Continental drift and the art of choosing slate

What’s the connection between Canadian slate mines and Snowdonia National Park in Wales? The answer is that 500 million years ago, before continental drift formed the Atlantic Ocean, they were in much the same place.

What has this got to do with extending a Grade II listed house, you may well ask? Quite a lot, it turned out: by last week we had obtained all the listed building consents required before breaking ground on the extension foundations, bar one; the remaining condition was the source of the roofing slate. The strong preference of our local authority was for Welsh slate, because that was what used to be used in East Anglia. Our request to use Spanish slate did not go down well. Continue reading “Continental drift and the art of choosing slate”