Concrete floor problem..

[Shabs]

I have just laid a concrete floor and put down the damp proof membrane under the concrete.

It has been about 6-8 weeks since that was done and if i leave anything on the floor, a puddle of water appears. Why is that..

I left a stanley knife and hammer on the floor and the hammer started to rust. The stanley knife had droplets of water on the underside.

[Tony Bryer]

Because it's still drying out. One figure quoted is that slabs take one week per 1/4" thickness to fully dry out, though of course this will vary with temperature and humidity. So if yours is a 4" slab it may take another couple of months or so.

[Shabs]

Thanks Tony, that'll explain it then. I must admit, the slab is up to

6 inches in places and with regards to humidity and temperature, it is outside in the cold but it is covered with a roof so that will mean up to 6 months drying time then i think.