You will want a couple of noggings across obviously - I would not support the full width at just the edges with 12mm.
You will want a couple of noggings across obviously - I would not support the full width at just the edges with 12mm.
Just a small point. I've used body filler a couple of times to prop up wonky WCs on tiles. Rock solid, even in the smallest of gaps (which I assume yours are). Pack out at a couple of points round the base, put the filler in between, then do the bits where the packing was. Trim with a Stanley blade while still in its "cheese" state. Too much movement in silicone for my liking. I've recently discovered plastic plant labels as packing pieces. 1mm thick and a nice convenient size for snapping off. Better than the wooden stirrers from Mc Donalds that TMH suggested :-)
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