If you feel any breeze coming in anywhere you should stick rolled insulation fabric or foam into the openings.
Screened porch roof insulation.
They make the roof panels 3 to 6 inches thick not just at the edges where the fascia on a pan roof may be that tall but all across the panels.
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You have the choice of blown insulation or you can purchase rolls of insulation.
An insulated aluminum patio roof uses aluminum clad foam panels.
Roll out the fiberglass insulation sheets between the joists facing side up making sure it is snugly in place.
Polystyrene core insulated roof panels great for homes cottages rvs and trailers versatile high quality and ready to assemble aluminum patio cover kits for the handy diy homeowner interested in a clean professional looking finished product at a fraction of the cost from a contractor.
No other insulation type would be necessary in the rafter spaces as you mentioned would block airflow.
Choosing the r value you need will depend upon your geographical location.
A small porch can be covered for usually less than 970 00 a medium sized porch for about 1 495 and larger porches cost about 2 750.
Make sure the seals between the glass and the frames are all tight.
Cut styrofoam insulation to the correct size and layer it below the fiberglass already in place.
If you want some form of insulation in there you could install 1 1 2 foam board panels inbetween the rafter spaces keeping it down at the lower part of the rafters and keeping a 2 airspace between the roof sheathing and the foam board but dependent on your location imo you wouldn t need it.
A pan roof has a less finished look with the pan roof sections either corrugated or creased to add rigidity.
If your porch is screened the first step will be either to add glass all around or to replace the screen with standard glass panels.
Any local home improvement center can recommend the best type of insulation for your project.