Our facility houses six large gas-fired kilns. Because the product can vary in volume from piece to piece, Boston Valley has the capability to customize our hearth structure when needed. This allows us to provide such a wide range of custom shapes, with depths that vary from as thin as 5/8″ for Guastavino tiles, all the way up to 4-foot wide masonry units. As with any ceramic product, terra cotta units demonstrate a color range when fired because of the small differences in temperature from the top to bottom and left to right of the kiln. These variations are inherent to this natural material formed of substances mined from the earth, adding to the beauty of the finished product.