Any one come across this before !

[newlineuk]

there is an external wall. and 3 internal partition walls that have metal bottom plates that are not fixed to the floor ,the problem does not go past the partion walls at all, stops dead,

mmmm.... did someone forget to dpm that room after 500m2 or should I say 460m2

 

[ozboz]

the whole slab is prob around 700m2, all partion walls internally, any probs with drains dpm's etc would not be isolated to two rooms, thats whats got me beat !

 

[newlineuk]

the whole slab is prob around 700m2, all partion walls internally, any probs with drains dpm's etc would not be isolated to two rooms, thats whats got me beat !

Buckets of water thrown around those rooms to wash down? got under sheet and never dried out?

 

[ozboz]

no, I asked that, this fac tory is more like a lab, they make special bits for RR aircraft engines and stuff like like that, the factory is heated to a 15' temp day and night, its really odd, once the air got to it it dried to that brown colour ond then chipped off with the scarifyer, no visual signs of any moistur signs under adhesive, mad as !,

 

[tfs]

I have seen this often and it is pretty much due to presence of of dampness, or water damage. In my experience it seems to be most common in pubs and school toilets for some reason (possibly due to spilligaes etc and lack of care when cleaning.