Ardoises

[Peterh]

I am in the process of recovering a roof in Spanish Slates described as "1erchoix".  A number of slates were broken and others broke in my hands.  As a precaution I have been lightly twisting slates before putting them on the roof and a large proportion (10% - 15%) have broken due to inherrent weekness.

 

I have two questions.  Namely, is it usual to expect a percentage to be broken and could I expect these to be replaced and, secondly, is it reasonable to subject slates to minor pressure prior to use?

 

I would add that I have bought these slates through a reputable builders merchants.  I would be grateful for any advice that can be offered.

 

Many Thanks,

 

Peter