Do I need a sacrificial parge if I spray foam a rubble/brick foundation?
In one paper, Lstiburek, says that you should have an external sacrificial parge if you reduce internal drying of an old masonry foundation.
In another paper, Lstiburek suggests that spray foaming field stone basements is essentially the best thing since sliced bread, but makes no mention of needing an exterior sacrificial parge.
I want to spray foam my foundation. I can’t do a sacrificial parge for appearance reasons. The building is 200 years old, and I don’t want to compromise its structure. Am I inviting structural trouble if I spray foam and can’t parge the exterior? Is there any real data on the long term consequences?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part