In 1995, we used Tegola copper-clad bitumen shingles on the cupolas of our new, architectural award-winning church in San Francisco. We've been very pleased with them from the beginning. As you know, they age beautifully. I have a small project of a tea house in our garden that I'd like to roof with the same material. The roof is 180 square feet (approximately 20 square meters). I'm looking for a supplier in California from whom to buy the same Tegola copper-clad shingles. (the project is in San Francisco - U.S. zip code 94107).