How to Fix Springy and Spongy Floors. Make sure to hit the floor from below, but exactly in the center.If you hit it from the sides it will do a lot less damage. A springy or spongy feeling could … Here you can find more info on the damage values, simply select the ways you can break it (melee, or if you can, guns, ...) and look at the available options. I suggest swords, they are the fastest and also very easy to make. No one likes the feel of a supposedly solid floor bouncing or sagging underfoot.