Hello - Am building an extension with a lean to roof of 16 degress pitch and on the party wall side I need to build a parapet above the tile line. I plan to keep the parapet the same angle as the roof and wonder if anyone could give me some pointers in terms of the best recommended method of construction. Namely what would be the recommended height the parapet would need to go above the line roof tile . What is the best method of building the lead counter flashing into the parapet, is there a recommended way of capping the parapet wall and should I put a layer of DPC below the capping to stop any soakage down into the wall. All advice greatly appreciated.