Roof Drainage Design Problem Information, help and tips on many areas of roofing including trusses, tiling, venting, insulation etc....

[Paul1926]

Hi all, I am looking for a drainage solution for where two roofs meet as shown in the drawing. Currently there is a single storey detached annexe and a main bungalow. Both roofs have a 20 degree pitch and are offset from one another by 750mm. Any suggestions?