Stairs. Wood firing is the most ancient way of firing ceramic pottery and tile. This manufacturer has been firing wood kilns for almost 40 years. The kilns fire to temps upwards of 2500 degrees, taking almost 36 hours to reach these temps. This creating a "high fired" tile that is vitreous and frost proof. Strong and durable for use indoors and out, kitchens, baths, fireplace surrounds, outdoor kitchens and swimming pools, just to name a few unique uses.