Parapet leadwork above bay window

[xeres]

Hi.

Looking for some technical input - had a leadwork undertaken on an 1860s Victorian terraced bay window parapet roof. It comprises of a welded gully, flat roof section and flashings.

I’ve a number of issues with the finish and would welcome experienced users comments on these pics.

The first is a tear in the flat roof section where it folds into the welded gully. Sorry, pic is rotated 90 degrees! Will try and correct that - the tear is on the drip edge fold into the gulley.

The second demonstrates missing sealant and you can see insufficient 25mm depth of lead into the wall chase.

The third is the corner junction of the gully, flat roof and flashings coming over. The flat sheet has been cut/torn to fold around the area.

I can only see 1 lead chock per metre or thereabouts. He rammed them in using a bolster chisel, I’m concerned thinning the lead at these points. (H wasn’t using clips). How many should there be on runs where the lead is sealed using a lead suitable mastic sealant.

If anyone can link me to a technical document which explains this stuff I’d be appreciated - not sure where to look. I know this stuff having read myself - but need a technical document to make my arguments with them.

 

[xeres]

Hi.

Looking for some technical input - had a leadwork undertaken on an 1860s Victorian terraced bay window parapet roof. It comprises of a welded gully, flat roof section and flashings.

I’ve a number of issues with the finish and would welcome experienced users comments on these pics.

The first is a tear in the flat roof section where it folds into the welded gully. Sorry, pic is rotated 90 degrees! Will try and correct that - the tear is on the drip edge fold into the gulley.

The second demonstrates missing sealant and you can see insufficient 25mm depth of lead into the wall chase.

The third is the corner junction of the gully, flat roof and flashings coming over. The flat sheet has been cut/torn to fold around the area.

I can only see 1 lead chock per metre or thereabouts. He rammed them in using a bolster chisel, I’m concerned thinning the lead at these points. (H wasn’t using clips). How many should there be on runs where the lead is sealed using a lead suitable mastic sealant.

If anyone can link me to a technical document which explains this stuff I’d be appreciated - not sure where to look. I know this stuff having read myself - but need a technical document to make my arguments with them.

“The second demonstrates missing sealant and you can see insufficient 25mm depth of lead into the wall chase. “

You can also see an example lead chock on the right hand side of this picture. They’re oversize pieces rammed proud of these finish. Technical thoughts on this?

 

[xeres]

Also - on pic 3 you can see the flashings and flat sheet. The flat sheet is really shined and does t look like lead at all, although is reasonably soft and malleable like lead. Any idea what it is?

 

[datarebal]

not good. fyi use of lead wedges is perfectly fine.. if used correctly , most of your answers are here...

http://slateroofers.org/downloads/lead_flashing_guide.pdf

 

[bobasd]

plwase post pics of the whole bay showin far more from outside as well as inside the bay parapet.
you seem to have a mixture of v. old code 3 sheet lead alll ragged an holed an some newer stuff, maybe alternative lead sheet?

why notread the related threads below?
an google bay roof parapet flashin?