Brick Bonds

Part of Brick Making

Patterns for laying bricks to maximize wall strength, stability, and weather resistance.

Why This Matters

Stack bricks in a simple column with all joints aligned and you get a wall that splits in half the moment any lateral force hits it — wind, an earthquake, even settling soil. The vertical joints become a fault line, and the wall cracks along that line as cleanly as if you had drawn it with a ruler.

Brick bonding patterns solve this by staggering the joints so that every brick bridges across the joint below it. This transforms a stack of individual units into a monolithic structure where forces are distributed across the entire wall. The pattern you choose determines the wall’s strength against different types of loads, its thickness, its resistance to water penetration, and how much material it uses.

Understanding bond patterns also matters for practical reasons: different patterns require different numbers of cut bricks, different skill levels to execute, and produce different aesthetic results. A rebuilding community needs to match the bond pattern to the building’s purpose — a garden wall, a load-bearing house wall, and a chimney each demand different approaches.

Brick Terminology

Before discussing patterns, you need the vocabulary:

Term	Meaning
Stretcher	Brick laid lengthwise along the wall face — you see its long side
Header	Brick laid end-on into the wall — you see its short end
Course	One horizontal row of bricks
Bed joint	The horizontal mortar joint between courses
Perpend (head joint)	The vertical mortar joint between bricks in a course
Bat	A brick cut in half across its width
Closer	A brick cut lengthwise, used at corners to maintain the pattern
Queen closer	A brick cut in half lengthwise — the most common closer
Quoin	The corner bricks of a wall

Standard brick dimensions (nominal): 225 mm long x 110 mm wide x 75 mm tall (9 x 4.5 x 3 inches). Adobe bricks are often larger — adjust spacing accordingly.

Common Bond Patterns

Stretcher bond (running bond)

The simplest and most common pattern. All bricks are laid as stretchers, with each course offset by half a brick length.

|-------|-------|-------|-------|
   |-------|-------|-------|-------|
|-------|-------|-------|-------|
   |-------|-------|-------|-------|

Properties:

• Wall thickness: one brick width (110 mm / 4.5 inches)
• Strength: good for partitions, garden walls, and veneers
• Not suitable as a standalone load-bearing wall — too thin
• Easiest pattern to lay — requires only whole bricks and half-bats at wall ends
• Uses the least material per square meter of wall face

Best for: Interior partitions, non-structural garden walls, cladding over a structural frame.

English bond

Alternates entire courses of stretchers with entire courses of headers. The strongest bond pattern for a wall one brick thick (225 mm / 9 inches).

|-------|-------|-------|-------|     (stretcher course)
|----|----|----|----|----|----|----|  (header course)
|-------|-------|-------|-------|     (stretcher course)
|----|----|----|----|----|----|----|  (header course)

Properties:

• Wall thickness: one brick length (225 mm / 9 inches)
• Strength: excellent — the strongest common bond for load-bearing walls
• Requires queen closers at corners (next to the quoin header) to maintain the pattern
• Uses about 30% more bricks than stretcher bond for the same wall area (because the wall is twice as thick)

Best for: Load-bearing exterior walls, foundations, any wall that must resist significant lateral or compressive loads.

Flemish bond

Each course alternates stretchers and headers. Adjacent courses are offset so headers sit above stretcher centers.

|-------|----|----|-------|----|----|
|----|----|-------|----|----|-------|
|-------|----|----|-------|----|----|

Properties:

• Wall thickness: one brick length (225 mm / 9 inches)
• Strength: slightly less than English bond but still excellent for load-bearing
• More attractive appearance — the alternating pattern creates visual rhythm
• Harder to lay correctly — requires careful alignment
• Same material usage as English bond

Best for: Exterior walls of important buildings where appearance matters alongside strength.

Common bond (American bond)

Five or six courses of stretchers, then one course of headers. A practical compromise between stretcher bond efficiency and the full-thickness strength of English bond.

|-------|-------|-------|-------|     (stretcher)
   |-------|-------|-------|-------|  (stretcher)
|-------|-------|-------|-------|     (stretcher)
   |-------|-------|-------|-------|  (stretcher)
|-------|-------|-------|-------|     (stretcher)
|----|----|----|----|----|----|----|  (header course - ties wall together)

Properties:

• Wall thickness: one brick length (225 mm / 9 inches) at header courses
• The stretcher courses can be a single wythe (one brick thick) with the header course tying to a backing wythe
• Faster to lay than English or Flemish — most courses are simple stretchers
• Adequate strength for most residential construction

Best for: General-purpose walls where speed of construction matters more than maximum strength.

Corner Construction

Corners are the most critical part of any brick wall. A poorly bonded corner is where walls separate and buildings fail.

Key principles:

1. Every other course must have a header turning the corner — this interlocks the two wall faces
2. Use queen closers (half-width bricks) next to the corner header to maintain the bond pattern on both faces
3. Check plumb at corners first and frequently — if a corner leans, every brick laid from it will be wrong
4. Build corners first, then fill between them — stretch a string line between corners to keep courses level

Corner sequence for English bond:

1. Lay a stretcher course on Wall A, ending with a header at the corner
2. Lay a header course on Wall B, starting from the same corner with a queen closer
3. Next course: swap — Wall A gets headers, Wall B gets stretchers
4. Continue alternating

Corner plumb check

After every 3-4 courses, hold a straight stick or plumb line against both faces of the corner. The corner should be perfectly vertical in both directions. Correct any drift immediately — it compounds with every additional course.

Mortar Joints

The bond pattern is only as good as the mortar holding it together.

Mortar mix for brick bonds:

• 1 part lime putty (or hydraulic lime)
• 3 parts clean, sharp sand
• Water to a buttery consistency — mortar should hold its shape on the trowel without slumping

Joint thickness: 10-12 mm (3/8-1/2 inch) for fired bricks, 15-20 mm for adobe (larger bricks need more tolerance).

Joint profiles for weather resistance:

Profile	Description	Water Resistance
Struck	Angled inward at the top, flush at bottom	Good — sheds water
Weathered	Angled inward at the bottom, flush at top	Best — directs water away from the brick below
Flush	Cut even with the wall face	Moderate
Raked	Recessed into the wall	Poor — traps water. Use only on interior walls
Concave (bucket handle)	Curved inward	Good — compresses mortar and sheds water

Wet bricks before laying

Dry bricks absorb water from the mortar before it can cure, weakening the bond. Dip each brick in water for 5 seconds before laying (don’t soak — just dampen the surface). Adobe bricks should NOT be wetted, as they will soften.

Choosing the Right Bond

Building Type	Recommended Bond	Wall Thickness	Why
Garden wall (non-structural)	Stretcher	110 mm	Minimizes materials
Interior partition	Stretcher	110 mm	Does not bear load
Single-story house wall	Common or English	225 mm	Bears roof load, resists wind
Two-story house wall	English	225-340 mm	Maximum load capacity
Foundation wall	English	340 mm+	Must resist earth pressure
Chimney	English	225 mm	Must withstand heat cycling
Retaining wall	English	340 mm+	Must resist lateral earth pressure
Decorative feature	Flemish or herringbone	Varies	Appearance priority

The bond pattern is the structural logic of masonry. Choose it based on what the wall must do, execute it with consistent mortar joints and plumb corners, and the wall will outlast everything else you build.