Well - we set up screed pipes, with the top of the pipe being the elevation of the finished floor. Then you can measure down from your screed (lying on the screed pipes) to your sub-base. The level of accuracy is up to you and your budget. Gravel/sand is cheaper than concrete, but don't get chintzy on floor thickness. I think one of your earlier posts mentioned some heavy equipment in your shop. We always used CA-6 or CA-10 for sub-base material. Lots of fines/moisture makes it compact well. No sand for us, but there's nothing wrong with sand. Tamp it good with a turtle, or something else suitable for compaction. We set the reinforcing on chairs, then zip tie the pex to the reinforcment. If you have a high tensile fence wire spool, or can borrow one, you can easily spool the pex tubing off of the fence wire spool. It eliminates a lot of fighting with kinks. The kinks want to stick up above your screed pipe, and will cause you problems when you're finishing the floor surface. Think about how you want to zone your floor. Is there any areas that you want to maintain a warmer temp than say a larger storage area? Zone your tubing so the temperature differential can be accomplished. Are you hiring a finisher, or are you experienced well enough to finish it yourself? If you're hiring a finisher (often money well spent) see if he will come out and give you some helpful tips. A good one will do that. I have no advice for the various PSI board ratings. Good luck with your project!
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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