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Masonry veneer support


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I just inspected a new home where the masonry veneer on one of the larger walls hangs over the poured foundation by 1 1/4" with a 3" brick. I have always heard 1/3 of the width is acceptable; however, I am not able to find any reference for this. The closest I can find is

2003 IRC R703.7.2.1 Support by Steel Angle: A minimum 6 inches by 4 inches by 5/16 inch (152 mm by 102 mm by 8 mm) steel angle, with the long leg placed vertically, shall be anchored to double 2 inches by 4 inches (51 mm by 102 mm) wood studs at a maximum on center spacing of 16 inches (406 mm). Anchorage of the steel angle at every double stud spacing shall be a minimum of two 7/16 inch (11.1 mm) diameter by 4 inches (102 mm) lag screws. The steel angle shall have a minimum clearance to underlying construction of 1/16 inch (1.6 mm). A minimum of two-thirds the width of the masonry veneer thickness shall bear on the steel angle. Flashing and weep holes shall be located in the masonry veneer wythe in accordance with Figure R703.7.1. The maximum height of masonry veneer above the steel angle support shall be 12 feet, 8 inches (3861 mm). The air space separating the masonry veneer from the wood backing shall be in accordance with R703.7.4 and R703.7.4.2. The method of support for the masonry veneer on wood construction shall be constructed in accordance with Figure R703.7.2.1. The maximum slope of the roof construction without stops shall be 7:12. Roof construction with slopes greater than 7:12 but not more than 12:12 shall have stops of a minimum 3 inches x 3 inches x ? inch (76 mm x 76 mm x 6 mm) steel plate welded to the angle at 24 inches (610 mm) on center along the angle or as approved by the building official.

Therefore, anyone have a better reference?

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Try Brick Industry Association Technical Note 28.

www.gobrick.com/TechnicalNotes/LinkstoT ... fault.aspx

Specifically:

Foundations for Brick Veneer

Brick veneer with wood frame backing must transfer the weight of the veneer through the veneer to the foundation. Typical foundation details for brick veneer are shown in Fig. 2. It is recommended that the foundation or foundation wall supporting the brick veneer be at least equal to the total thickness of the brick veneer wall assembly. Many building codes permit a nominal 8 in. (200 mm) foundation wall under single-family dwellings constructed of brick veneer, provided the top of the foundation wall is corbeled as shown in Fig. 2©. The total projection of the corbel should not exceed 2 in. (50 mm) with individual courses projecting beyond the course below not more than one-third the thickness of the unit nor one-half the height of the unit. The top course of the corbel should not be higher than the bottom of the floor joist and shall be a full header course.

This is from technical note #28 of Steve's link.

Marc

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