We have just had reclaimed slate laid on a new extension, roofers coming back today (yikes!) to finish off. We are slightly concerned as there is a lot of uneveness, different thicknesses and beaten up edges (I presume this is normal with reclaimed materials?) but more worryingly, some of the slates are cracked. Should we raise this or will it be okay? Is that normal for reclaimed slate? Any advice gratefully received - and quick advice would be much appreciated. We'll only have the roofers here for another hour or so today. Thanks.