I received and put this together and noticed major flaws for outdoor use. It's incredibly light and flimsy, and barely touching the roof will cause a cave-in. I felt it might fly away with a decent wind (even with them under a porch), so I added a spare concrete block inside the house, and placed the pillow over it. If you do buy these, be aware they are not made to be remotely sturdy, and a wind can pick up the house, or at the very least scaring the cat to not use it. Lowes sells the concrete See full review