(A) Portland cement mortar used in laying up masonry shall be mixed in the proportion of one part of portland cement to not more than three parts of sand by volume.
(B) Hydrated lime or lime putty may be added not to exceed 15% by volume of the portland cement used.
(C) Cement-lime mortar shall be mixed in the proportion of one part of hydrated lime or lime putty to not more than six parts of sand by volume.
(D) Lime mortar shall be mixed in the proportion of one part of portland cement added to the amount of 15% of the volume of the lime.
('72 Code, § 151.027) Penalty, see § 10.99