Hello! this is my first post.... we want to finish our basement and it had water issues in the past but the previous owner installed an inside water removal system that shunts water to the sump pump and then out. you can see where the water came in in the past but so far (fingers crossed) after a year here we haven't seen any new water issues on the walls. the question is: can I put up polystyrene insulation without worrying about moisture collecting behind it and starting to collect mold? i don't want to finish the whole thing and then have to rip it all down (which is what they had to do). can i (should i) install some sort of plastic sheet that funnels water down to the channel around the outside of the interior walls? thank you for any help you all can give!!!