10:28AM | 08/29/06
Member Since: 08/28/06
1 lifetime posts
I have a 3 season porch with the floor about 3 ft off the ground that I want to make into a 4 season room. I have put 3inch styrofoam between the floor joists, and filled any gaps with foam insulation (from a spray can). Do you think this will give adequate insulation for the floor in South Dakota? Or is there something more I should do?


09:09AM | 09/10/06
Member Since: 11/06/02
1280 lifetime posts
Another layer of insulation spanning across the face ( bottom) of the joists, and build a skirt around that 3' elevation and close that in with a panel so wind doesn't blow through.

What's your climate and soil conditions?

Excellence is its own reward!


11:20AM | 05/31/16
Purchased home on lake in northern wisconsin. A room addition had been made, enclosing an existing deck which was only about 12" above the dirt. On the addition floor, carpet covered over plywood underlay and only a plastic sheet barrier was between that and the deck boards. How can we insulate this area to warm the room? There is central HVAC. It has been suggested by various contractors/handy people that we do everything from convert back to a deck or porch, to insulating under the floor by removing deck boards and "boxing" in between floor joists to contain some form of insulation. Deck boards are more or less even with original house floor. We prefer not to convert back to a deck. What can we do?
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