I am a fan of the Rain Escape system. As far as I know it's the only one that gives a real leak-proof guarantee. The types that snap up from underneath generally say 'some dripping'.

I'm not familiar with Rain Escape, but in researching this issue for my own deck (yet to be built), I settled on a system called DekDrain (dekdrain.com). I especially like the lifetime warranty. They use rubber, like inner tube material to channel the water. I'll take a look at Rain Escape though, maybe I'll change my mind.

Thank you for your responses. I had not heard of DekDrain and found a contractor in our area who will be providing an estimate to install that system. I have to say that I was surprised at the cost for these systems to be installed! We are not DIY'ers so we need to rely on the contractor to install.

Thanks again!

I'm considering such a system, too. Looking at DrySnap, Underdeck Oasis and just added Inside Out to the list. As far as i can tell they are similar except for materials used. I would love to get some feedback on any of these underdeck systems. I am most interested in performance, minimizing trapped moisture (hence mildew, rot etc.) It's going under Trex. Thanks for any opinions.

@Ellessebee @winchesterva @solarmax2001 what did you end up using and have you been happy with it?