My opinion. Use a minimum 5/8" osb with the foil on it. And use the clips between the sheets. I wish I would have.
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I am going to lend some (I hope) helpful advice.
After struggling with my 60k BTU heater for some time, here is what I have found:
1: :shocking: It is a good Idea to buy a low pressure gauge and attach it permanently to the port on the left in the back. a 0-15 psi is fine. It is a great tool...