I'm preparing to replace T-111 siding on my unheated detached garage with vertical cedar shiplap siding to match our house. I'm pretty sure the siding on the house (now 35 years old and showing it) is unpainted on the back, but a contractor who recently replaced some of the siding while replacing windows primed the back side (as well as the front). Should I do the same on the garage install?
Would the answer be any different for any future siding replaced on the house?