Of the various methods to insulate a shallow roof applying insulation to the exterior is easier than working in a space with limited access.
How to insulate a closed in porch roof.
The porch is on the second floor over the back hall and the pantry area of the kitchen.
Insulating ceiling of enclosed porch if you will heat the porch in the future then you should have a vapor barrier on the warm side if you are in cool location.
What s the best approach to insulating this.
It would go hand in hand with applying some sort of paneling to the interior side of the roof to hide the insulation and provide a bit more of a finished look.
Nail or staple the furring strips between the joists to hold the styrofoam in place.
The porch faces nw where most of the bad weather comes from.
If you re willing to invest some more consider an insulated porch roof.
Five ways to insulate an unvented low slope roof.
These are more difficult to deal with because you need a venting space between the top layer of the insulation and the underside of the sheathing of the roof.
Some warm areas do not require vapor barriers.
A pair of ceiling fans is also being considered.
The foil will reflect the heat from the roof and the foam will keep any cool air down you will also be able to keep the airspace which is absolutely essential with the steel roofing.
Large foam insulation sheets can be nailed directly against the floor above or held in place by chicken wire or other metal elements with the facing against the underfloor.
The insulation should fit snugly to prevent air from getting through.
If you re willing to invest some more consider an insulated porch roof.
Thats why people use the ceramic deck screws.
Ya the new pressure treated wood they took out arsnic and added more copper will eat through any metal.
Whatever method is used the amounts of insulation must achieve r values mandated by local codes.
If it is above grade winter drafts will make the room too cold to use no matter how well the walls and ceiling are insulated.
The insulation should fit snugly to prevent air from getting through.
When you convert a porch into a sunroom you ll get the most usage from the new room if you ve taken steps to insulate properly and a good place to start is the floor.
We had the original porch demolished down to the floor joists including its original almost flat roof and knee walls.
But for insulation i would tack up some 1 foil faced rigid foam sheeting and then cover it with wafer board or plywood which you could paint or whatever.