Is Natural Slate on Dormer Cheeks on Loft Extension OK?

[js001]

We have just recently had a loft extension done. The builders were not great and we are glad to see the back of them!

However we are now worried that they have used to wrong materials for the dormer cheeks and front. My neighbor had a leak in his roof and a roofer came to look. When he was here he commented on our dormer saying that natural slates are not allowed to be used on the dormer as they are hanging vertically?

I am hoping this is not true and cannot find anything on the Internet saying that slates are no allowed. But I am worried that when we come to sell the house it would be picked up as an issue!

Does anybody know if natural slate is ok to be used for vertical dormer cheeks and the front? If so could you point me to the relevant standards document so I can sleep at night?! I'd rather have this information before I get back in contact with the builders. Thanks!

 

[catlad]

Yes they can there are thousands built like it.

 

[tony1851]

As above, loads of dormers have natural slate on the cheeks, and there is no
authority to say it should not be used.
It has to be carefully weathered with lead at the external corners, though, as this can be a weak spot.
It also does not look very attractive, as the slates are too big and can give a 'boxy' appearance to the dormer.
Better to use concrete plain tile IMO.

 

[Alastairreid]

natural slates are not allowed to be used on the dormer as they are hanging vertically?

clicky

 

[js001]

Thanks all - you have helped put my mind at ease!