There are lots of ways to mount piping, but I used a LOT of Clic hangers over the years. They make a very neat and serviceable installation.

I'm not sure what's happened; the original company (Litchfield International) now sells "HangerLok" hangers that are the same thing. Spears (PVC mfg) seems to be selling the original hangers, but you'd have to order through a plumbing or piping supply outfit. I bought them from an industrial PVC wholesaler in Atlanta.

http://www.aetnaplastics.com/site_me...t_Brochure.pdf
http://parts.spearsmfg.com/ProductDetails.aspx?pid=285

Amazon is selling a functional copy of the Clic hangers:

Plastic snap hanger for pipe and conduit