exposed valley board failing

[jackg]

The ply of the valley board is rotting where it protrudes from the wall under the lead, due to the weather.
I did it this way to support the lead at the end of the valley to get the water to flow into the gutter.
I did not think the verge strip would be strong enough to support the lead.
So can someone advise on a solution for this please?
The verge strip is 150mm wide, I can use 300mm wide.

 

[Alastairreid]

Extend the undercloak and cut another tile into the valley.

 

[noseall]

The ply of the valley board is rotting where it protrudes from the wall under the lead, due to the weather.
I did it this way to support the lead at the end of the valley to get the water to flow into the gutter.
I did not think the verge strip would be strong enough to support the lead.
So can someone advise on a solution for this please?
The verge strip is 150mm wide, I can use 300mm wide.

Poor detailing.

In a situation like that, one should extend the bottom course of tiles so that you have full tiles beneath the valley exit. The lead should then finish slightly higher and lap on to the TOP of the bottom course of tiles.

 

[jackg]

As I understand it, you suggest to extend the undercloak and then to retile so the tiles extend further out from the wall?
From searching online the undercloak overhang is recommended to be no more than 50mm. Perhaps greater overhang is possible with 300m wide undercloak rather than the current 150mm? It would tend to sag with the weight of muck on it.
The pictures do not show the wall is not vertical and so there is 75mm undercloak overhang by the ridge tiles than the bottom of the valley (50mm).
It is not possible to add another course of tiles below the lowest one as a batten cannot be fixed in place.

 

[datarebal]

There's a good solution already posted . Bottom course of tiles on the main roof extend past valley centre .
Cut valley board back .
Lead from valley would finish onto the top of that first course . Not under it . Verge could then be extended to suit

 

[jackg]

Thank you, I misunderstood.

 

[noseall]

Thank you, I misunderstood.

As per Data. It will likely involve extending a rafter or two.