On Sunday, 29 September 2019 10:03:42 UTC+1, Tim Lamb wrote:
Unbelievable an *on topic* thread:-)

Is there a time limit between laying oversite concrete and fitting the
insulation, dpc and screed?

Concrete drying time must be similar to screed and there are lots of
warnings about that. Does it matter if the insulation foil is in contact
with moist concrete?
--
Tim Lamb

Concrete doesn't set by "drying" (it will set underwater.)
A non-linear chemical reaction takes place.
You need to wet concrete down as is sets.

Chemicals in wet concrete will attack aluminium foil (strongly alkaline). You can buy a plastic film to put down to separate the two.

https://www.concreteconstruction.net...ect-concrete_o