Im having my house reroofed at the moment and have a concern over the way that the roofer has detailed the valleys on my dormers.
The dormer roof ridge is at the same height of the main roof and I was expecting to see a single strip of breathable membrane run down the valley on either side with the lead sat on top of this. The tiles would then sit over the leadwork.
Instead, the breathable membrane sits over the lip of the lead on either side (I am told by the roofer that this is a standard way of doing this detail) with the tiles over the top of this.
Can anyone put my mind at rest over this as I cant see that this is as watertight as what I was expecting to see?
The dormer roof ridge is at the same height of the main roof and I was expecting to see a single strip of breathable membrane run down the valley on either side with the lead sat on top of this. The tiles would then sit over the leadwork.
Instead, the breathable membrane sits over the lip of the lead on either side (I am told by the roofer that this is a standard way of doing this detail) with the tiles over the top of this.
Can anyone put my mind at rest over this as I cant see that this is as watertight as what I was expecting to see?