Conservatory and Kitchen Floor Marble Tiles

[Old Mod]

If the tiler you're thinking of using is competent enough to realise the weight issues surrounding substrates, there's a fair chance he knows what he's doing. Weight limits are one of the lesser known areas of our industry.
As far as your tile choice for downstairs is concerned, personally I don't know the product, and so far in to the thread as we are, you are reducing the chances of someone who does, seeing your choice. If a thread holds no interest to someone, they tend to stop revisiting quickly.
Maybe start a fresh thread concerned only with the tile choice, but it's not guaranteed you'll find someone who knows it.
As a very general rule of thumb, if the manufacturers guidelines fit your requirement and they are installed correctly, then they should be ok.
But we all understand the concept, 'you get what you pay for!'
Ultimately the choice is yours.

 

[DavidP-TUFHS]

Firstly excellent advice throughout given by 3_fall.

Secondly to drop my 2p in regarding the underfloor heating - a 200w per sqm system is ideal for heating conservatories and other high heat loss areas so this is a definite viable option for you if you want the floor heated. There is also nothing stopping you going through with the same system into the kitchen.The only time I would say underfloor heating is a bad idea would be in the situation of Quartz as it has a known tendency to curl or tent with heat.

As it will be natural stone on the top I personally and many others on here would advise that the floorfinish be decoupled from the UFH (should you choose to install it) to prevent any potential issues with thermal expansion and contraction.

 

[J Sid]

good advice from both above.

200w ufh would be fine. I would probably not uncouple if the stone is good quality, would need to see it. Make sure of an expansion joint around perimeter

 

[Fraser Tiling]

Just posted in the forum arms about a 457x305 8mm white marble tile supplied by tops. Waiting for a reply about my reservations about it.
Hope you dont share the same problem with your tiles.