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insulating a cinderblock ranch house

joekuhl's picture

I’m remodeling my kitchen by tearing down two walls and converting an existing outside door and window in the kitchen to a big window above the sink. My plan is to also add 4” of foam to the outside all around the house and leave the inside walls untouched. I need new windows anyway and my big picture window in the dining room will become a patio door. So I’m already planning to change the outside siding. The interior of the cinderblock walls have  2” by 2” sleepers on the inside of the house against cinderblock that the plaster board  is connected to. I’m not going to insulate the inside because my assumption is that  it needs to dry to the inside since there is foam on the exterior. But inside the wall cavity of those sleepers there is an air space that leads to the attic/soffit that could be an air sealing issue. Should I leave the gap and let air move from the wall cavity to the attic or should I foam the top of the wall from the attic to stop air flow. 

Where is this structure (post #215874, reply #1 of 3)

Where is this structure located?


Of all the preposterous assumptions of humanity over humanity, nothing exceeds most of the criticisms made on the habits of the poor by the well-housed, well-warmed, and well-fed.  --Herman Melville

St. Louis missouri (post #215874, reply #2 of 3)

St. Louis missouri

Seal it up. (post #215874, reply #3 of 3)

Given the level of humidity in St. Louis, I think you want to seal the interior as tight as you can. Any opening will allow that muggy air inside. 

While out driving with some friends some years ago, we passed a iluminated bank sign with temp and time. I asked, "what do you call it when its 100* at midnight in St. Louis?". 

"Routine", was the answered I recieved. 

Good luck.