Thermal Break Between Garage and House Foundation?
CZ6A, Ottawa ON
So I’ve been Googling and finding nothing.
I have a pretty standard foundation design for a two story with attached garage. I’m planning to do a capillary break between footings and foundation walls, exterior membrane and dimple mat, exterior above grade insulation, all the usual tricks to keep the basement warm and dry.
With an attached garage foundation as well as a poured front porch extension, both of which connect to the house foundation, how do I keep heat in and moisture out where the garage and porch meet the house foundation? I guess I could treat those parts of the foundation the same way as the house section, but that’s a lot of work and expense.
Is there a way to thermally and hygroscopically separate the two? I was wondering if separating the two sections with high density foam and having multiple penetrations of rebar would work? This would still transfer some heat but would hopefully keep the water from migrating while allowing a structural connection.
Thoughts? Has anyone seen something like this tried before?
There are also high density thermal breaks designed for steel member attachments in commercial buildings. If foam is a terrible idea, perhaps something like that could work?