This section is from the book "The Building Code Of The City Of Boston", by City of Boston Building Department. Also available from Amazon: Building Code of the City of Boston.
Par. 1. - Every entrance hall in every tenement house hereafter erected shall be at least three feet six inches wide in the clear, from the entrance up to and including the stair inclosure, and beyond this point at least three feet wide in the clear, and shall comply with all the conditions of the preceding sections of this act as to the construction of stair halls, except that in a fireproof tenement house hereafter erected the entrance hall may be inclosed with terra-cotta blocks not less than four inches thick and angle-iron construction, instead of brick walls. If such entrance hall is the only entrance to more than one stairway, that portion of said hall between the entrance and the stairway shall be increased at least eighteen inches in width in every part for each additional stairway.
Par. 1. - In all tenement houses of the second or third class hereafter erected, except where the floor next above is first class construction, the cellar and basement ceiling shall be lathed with metal laths and plastered three coats of cement plaster.
[1921, c. 289, sect. 10.]
 
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