Tiling fire hearth

[panza]

I have got some sandstone paving slabs that I would like to lay over my existing concrete heath. The slabs are quite rustic and have irregular top and bottom surfaces.

Can anyone give me any advise on the best method of laying, tile adhesive or mortar bed? I've done a bit of a search online and there does not seem to be any conclusive guidance.

If bedding the slabs on a mortar, any recommendations on mortar depth?

Do sandstone slabs need to be sealed before laying to prevent staining, or is staining not an issue with sandstone?

I would appreciate some help.

Thanks, Panza

 

[lancenotalot]

Bed them using flexible tile adhesive and yes they will need sealing to make cleaning easier.