Green Building Forum - How tightly should lead flashing be dressed to a NOT flat old stone wall? Tue, 19 Dec 2023 07:06:48 +0000 http://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303224#Comment_303224 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303224#Comment_303224 Tue, 12 Sep 2023 21:01:00 +0100 greenfinger
I've finished installed soakers to my slate roof at a wall abutment, and I've cut the chase above ready for the flashing. The chase isn't mega straight, especially the bottom line This is mostly due to bits of stone and mortar falling away. And partly lack of skill ;) On top of that, the vertical bit of wall that will be behind the flashing undulates and is anything but flat.

I've dressed the soaker upstands tight to the wall. Should I do the same with the flashing or does it not need to be dressed so tightly?

Also, I was planning to keep the bottom of the flashing about 10mm above the slates. The upstand would then be around 115mm, with 35mm tucked into the chase. Where the chase is lower than 115mm, does it matter? IE - with the lead at 115mm upstand, but the bottom line of the chase only 100mm, there will be a small void behind the lead. Is that ok as is? Or should I look to pack it somehow?

I hope this all makes sense! It's been a long day. I'll try and add some photos shortly.

Any advice much appreciated.



Many thanks]]> How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303226#Comment_303226 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303226#Comment_303226 Tue, 12 Sep 2023 22:03:40 +0100 tony How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303232#Comment_303232 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303232#Comment_303232 Tue, 12 Sep 2023 23:45:10 +0100 greenfinger
Yes, I did angle the cut as you suggest. As for pointing, I was actually planning to use Lead Mate or similar rather than point. I read that it is better because it is more flexible?

Posted By: tonyI like the bend where it turns over into the wall to be fully supported


What would you suggest I use to give it support behind the lower sections?

Photos to be added in a mo.

Many thanks for your help]]> How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303233#Comment_303233 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303233#Comment_303233 Tue, 12 Sep 2023 23:52:12 +0100 greenfinger How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303234#Comment_303234 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303234#Comment_303234 Tue, 12 Sep 2023 23:52:49 +0100 greenfinger How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303235#Comment_303235 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303235#Comment_303235 Tue, 12 Sep 2023 23:53:04 +0100 greenfinger How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303236#Comment_303236 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303236#Comment_303236 Tue, 12 Sep 2023 23:53:22 +0100 greenfinger How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303237#Comment_303237 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303237#Comment_303237 Tue, 12 Sep 2023 23:53:37 +0100 greenfinger How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303238#Comment_303238 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303238#Comment_303238 Wed, 13 Sep 2023 00:30:47 +0100 greenfinger How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303239#Comment_303239 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303239#Comment_303239 Wed, 13 Sep 2023 07:20:02 +0100 philedge How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303241#Comment_303241 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303241#Comment_303241 Wed, 13 Sep 2023 09:35:37 +0100 greenfinger Posted By: philedgeI'm not expert but that looks good work so far

Thanks for the vote of confidence :) I posted on another forum where the advice was to recut the top line and mortar up the bottom.

So I'm currently deciding what to do best, although in all honesty I'd much prefer to not recut it, for various reasons.

Any further thoughts much appreciated on my original post and/or whether anyone thinks it needs recutting...

Cheers]]> How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303242#Comment_303242 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303242#Comment_303242 Wed, 13 Sep 2023 09:52:20 +0100 Dominic Cooney How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303243#Comment_303243 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303243#Comment_303243 Wed, 13 Sep 2023 09:56:06 +0100 Dominic Cooney How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303244#Comment_303244 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303244#Comment_303244 Wed, 13 Sep 2023 10:10:02 +0100 greenfinger
Thanks for the tip RE the StormDry. We removed a roughcast concrete render last year, along with all the sand/cement mortar which we replaced with lime (still got some to finish). So we're going down the breathable wall route and wouldn't want to add anything to impede that. However, unlike you, this wall is on the opposite side of the house that sees most of the weather. It's quite sheltered. And before it started work it just had a crude flashing cemented to the render and bent over the top of the slates, with no soakers or anything beneath. SO regardless I think this will be a big improvement.

Thanks again]]> How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303245#Comment_303245 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303245#Comment_303245 Wed, 13 Sep 2023 10:38:10 +0100 fostertom
Isn't Stormdry or similar supposed to prevent liquid absorbtion but not impede vapour traffic in or out? I've always been dubious but wd appreciate words of wisdom and experience or whether this is an OK practice.]]> How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303246#Comment_303246 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303246#Comment_303246 Wed, 13 Sep 2023 10:55:13 +0100 greenfinger
Stormdry does say it's breathable in the product blurb (just had a quick look). But there are also forum posts discussing the merits of it and how breathable breathable actually means?!? Here's one for starters:

https://www.periodproperty.co.uk/forum/threads/stormdry-brick-waterproofer-any-thoughts.14516/


Thanks again]]> How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303248#Comment_303248 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303248#Comment_303248 Wed, 13 Sep 2023 11:55:07 +0100 djh How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303250#Comment_303250 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303250#Comment_303250 Wed, 13 Sep 2023 14:01:45 +0100 fostertom How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303254#Comment_303254 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303254#Comment_303254 Wed, 13 Sep 2023 15:43:14 +0100 GreenPaddy
Butter the lower cut edge with mortar, to give the lead some support as you press it home.

Tap in the fixings (I use folded lead off cuts, but clips are avail I believe)

Fill gap with lead mate.]]> How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303255#Comment_303255 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303255#Comment_303255 Wed, 13 Sep 2023 16:23:40 +0100 djh Posted By: fostertomWot, just naked lime plaster + Stormdry? That's interesting.There's clay paint on the lime and then the Stormdry, FWIW. It only gets drops of water on it and they bead up and run off.]]> How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303265#Comment_303265 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303265#Comment_303265 Thu, 14 Sep 2023 07:06:35 +0100 Dominic Cooney How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303372#Comment_303372 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303372#Comment_303372 Mon, 18 Sep 2023 14:44:41 +0100 lineweight How tightly should lead flashing be dressed to a NOT flat old stone wall? http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303394#Comment_303394 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17949&Focus=303394#Comment_303394 Mon, 18 Sep 2023 22:43:33 +0100 tony