@Libbylou said:
The previous lot owner, who had “exclusive use”, damaged the roof by hammering floorboards into the waterproof membrane, but every lot owner had to pay to get it fixed (and still do if there’s damage caused by us).
Where does it say that the membrane has to be repaired at the Owners Corps expense? If it’s in the exclusive use by-law, than fair enough. But while the Common Property is the responsibility of the Owners Corp, damage done to it is the responsibility of the person who does the damage.
You really need to follow Lady P’s advice and go and look at your by-laws (which your secretary should have anyway, if only because every new tenant is required by law to be given a set).