If you can’t find the cause of a leak, wait for dry weather and ask a friend to help you do a water test. To do this, one person goes onto the roof with a garden hose; the other person goes inside the attic with a bucket and a strong light.

The person in the attic watches carefully while the one on the roof floods the roof with a hose, starting at the eaves and slowly working uproof until the leak appears in the attic. Once the leak is found, push a nail up through the hole to mark its location for rooftop repair.

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