Building a new house, looking for opinion on insulation/exterior foam combinations
I am currently in the process of designing a new home. I built one four years ago that we have decided is too big and inefficient for what we need. This time around I am looking to build small, simple and efficient. The house will most likely be framed with 2×6 walls, however I would like to maximize R value of that wall.
The house will be a 28 x 36 cape style home. no bump-outs or dormers. There will be 3′ knee walls around the exterior of the second story to allow for more living space upstairs (to fit 3 bedrooms and a bathroom comfortably). There will be zip system for exterior sheathing.
I am looking for opinions on how you would choose to insulate these walls efficiently while on a budget, Would you use roxul? (and if so would you need any type of barrier or would the zip system and the painted drywall be sufficient enough for moisture control?) I haven’t checked the cost of blown insulation in the walls yet but I know this can be a favorable option.
On the exterior I was considering installing a rigid foam for the thermal break however I am wondering how you guys typically handle this at the point of the windows and doors. What are you doing to pad out the windows? If for example there is 1″ foam are you ripping 1″ wood material and just being okay with not having the insulation factor of the foam behind the nail flanges? It seems as though this would cause an issue of not being able to properly flash your windows to the sheathing as well as not having tyvek to put your top piece of flashing tape underneath. And then as far as siding would you recommend longer fasteners or would you use furring strips? We are between using clapboard or vertical siding at the moment.
Thank you for your help.
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