Hi all, I’m helping my friend put a new roof on his house and am pretty confident with doing straight forward square roofs the rear has an extension on it.

question for the pros, how do you go about where the roof meets up with the main roof to provide the right head lap on the course where both roofs meet?

any help would be much appreciated.

iv added a photo to better explained what I mean. The read line through the roof is where I mean where they meet y up.

thanks in advance 

Is the extension a continuation of the main roof? Similar to a cat slide or does it join at a funny angle?

Hi, it’s a continuation of the same roof

9 minutes ago, Alex1111 said:

Hi, it’s a continuation of the same roof

In that case lathe out for the main roof (to keep your full bottom tile) run down the extension to keep the same coursing (or you will see the join) and loose any odd bit at the bottom of the extension, no one will notice it there.

Yeah that was my first thought but I didn’t know if there was a way to end on a full tile at the bottom.

cheers for the help 👍🏼