Slate roof - Tile roof.. acceptable method of joining?

alo

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Jul 18, 2013, 7:33:40 AM7/18/13

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Here is the problem....

Semi detached house, both properties sharing he same type of slate
roof.

One house now has had their roof re-done. New battens, felt and the
original slates replaced with tiles.

Now the problems is.. how should the two different roofing areas meet?
From the ground view it appears that the original slates are at a
lower level than the tiles, but instead of the tiles overlapping the
slates, the opposite has taken place.

The slates have now been prised up to go over the tiles, so the run of
slates as they approach the tiles gradually rise up like a ski slope
to meet the thicker and higher tiles.

From the ground it is not possible to see what, if anything, has been
used to seal the joining. The worry is that the slates have been
disturbed, and the original nailing holding slates to old battens have
been weakened.

Looking at other properties with similar different roofing material
there seems to be a variety of joing styles... but none that looks
like the roof we have.

What is best practise in a situation like this?

Thanks

Tim+

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Jul 18, 2013, 8:13:27 AM7/18/13

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alo <a...@btinternet.com> wrote:

> What is best practise in a situation like this?

Set fire to your neighbours house and insist that the insurance company
replaces the roof with a proper slate one. ;-)

I appreciate that it's a bit "iffy" trying to burn just half of a semi.

Just out of interest, were you consulted? I'd be furious if I lived in a
semi and and my neighbour did this. Roofs that were designed for slates
just don't look right with tiles. Spoils the whole look of the house IMO.
I take it that there are no local planning restrictions that could have
been applied to prevent this?

Whatever the rights and wrongs of changing the roof covering I would think
that the onus for ensuring a watertight join lies with your neighbour. I
would look for similar properties in the same situation as yours and see
what's been done there. If you're not happy, it might be worth getting in
touch with your local building control officer.

Tim

Tim+

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Jul 18, 2013, 8:22:27 AM7/18/13

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Tim+ <timdow...@nospampleaseyahoo.co.uk> wrote:
> alo <a...@btinternet.com> wrote:
>
>> What is best practise in a situation like this?

> Whatever the rights and wrongs of changing the roof covering I would think
> that the onus for ensuring a watertight join lies with your neighbour. I
> would look for similar properties in the same situation as yours and see
> what's been done there. If you're not happy, it might be worth getting in
> touch with your local building control officer.
>
> Tim

Second last question in is FAQ may be helpful.

http://www.sandtoft.com/technical-support/design-advice/faq/?FAQCat=General&subimt=Go

Tim

RayL12

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Jul 18, 2013, 10:56:24 AM7/18/13

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Jeez, that will look ugly. The cleanest looking and most effective
method is a concealed bonding gutter.

http://www.hambleside-danelaw.co.uk/roofing-ventilation/products/bonding-gutters/bonding-gutter-hdlbg.php

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alan

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Jul 18, 2013, 11:41:41 AM7/18/13

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On 18/07/2013 12:33, alo wrote:
> Here is the problem....
>
> Semi detached house, both properties sharing he same type of slate
> roof.
>
> One house now has had their roof re-done. New battens, felt and the
> original slates replaced with tiles.
>
> Now the problems is.. how should the two different roofing areas meet?
> From the ground view it appears that the original slates are at a
> lower level than the tiles, but instead of the tiles overlapping the
> slates, the opposite has taken place.

My roofer used a hidden gutter. It runs under my tiles and under the
neighbour's slates. The slates have straight edge, the tiles have a
straight edge with a one inch gap between the two

<http://www.hambleside-danelaw.co.uk/roofing-ventilation/products/bonding-gutters/bonding-gutter-hdlbg.php>

http://tinyurl.com/nrm9rnd

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Phil L

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Jul 18, 2013, 12:12:13 PM7/18/13

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alo wrote:
> Here is the problem....
>
> Semi detached house, both properties sharing he same type of slate
> roof.
>
> One house now has had their roof re-done. New battens, felt and the
> original slates replaced with tiles.
>
> Now the problems is.. how should the two different roofing areas meet?
> From the ground view it appears that the original slates are at a
> lower level than the tiles, but instead of the tiles overlapping the
> slates, the opposite has taken place.

they've probably used a bonding gutter as mentioned in earlier replies, this
isn't normally visible from down below

>
> The slates have now been prised up to go over the tiles, so the run of
> slates as they approach the tiles gradually rise up like a ski slope
> to meet the thicker and higher tiles.
>

That's not good

> From the ground it is not possible to see what, if anything, has been
> used to seal the joining. The worry is that the slates have been
> disturbed, and the original nailing holding slates to old battens have
> been weakened.
>
> Looking at other properties with similar different roofing material
> there seems to be a variety of joing styles... but none that looks
> like the roof we have.
>
> What is best practise in a situation like this?

If they've used a bonding gutter, which it sounds like they have, they've
not seated it correctly, or the party wall it's sat on is sloped to the left
or right and they've not levellled it up first.
With a bonding gutter, there's supposed to be a gap between roof materials,
that's why there's a sanded strip down the middle of it - to allow mortar
adhesion under the tiles and slates

Dave Liquorice

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Jul 18, 2013, 3:22:17 PM7/18/13

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On Thu, 18 Jul 2013 12:33:40 +0100, alo wrote:

> One house now has had their roof re-done. New battens, felt and the
> original slates replaced with tiles.

What you describe really does sound like a bodge of the first order.
Also along the bodge lines did they strengthen the roof at all or
just replace the battens and sarking? Tiles weigh considerably more
than slates per unit area...

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Dave.

Phil L

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Jul 19, 2013, 2:30:47 PM7/19/13

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I know dozens of roofers and I've never known any of them to strengthen roof
timbers, also, if any roofer was to price this into their quotes, they would
never work again, mainly because it's a con and it's not required.

alo

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Jul 20, 2013, 5:20:02 AM7/20/13

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On Thu, 18 Jul 2013 13:13:27 +0100, Tim+
<timdow...@nospampleaseyahoo.co.uk> wrote:

>alo <a...@btinternet.com> wrote:
>
>> What is best practise in a situation like this?

>

>Whatever the rights and wrongs of changing the roof covering I would think
>that the onus for ensuring a watertight join lies with your neighbour. I
>would look for similar properties in the same situation as yours and see
>what's been done there. If you're not happy, it might be worth getting in
>touch with your local building control officer.
>
>Tim

Tim..
Does the local building inspector have a remit to inspect and allow
(or not allow) roofing jobs, as in the example above?

Thanks

Tim Watts

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Jul 20, 2013, 5:37:38 AM7/20/13

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Absolutely he does.

On 2 counts at least:

1) Structure;

2) Thermal element if any insulation owrk is being done.

Reroofing is as far as I know, notifiable work.

You'd probably get away with not bothering if it were a like for like, but
if the covering materials is being changed, it should be notified.

I changed mine from plain to interlocking tiles. However, I was able to
demonstrate that the loading was reduced by doing so, so he was happy.

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