I read somewhere that the Plywood base that the shower tray is bedded upon should be 22 mm marine ply.  My local timber merchants only stocks 18 mm.  If I reduce the spacing between the timbers on which it will stand will that be OK?  The shower is a Matki and measures 1200 x 800 mm.

Or should I bond a piece of thinner marine ply on top of the 18 mm to achieve a minimum of 22 mm?

I had to buy a whole sheet and so could use another thickness of 18 mm [total of 36 mm] but that seems a bit like overkill?

Oh and I read somewhere that it may be necessary to make an inspection facility to access the waste?  The Matki shower tray comes with a low profile (remarkably like the Hep Trap) waste.  So my questions this – is an inspection facility required and if so how the hell can it be achieved whilst still maintaining a strong stable base for the shower tray?

Any advice gratefully received and acted upon

[quote author=billythekid  link=1118264105/0#1 date=1118266819] ...just for the fitting you will need a way of getting your waste pipework all connected up to the trap.
btk [/quote]

Which leads me to ask how you install one of these...?

[quote author=CWatters  link=1118264105/0#2 date=1118304645]

Which leads me to ask how you install one of these...?





[/quote]
hopefully, before the tiler! lol

btk