Here are some quick tips to help you track down difficult leaks. However, you’ll need to enlist a friend.
Go up to the roof with a garden hose and start low. Spray water on the area right above where you think the leak is coming from inside.
Your friend’s job is to watch for a leak inside and yell when he sees it.
If the garden hose turns out to be useless, toss it aside and start lifting up shingles in the suspected area. Some signs you’re in the right spot include the following:
• Rotten wood
• Water stained felt paper
• Possibly mold
Remember to be careful. A wet roof can be slippery!