"Mr Macaw" wrote in message news
On Sun, 13 Mar 2016 21:40:29 -0000, DerbyBorn
wrote:

"Mr Macaw" wrote in news
http://www.clayandslateroofingproduc...ed-roof-tiles/

Just like that in Germany. They lookk clean and fresh. Moss wouldn't get
a
hold.

But how long does the glaze last?

Forever basically, just like it does with glazed wall tiles.