porc's and grout cracking on ditra on screed

[Ajax123]

yes.. the developer can see for himself, the technique, materials supplied installed.. all technically correct.. as i said to him, in 24 years i have never had 1 tile crack on a floor, let alone 6, and happen twice on the same tiles, its a UFH problem, and the cracking grout, which dissapears when UFH off, well says it all.. personally..i think the system isn't balanced at flow to run at 37.5-45 approx to achieve an ambient 22-28 air temp as you quite rightly stated. Thx.. arrrrr. was bugging me, as don't like to see my work trashed :-(

yes I can understand that but in consolation at least it's not your fault.