Sonotubes (not Sonatubes) are made for above ground use. Use Builders Tubes (trade name) instead as they are designed for burial and are less expensive. They are not termite proof but are less attractive to them. Try this TN for info on them 1-888-875-8754.
If you are not worried about water or rotting forms and you have solid packed soil, why not pour without a form and line the trench with Visquine (plastic sheathing). What is your application?
Last edited by Jacksnap : September 28th, 2004 at 09:01 PM.