Nicolafox, no we never did figure it out, but it has lessened over time, and some areas got lighter and others darker. The very distinct dark square areas are less defined now. We've just accepted it.

My walk in was well over a metre deep and width was a couple of metres to the wall. The glass screen was a metre and a bit so there was no splashing into the room. The shower came off the end wall same as the pic however it was one of those variable height showers on a rod, I have no doubt the shower in the pic will be splashing into the room which would drive me nuts. Mine looked great, so open, neat, big, except the floor hadn't been layed properly so instead of the water going toward the drain under the shower head it went all over the bathroom, nearly 3 metres out right down to the loo creating a massive puddle in front of the vanity as well. Getting it sorted with the builder was nightmare I eventually gave up and ended up having a low barrier installed from glass to wall. It still looked fine and stopped the problem but one really has to ensure the floor angle is done properly before embarking on the walk-in shower exercise.

Have been double waterproofing for many years and NEVER had a bathroom leak Have renovated many 100 yr old bathrooms 1..... Remove floorboards, check dimensions ,spacing and condition of bearers and joists and if level...More often than not 100 yr old homes do not meet 2020 Standards And all supporting timbers require replacement ( Not a big job, worth the effort ) 2....Plumber should check drainage, moving items easy and cheaper at this stage 2 ....Lower if necessary to level timbers and Scyon to finish 40 mm lower than outside floor, fix to manufacturers spec 3... Plumber to fit item pipes and drainage penetrations ( Puddle Flange ) consider location of floor waste ...may be preferable under vanity drainage for shower and floor waste.. 4....Waterproof entire floor, up walls 300mm shower etc to standards Prime and we use Davco K10 plus, 5... Add water bars to shower and doorway, Sikaflex , adhesive/sealant ( NEVER Silicane ) ALL Walls to floor.' Shower corners to 2000 mm Waterproof second coat 6...Tiler to lay tile bed and establish fall to floor and shower 7.. After drying, Polyester bandage shower walls to floor, Waterproof Third Coat 8... Final Coat of waterproofing 9...Tiler to tile Ii takes around 7 days to waterproof as for $ 50,000 bathrooms Any further questions, Pleas feel free,If in Sydney Contact

Discovery of our plumbers standards has been a bit of a surprise. Plumbers do waste water, tiler does tiles right? Not quite. Plumbers do the drain in the underfloor, then give the rest of the drain bits to "Zhong the tiler" who mounts the floor grate. It is supposed to mount on to a support 'collar' cut to length, that it is mechanically supported by the main drain fitting. This last weekend I examined why the grate was wobbly. NO support collar. There was a mortar job which had clearly 'slumped' at installation, so 'someone' (lets blame the tiler) used blobs of RTV sealant to build the grate up to the tile level. Swiftfix Plumbing of Papakura (Graeme Booker) was most indignant that he or his firm should be held responsible for ensuring that the 30 - 50mm gap between the tiles and the drain should be the Plumbers responsibility. WTF? Folks, check your drains for a cleanable, durable and mechanically stable support for the drain in your new shower renovation or get on to the plumber to do it properly. And call the Master Plumbers federation in Wellington. They seem about as useful as a chocolate fireman but demand they start acting like the industry watchdog. See attached pic. When the RTV crumbled and collapsed, the grate fell into the cavity and wobbles around like a drunken sailor. 2nd shower was the same. Don't get me started on the basins Thanks Switfix Plumbing. Nice job (if you're a shonky, lazy and/or one of the dodgy brothers).