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maj0819 03-25-2013 09:08 PM

Insulating 4 Season Deck Floor
I am enclosing my deck to make a 4 season room, approx. 10x16. I live in Rhode Island so have a cold winter. My deck is only about 2 feet off the ground which is going to make it difficult to get under.

I have read people using fiberglass and foam insulation but I already have 1" Dow Rigid Foam insultion. What is the best way to apply this? Is the best way to cut sheets and insert between the joists and then fill in cracks with spray foam? Can I just nail the foam across the joists? No sure about that since I would have space between foam and floor. Do I need to apply anything else?

Last option I just read... can I apply on top of my current deck boards and then nail the plywood for my floor on top of that?

Any advice would be greatly appreciated.

Gary in WA 03-25-2013 10:22 PM

One way, fig.7;


Windows on Wash 03-26-2013 07:28 AM

Pictures will be of a big help in this case.

I think you are better suited to get under the deck (if possible) and thermally uncouple the whole structure at that point.

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