On 16/08/18 19:20, Robin wrote:

The Victorian houses around here were build 125+ years ago for working
men and their families.Â* The slates used weren't of the quality you'd
expect to find on a Gentleman's London residence[1].Â* After 125+ years a
large proportion of most which remain are delaminating, cracked, have
enlarged nail holes etc. I saw how many slates were sold on for re-use
when our roof was replaced c10 years ago.Â* It was a quarter at most.

125 years? I'd call that pretty damn good for a roofing material!!!