Is Spray Polyurethane Foam prudent in this application?
I am renovating a 115 year old building in Denver, Colorado. The structure is triple-wythe solid-bonded very soft masonry. (See the attached photo.) I’d like to apply Spray Polyurethane Foam on the interior side of the wall and then overframe and drywall. (I can’t do anything to the exterior because the facade is landmarked.) I have two concerns:
1) That moisture which enters the wall from the exterior will not be able to get out and could cause laminar separation of the masonry due to the freeze-thaw cycle.
2) That over time the masonry will spall and therefore debond the Spray Polyurethane Foam.
Are these valid concerns? Are there any applicable case studies? Are there alternative foam products that would work better?
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