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Safety Cue
Task-specific safety guidance for ordinary corner and pier construction hazards.
Chapter 9
Build Brick Corners and Piers
Build one brick corner lead and one small nonstructural pier practice assembly within approved height and stability limits, maintaining bond, plumb, joint consistency, and a proper cap or termination.
Field Cue System
These cues appear at the point of work. They identify safety, code, manufacturer, and measurement issues before they become rework, structural risk, or moisture damage.
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Critical Safety Cue
Serious injury, structural failure, or major damage is possible.
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Field Safety Cue
Practical work-area safety: access, footing, lighting, and housekeeping.
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Code Alert
Local requirements vary. Verify permit, inspection, and jurisdictional rules.
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Manufacturer Cue
Follow product-specific instructions for units, mortar, ties, and reinforcement.
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Measurement Cue
Course height, bond, square, and plumb reference guidance.
Job Overview
This chapter qualifies you to build one brick corner lead and one small nonstructural pier, both governed by the readiness plan from Chapter 1, the work-area setup from Chapter 2, the mortar batch from Chapter 3, and the layout, story pole, and mason's-line references from Chapter 4. The finished work product is one completed corner lead built from the practice wall started in Chapter 8, and one freestanding brick pier built to its approved height limit and capped.
Chapter 8 taught running-bond brick laying along a straight wall face. This chapter extends that skill to the two conditions every brick project eventually requires: a corner, where two wall faces meet and both directions must read plumb, level, and square at once; and a pier, where every face of a single freestanding column must be controlled simultaneously. Both conditions concentrate more risk of drift, bond error, and instability into a smaller area than a straight wall run.
Nothing in this chapter authorizes work on a structural pier, a load-bearing corner, or any brick assembly identified in the Chapter 1 readiness plan as load-bearing, retaining, or requiring an engineered design. This chapter is limited to the nonstructural practice corner and the small pier described in the Project Specification Sheet.
Skills You Will Demonstrate
- RM-049 — Lay brick corners, establishing both wall directions from a single corner unit and maintaining bond across the turn.
- RM-050 — Build masonry leads, racking back each course from the corner in the specified stepped pattern to control line and elevation for later infill work.
- RM-051 — Construct a brick pier, maintaining square, bond, and interlocking coursing on all four faces within the approved freestanding height limit.
- RM-052 — Maintain plumb on every corner face and every pier face throughout construction, not only at the top course.
- RM-053 — Maintain consistent bed and head joints across the corner lead and the pier, matching the joint width and tooling profile established in Chapter 8.
- RM-054 — Inspect the finished corner and pier for bond, square, plumb, stability, cap or termination, joint condition, and surface cleanliness.
Where This Skill Fits
Corner leads control line and course elevation for every wall section built between them; the mason's line used in Chapter 8 and future veneer chapters is stretched from lead to lead, not laid free-hand along the whole wall length. A corner lead built out of plumb or off bond will transfer that error into every course of infill work that follows.
The pier assembly in this chapter is a self-contained exercise in four-face control. The same discipline — checking every face, not just the one facing the mason's line — applies directly to Chapter 16's garden-wall piers, Chapter 11's veneer corner leads, and the Chapter 20 capstone.
Scope and Intended Use
This chapter covers:
- reviewing the approved corner bond, pier dimensions, bond pattern, reinforcement or core details, cap, and freestanding height limit before laying begins
- verifying that both bases are level, square, stable, and adequately sized for the corner lead and the pier
- dry-laying and adjusting the unit and joint module at both first courses
- building a stepped, racked-back corner lead with bond, level, square, and plumb maintained on both wall directions
- building a small nonstructural pier with interlocking coursing, level, plumb on all four faces, and a specified cap or termination
- tooling, cleaning, protecting, and inspecting both assemblies
This chapter does not authorize the learner to:
- build any pier, corner, or column identified as structural, load-bearing, or requiring an engineered design without that design and its inspection sequence
- exceed the approved freestanding height for the pier without bracing or a design that specifically permits the additional height
- install reinforcement, ties, or grout in the pier beyond what the chapter outline specifies; reinforced and grouted assemblies are governed by Chapter 7
- use this corner lead or pier as a structural component of any occupied building; both assemblies remain nonstructural practice work
Any base, square, or stability condition that fails inspection in this chapter must be corrected and reinspected before mortar is spread.
Reference Conventions
Establish these references before laying the first corner or pier unit, and use them consistently across both assemblies.
| Term | Definition |
|---|---|
| Corner lead | The stepped, racked-back masonry built up first at a wall corner, from which mason's lines are stretched to guide the infill courses between leads |
| Rack-back | The specified stepped reduction of each successive course's length as the lead rises, leaving each course one unit shorter than the course below it on the racked side |
| Corner arris | The vertical edge formed where the two wall faces of the corner meet; the primary plumb-check line for the corner |
| Pier | A freestanding brick column, built with interlocking coursing on all faces, whose height in this chapter is limited to the approved freestanding limit without bracing or design |
| Freestanding height limit | The maximum height stated in the approved pier detail above which bracing or an engineered design is required before continuing |
| Cap or termination | The specified finishing course, cap unit, or capping detail that completes the top of the pier |
Project Identification Record
Before beginning either assembly, record the following directly on the Corner and Pier Work Record:
Corner bond pattern: ______ Corner height (courses): ______ Rack-back pattern: ______
Pier plan dimensions: ______ Pier bond or core arrangement: ______ Approved freestanding height limit: ______
Cap or termination specified: ______ Reinforcement, ties, or grout specified: ______ (Y/N, describe) Date: ____________ Mason name: ____________
Prerequisites
- Completion of Chapter 1 through Chapter 8, including a completed, approved brick practice wall and a documented mortar mix
- The approved corner and pier detail specifying bond pattern, dimensions, reinforcement or core arrangement, cap, and freestanding height limit
- Level, square, stable bases sized for both the corner lead and the pier, confirmed under the Chapter 1 readiness plan
- A mixed, workability-checked mortar batch prepared under Chapter 3
- Story pole, mason's line, line blocks, and a squaring method staged before laying begins
Common Field Fundamentals
A corner and a pier both require simultaneous control of more directions than a straight wall run. Establishing that control at the base, and rechecking it every course, prevents the drift that a straight-wall mason may not notice until several courses have accumulated.
Base checkLevel, square, stable, and adequately sized before any unit is laid
Corner bondBoth wall directions read correctly from the same corner unit
Rack-backEach course stepped back the specified amount, never an unsupported tooth
Pier squarenessAll four faces checked, not only the line-facing face
PlumbChecked every course on every face of both assemblies
Course heightVerified against the story pole at both assemblies
Height limitPier does not exceed the approved freestanding height without bracing or design
Cap and inspectionSpecified cap installed; bond, square, plumb, stability, and joints inspected
Corners, Leads, and Piers Are Not Ordinary Wall Runs
A corner lead controls the line and elevation of every course laid between it and the next lead; an error at the lead is carried into all connecting work. A pier is checked on every face because no adjacent wall run exists to visually confirm alignment. Treat both assemblies with the same care given to the readiness inspection in Chapter 1 and the layout in Chapter 4 — verify before proceeding, and do not assume a condition is correct because it was correct on a previous project.
RM-049 – RM-054
Masonry Construction / Layout / Inspection
Brick Corner Lead and Pier Construction
A. Finished-Project Specification
Deliverable: one plumb brick corner lead built to the specified bond, rack-back pattern, and course height, connecting to the Chapter 8 practice wall; and one separate, stable, capped nonstructural brick pier built to its approved plan dimensions, bond or core arrangement, and freestanding height limit.
B. Component and Reference Schedule
| Assembly | Controlling Reference | Course Height Control | Termination |
|---|---|---|---|
| Corner lead | Approved corner bond and rack-back pattern from the corner and pier detail | Story pole from Chapter 4, transferred to both wall directions | Connects to mason's line for infill wall courses |
| Pier | Approved pier plan dimensions and bond or core arrangement | Story pole checked on all four faces | Specified cap unit or capping detail at the approved freestanding height limit |
C. Acceptance Standards
| Check | Standard |
|---|---|
| Corner angle | Matches the approved corner detail within the tolerance stated in that detail; verified with a square or diagonal measurement at the base and after every several courses |
| Corner and pier plumb | Every face plumb at every course; no visible lean on any face when checked with the mason's level |
| Rack-back | Each course stepped back exactly the pattern specified in the corner detail; no unapproved tooth or unsupported overhang |
| Bond | Corner and pier bond match the pattern specified in the approved detail with no aligned vertical joints unless the design permits them |
| Course height | Matches the story pole at both assemblies within the tolerance stated in the approved detail |
| Joints | Full bed and head joints at the width specified in Chapter 4; tooled to the profile established in Chapter 8 |
| Pier height | Does not exceed the approved freestanding height limit without the specified bracing or an engineered design permitting the additional height |
| Cap or termination | Installed exactly as specified in the approved detail; not substituted or omitted |
| Stability | Pier and corner lead show no rock, shift, or movement when checked by hand after adequate cure; any movement is a Stop-Work condition requiring reinspection of the base and joints below the point of movement |
D. Preparation — Base Verification and Layout
- Review corner or intersection detail, bond pattern, reinforcement, anchors, wall thickness, and height. Confirm the pier detail separately, including its plan dimensions, bond or core arrangement, cap, and freestanding height limit.
- Verify base dimensions and square. Recheck both the corner base and the pier base for level, square, stability, and adequate size using the level, square, and tape measure; do not proceed on a base that fails this check.
- Mark both wall baselines. Use the Chapter 4 layout record to mark the corner baselines; mark the pier footprint separately using a chalk line and the approved pier plan dimensions.
E. Corner Lead Construction
- Dry-lay the first-course corner units. Place units without mortar along both wall directions from the corner point to confirm module and joint width.
- Adjust layout for correct overlap and modular dimensions. Shift units as needed to minimize cuts while preserving the specified bond and joint width.
- Spread mortar for the corner lead. Spread and furrow a mortar bed sized for the corner unit and the first few units in each direction.
- Set the first corner block to level, square, and elevation. Tap the corner unit to the story-pole elevation, check level in both directions, and check the corner angle with a square before proceeding.
- Lay units extending in both wall directions. Butter head joints and set units outward from the corner along each wall line, maintaining full bed and head joints.
- Check the corner angle with square or diagonal controls. Reverify the angle after the first course is complete in both directions.
- Build the lead one course at a time. Complete each course fully before beginning the next; do not build one direction significantly ahead of the other.
- Rack back each course using the approved stepped pattern. Step each course back by the specified amount on the racked side; do not leave an unsupported tooth.
- Maintain bond and overlap. Confirm the bond pattern reads correctly across the corner turn at every course.
- Use the story pole to control course elevation. Check every course against the story pole marks transferred from Chapter 4.
- Check plumb on both faces and the corner arris. Use the mason's level on each wall face and along the corner arris at every course.
- Install intersecting-wall ties, bond units, reinforcement, or anchors as specified. Install only where the approved corner detail requires them; do not add unspecified reinforcement.
- Do not create an unapproved tooth or unsupported intersection. Every racked-back course must remain fully bearing on the course below it.
- Stretch mason's lines from the lead for connecting wall work. Set line blocks at the lead and stretch the line toward the connecting wall run once the lead has reached its required course count.
- Keep the lead only the permitted number of courses above adjacent work. Confirm this limit against the approved corner detail; do not build the lead excessively far ahead of the infill work it will guide.
- Tool joints at the proper time. Tool bed and head joints when thumbprint hard, matching the profile established in Chapter 8.
- Inspect corner square, plumb, bond, rack-back, ties, and course height. Complete this inspection before considering the lead finished.
- Correct drift before mortar hardens. Adjust any unit found out of plumb, level, or bond while the mortar remains workable; do not leave a known drift condition for later correction.
- Document the completed intersection. Record final course count, height, angle measurement, and photographs on the Corner and Pier Work Record.
F. Pier Construction
- Review pier dimensions, bond pattern, reinforcement or core details, cap, and height limit. Confirm these match the Project Identification Record before laying begins.
- Verify the pier base is level, square, stable, and adequately sized. Recheck independently of the corner base verification in Step D.2.
- Dry-lay the pier first course to the approved bond. Confirm the plan dimensions and bond or core arrangement match the approved detail.
- Verify pier dimensions and square. Check all four sides and both diagonals of the first course before spreading mortar.
- Continue pier courses with interlocking bond or approved core arrangement. Maintain the specified bond so that each course interlocks with the course below on every face.
- Install reinforcement, ties, or grout only where specified. Do not add reinforcement, ties, or grout beyond what the approved pier detail requires; a fully grouted, reinforced pier is governed by Chapter 7, not this chapter.
- Check each course for level. Verify level across all faces of the pier at every course.
- Check all pier faces for plumb. Use the mason's level on every face, not only the face nearest the work area entrance, at every course.
- Rotate or blend brick for consistent appearance. Select units to maintain uniform color and texture across all visible faces.
- Maintain full bed and head joints. Confirm joint width and fullness match the standard established in Chapter 8.
- Do not exceed the approved freestanding height without bracing or design. Stop construction at the approved freestanding height limit unless the specified bracing is installed or an engineered design permits additional height.
- Install the specified cap or termination. Install the exact cap unit or capping detail specified in the approved pier detail; do not substitute a different termination.
- Tool and clean joints. Tool bed and head joints on all faces and remove excess mortar without smearing.
- Protect the assemblies through cure. Cover both the corner lead and the pier as required by the anticipated weather conditions identified in the Chapter 1 readiness plan.
- Inspect bond, square, plumb, stability, cap, joints, and surface condition. Complete this inspection on both assemblies before considering the chapter project finished.
- Document final measurements. Record final pier height, plan dimensions, and cap installation on the Corner and Pier Work Record.
Common Readiness Inspection
Inspect both the corner lead and the pier using the same checks regardless of which assembly is reviewed first.
- Base check: confirm both bases were verified level, square, stable, and adequately sized before mortar was spread.
- Angle and square check: confirm the corner angle and the pier's four sides and diagonals were checked at the base and rechecked as courses were added.
- Plumb check: confirm every face of both assemblies was checked for plumb at every course, not at intervals.
- Bond and rack-back check: confirm the corner rack-back pattern and the pier's interlocking bond match the approved detail with no unapproved tooth or aligned vertical joints.
- Height-limit check: confirm the pier does not exceed the approved freestanding height without the specified bracing or design.
- Termination check: confirm the specified cap or termination is installed and matches the approved detail.
- Stability check: confirm both assemblies show no rock, shift, or movement after adequate cure.
Complete the Corner and Pier Work Record in the Inspection Checklist section below before beginning Chapter 10.
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Failure Points and Troubleshooting
Cleanup
This chapter ends with two protected, cured, documented masonry assemblies, not a verbal impression of their condition.
- Remove excess mortar from the mortarboard and clean all tools before mortar sets
- Brush loose mortar crumbs from both the corner lead and the pier after tooling
- Cover both assemblies with the protection specified for the anticipated weather conditions
- Store the mason's line, line blocks, story pole, and squaring tools for reuse in Chapter 10 and later chapters
- File the completed Corner and Pier Work Record with the Chapter 1 readiness plan and the Chapter 4 layout record for this location
Field Terms
- Corner Lead
- Stepped masonry built up first at a wall corner, guiding the mason's line for infill wall courses.
- Rack-Back
- A stepped reduction in course length as a lead rises, used to control elevation without an unsupported tooth.
- Corner Arris
- The vertical edge where two wall faces of a corner meet.
- Pier
- A freestanding masonry column built with interlocking coursing on every face.
- Freestanding Height Limit
- The maximum unbraced height a pier may reach before bracing or an engineered design is required.
- Cap or Termination
- The specified finishing detail that completes the top of a pier or wall.
- Interlocking Bond
- A bond pattern in which units overlap across faces so no continuous vertical joint runs through the assembly.
- Line Blocks
- Devices that hold the mason's line at the corner lead while infill courses are laid.
- Diagonal Check
- A method of verifying square by comparing the two diagonal measurements of a rectangular layout.
- Stop-Work Condition
- A condition, such as pier instability or an unresolved base failure, that halts work until a qualified professional evaluates it.
Skill Check
- Why must the corner angle be rechecked at intervals as the lead rises, rather than confirmed only at the first course?
- What is a rack-back pattern, and what condition results if a course is stepped back by the wrong amount?
- Why must all four faces of a pier be checked for plumb at every course, rather than only the face nearest the work area?
- What must the mason do, and not do, if a pier approaches its approved freestanding height limit before the cap is installed?
- Why is a reinforced, grouted pier outside the scope of this chapter, and which chapter governs that work?
- What must happen if a completed pier is found to rock or shift after cure?
- Why does the corner lead control the elevation of the infill wall courses built between two leads?
- What must be verified about both bases before mortar is spread for the corner lead and the pier?
- What is the difference between correcting drift while mortar remains workable and correcting it after the mortar has set?
- Why must the specified cap or termination be installed exactly as detailed, rather than substituted with another available unit?
Competency Rubric
| Competency | Independent Pass Standard | Not Demonstrated | With Assistance | Independently |
|---|---|---|---|---|
| RM-049 | Lays a brick corner from a single corner unit, establishing both wall directions with correct bond across the turn | |||
| RM-050 | Builds a racked-back corner lead matching the approved stepped pattern, with no unapproved tooth or unsupported course | |||
| RM-051 | Constructs a brick pier with square, interlocking bond, and correct plan dimensions, within the approved freestanding height limit | |||
| RM-052 | Maintains plumb on every corner face and every pier face at every course, correcting drift before mortar hardens | |||
| RM-053 | Maintains full, consistent bed and head joints across the corner lead and the pier, matching the specified width and tooling profile | |||
| RM-054 | Inspects the finished corner and pier for bond, square, plumb, stability, cap, joints, and surface cleanliness, and documents the results |
Mark one column per competency. Only Demonstrated Independently awards the competency; Demonstrated with Assistance authorizes additional supervised practice but does not complete the requirement.
Inspection Checklist — Corner and Pier Work Record
| Item | Finding | Deficient / Stop-Work | Correction or Referral | Reinspected (Date) |
|---|---|---|---|---|
| Corner base level/square | ||||
| Corner angle | ||||
| Corner rack-back and bond | ||||
| Corner plumb (both faces) | ||||
| Pier base level/square | ||||
| Pier square and bond | ||||
| Pier plumb (all four faces) | ||||
| Pier height vs. freestanding limit | ||||
| Cap or termination | ||||
| Joints and surface cleanliness |
Professional referrals made: ____________ Hold points before Chapter 10: ____________
Final assembly condition: ______ (Approved / Conditional / Rejected) Date: ____________ Mason name: ____________
Performance Check
With both assemblies complete, review the Corner and Pier Work Record against the Acceptance Standards table and confirm every base, angle, bond, plumb, height-limit, cap, and joint item has been recorded with a measurement or photograph reference. Confirm every Deficient item has a documented correction and reinspection record, and any Stop-Work item has a documented professional referral. Do not proceed to Chapter 10 until both the corner lead and the pier show a Deficient-free or fully corrected and reinspected condition.
Project Closeout
You have completed the ninth chapter in the residential masonry sequence: building brick corners and piers. This chapter required you to lay brick corners (RM-049), build masonry leads (RM-050), construct a brick pier (RM-051), maintain plumb (RM-052), maintain consistent joints (RM-053), and inspect the finished corner or pier (RM-054).
You now have a plumb, square, bonded brick corner lead ready to guide infill wall courses, and a stable, capped, nonstructural brick pier built within its approved freestanding height limit. Both assemblies carry into Chapter 10, where you will learn to cut brick, block, and stone safely — a skill both this chapter's corner lead and future veneer and repair chapters depend on for fitting units at corners, openings, and terminations.
File your completed Corner and Pier Work Record, photographs, and any professional referrals with the Chapter 1 readiness plan and the Chapter 4 layout record for this location. You will reference this documentation throughout the rest of this book.