Just because you can’t see it doesn’t mean it isn’t a problem. When we do our pan flashing maintenance service packages on concrete tile roofs we often find leaks that the home owner was not aware of. This happens when the leak is close to the gutter edge and is therefore dripping through the soffit and not causing drywall damage. It can also happen if the roof leak is small and the amount of water getting in is not enough to cause notice. The final possibility is if the underlayment fabric is providing a shed and ushering the water down slope out into the gutter. Such was the case around the chimney in this Vancouver residence the other day. The wet wood on the side is proof of the leak. The value of preventative maintenance was clearly displayed to this agreeing and thankful owner.