With new home construction declining in many areas, re-siding homes with brick veneer may bring masonry contractors more business. HOW'S IT DONE? Most often, new brick veneer is applied over existing siding, usually wood-frame construction. A wythe of nominal 4-inch-thick brick is anchored with metal ties so there's an inch of air space between the old and new construction. No single method, however, is right for re-siding every house. Methods vary with the type of existing construction and the characteristics of each house. STARTING WITH A GOOD FOUNDATION The most common way to support brick re-siding is to attach a continuous 3/8-inch steel angle to the existing foundation or basement wall. The steel angles should conform to ASTM A 36 and be corrosion-resistant, as should be the bolts and other fasteners. CHOOSING THE RIGHT MATERIALS Use Grade SW (severe weathering) brick, in accordance with ASTM C 62 or ASTM C 216. In general, Type N mortar is preferred for brick veneer. ATTACHING THE NEW WALL To attach brick veneer to existing wood-frame backup, use corrugated 22-gauge metal ties at least 7/8-inch wide and 6 inches long. KEEPING WATER OUT Take extra care to keep moisture from penetrating the wall. To conduct any moisture that enters the wall back to the exterior, install flashing and weep holes at the heads and sills of all openings, and wherever the air space is interrupted.