Posted: Thu Apr 26, 2007 11:19 am
I have recently had the roof above a double garage re-paved using slabs, but have drainage problems (water from the roof running down the walls of the garage). The house is in France and the roof is a beam and block roof with a reinforced concrete layer (which is waterproof) above the beam and block. The new slabs have been laid on lime mortar mixed with a waterproof agent on top of the reinforced concrete layer.
The slabs are designed to be laid without pointing or sand between them, and I suspect that the slabs have been laid on blobs of mortar rather than on a screed surface.
If I pour 30-40 litres of water onto the slabs, water soaks into the terrace (there is a fall, but the water "soaks" in rather than following the fall)....and then over several days after, the water oozes out of the lime mortar layer at the edge of the roof. The area of the terrace is 30 square metres.
I have stopped the builder doing any further work - and he hasn't any solutions.
Has anyone any suggestions, please?
The slabs are designed to be laid without pointing or sand between them, and I suspect that the slabs have been laid on blobs of mortar rather than on a screed surface.
If I pour 30-40 litres of water onto the slabs, water soaks into the terrace (there is a fall, but the water "soaks" in rather than following the fall)....and then over several days after, the water oozes out of the lime mortar layer at the edge of the roof. The area of the terrace is 30 square metres.
I have stopped the builder doing any further work - and he hasn't any solutions.
Has anyone any suggestions, please?
