Grouting slate

[Jilly]

I've bought some dark grey riven slate tiles and they are going down nicely, but they are going to be hard to eep clean.

 

Im' reading stuff which says they should be sealed before grouting as the coloured grout can bleed later. Is this right? The builder can't see the point in sealing twice. 

[JanetE]

The chap that laid our grey riven slate sealed it before and after grouting.  It still looks really good, so I think that's the way to go.  Our grout is pale grey and does get quite dirty but I have recently invested in a steam cleaner which works really well. We love this flooring.