Vapour barrier


Concrete is pourous, so in order to keep the floor of the shop dry when the ground it wet, a sealed layer of plastic is put down under the concrete.



Here 6 mil poly is used, the edges should be overlapped by about 12" and its all seamed with tuck tape. Where pipes come through, the tape is used to make a seal around it.






Any accidentaly holes punch in the plastic are fixed up with more tape, as can just be seen here where a piece of rebar punched a hole in it.



This plastic should extend to the verry edge of the form. It may be good to save this as a final task before pouring concrete, as it may get moved around before.