My house is 13 years old with a shake roof. Several months ago I noticed a stain on the ceiling of one of my bedrooms and today I have a new one in the master bath. My dad says I can go up into the attic and try and find the leak and patch it with some tar or some sort of roof patch sealant... Is this possible? I told him I should call a professional to look at it but he told me not to do that. Any help would be greatly appreciated. Thanks, Kevin