Remove tiles hit problem


­House built 30 yrs plus husband (Deceased) put on tiles in bathroom when moved in. Now I felt that bathroom needs a make over so started to remove tiles to find a sand base under removal.
My question is will I have to plaster skim the walls first before I retile or is it better to plaster and paint instead. With tiles around splash area only. Or put lining paper on instead.
Any help and please no comments that says a woman cant do thank you.
BP
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The sand is probably mortar. It may have been used to stick the tiles on (is there any other adhesive residue?). Is the mortar surface solid or crumbly/dusty?

Depends on the condition of the mortar.
--
Andrew Gabriel

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writes:

The grout used for tiles comes off with most of tiles when removed, small odd patches on wall. The sand mortar is pitted and odd crumble in places will not know full state of wall condition till remove all the tiles from said walls. And done brush down to remove any of residue grout.
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