FireRock Fireplaces offer a pre-engineered modular masonry system. Stunning Looks better and lasts longer than a "metal box" fireplace. Firerock is UL 127 compliant. Strong 3000 PSI compressive strength. The strongest on the market. Long lasting, all models come with a 20 year warranty and a 100 year life expectancy. Smart: Costs 50% less than traditional brick & mortar, and is precision...