Hi,
I'm just fitting a filon dry GRP valley, and am seeing conflicting advice re: the detail on the membrane.
The main run of membrane that runs along the valley under the GRP is obvious. The question is how to lap in the runs that come in from the main roof. In the schematic below, which is correct:
Green - fit all membrane to the roof before laying the GRP side support battens.
Pink - lay side support battens and then membrane from the main roof is turned up against side of side battens.
Blue - lay roof membrane last and lap it into the valley.
Thanks
I'm just fitting a filon dry GRP valley, and am seeing conflicting advice re: the detail on the membrane.
The main run of membrane that runs along the valley under the GRP is obvious. The question is how to lap in the runs that come in from the main roof. In the schematic below, which is correct:
Green - fit all membrane to the roof before laying the GRP side support battens.
Pink - lay side support battens and then membrane from the main roof is turned up against side of side battens.
Blue - lay roof membrane last and lap it into the valley.
Thanks