[bajinganindy2]

The title is a bit off. No one insulate porch I know. But that's the best way without going too long for a title.

I have this porch/balcony in my house

I'm trying to convert this into a room. I will have windows installed on the opening on the 2 sides and have HVAC vent redirect to this area.



The problem is: underneath the porch is currently not insulated. It is NOT part of my basement. It is OUTSIDE the house.

What do I do to insulate between the joist?

Should i spray foam insulation like this ??

The flooring currently looks like this:

Should I put some sort of insulation layer too before i put vinyl flooring? Any suggestion on what should I insulate with?

Would appreciate any other suggestions

 

[Nealtw]

So your basement is below this?

 

[bajinganindy2]

no it's not. right underneath this porch is just soil(ground).If you draw a straight line down from The wall where that sidings is on, that is the basement wall.

 

[Windows on Wash]

Where is the home? Easiest will be foil faced foam and some joist cavity fill.

 

[Old Thomas]

I insulated one like that from beneath by putting foil faced bubble insulation up against the floor to maintain a small barrier between the insulation and the floor. Then I filled the cavity with mineral wool batts. The final step was covering the bottom with plywood to keep critters from taking up residence in the insulation.
I considered spray foam, but the price was too high for what I wanted to do.

 

[Anglib56789#]

Id screw a 2 inch foam board between the joists, cut to size. then fiberglass rolls, then plywood or waferboard.

 

[ratherbefishing]

We installed a sun room on a deck. Ceramic tile floor on Wonderboard. Not much different from what you're doing. I put R-19 (?) pink fiberglass insulation between the joists, then nailed old fashioned blackboard sheathing to the bottom of the joists. The blackboard has sagged a bit in places. It's not real pretty. But no problems so far.