Plywood types

[i_am_fubar]

Hi there, am looking through the various ply woods I could use on the floor. The thickness options are 18mm or 25mm (any thoughts on which is better?)

But looking at my local supplier, they do quite a few types. Considering that this is only for a toilet (so no constant moisture), which of the following would you suggest?

[link] http://www.chandlers-ford-timber.com/sheet_material.html [/link]

Quoted £30.35 for 4'x8' 18mm, and £45.61 for 25mm of external grade. Do these prices sound fair?

Sam.

 

[Symptoms]

fubar - 18mm Exterior Grade. Selco (I don't know if there's one near you) are doing it for £13.55 + the dreaded as a Nov/Dec Saver.