Rats in the roof

:( Please help with any suggestions!! We have a flat roof so there is no access into the roof cavity. We are having a lot of problems with rats in the roof - I can hear them at night and they are driving me crazy. I think they may be getting in under the corrugated iron sheets from the gutter. I have shoved rat sack into vents, but the rats are still there. Have also put ratsack into bait stations around the house and the bait is being eaten, but I am not sure if they are all nesting in the roof??

How can I stop them from getting in under the corrugations? Does anyone have any cheap ideas? I know that I can get aluminium mesh, but that is quite expensive (about $1800). Any advice would be greatly appreciated...


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