Hay stored on top of cement floors can accumulate moisture during the warmer months. To prevent losing the hay, go to your local lumber store and purchase a few 2 x 4 boards.? For a storage area of approximately 4 x 8 feet, you’ll need three 8-foot boards and one piece of plywood. Space the boards evenly apart and put the plywood on top of that. Then store your hay on the plywood. The hay is off of the ground with air circulation under the plywood, so the hay won?t absorb the humidity from the cement floor. Hint: You may think wood pallets would be easier. Think again. Spiders and mice think pallets make great homes, and wood pallets are not easy to sweep clean.