Help with knee wall insulation project
Hello, I am looking for some help with an insulation project for a knee wall in my old Bungalow style home. I am in Michigan so the winters can be very cold and summers hot/humid. I am currently insulating the knee walls in the upstairs area where our bedroom is. The bedroom gets extremely hot in the summer due to the knee walls, but somehow stays relatively comfortable in the winter.
What was in there before was some old tar paper type insulation with a very thin layer of insulation sandwiched in the middle of the tar paper (looks like brown cellulose?). This was on the back of the knee walls, while the floor of the knee wall space is adequately covered with blown cellulose. I have taken out all of the old tar paper and replaced that with faced r-13 fiberglass (the walls are 2x4 studs) with paper facing the living space. I am now in the process of blocking the floor joist cavities under the knee wall with 1" foil faced foam board and air sealing with spray foam. I have air sealed all electrical outlets with spray foam as well.
My questions are:
Will the r-13 and air sealing make a difference? I know more R value is ideal but I am working with 2x4 studs, and the main limiting factor: BUDGET. I am in between jobs and simply could not afford anything thicker (I priced everything).
Will I need to add house wrap or some form of sheathing over the back of the insulation? Can this be done in the future as more funds become available?
Are there any other cheap additions to what I am doing to make the space more comfortable?
Like I said, budget is my main concern and I'm just looking to improve the comfort level at the moment. Any suggestions are greatly appreciated.
Posted Aug 3, 2014 12:08 AM ET
Edited Aug 3, 2014 7:23 AM ET
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