■ No exposure to rainwater
Construction of an interior chimney is no different from other types of interior masonry. Since the elements will not be in contact with rainwater, lime mortars can be used, but are not necessary.
Since it takes less energy to manufacture lime than Portland Cement, it is always preferred from an environmental standpoint, to use a lime mortar.
TYPE OF MORTAR RECOMMENDED: TYPE N
■ Mortar recommended: King® 1-1-6 or King® MasonGo 100