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Discussion Starter #1
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

20200625_174559#1.jpg

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.

20200625_174612.jpg

What do I do to insulate between the joist?

Should i spray foam insulation like this ??

The flooring currently looks like this:
20200626_145128.jpg
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
 

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Discussion Starter #3 (Edited)
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.
 

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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.
 

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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.
 
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