In addition to walls and attics insulation should be installed in ceilings with unheated spaces basement walls floors above vented crawl spaces cathedral ceilings floors over unheated garages or porches knee walls and in between interior walls especially bathrooms as well as ceilings and floors.
Insulating attic and porch.
If you can crawl under your porch insulate from below by nailing plywood boards to cover any openings.
Probably in more place than you think.
Insulating attic floors unfinished or uninsulated attics need a layer of protection against air migration.
The purpose of insulation is not to keep the attic warm but to keep the house warm or cool.
Install batting between the attic s floor joists.
Is the porch heated.
Plan to pull up the flooring and layer new insulation on top of the old.
The insulation should fit snugly to prevent air from getting through.
You actually want the attic to stay relatively close to the outside temperature to prevent ice problems in the winter or overheating in the summer.
Not sure where exactly to insulate.
The important thing is that the ceiling above your living space is insulated because that s the area you heat cool.
The batting material must be faced and.
If not then don t bother.
Your porch being open on one side doesn t really need to be insulated at all.
It was probably done as a courtesy in case you wanted to fully enclose it in the future.