Urethane Foam
 

Anyone recommend someone to spray this stuff local ? pm if like .. need to get a high R value in a flat roof area . 6.6 per inch I believe .

Too far for me, but it should cost in the .85 to 1 per board foot range for 2# foam. Depends on quantitys, access, competition etc.

Pete ,.,, I've seen kits to do it yourself .. ???? any good ?

You can buy a froth pak, which is two part urethane foam. You need to wear a respirator, a really good one with the right cartridges. They work best for airsealing rather than trying to do the thermal insulation as foam. the material costs is typically equal to or a little more than having it done.
What is your assembly?
Example: asphalt shingle, plywood sheathing, 2x12 rafters, drywall

rubber roofing , 3/4 boards , 2x4 rafters . wide open now . will be drywall .

http://www.tigerfoam.com/

i'd just soon hire someone though .. learning curve thing .. By the time I'm done I know what I'm doing ..

also Pete when you do the underside of a roof are you using proper vent or something like that to leave an air space . thanks ..

It's not rocket science, but you probably can get someone to spray it for 1.13 a board foot.
I would think someone here might have a recommendation or at least a "no way" for a contractor.

map does it Eddie. I looked into it. They seemed fair.

Map Insulation Company Sagamore Beach, MA, 02562 - YP.com

2x4 rafters= structural foam,no venting needed...

120 Sq ft. 4 inches thick ,, R 26.8 I think he said . full 4" rough sawn . price $500.00 ... Paul's guy ... thanks Paul .

my pleasure, good luck and soon you will be done and sitting on your arse and enjoying all you hard work. I have spent the last month and a half doing just that at my place and it has been a lot of fun. Just towing the boat 6 miles each way to the ramp that used to be 45 each way has been a pleasure and when the albies show up it will be a half mile to the ramp. That being said I still got lots to do but taking some time off the slave driving schedule I was on since last August has been just what I needed to get some new energy needed for the next onslaught.

Met Gill today ,, wicked ,,pissa good guy ..

Job done ... Used these people .. They did a great job .. Thanks Paul ..

if you mind the question. what was the $ for the area they covered?

I needed it in 4 different areas where I had flat roof .. 120 sq ft all together 4" thick in rough sawn 4" bays.. one area I must have 8" in there . $500 .. small job . The inspector accepted it . Sometimes they'll make you put 1" rigid on top of that to bump it up over R30 ..I was trying to get max height on a low ceiling ..