Failed underlayment under intact tile
Why it happens here
Salt air and coastal humidity break down roofing felt faster in Tremley than inland. The tile above still looks fine, so homeowners do not notice until water shows up inside. By then the underlayment has been failing for a year or more.
Our approach
We test underlayment with a moisture meter during every inspection. If it is failing but the tile is good, we recommend lift and relay instead of a full replacement. That saves the tile and roughly 40 percent of the cost.