Can you insulate under a porch floor
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If you can get underneath therefore e, I would try mounting some R35 Pink insulation boards.
Under and over. Have or can you insulate the ceiling???, Do you have access under it, then yes you can insulate. You have not said where you live, so the R value of either would depend on where you live.
There is spray foam insulation, but I believe it is a professional install and somewhat costly. If your floor joist are 16 inches on center you can easily install bat insulation, that is assuming you can get to the underside. If you go with bat insulation I suggest you put some nails in the underside of the joists and lace the insulation in place with wire. Or you can finish off the underside with vinyl soffit siding. If you buy insulation with a vapor barrier make sure that side goes toward the room.
Patio usually is a term used when hardscape is on the ground but porch usually is raised above ground level. If the porch is wood you can insulate from underneath but if it's concrete you can't. Heating installed before tiling would have been a nice solution.
You can try to have blown in insulation put into that location if it is low to the ground. If you can get underneath install the fiberglass insulation and then staple a 4-6 mil plastic to the floor joists over the insulation.
I think I would get some rigid foam insulation, I like the foil back kind, https://www.homedepot.com/p/Thermasheath-Rmax-Thermasheath-3-2-in-x-4-ft-x-8-ft-R-13-1-Polyisocyanurate-Rigid-Foam-Insulation-Board-613010/100573703?MERCH=REC-_-SearchPLPHorizontal1_rr-_-NA-_-100573703-_-N cut an put between the joists. You may need to dig an opening at the end where the joists end, so you can slide the insulation pieces in after measuring and cutting so they are firmly stuck in.
https://www.youtube.com/watch?v=kWekxHB_C6A
Then I would get some rigid wire screen the height of the opening plus 3-4", and the length all the way around, and a couple inches extra to fasten to the foundation. Dig down about 3-4" next to the porch and insert your wire into the ground as you roll out along porch footing and stapling to footing... https://www.homedepot.com/s/fencing%20wire%20staples?NCNI-5 and back fill the trench as you go. Remember to leave a flange at each end to fasten to the foundation.
https://www.homedepot.com/p/Everbilt-4-ft-x-50-ft-14-Gauge-Welded-Wire-308302EB/205960856
You can insulate underneath, it sounds. Talk to a contractor or handyman to see which they think would be better, keeping in mind they may say regular insulation so they get the work, but spray might be easier, if a company will take that small a job. By laid insulation, do you mean heavy plastic sheeting on the ground or insulation placed up against the wooden porch? Consider if enclosing the under area with brick, stone or something solid would help or not with the temp while also keeping the cats out. Nothing worse than a cold room. Are you up for lots of area rugs or w-t-w carpet?
Please look into encapsulating the area under your sunroom. That is the best for insulating.