A Mainline brand 4963 Backwater Valve installed in the main line below your basement floor is one of the most economical and effective ways that you can prevent your basement drain from backing up. If I've heard it once, I've heard it a thousand times, "I just had my basement drain o...
One thing I’d add that if you go with the foam board approach you should either caulk or spray foam a bead along the bottom of the board and the floor to eliminate any air gaps b/t the likely uneven concrete floor and the bottom edge of the boards. I like the composite decking ide...