||08-08-2010 10:24 PM
Furring out a 2x4 wall to a 2x6 wall
We live in Wisconsin and are remodeling a home built in the 1950's. As a result of removing a load bearing wall we are furring out our initial 2x4 walls to 2x6 to accommodate the supporting posts and to increase the insulation in the walls (which was only 1 1/2" thick) to receive 6" fiberglass (which we purchased a few years ago on sale). As a result of our investigation (and insight gained on this website) we have realized one of the drawbacks is the Thermal Bridging of the studs. I have looked at the options on the building science web site site and have developed an alternative solution to reduce the Thermal Bridging while still being able to use our existing materials at hand.
I have provided an attachment to illustrate the concept which is basically using a modified offset approach with a polyiso layer between the existing framing and the furring strip. I know it looks like a lot of work but it makes the best sense to me in terms of using what I already have on hand while reducing the thermal bridging.
Does anyone else have any suggestions as to how I can reduce the thermal bridging, or if this approach would/or would not fly with existing codes?