Interior insulation with old solid brick walls
Thought this could be a lively discussion.
I recently ran across an item touting a way to insulate solid brick walls on the interior using a drainage mat on the interior, with spray foam and studs inboard of that, and drilling drainage holes thru the brick to the exterior. (See attachment.) As an architect practicing in climate zone 5 (NYS), I found it intriguing, yet I’m skeptical of its practicality and cost. We happen to have a ton of old brick warehouses, factories, etc. which are suddenly in demand for conversions to loft apartments, so getting this detail right is important. Currently we spec 1″ rigid XPS attached directly to the inside of brick wall, then 2×4 studs with kraft-faced batt, then GWB as air barrier. This satisfies the Energy Code and our clients’ budgets, but it probably doesn’t let the brick breathe well on the interior side.
How would you compare the two methods?
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