Is the situation different if the water issue is not related to faulty membrane – but is actually due to a split original copper water pipe – embedded in a concrete block. Where access to the water pipe requires substantial building works including the removal of bathroom tiles; entry into the ceiling space and heavy drilling into the concrete slab. Just gaining access to the split section caused severe damage to an owners apartment – aside from the inconvenience – is the OC responsible for the entire “fix-up” including new bathroom tiles. The building is more than 40 years old and the bathroom was still original.