Low Pitch Roof Ventilation

[jbladder]

I am about to lay underlay on a new 17.5 deg pitched single storey lean to extension on my house.
The roof is a wet roof with vented soffit boards, for ventilation can I take the underlay/ felt up to the ridge and leave a 5mm gap for ventilation, or do i have to take the underlay up the vertical wall to sit under the flashing and then fit vent tiles?
_____________________________
lynda, moderator

your title has been edited, see forum rule 5

 

[^woody^]

You can do either.

If you want to vent it at the wall abutment, then you need propriatary abutment ventilation strips - these sit under the lead.

Or just use a breathable felt