Pool Over Garage . A rooftop bio pool above the garage. While the terms are sometimes used interchangeably, they are different. Pin on Picture Perfect from www.pinterest.com Water weighs 8.33lbs per gallon x 4600 gallons for your pool size = 38300 lbs in your garage. Place the pool table away from the center of the garage if you have enough space. This garage game room/bar is the ultimate man cave and is just teeming with masculinity.