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Even cuts top and bottom.

Postpone your plumber, get the right sized sink. Anything else is a bodge.

Ideally you'd use a mechanical fixing but with a bit of Dow 785 it won't move.

Tank it with the Mapei kit from Screwfix and tile away.

Why would you use an adhesive that the manufacturer specifically says is unsuitable for the tiles that you're fixing? What's a small bag of rapidset to do the job right? £10?

I'd say I moved over to tanking all wet areas about four years ago. No failures as yet. It's a non biodegradable membrane with mechanical protection (i.e. behind tiles). No reason to think it should fail.

Can't help unfortunately but it's what I use on all my installations. Mapei make quality products.

Standard plasterboard tanked with this is completely waterproof... https://www.screwfix.com/p/mapei-shower-waterproofing-kit/78484#_=p Use a quality silicone (Dow 785) at any junctions... https://www.screwfix.com/p/dow-corning-785-bacteria-resistant-sanitary-silicone-white-310ml/58308 Use a...

Remove the laminate. Overlay the chipboard with 'no more ply' glued and screwed. Tile onto that with a decent quality powdered cement based flexible adhesive and grout.

Assuming 7 days in a habitable/heated house I’d say you’d be pretty safe with easifill. When you fill go slightly proud so you can sand back/feather it in. Ideally Mist the chase with watered down contract followed by a couple of coats of vinyl matt.

Hard to say with easy-fill. If you were using bonding/hardwall and multi-finish you would be able to see. I know for screed they say 1mm per day. All depends on the depth of the chases, the temperature, humidity etc. With a contract it wouldn't matter as it can breathe. Vinyl and you're sealing...

They do work. They're just not waterproof.

Hardie isn't waterproof.

Which board are you using that is waterproof?

Tanking the joints of cement boards won't make it waterproof. Cement boards aren't waterproof. Just use regular plasterboard and tank it all. Far cheaper.

As above. Easi-fill is your friend. A chase won't be dry in 48 hours. If you absolutely must paint it make sure you use a contract matt emulsion (not vinyl matt or vinyl silk).

Not a product I've used. Homelux do state that when correctly installed it is totally waterproof so I see no reason not to use it. The reason I favour the mapei kit is that it's so quick and easy. Sort your corners out and just paint it on. No mixing and spreading tile adhesive and sticking big...

So long as they're tanking whatever they're using you'll be fine.

There are two schools of thought yes. The right one and the wrong one. PVA has no place in tiling. There's science behind the reason.

If the plasterboard that is there is in good condition then the only additional cost is the tanking. If the plasterboard is in need of replacement then I use the most cost effective material to replace it with. Plasterboard. There is no reason not to use ply. It's just more expensive and more...