New Home efficiency options
I am building a new home just outside of Portland Oregon, home will be about 2,700-3,200 sq feet and we are finalizing plans this week.
I own an HVAC company in Portland so will be doing a variable capacity WaterFurnace 7 series ground source heat pump with ground source water heating for the home. Windows will probably be in the .25 U-Value range(so an R4). House will probably have 4KW solar system but that is undecided as of yet. I am not looking for fastest payback, but if after the additional cost of the insulation added to the mortgage saves as much as it adds its a no brainer to do since energy is only going up.
My biggest questions are about insulation since I don't have much experience beyond what my customers tell me about their home.
So far I am leaning towards damp/wet applied cellulose because of its air sealing properties and sound deadening and overall insulation value along with 2" rigid foam board on the outside taped at all seals.
Quotes are roughly $1.50-$2.00 per sq foot for this(not counting rigid board)
Other options would be a flash and batt, so 1" of spray foam then batts to fill the cavity with the same rigid foam outside.
Quotes for this are about $2.00 per sq foot(not counting rigid board)
Are there any other options I should consider? What would be the pros and cons of each of these insulations? Let me know if you need any additional information.