I am about to do some "boxing in" of pipes etc in the bathroom, and wish to
tile the boxes after. How well will tiles stick to MDF? Should I prepare
the MDF surface first or use something else instead?
It would help to varnish the MDF first. This would reduce the
absorption of bathroom moisture and it would also prevent the
tile adhesive being sucked dry too soon.
Drop the EGG to email me.
When the MDF is flat they'll be OK. If you get any warping from
moisture effects, they'll pop off.
I use Valchromat for this, not MDF. It's pre-coloured MDF with extra
resin, so more stable in a moist environment. I've also used Viroc in
the past, a cement based board that's fit for outdoor use. However it's
so dusty you can't work it with your "good" saw, so I'm not altogether
keen on maching it.
As for adhesion, a coat of PVA first wouldn't hurt, but it works fine
I wouldn't use normal MDF and moisture resistant flooring chipboard is
only available in thick pieces. So some thinnish WBP ply or softwood
'construction WBP' or even OSB could be best, try boiling an offcut to
check you have the right stuff.
For sealing PVA or varnish should be fine, but worth checking with the
tile adhesive manufacturer.
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