Stack bond is a method of laying brick or tile whereby all of the joints are in line and bricks or tile are stacked directly on top of one another and directly adjacent.
It is also called stacked bond. Each unit sits squarely on the one below, so the head (vertical) joints run continuously up the wall, giving a clean grid pattern. In US building codes, any masonry not laid in running bond is treated as stack bond for design purposes, and stack bond carries extra reinforcement requirements.
Stack bond vs running bond
| Stack bond | Running bond | |
|---|---|---|
| Joint layout | Head joints aligned vertically | Head joints offset, usually by half a unit |
| Look | Modern, grid-like | Traditional staggered pattern |
| Strength | Little interlock; relies on reinforcement | Units overlap and spread load along the wall |
| Typical use | Veneer, feature walls, reinforced block, tile | Most brick and block walls |
| Layout tolerance | Very visible; units must be consistent in size | More forgiving |
Why stack bond needs reinforcement
In running bond, each unit overlaps the two below it, so loads and movements spread along the wall. In stack bond nothing ties one column of units to the next except the mortar in the head joints. That makes an unreinforced stack bond wall weaker in bending along its length and more likely to crack straight up a joint line.
Codes deal with this by requiring horizontal reinforcement, typically joint reinforcement in the bed joints or bond beams in block walls. Structural walls in stack bond are usually reinforced concrete block with grouted cells. Follow the masonry details on the drawings for spacing and size.
Where stack bond is used
- Brick veneer on modern buildings, tied back to the structure.
- Concrete block (CMU) walls designed as reinforced masonry.
- Vertical stack bond: units set on end (soldiers) for accent bands and feature walls.
- Tile: straight stack layouts for wall tile and large-format panels.
Site tips
- Check unit size tolerances before laying. Small variations show clearly along continuous joints.
- Lay out the wall with a story pole and plumb lines so head joints stay straight over the full height.
- Confirm joint reinforcement type and spacing before the first course.
- Coordinate movement joints with the pattern so they fall on joint lines.
- Build a mockup panel so the architect can approve joint width, colour and tooling.
Related terms
Related templates and guides
- Masonry terms and definitions
- QA/QC checklist: block (masonry) walls
- Reinforced masonry best practices
- Masonry coursing tables, shapes and sizes
Frequently asked questions
Is stack bond weaker than running bond?
Yes, in most cases. Because the head joints line up, there is no overlap to tie units together along the wall, so an unreinforced stack bond wall is weaker and more prone to cracking along those continuous joints. Codes therefore require extra horizontal reinforcement for stack bond masonry.
Can stack bond be used for load-bearing walls?
It can when the wall is designed and reinforced for it, typically reinforced concrete block with grouted cells and horizontal reinforcement. Most stack bond brick in buildings is non-load-bearing veneer. The structural or masonry engineer’s drawings decide what is allowed.
What is a vertical stack bond?
Vertical stack bond sets the units on end, usually as soldiers, so the long side runs vertically and all joints line up both ways. It is a decorative pattern used for accents, feature walls and tile, and has the same need for reinforcement as horizontal stack bond in masonry.
Is stacked bond the same as stack bond?
Yes. Stack bond, stacked bond and stack bonding all describe the same pattern, with every unit directly above the one below and continuous vertical joints. In tile work it is also called straight stack.
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