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Hi guys, looking for advice. About to install a limestone floor. 900mm x 600mm x18mm on a 50mm poured screed encapsulating piped inderfloor heating sat on 170mm celotex. Ive struggled to convince the builder that I have to use an antu-cracking mat,(durabase probably) but Im having a real struggle to convince him that in my opinion the floor needs an expansion joint. Length of floor is approx 11 metres and width is 6metres. I was going to lay the slabs lengthways and install an expansion joint in a doorway between two rooms. However that leaves me an area of about 7metres x 6 metres open in the main floor. How and where can I put an expansion joint that isnt going to make it look like a supermarket floor. Any and all help gratefully received.