I have a 26-year-old tile roof. Lately, theres been a leak in the valley portion of the roof and was told that the underlayment should be replaced. What underlayment is presently recommended?
The valley detail can be repaired by removing the tiles in the general area of the junction and repairing the area with an SBS modified bitumen self-adhered membrane. There is also some metal lining in the valley that probably should be replaced. Not knowing the type of installation is a handicap in developing a detailed course of action. Salvaging the cut pieces would make the job much easier, obviously. Salvaging the field tiles around the area is also important, because replacement tiles are not readily available. Usually in repair cases such as this, tiles will be broken in the process (usually 25%).
