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Chapter 21: Masonry
Section BC 2101: General
Section BC 2102: Definitions and Notations
Section BC 2103: Masonry Construction Materials
2103.1 Masonry units.
2103.1.1 Second-hand units.
2103.2 Mortar.
2103.2.1 Masonry mortar.
2103.2.2 Surface-bonding mortar.
2103.2.3 Mortars for ceramic wall and floor tile.
2103.2.3.1 Dry-set portland cement mortars.
2103.2.3.2 Latex-modified portland cement mortar.
2103.2.3.3 Epoxy mortar.
2103.2.3.4 Furan mortar and grout.
2103.2.3.5 Modified epoxy-emulsion mortar and grout.
2103.2.3.6 Organic adhesives.
2103.2.3.7 Portland cement grouts.
2103.2.4 Mortar for adhered masonry veneer.
2103.3 Grout.
2103.4 Metal reinforcement and accessories.
Section BC 2104: Construction
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Section BC 2107: Allowable Stress Design
Section BC 2108: Strength Design of Masonry
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Section BC 2111: Masonry Fireplaces
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Section BC 2113: Masonry Chimneys
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2103.1.1 Second-hand units.
Second-hand masonry units shall not be reused unless they conform to the requirements of new units. The units shall be of whole, sound materials and free from cracks and other defects that will interfere with proper laying or use. Old mortar shall be cleaned from the unit before reuse.
   Exception: Second-hand masonry units need not conform to the requirements for new units when their reuse is to comply with historic restoration standards or requirements of the New York City Landmarks Preservation Commission or the New York State Historic Preservation Office.
2103.2 Mortar.
Mortar for masonry construction shall comply with Section 2103.2.1, 2103.2.2, 2103.2.3 or 2103.2.4.
2103.2.1 Masonry mortar.
Mortar for use in masonry construction shall conform to Articles 2.1 and 2.6A of TMS 602.
2103.2.2 Surface-bonding mortar.
Surface-bonding mortar shall comply with ASTM C 887. Surface bonding of concrete masonry units shall comply with ASTM C 946.
2103.2.3 Mortars for ceramic wall and floor tile.
Portland cement mortars for installing ceramic wall and floor tile shall comply with ANSI A108.1A and ANSI A108.1B and be of the compositions indicated in Table 2103.2.3.
Table 2103.2.3
Ceramic Title Mortar Compositions
 
Location
Mortar 
Composition 
Walls
Scratchcoat
1 cement; 1/5 hydrated lime; 4 dry or 5 damp sand
Setting bed and leveling coat
1 cement; 1/2 hydrated lime; 5 damp sand to 1 cement 1 hydrated lime, 7 damp sand
Floors
Setting bed
1 cement; 1/10 hydrated lime; 5 dry or 6 damp sand; or 1 cement; 5 dry or 6 damp sand
Ceilings
Scratchcoat and sand bed
1 cement; 1/2 hydrated lime; 2 1/2 dry sand or 3 damp sand
 

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