Lauzes / Ardoises???

[Hev&Jon]

Hi Everyone,

I'm renovating a house in the Aveyron (12).  Most of the roofs here are tiled with either lauzes or ardoises (especially old houses like mine).  Can anybody give me any info regarding lauzes and ardoises, eg. where's the best place to buy them, do they come pre-cut, how do you fix them, what are the differences between the two etc?

Any info would be much appreciated.

Best regards,

Jon.