Masonry Veneer

If masonry veneer is used for the exterior cladding of above-grade walls, the foundation must include a supporting ledge or offset wide enough to allow a space of about i in. (25 mm) between the masonry and the sheathing paper (Fig. 84).

A base flashing should extend from the outside face of the wall over the top of the ledge and at least 6 in. (150 mm) up the wall behind the sheathing paper. Corrosion-resistant metal ties, nailed to the studs and embedded in the mortar joints between the masonry, should be used to tie the veneer to the framework. When fastened to every other stud these are usually spaced 32 in. (800 mm) apart horizontally and 16 in. (400

mm) vertically. Alternatively when fastened to every stud, they may be spaced 24 in. (600 mm) horizontally and 20 in. (500 mm) vertically, or 16 in. (400 mm) horizontally and 24 in. (600 mm) vertically, depending on the stud spacing.

Weep holes serve both a venting and a drainage function. They should be placed about 32 in. (800 mm) apart in the bottom course of the masonry veneer and above-grade windows and doors. This can be done by omitting the mortar from the vertical joints.

Masonry veneer should be at least 31/2 in. (90 mm) thick where there are raked joints and 2 3/4 In. (75 mm) thick where the joints are unraked.

If a brick veneer is used, the bricks selected should be hard, absorb

Ledge in foundation wall for support of brick veneer or other masonry finish.

wall stud wall sheathing insulation bottom plate subfloor floor joist header joist sill plate anchor bolt foundation

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Ledge in foundation wall for support of brick veneer or other masonry finish.

wall stud wall sheathing insulation bottom plate subfloor floor joist header joist sill plate anchor bolt foundation

Brick Tied Sheathing

sheathing membrane 4" (100 mm) lap minimum

1" (25 mm) min. airspace behind brick veneer brick tie nailed through sheathing to stud weep hole every 32" (800 mm) maximum finish grade flashing extended up wall 6" (150 mm)

sheathing membrane 4" (100 mm) lap minimum

1" (25 mm) min. airspace behind brick veneer brick tie nailed through sheathing to stud weep hole every 32" (800 mm) maximum finish grade flashing extended up wall 6" (150 mm)

little water and be manufactured for exposure to the weather. Stone veneers should be selected from the materials known locally to be durable.

Brick or stone should be laid in a full bed of mortar. Care should be taken to avoid dropping mortar into the space between the veneer and sheathing paper, because this will block the cavity behind the veneer. Outside joints must be tooled to a smooth finish to provide maximum resistance to water penetration. Mortar mix proportions should conform to those shown in Table 5.

Masonry laid during cold weather should be protected from freezing until after the mortar has set. The temperature of the masonry and mortar should be maintained above 4i°F (5X) for at least 24 hours after installation.

PLANNING AHEAD

If an exterior finish requiring painting or staining is being installed, plan ahead to minimize work and potential problems.

-+ Prepare for painting and staining as the exterior finish is being installed. If nails have to be countersunk and the holes filled prior to painting or staining, do this as the materials are being installed.

For difficult to accebs areas and decorative wood trims or mouldings, sealing and priming these before installation will ensure complete cover age and simplify the application of finish coats.

For more information on exterior finishes, refer to the chapter entitled

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