Insulating A Metal Porch Roof

Lay the plywood perpendicular to the roof joists and fasten it in place using galvanized or stainless steel roofing nails.

Insulating a metal porch roof.

Metal roof insulation increases the temperature of the inside surface of the ceiling. 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. The best material for use with metal roof insulation is in the form of foam batting. 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.

This is different from the normal roll up type of insulation as it comes in panels rather than paper covered fiberglass. Thats why people use the ceramic deck screws. The insulation should fit snugly to prevent air from getting through. If you re willing to invest some more consider an insulated porch roof.

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. This foam can be used on either the outside or the inside of the sheathing. Ya the new pressure treated wood they took out arsnic and added more copper will eat through any metal. Condensation can cause your ceiling to rot.

The batts are located side to side on the rafter of the roof. This in turn prevents moisture condensation on the metal roof. Fiberglass batts or glass mineral wool metal roof insulation the most common material used for an insulating metal roof is fiberglass batts or glass mineral wool.