[Pantera]

On a house where you use wood framing and a plywood deck for the roof it is great.

BUT: On a metal building I have seen it happen too many times that the tempature difference between the inside and outside is too great. the inside will sweat and condense on the underside of the metal. It will cause the insulation to delaminate from the metal as it gets older and fall off in big chunks.

Seriously guys, I have seen it happen with my own eyes. It is not a thing you want to happen. Kind of like my skylights in the roof of my building. Dam things will drip when the temp difference is too great.

One of my good friends built a flat top raised seam roof on his 6,000 sf building with Tilt up concrete walls. After it was finished the supended celling was ruined by water leaks that they could never seem to find.
Two years later they finally went back to the manfacturer and raised hell with them thinking the roof was leaking through the seams somehow. The rep took one look and told them the problem was that they didn't put insulation in when the roof was installed and they would not do anything about it. The installer was forced to put all new metal on the building with insulation. It was his very first job of that kind that he had ever done. Needless to say, he was upset that the manfacturer failed to tell them that it had to be insulated when you put the steel down before the seams were sealed with the machine. They just sold him the metal and he installed it. No more leaks since the new roof was installed.

Be sure to ask some one that has a building what they would not do if they ever built one again? what they would do and not do and I bet you will get the same answer.


Just think about this! One little leak and you will have foam on the cars under them. When you use fiberglass with plastic underliner if you get a leak it will dry out and not bunch up. I have had a minor leak near a heater vent outlet and it didn't hurt a thing on the underside of the celling.

I will also point out that the white plastic liner on the underside of the roll type ceiling insulation reflects light much better than the yellowish color of the foam. Your building will also stay cleaner too. I feel it will actually look better inside too. IMO.

Do your homework and I hope you come to the same conclusion.

Pantera