I plan to use mineral wool or blown in cellulose depending on the situation.
Your help is greatly appreciated!
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