Hi
I'm designing a single storey lean to extension for the rear of my house. The extension will envelope 2 french doors which currently lead into the back garden.
The roof will meet the main walls just under the first floor windows.
Because I have an external wall, which will now become internal, do I need to break out the outer leaf and install a cavity tray where the roof meets the wall or could I just chase the flashing 30mm or so into the joint in the outer leaf?
Thanks
I'm designing a single storey lean to extension for the rear of my house. The extension will envelope 2 french doors which currently lead into the back garden.
The roof will meet the main walls just under the first floor windows.
Because I have an external wall, which will now become internal, do I need to break out the outer leaf and install a cavity tray where the roof meets the wall or could I just chase the flashing 30mm or so into the joint in the outer leaf?
Thanks