Hi,
I have possibly cocked up my extension slab, here are the details.
My floor construction is as follows,
40mm rejects infill around footings, 150mm MOT type 1, sand blinding, DPM, 100mm Celotex, DPM, 150mm concrete.
The reason for the second DPM above Celotex is the building inspector said, 'you cant lay concrete on top of the Celotex, just put another sheet of DPM across and concrete over that'.
Without thinking to much thats what I did.
Fast forward 8 odd weeks (whilst building a garage) I have now come to put the walls up on the extension.
I have noticed the following, the layer of Celotex sandwiched inbetween the two DPM's has filled with water!!!!
I have punctured a couple of holes around the edge of the lower DPM allowing the water to drain out. This still mantains the integrity of the DPM below the concrete.
My question is, is this OK or am I going to have to break up the slab and start over, due to not knowing how 'wet' the celotex is. I appreciate wet Celotex loses its efficiency.
Really don't want to break up the concrete and re-lay it, but also dont want any damp issues either.
Any help/suggestions greatly appreciated.
I have possibly cocked up my extension slab, here are the details.
My floor construction is as follows,
40mm rejects infill around footings, 150mm MOT type 1, sand blinding, DPM, 100mm Celotex, DPM, 150mm concrete.
The reason for the second DPM above Celotex is the building inspector said, 'you cant lay concrete on top of the Celotex, just put another sheet of DPM across and concrete over that'.
Without thinking to much thats what I did.
Fast forward 8 odd weeks (whilst building a garage) I have now come to put the walls up on the extension.
I have noticed the following, the layer of Celotex sandwiched inbetween the two DPM's has filled with water!!!!
I have punctured a couple of holes around the edge of the lower DPM allowing the water to drain out. This still mantains the integrity of the DPM below the concrete.
My question is, is this OK or am I going to have to break up the slab and start over, due to not knowing how 'wet' the celotex is. I appreciate wet Celotex loses its efficiency.
Really don't want to break up the concrete and re-lay it, but also dont want any damp issues either.
Any help/suggestions greatly appreciated.