Post by Andy BurnsPost by AndrewSounds like the builders laid insulation right on top of the beam
and block surface
Which the Ballytherm website says is an acceptable installation method.
<http://www.ballytherm.co.uk/floor-insulation/insulation-above-precast-concrete-floors>
Every time I see a house being built near me (SE England) using beam and
block, they *always* pour/brush screed over the structure for some
reason, and it makes no sense to have rigid insulation effectively
supported on the high spots, i.e. the slightly proud ridge along
the tops of the beams.
If the upper surface of the blocks is flush with the tops of the
beams then no screeding would be necessary, but we don't know
what happened to the OPs property during construction. All we do
know is that the subfloor is flexing and/or sagging making his
floor tiles crack.
BAllythem sounds like Ireland and dodgy builders are commonplace.
I worked with a guy from Southern Ireland and the stories he told
me about builders and planning violations were hair-raising.