Wouldn’t your insulation effectively work like Swiss cheese?
Edit: while I have your attention, would you bother insulating a detached building that is NOT temperature controlled 24/7 like a house? It’s a hobby workshop. My thought process is that the insulation would only be paying it self off in the winter + while I’m in it + after whatever amount of energy I would have spent heating it WITH insulation. To me it just seems like the break even would be sooo far in the future…
Edit Edit: I’m not so concerned about the summer. I have a couple ceiling fans and a few attic/gable fans that help dissipate heat.
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It still raises the value of the wall
The stud provides a relatively narrow conduction path through the wall, only about 9.5% of the area of the wall is studs (1.5″ stud 16″ on center) which still leaves 90.5% of the wall that you can adjust the heat loss through
If 10% of your wall has an R value of 4 from the studs but the remaining portion is 15 from the fiber glass insulation then the overall wall ends up with an R value of almost 12. If you only use poor insulation with an R value of 6 then the wall end up closer to 6 losing twice as much heat to the outside.
For a practical example. If your garage door when closed has gaps around it, is it even worth closing it to keep the garage warmer? Absolutely! Because while the gaps have terrible insulation you can still fix the vast majority of the issue by having the door shut (aka insulating the rest of the wall)
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