I'm building a shed on a concrete base and am wondering whether to put some membrane beneath the floor.
I suspect the landscaper didn't put a DPM below the concrete.
My shed is actually going to sit on 40x40mm plastic battens. On the battens will go some tonge and groove P5 egger protect chipboard for the floor. The walls will be stud walls lined with OSB on the inside.
Even though no timber is going to be in contact with the concrete, I'd like to be safe so I'm considering draping something over the plastic battens before I put the chipboard down.
I first thought of visqueen type dpm, but then I got concerned that any condensation forming on top of the visqueen would get the underside of the chipboard wet while at the same time cutting down airflow past the chipboard - basically creating exactly the problem I'm trying to avoid. So then I thought perhaps a breather membrane (like under slate roofs) turned upside down?
What do you reckon?
I suspect the landscaper didn't put a DPM below the concrete.
My shed is actually going to sit on 40x40mm plastic battens. On the battens will go some tonge and groove P5 egger protect chipboard for the floor. The walls will be stud walls lined with OSB on the inside.
Even though no timber is going to be in contact with the concrete, I'd like to be safe so I'm considering draping something over the plastic battens before I put the chipboard down.
I first thought of visqueen type dpm, but then I got concerned that any condensation forming on top of the visqueen would get the underside of the chipboard wet while at the same time cutting down airflow past the chipboard - basically creating exactly the problem I'm trying to avoid. So then I thought perhaps a breather membrane (like under slate roofs) turned upside down?
What do you reckon?