You might notice a brown water stain on a wall in your house and the source of the stain may be a leak in your roof. So, it's good to go up into the attic and look around to see if you can find the source of the leak. When you get up in the attic take a flashlight and look around at the boards that make up the roof. If you see any brown rings that is a sign that you have a roof leak. Water can leak through the roof and run down the rafter and into the wall. The best time to check for a roof leak is during a storm, but if that isn't possible have someone spray your roof with a hose so you can find the leak easier.