On Fri, 14 Dec 2007 14:56:57 +0000 The Natural Philosopher wrote :
Use polyurethane board: 25mm pu = 40mm eps
Even so I'd put a layer of plasterboard over the top.
Foam alone is not QUITE stiff enough to be safe for tiling..
Sorry, if I implied otherwise, it wasn't intentional.
--
Tony Bryer SDA UK 'Software to build on'
http://www.sda.co.uk