Anchor and Tie Systems for Full-Thickness Brick Veneer

What Is Full-Thickness Brick Veneer?

Full-thickness brick veneer is a single wythe of standard-size brick (nominally 3-5/8 in. thick) attached to a structural backup wall — typically wood studs, steel studs, or concrete masonry — with a clear cavity between them. The brick carries no structural floor or roof load; it is a weather screen and finished face. All lateral loads (wind pressure and suction) are transferred to the backup through metal ties and anchors. Because those ties are the only mechanical connection between the veneer and the structure, selecting the right type, spacing them correctly, and ensuring they will not corrode are life-safety issues.

The Veneer Cavity System — Components You Must Know

Weather-Resistive Barrier (WRB). A code-required membrane (housewrap, building paper, or fluid-applied) covers the backup wall. It is the last line of defense against water that penetrates the brick.

Cavity. The air space between the back face of the brick and the face of the WRB. Industry best practice is a minimum 1-inch clear cavity; many specifications call for 2 inches. The cavity allows water that enters the veneer to drain down and exit through weep holes at the base rather than soaking the backup.

Drainage plane. The continuous surface — formed by the WRB — that channels water downward to the flashing and weeps. Mortar droppings that fill the cavity block the drainage plane; keeping it clear is a quality-control responsibility on every job.

Collar joint. The space between two wythes when they are built close together, often filled with mortar. In true veneer construction the cavity is not a collar joint and must not be mortar-filled.

Ties and anchors. The metal fasteners connecting the veneer wythe to the backup. They resist the lateral loads described above.

Corrugated Strip Ties vs. Adjustable Two-Piece Ties

Corrugated strip ties are stamped from sheet metal into a corrugated (ridged) strip. One end is nailed or screwed to the stud; the other end is embedded in a mortar bed joint of the brick. They are simple and inexpensive but require that the mortar bed joint line up reasonably close to the stud fastening point — typically within one brick course. If the mortar joint does not align with the fastener, the tie must be bent, which reduces its load capacity significantly.

Adjustable two-piece ties consist of a wall anchor (a plate or pin fastened to the backup) and a separate wire or rod eye that slides or hooks onto the anchor. The sliding action gives vertical adjustment — often ±1-1/4 inches or more — so the tie can engage any mortar joint regardless of where the stud falls. Two-piece ties are preferred on steel-stud backup walls and in applications where coursing alignment is difficult to guarantee.

Spacing Requirements

NCCER and industry references derived from building codes establish maximum spacing limits. Horizontal spacing is typically one tie per stud bay, with studs at 16 in. or 24 in. on center. Vertical spacing is typically no more than 18 in. on center (every third course of standard brick, which courses at 2-2/3 in. per course — 8 courses = approximately 21-1/3 in., so ties must be placed more frequently than every 8 courses). Always verify the project specification; some high-wind or seismic zones require tighter spacing.

The rule of thumb for calculating tie quantity: one tie is required for every 2.67 sq ft of wall area, though project specs or local codes may be more conservative. Use this formula:

> Number of ties = Total wall area (sq ft) ÷ 2.67

Round up to the next whole number — never down.

Corrosion Resistance — Why It Matters

Ties are buried inside a wall where moisture is always present. A corroded tie loses cross-section and can fail without warning, allowing the veneer to detach. Acceptable corrosion protection includes:

• Hot-dipped galvanized — minimum coating weight per applicable ASTM standards (check project spec for the exact designation).
• Stainless steel — Types 304 or 316; required in marine or highly corrosive environments.
• Mechanically galvanized or electroplated — generally acceptable for interior or low-moisture conditions only; not a substitute for hot-dipped galvanizing on exterior veneer.

Always reject ties that show red rust, pitting, or coating that flakes off when flexed. Stainless and hot-dipped galvanized ties look different — learn to tell them apart by markings, color, and surface texture.

Safety Points

• Wear cut-resistant gloves when handling wire ties — cut ends are razor-sharp.
• On scaffolding, secure tie bundles so they cannot fall on workers below.
• Never modify (bend sharply, nick, or weld) a tie and then install it as though it were undamaged.
• When using powder-actuated fasteners to attach anchor plates to concrete or steel backup, only trained and certified operators may operate the tool; bystanders must clear the area.
• Inspect ties visually before installation — do not rely on packaging alone to confirm coating type.

Quality-Control Checks

Before the scaffold is moved and the wall section becomes inaccessible, verify: correct tie type is installed, mortar fully embeds the tie (minimum 5/8 in. cover to the exterior face of the joint), ties are not bent more than the manufacturer allows, and the cavity is free of mortar bridging the drainage plane.