Masonry Magazine August 1980 Page. 18
Brick Veneer Installation
below grade, the space between the veneer and the existing construction should be completely filled with mortar or grout. Flashing should also be installed at the heads and sills of all openings, and wherever the air space is interrupted. The flashing should extend through the face of the brick veneer to form a drip. Where the flashing is not continuous, such as at heads and sills, the ends should be turned up approximately 1 in. (25 mm).
Weepholes should be located in the head joints immediately above all flashing. The maximum spacing of the weepholes should be 24 in. (600 mm) o.c. When wick materials are used in the weepholes or when the flashing does not extend through the face of the brick veneer, the spacing of the weepholes should not exceed 16 in. (400 mm) o.c. Additional discussion of flashing and weepholes may be found in Technical Notes 7 Series.
Movement Provisions
Provisions to accommodate differential movement due to temperature, moisture, shrinkage, and creep are not ordinarily required in small brick veneer buildings. For structures larger than single-family houses, the design should include considerations of potential differential movements and proper details to accommodate them.
Design and details for differential movement may include: expansion joints, flexible anchorage, joint reinforcement, bond breaks, and sealants. These items and their applications are discussed in Technical Notes 18 Series, 28 Revised and 21 Series.
Framing Around Openings
Typical lintel, jamb, and sill details are shown in Fig. 3. New brick sills can usually be constructed so that the existing sill overlaps the new brick sill.
New moulding installed at the existing jambs and heads of openings should extend the framing enough so that the air space between the brick veneer and the existing construction can be properly sealed.