I'm trying to source some screw for my roof to samwich the blue board between the roof sheathing and the nailers .  The order will be  , 2x6 T&G roof decking , VB, , 2x4 nailers on 16" OC, 8.5 of SM board with 1/2 ply sheathing on top, with 2x10s cut to 8.5" around edges to box it in . But having a problem sourcing screws that are long enough , 8.5" long.

Would love to use yellow zinc #10, robinson or philips head flat head.

Try calling Mid-Valley Distributing in Fresno, CA.  They can get almost anything in fasteners and I have been using their services for hard to get stuff since 1974.

http://www.midvalleydist.com/

Mid Valley Distributors Inc
www.midvalleydist.com

3886 E Jensen Ave
Fresno, CA 93725
(559) 485-2660

looks like they are the winner

#14 x 8"

I was pretty sure that would be the only number you would need.  If I know them the price will be right too.

I got 3/8" x 12" lags from them for .38 each if I remember right.  Other places wanted up to $2.50 each.

They are selling stuff from a company that has a website that i was seriously thinking of buying from for about 1/3rd of price.  490 vs 179 and its the same part number.

Edit: that was tooooo good of a deal , they misquoted me , it was 179 per 500 not per 1000

ended up with `1500 for $531   :'(

Now I am curious. When you get a screw that long with a small diameter it would seem that they would snap off pretty easily. Would that be true? Just a picture that popped into my head.

Might be possible but if you run them with a drill or impact driver with an adjustable clutch such as Ryobi and others make it shouldn't be a problem.

5" of those inches are foam  so shouldn't be a problem torque wise

and they are #14 not the smaller size that I orginally wanted