Installed on this barn roof were slate tiles manufactored by Greenstone Slate in Poultney, Vermont. Customer chose the color called Greenstone. The tiles are between 3/8"-1/2" thick. Also installed were snowguards that were staggered in two rows along the bottom roof line. Customer was very pleased with the new roof and it's look. Slate tiles are very durable and known to last for over a 100+ years.