Weve now appointed a builder to install the floor and bathroom. As the first fixing of pipework leaked our builder has had to rip up a bit of the chip board floor as it's now water damaged.
On doing so he expressed major concerns that the company we have used has used raw building sand directly under wayrock for internal flooring.
It has DPC then raw sand on top followed by chip board. Our builder has now refused to carry on as he said that floor is not fit for purpose. There is no insulation.
Weve contacted the company who have said this is a common practice and will therefore only fix the warped chip board.
As we are getting conflicting information just wanted to get some thoughts?