This is my solution of getting a similar benefit to using spray foam insulation to finish a pole barn (heated shed/shop) that is cheaper, and you can do yourself.

See Part Two (What We Learned) HERE:    • Pole Barn Insulation (Or House) | PAR...  

You can buy all the products at your local lumber store.

Links:

Great Stuff Pro:
https://www.greatstuff.dupont.com/?ut...

Insulation foam board:
https://www.menards.com/main/building...

Tape:
https://www.menards.com/main/building...

Rock Wool Wall insulation:
https://www.rockwool.com/north-americ...