Flashing underneath a bay

[kreyszig]

So I've been re-slating a single storey roof with a rectangular bay over. The original bay had lead flashing nailed onto lath and was then rendered over. The rendering being rough cast, and not quite being ready to learn rough cast rendering, I attempted to put new lead over the top by cutting in to the render. That presented two problems; 1) the render was only about half an inch (if that) thick, so there wasn't much to insert the flashing into, and 2) the render promptly fell off the bay leaving me staring at the old lead and wondering what to do next.

Any ideas how to sort this? I have tried nailing the lead in place with enough of a lip that I can fold it back over the nails, however the fold looks pretty awful. I put a strip of wood behind it to bring it fairly flush with the render above. I am leaning towards just using the original approach and getting someone in to do the rendering, but perhaps there's a better solution out there. Worth asking anyway!

 

[DJH]

A photo would be helpful if that's possible...

 

[kreyszig]

No photo to hand (why would I take a photo of a job going badly?! ;-)) at the moment I'm afraid.

If you can picture a first floor rectangular bay window with a sloping slate roof underneath it, I am talking about the lead flashing where the bay meets the roof. The slope of the roof runs such that the roof/bay join at the front of the bay is level, and runs at an angle on the sides of the bay.

The bay is constructed from wood, so there's about half an inch of roughcast render on top of laths which are on top of a more substantial wooden frame.

I've (inadvertently) cut off about 4 inches of render from the bottom of front of the bay. Ditto the sides of the bay, render has come off underneath the gap I cut to insert the lead.

Fwiw I haven't actually started slating yet; I thought I'd get the lead in place first so I wasn't doing this on top of freshly laid slate. I figure I can lift the lead up to nail in the top slates and finish the lead off properly once they're done.

Edit: photo attached below. You can see where I've folded the lead over the nail line. It might not be so bad if I could get that fold to look half decent and a bit closer to the render above. The rest is also a mess, I'm well aware!
Perhaps if I give it a good belt with some proper tools? I've just been using a crudely shaped piece of wood so far.

 

[Zebra]

Might have misunderstood the problem, but wouldn't you hack off the render a bit, run the lead up the wall, stick a dripbead over, glue between dripbead and lead with an expandable mastic, re-render down to the drip bead, then finish between the lead and roof in the usual way?

 

[Zebra]

Re-read the whole thread properly, and yes, I think some rendering dripbead is what you want.

 

[kreyszig]

Thanks for the suggestion, I'll take a look (not too render clued up I'm afraid)