Stop a Balloon Frame House From Swaying
I am currently in the framing phase of a deep energy retrofit gut rehab of 3 story 1880s balloon framed home in zone 5 (Chicago). I have basically spec’ed a platform framed house to be built within the existing balloon frame with the idea that we would be able to add insulation and it would give addition strength to the building.
This past week as been a windy one here and my framing contractors informed me that the house is swaying more than they are comfortable with even after the interior shear walls were added. They are recommending 2 inches of closed cell spray foam for the exterior walls to add rigidity and strength. The existing plans call for the following wall construction
8 inch cellulose
original clapboard sheathing
3 inches of Neopor GPS foam
My fear is that adding the closed cell foam to the inside that the walls they won’t be able to dry (from my understanding GPS has more drying potential than EPS but it is pushing the limit at 3 inches). Does anyone have have recommendations on stopping the swaying other than closed cell foam, or does anyone think that the walls will be able to dry effectively even with that closed cell on the inside?