Opinions needed please....
I am doing a new build...I have a 30x40 attached garage (only 13' of shared wall with the house though) with a 30x40 full story above it, to be used as a workshop. Garage will be insulated with fiberglass in the walls....I believe he is doing R-13, but potentially could be R-19. I'll have to ask.
My plan is to install a minisplit in the workshop area. The actual garage area will be unheated - I'll just use a space heater or something when needed. For the workshop, I just want to keep the humidity out in the summer and drop the temp a little, and keep it at 55-60 in there in the winter. Basically, to make it tolerable to be in there.
I don't ever expect to finish the workshop space for liveable area, but I always liked that I have 1200 sq ft available as an option in case I need it for elderly parents, kids that move back in someday (they are 4 and 7 now), etc.
Builder normally puts in R-19 in a garage ceiling, so that is included in my base price. He can put R-30 fiberglass in the garage ceiling (so, between the garage and workshop) for ~$300 as an upcharge. That is a no-brainer. I will at least do that.
The house is actually being spray foamed, and I can have them spray foam the space to R-30 (again, garage ceiling/workshop floor joists area) for $3500.
I completely understand the cost - it's a big area. That being said, it's a lot of cost. Do you feel that in the floor of the workshop, R-30 fiberglass would do just fine, or would you cough up the $3500 to have it foamed. Is it really worth it?
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