Any idea what these roof tiles are

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Says rd858475 on the back, need to buy a load of new ones for my extension to interlock with existing
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Cheers. Why? They do seem a bit dodgy on the interlock
 
They are just reluctant to seat nicely with their single nib and silly shape. Easy to get out of shape with them too.
 
Thanks noseall, I can understand that just by looking at them. Oh well another learning curve for me :)
 
I'll have to do an extension roof in these in a couple of months too, 23vc, so we can form a support group on Facebook if you like.

They are just reluctant to seat nicely with their single nib and silly shape. Easy to get out of shape with them too.

Would I be mad to use them with a dry valley with a 100mm upstand?
 
Dry valley - no.
Mortared valley - insane.

Thanks - that's reassuring. Are there challenges with the non-existence of a tile-and-a-half in terms of getting any tiny cuts supported, or would you use clips for those?
 
Thanks - that's reassuring. Are there challenges with the non-existence of a tile-and-a-half in terms of getting any tiny cuts supported, or would you use clips for those?
Sometimes its better to use a larger piece of tile for the smaller cuts, with the majority of the tile being hidden by the one above. In other words it won't be sitting on the batten it will be seated against the valley with the uppermost part appearing to be shoved up.
 
No valleys for me Gary thank god. Does anyone have any idea what the allowance is for the thickness of these tiles including a 25mm batten from the top of the rafter? I was working on about 100mm, as I've got another roof of the same pitch sitting below it and I need to allow enough room for a verge flashed down to the lower roof
 
No valleys for me Gary thank god. Does anyone have any idea what the allowance is for the thickness of these tiles including a 25mm batten from the top of the rafter? I was working on about 100mm, as I've got another roof of the same pitch sitting below it and I need to allow enough room for a verge flashed down to the lower roof
Sounds about right.
It will be greater than 75mm in any case. Are there any existing verges you can measure?
 
Thanks noseall, yes I measured an existing one and kind of averaged it out to about that figure
Sorry to keep hijacking this thread but still on the topic of these lovely tiles, can I keep an existing dry verge (or fit a new one) with lead coming out from underneath it dressed down onto my new lower roof, or does that kind of arrangement need a mortared cloaked verge? I can't see why it should be a problem but don't recall seeing any done that way. There would be a barge board coming out from beneath the dry verge and the lead would be behind it (or possibly in front of it?)
Both roofs run at same pitch, the new one is set back below by about 200mm
 
Mine seem to be 50mm deep profile when measured from the batten seat, so with a 25mm batten that'd be 75mm measured perpendicular to the rafter. If you translate that to vertical on a 45 degree roof them I'd guess you're looking at more like 100mm?
 

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