Large format slate 1200 x 900 on UFH

[lewie]

Uncalibrated from Mandarin Stone

http://www.mandarinstone.com/product/_/299/black-riven-slate-tile/?cid=19#.VC4wSmddWSo

A difficult one to price up methinks

 

[Time's Ran Out]

So it's 25-35mm thick flagstones!
How long had the screed been down and has the UFH been on?

 

[Dave]

What screed type is it ?

 

[m3fitter]

a sharp bolster comes to mind..... lol ;-)

 

[lewie]

It looks like a concrete screed

 

[Dave]

It looks like a concrete screed

What looks like might not be ... Have you ever come across anhydrite ?