My husband is in the midst of construcing a screened porch under our deck. However, he is having a hard time coming up with how he is going to keep rain/snow from down into the porch below. We have seen the 'Dry-Be-Lo' systems but he would like to figure out how to do this on his own without purchasing that expensive system. Any ideas on ways to either do something to the above deck to keep rain from dropping below or something to put under the deck to block the rain? We do have some beams that may get in the way of an under deck system however so that is an issue also. Any advise would be greatly appreciated.