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[Sprinter]

For those interested, there are some great spray foam kits readily available thru Menards starting at $1/bf which is less than market rate.

Several options that are excellent for doing trenches and your own underground lines.  Encased in PVC using slow rise injected and you have a product as good or better and cheaper than most market brands.
Also good for repair if you wanted to.

Buying online, you get hit withthe $100 plus shipping per kit, since a 300bf kit weighs over a hundred lbs. menards covers this as long as you can wait or buy off the shelf. Foam it green has great product line too for same or lower price than the DOW product but once again shipping is a killer. Either way it's still a project that is not cost prohibitive.

http://www.menards.com/main/paint/caulking-sealants/foam-sealant-and-insulation/froth-pak-620-b-polyol-foam-sealant/p-1625331-c-7937.htm

[Coyote556]

Ever done the math and compared prices to higher end lines like rahau or logstor?

[userdk]

I know someone who did the math and they said by the time it's done you're better off buying a standard premade line

[mlappin]

Which brand of pre-made line though?

Might have a warranty with the pre made which is something in itself.

[userdk]

Depends what kind of performance you want. For a more economical type, some companies make stuff in corrugated drain tile that comes with either 3 or 5 wraps of bubble wrap insulation. Available on eBay I think. We have 3 wrap and it's never caused any problems whatsoever. Maybe we don't know what we're missing. They also sell solid core foam stuff also available on eBay. It loses less heat and isn't supposed to be able to water-log. Rau-Pex should be good. Really there are all kinds of brands and it should all be good stuff.

[Coyote556]

If we were doing comparisons, I would think it would have to be to Logstor or Rehau for a real comparison.  I could be wrong, but that's just my opinion. 

[Sprinter]

Yes, when doing a comparison , logstor is the industry leader/standard by which everyone else tries to meet.

I'll get some numbers here, but it works out for custom sizes and long lengths. 1.25ID and larger and over 200' of pipe.  Since anything over 1.25ID usually has to be ordered and takes a long time and the price per foot skyrockets.

For example 4" PVC $1.43/ft.
1.5" wirsbo     $3.53/ft
100' of 4" PVC has a volume of 8.8 cu/ft.
Dow froth Pak 120= 10 cu/ft for $180
Dow froth pak 200. 16.8 cu/ft.  $299 when on sale
4x8 sheet of foam board 1" $20
Equals $6.96 per foot not including extra PVC fittings to get logstor performance

One you have rigid PVC but flexible for ground movement going to 6" PVC adds $2.57/ft with bell ends,  using 6" SDR adds $1.82/ft,  going to 2" pex like on the farm adds $2.67/ft.
Keeping you far below market prices and allows for underground splicing
It is a lot of prep work but it's the same way logstor actually does it on site at stadiums for example doing huge projects.

[userdk]

Ebay Search Results for insulated underground line. Looks like they have several options