www.ultimatehandyman.co.uk

defo grout ere mate but seal proir to this then after..


can i be honest here mate...
you should have layed your sheets down on a flat surface an TAKEN the thinner ones out then then back buttered then, till level with thicker ones OR taken thicker one out and fitted either at side/bottom/top of wall and back buttered thinner one to suit.

I don't think grout will hold in such thin lines.

You should have been supplied with a sealer for the slate. I would suggest trying to push this well into the cracks when you seal the fronts..

It may be that they are decorative tiles only and not for use in wet areas. I have seen similar around a fireplace.