I have found a good tip for startup players! some buildings, like light factory needs like 3x3 tile for full health isnt? nope, it need 3x2! i had tested it, so when u placing concrete 3x2 like on this image: And placing light factory on it and click it: Voila! We have full health light factory now! It works with:Barracks,Wind Traps, Light Factories, Heavy Factories, Tech buildings and Refineries. Doesnt work with:Starports, Repair Pads, and buildings that need only one tile.