FireRock Systems LiteRock Model FireRock offers a simple way to build a high-end, all-masonry fireplace and chimney. This smartly designed system installs in a matter of hours for less than half the cost of a traditional brick and mortar fireplace. Not only does it look great, it lasts forever. About the LiteRock Model: Allows for a wood burning fireplace on any combustible floor system Great for remodeling projects or second floor fireplace applications Requires the use of an approved metal chimney