To help improve the aesthetic look of tile roofs specifies occasionally request cap tiles to be installed down the valley area. Tile manufacturers have released technical bulletins warning of issues arising from this practice. When cap tiles are installed in the valley area moisture is trapped and not allowed to flow properly causing underlayment deterioration and flashing rust. Although not worth the time and money to proactively remove, when repairs are made to the valley, the cap tile should not be replaced.
Straight Line is 1 of 5 contractors in California that is certified by all 3 major roofing manufacturers