Type of rails used for bedding sand?

[Clarkscape]

Guys,
Over the past 4/5 years I have used 1" galvanised steel rails to set my grade for installing my bedding sand. I've noticed that some of the rails are no longer true, as I remember them when I bought them. Some now have slight bends to them so I am weeding them out. Before I buy more, I had a question...
I saw another guy using 3/4" or 1" cube stock, steel rails and wondered if maybe they were a more durable than what I have been using. Thoughts? What do you use?

[DVS Hardscaper]

I use 1" od steel pipe.

If you wanna be like me then that's what you gotta do




.
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[alldayrj]

I use 3/4" gas pipe and union them together
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[big daddy b]

Contractors are still using pipes?
I use them once and a while when it's a square or somthing similar prep. 1" EMT GAL Pipe I found works the best. I've seen some other guys out there using PVC, 2x4's and 1/4" metal pipes.
Definitely want to go with a 1" pipe.

[2low4NH]

I have used gas pipe and pvc both work well if your base is flat the pvc is great. if you have imperfections go steel. thick wall is a must.

[alldayrj]

Yea i found pvc to be too much work to keep straight. If youre going to do this more than once just buy the gas pipe
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[scagrider22]

We use 1" O.D steel pipe and I weld a piece of 3/4" pipe inside them sticking out about 6"s on one end so I can slide the pipes together making them as long as I want. It also keeps your screed from hanging up on the unions.