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PostPosted: Fri Mar 15, 2019 9:22 am 
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I've been reading and looking at pics this morning and I'm still not clear. Sorry to be so thick!

Would someone mind explaining in basic terms what an undercloak is, or better still linking me to a good photo or diagram?

Even better still, here's a photo of my house... If anyone can explain what part the undercloak is or edit the photo to show me, that would be amazingly helpful.

Many thanks

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14 Undercloak.JPG
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PostPosted: Fri Mar 15, 2019 9:39 am 
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The undercloak overhangs the gable wall under the tiles, it's usually made of Asbestolux (don't panic) or maybe just some type of cement board these days. It's sheet material about 6mm thick but you can buy it ready cut in strips.

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PostPosted: Fri Mar 15, 2019 10:42 am 
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Perfect, thanks ajay.

So what's the name of the part above the undercloak but below the tiles? Up until now I thought that was the undercloak so I'm glad I asked!


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PostPosted: Fri Mar 15, 2019 1:49 pm 
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Between the undercloak and the tiles is just a sand and cement mix.

I don't really know if that qualifies as a part of the undercloak, but if you went to a builders merchant and asked for undercloak you'd get the strips of board, not a bag of sand and cement.

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PostPosted: Fri Mar 15, 2019 2:04 pm 
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Thanks, that's all really helpful. I thought the sand and cement mix was the undercloak! I'm going to get some bits tested for asbestos in the house and thought I might as well get this done as well. It's only an extra fiver, so worth doing now I think for if/when work needs to be done. At least the correct part will be tested now!!!

Here's what the actual survey said:

"The concrete tiles have a cement pointed undercloak to gable ends. The undercloak is a cement board which may contain asbestos. The cement pointing is cracked and porous. You should carry out repairs soon. If you delay, the risk of timber decay and slipped tiles will increase."


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PostPosted: Fri Mar 15, 2019 5:11 pm 
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The sand/cement mix is part of the verge.


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PostPosted: Fri Mar 15, 2019 5:11 pm 
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What you thought was the "undercloak" is commonly called the "verge", There won't be any asbestos in there ...

You might want to look at a dry verge system, maintenance free.

EDIT beaten to it by Cotswold, It's been a long time since that happened. :wink:

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For this message the author wine~o has received gratitude : cotswold builders
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PostPosted: Fri Mar 15, 2019 6:31 pm 
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Ok, yep I'll take a look at dry verge systems. Thanks for the tip. So the "cement pointing" the surveyor mentions is the verge, and would you guys agree that it needs sorting asap?

I'll see about getting a sample of the undercloak boost tested for asbestos seeing as I'm having other samples from inside the house tested. Now that I finally know what it is :)

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PostPosted: Fri Mar 15, 2019 6:51 pm 
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Verges appear to have some cracks, needs either hacking off and re-doing or dry verge. Not urgently but "some time soon"

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PostPosted: Fri Mar 15, 2019 7:26 pm 
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Great, thank you.

So with either type of repair (re-cement or dry verge system), would I need to redo both the verge and undercloak or just the verge?

And can either/both types of repair be done without disturbing the tiles, or will some tiles need to come off?

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PostPosted: Fri Mar 15, 2019 7:36 pm 
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If you can carefully dig the sand & cement verge out without disturbing either the slates or the undercloak, you can just remake it. Use a dry-ish mix and pack it in.

Whilst, as this thread started, an undercloak is very often cementitious asbestos under clay tiles, it does not have to be.

Other flat rigid matetial may be used, and as OP is in Wales, it could be slate. The rest of the roof is, so it would make sense for the roofer to make use of what he had to hand at the time.

OP ought to have a closer look.


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PostPosted: Fri Mar 15, 2019 7:44 pm 
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I'll do my best :)

Although I should point out that the tiles on that roof are concrete. They just can't be seen from the angle of the photo...


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PostPosted: Fri Mar 15, 2019 8:29 pm 
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I'm trying to upload a photo of the roof but not having much luck at the moment. Will try again later...


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PostPosted: Fri Mar 15, 2019 8:37 pm 
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udaman wrote:
I should point out that the tiles on that roof are concrete. They just can't be seen from the angle of the photo...


Yet the cow shed is slate? Weird.


Last edited by arco_iris on Fri Mar 15, 2019 9:17 pm, edited 1 time in total.

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PostPosted: Fri Mar 15, 2019 8:55 pm 
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Fitting dry verge properly need the tiles stripping and battens extended, you can spot the ones that have been siliconed on.
Dry verge will never look right, discolours quickly.
You can't beat a good sand/cement verge, done properly which is lifting the edges tiles and bedding them down on a full bed of mortar, pointed up when setting will last for years.


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