Well got the house sprayed to day. Seems every company has a diffent oppinon on what's the right way to do it, I called a lot of places talk to a few people and finally just did it. Hope it is good because it's there now. We will see if the invoice is the same as the bid they gave me.

Is that 6 inch in the walls?

How about 20 inches of loose fill in the attic for an R49 rate.

I have heard good things, building a shouse/metal building home by chance?

It's 2×6 walls with a 2×4 skirting, so the foam is about 4" think. I haven't decided on the loose fill. People say the foam is pretty good. I am putting a wood stove in too so I wonder how hot it will be in there.
Yes it's a metal house 30×50.

Getting ready to have my pole barn on my new property sprayed, it's going to be my fur shed in he future and I figured while I have the time and it is empty I will get it spray foamed and not have to clean it out again

My under standing is after a certain thickness (I don't recall the number) that more foam does not create any more benefit

I would say that depends on where you live.

We are using a LOT of foam insulation in the custom homes we build and it presents many advantages.

Cost difference is pretty big over batts, but I think that will come back pretty quickly in energy savings in most homes.

The rate is about R-7 per inch of closed cell (icynene) foam, so the OP's 4" represents about R-28.

R-49 would only require 7" of foam, whereas loose fiberglass batts would be 14" thick for R-49.

And how you heat. Tempering a pole barn, I could see a point of diminishing returns. Try to keep a big house at 70o is another story and more is usually better.

We had the open cell foam put in our house walss we built, so far the electric bill is about half the price of our old house that was half the size. I am a fan

Did you have the insulators run the wiring too? lol.

Good looking building though.

lol no I did the wiring, got the out side walls good enough for them to spray so now I will go back and straighten up the rest.

Read this http://insulationinstitute.org/wp-content/uploads/2016/02/RP067.pdf

There are limits to spray foam insulation

I know there is a big difference in the temp now after they sprayed, I can climb up in the attic now and not just pour sweat.

Sweet. You will love that! Congratulations.

I didn't check any prices for bat or blow in insulation so I won't miss the extra money I spent I guess. It's all open cell which is what that company does. Other companies would have did some close cell in the ceilings and then open cell the rest. I tried to research it all but there was so many diffent opinions. One guy build his house and put osb board all the way around to screw his metal too and to spray the foam to.

The house I bought I foamed the basement walls with the close cell foam and the ceiling and inside walls with the open cell foam. So far so good. Eventually I will do the upstairs and attic also with spray foam.
I did a 24x24 garage that is my fur shed floor to peak of roof with open cell and can keep it 80 degrees in the winter with an electric heater or a pellet stove set at the lowest setting will keep it about 75.

The reason they want the closed cell in the roof because it is water proof. The open cell under a roof will hold water like a sponge until it becomes over saturated and begins to drip. When you create a completely sealed home like the pic above you need to have a fresh air return along with a dehumidifier and a humidifier.

The a.c. guy said he was going to put fresh air return in.

You will love your heating and cooling bills! By doing that you can undersize your over all system size by one ton. Don't let your hvac guy get carried away with your fresh air intake all the out side air it sucks in you will have to pay to condition! A lot of people don't realize a well insulated house will mold during the summer with a larger ac versus a smaller one! the reason the large one will make your house like a cave cold and damp! smaller one will run longer dehumidifying it 100%. the seer of your ac unit will dictate your operating cost over any thing else! as long as you stay in prospective. That house would be a great candidate for a ground source heat pump! but they are very pricey! With a wood stove im betting you will be opening windows in the winter. Congrats on your new house