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Re: Flashing and weep holes.
To my knowledge, it's always been required.
This is from the 1994 Standard Building Code (SBCCI). (bold and underlining is mine)
- B1403 VENEERED WALLS
- - B1403.1 GENERAL
- - - B1403.1.1 Veneer refers to a facing of brick, tile, concrete, masonry units, metal, including metal coated with porcelain enamel, glass, wood or similar material securely attached to a wall for the purpose of providing ornamentation, protection, or insulation but not so bonded as to exert a common reaction under load.
- - - B1403.1.2 Veneer shall not be assumed to support any load other than its own weight, neither shall it be assumed to add to the strength of the wall.
- - - B1403.1.3 Veneered walls shall provide weather protection for the building at the walls.
- - - B1403.1.4 Flashing shall be provided as necessary to prevent the entrance of water at openings in or projections through veneered walls. Flashing shall be provided at intersections of veneered walls of different materials unless such materials provide a self-flashing joint and at other points subject to the entrance of water. Caulking shall be provided where such flashing is determined by the building official to be impractical.
- - - - B1403.1.4.1 Flashing and weepholes as outlined in B2111.1.3 shall be located in the first course of masonry above finished ground level above the foundation wall or slab, and other points of support, including structural floors, shelf angles and lintels when anchored veneers are designed in accordance with B1403.2.4, B1403.2.5 and B1403.2.6.
B2111.1.3 WEEPHOLES. Weepholes shall be provided in masonry veneer and in the outside wythe of masonry walls at a maximum spacing of 4 ft (1219 mm) on center by omitting mortar in the head joints. Weepholes shall be located in the first course above the foundation wall or slab, and other points of support, including structural floors, shelf angles, and lintels.
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