we bought a house which is double brick and probably 3 years old.. we noticed bubbling in the paint on the bottom floor on the ceiling which was obviously due to water from the Bathroom upstairs. Plumber came and said theres no water leaking from plumbing (not sure how he came to that conclusion).. the builder has gone bust so theres no help from him!! .. a company came out and said the water is leaking through the grout and seaping through etc.. because the grout has cracks and gaps ( flat squared tiles closely together with very thin grout) and we should regrout the whole bathroom. now if this IS the case that would tell me that theres no waterproofing behind the tiles in the first place in the wet areas? or perhaps the water gets past the cracked grout and hits the waterproofing and slowly creaping to non-waterproofed areas and making its way out through the concrete/brick walls etc.. if that makes sense . .all theories ..
soo my question is .. will regrouting again with perhaps a grout sealant after possibly fix the issue .. or is this a waste of time if potentially theres no waterproofing (which cant be confirmed) .. in which case retile the hole bathroom which seems extreme being that its all relatively new and looks like with expensive tiles.
any ideas, comments . suggestions? thanks in advance,, im heading towards a regrout and reseal the wet areas