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Optimal Insulation for Four Inch Walls
Before I request your humble help, I just wanted to thank everyone on these boards for taking the time and contributing. You've helped me tremendously! (As a web designer / developer, holler if you have any questions on that frontier)
Now then... I purchased a "fixer upper", an 1893 colonial in Boston burbs with four inch studs in the walls (forgive me for this is "greek" to me). I have a limited budget to do all the works and wanted to know what is the most optimal insulation for this New England region home. My budget is limited so I am not sure if I can afford spray or blown in insulation.
Can I make an insulation "composite" that is perhaps some type of a styrofoam + batt (1 inch styrofoam + 3 inch batt?)? Would that yield a higher R value?
Is it possible to nail an additional 1-2 inches of wood to all the studs? So you nail 2 inches to a 4 inch board, giving you six inches and allowing you to put that much more insulation? Is this possible? Done before? Effective?
I realize that I can also nail a styrofoam insulation outside before the siding goes on, but in case we cannot afford new siding, I am trying to see what can be done to the structure.
I will also heavily focus on having a highly efficient heating system + well insulated "tubing" for the thermal distribution.
Cheers and Thanks.