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Help! Tiled wetroom floor looks perfect but grout doesn't dry out!
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[QUOTE="SJPurdy, post: 766970"] If the grout is filling the joints and there are no bits missing then I think it unlikely that sufficient water has permiated through it to fill any small cavities in the adhesive layer (if there are any). As already stated many grouts (even white and light coloured ones) change there shade slightly when they are damp (due to some water absorption) - this much less now with the modern modified (CG2) grouts. I am baffled by why only some of the grout "50%" remains dark in the wet area. Look closely at these joints to check that there is no (microscopic) cracking along these grout lines. I have experienced the grout joints between mosaic sheets taking longer to dry out than the joints between the 'mosaic attached to the mesh backing' when fitted over the self adhesive flexible black water proof membrane (that I think was Impey) and I deduced this was because the membrane remained compressible and the point loading on mosaic caused 'only jut visible' cracks in the grout and these took longer to dry out. No one has reported to me this problem when I have fitted larger porcelain tiles (but it would be less visible as the wet and dry joints would be further apart). I think using a wet room twice a day you are always going to have dampness in the wet area grout which is why the substrate underneath must be tanked. Different brands of grout will have more or less difference in there wet/dry colour shade. Sealing over the grout when dry may prevent/lessen the water absorption of the grout - In my wet room I do not notice any colour change in the grout when wet ( I haven't specifically looked for it) but it has been sealed along with the natural stone mosaic so the water pools on the surface. In your case I think that if there are no faults/cracks in the grout then I would try using a sealer over the grout (when dry) to see if this improves things before doing anything more drastic. [/QUOTE]
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Help! Tiled wetroom floor looks perfect but grout doesn't dry out!
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