When you are laying down metal on top of a house, what are you doing? Or how about laying shingles down on top of a house? You are taking more time letting the sunbeam down on your sweaty back than you would be with putting foam roof insulation on the roof.
When you use metal for your room chances are the sun is beaming down on top of it which in terms makes it more hot in your house and even more harder to cool it down, this could make your electricity sky rocket in price. If you are considering saving money, in the long run you will be saving money with foam roof insulation because this will help your house from getting too hot.
Have you heard of or had the problem with a couple of months after a shingled roof was installed it starter leaking? With foam room insulation it can last a long time before it start leaking. Foam roof insulation has a long lifetime of about fifty years or more to it before you will have to replace it again. If your foam roof insulation does start to leak, then it will be easy for you to find the leak and fix it on your foam room insulation, because you will always see the water.
Foam roof insulation will take no time to install, all you do Is use a certain type of gun that heats up the former then you put it on your roof. If you have the time and money put on a foam room it is highly recommended because you will end up saving money in the long run, not just on the roof but on your monthly electric bill that you have to pay as well. When you do get a foam room insulation put onto your house you will not regret it.