Bachelors Program in Construction Technology
Building Construction Techniques
•
Bachelor
Masonry Construction
Introduction and context
Masonry construction is the assembly of units—such as fired clay bricks, concrete blocks, calcium-silicate units, or natural stone—using mortar, restraints, reinforcement, and associated damp- and movement-control components. It remains a core construction technology because masonry is durable, fire resistant, acoustically effective, thermally useful, locally adaptable, and comparatively economical. Its performance, however, depends less on the unit alone than on the interaction between units, mortar, workmanship, moisture control, structural support, and movement accommodation.
Masonry may be load-bearing or non-load-bearing. Load-bearing masonry transfers gravity loads and sometimes lateral loads to foundations. Non-load-bearing masonry forms partitions, façades, and infill panels and must be supported and restrained against wind, impact, and building movement. Modern masonry construction therefore combines traditional bonding practices with engineering design, proprietary reinforcement, cavity-wall systems, and systematic quality inspection.
This chapter focuses on brick, block, and stone construction; bond selection; mortar; reinforcement; cavity walls; movement joints; damp control; lintels; and inspection. Design and construction must always comply with the applicable national building regulations, structural masonry standards, manufacturer instructions, and project specifications.
Learning objectives
By the end of this chapter, a student should be able to:
Distinguish common masonry units and select them for appropriate applications.
Explain the functions of masonry bonds, mortar, reinforcement, ties, and joints.
Describe sound procedures for brick, block, and stone construction.
Detail cavity walls, damp-proof courses, flashings, weep holes, and lintels.
Identify common defects, their causes, and suitable preventive measures.
Apply inspection and quality-control procedures to masonry work.
Evaluate masonry solutions in relation to structural performance, durability, sustainability, and workmanship.
1. Masonry units and their performance
1.1 Bricks
A brick is a relatively small masonry unit, commonly manufactured from fired clay or shale. Its dimensions permit handling by one person and allow complex bonding patterns. Important properties include compressive strength, water absorption, dimensional tolerance, frost resistance, thermal conductivity, density, and durability in the intended exposure.
Bricks may be classified by material, manufacturing process, strength, and use. Facing bricks are selected for appearance and exposure resistance. Engineering bricks are dense, strong, and low in water absorption, and are used where high strength or resistance to moisture is required. Common bricks may be suitable for protected or internal work, subject to specification.
Brickwork depends on regular bed joints and properly filled perpends (vertical joints). Excessive variation in unit size produces uneven joints, poor alignment, and concentrated stresses.
1.2 Concrete and other blocks
Concrete masonry units are larger than bricks and may be solid, cellular, or hollow. They can be manufactured from dense aggregate, lightweight aggregate, or autoclaved aerated concrete (AAC). Larger units increase productivity by reducing the number of joints, while hollow cores can receive reinforcement and grout.
Dense blocks provide strength, impact resistance, and sound insulation but are relatively heavy and may have higher thermal conductivity. Lightweight blocks reduce dead load and improve thermal performance, although their fixing capacity, moisture response, and impact resistance must be considered. AAC units are light and thermally efficient but require compatible thin-joint mortar and careful protection from prolonged saturation.
Blocks must be stored on level supports, protected from contamination, and handled to avoid cracking. Units with excessive damage or dimensional distortion should not be incorporated into critical work.
1.3 Natural stone
Stone masonry uses quarried or naturally occurring stone, either as regular ashlar, coursed rubble, random rubble, or veneer. Stone selection must consider mineral composition, porosity, bedding planes, weathering, freeze–thaw exposure, salt action, and compatibility with mortar. Stone is strong in compression but weak in tension and vulnerable to instability if joints, through-stones, or connections are inadequate.
A stone wall should have a coherent arrangement of faces, hearting, and bonding stones. Large facing stones alone do not create a sound wall if the interior is poorly packed or if the two faces are not adequately tied together.
1.4 Masonry terminology
The principal terms are:
Bed joint: horizontal mortar joint between successive courses.
Perpend or cross joint: vertical joint between adjacent units.
Course: a continuous horizontal layer of masonry.
Wythe or leaf: a continuous vertical thickness of masonry.
Quoin: corner or external angle of masonry.
Stretcher: unit laid with its long face parallel to the wall face.
Header: unit laid with its short end visible on the wall face.
Closer: cut or specially manufactured unit used to complete a bond at an opening or corner.
Coping: protective top treatment to a wall or parapet.
Cavity: intentional air space between masonry leaves.
Damp-proof membrane (DPM): membrane used mainly beneath floors or slabs to control ground moisture.
Flashing: sheet or formed material that directs water out of a construction.
Weep hole: opening that drains water from a cavity, flashing, or masonry feature.
2. Principles of masonry bonding
Bonding arranges units so that vertical joints are staggered and loads are distributed. It also ties the wall face together, improves resistance to cracking, and provides an appropriate appearance. The nominal overlap and unit dimensions should follow the governing standard and project specification; a bond should not be improvised merely to achieve an attractive pattern.
2.1 Common brick bonds
Stretcher bond consists mainly of stretchers with half-unit overlap between courses. It is common for half-brick partitions and cavity-wall leaves, but it is not normally adequate for a thick solid load-bearing wall unless specifically designed and detailed.
Header bond exposes the short ends of units and provides substantial transverse interlock. It may be used for thick walls, curved work, or special architectural effects.
English bond alternates courses of headers and stretchers. It provides good transverse bonding and is traditionally associated with strong solid brickwork.
Flemish bond alternates headers and stretchers within each course. It offers an attractive pattern but requires careful use of closers and accurate workmanship.
Stack bond aligns vertical joints. It is primarily architectural and has low inherent interlock; reinforcement or special detailing is generally required where structural performance is needed.
At corners, intersections, and openings, the bond must be maintained with correctly sized closers and properly toothed or bonded returns. Unplanned vertical joints at corners are a common source of weakness and cracking.
2.2 Bonding in block and stonework
Blockwork is normally laid in running bond, with vertical joints staggered. Blocks may be laid with their designated webs and cores oriented as specified. Stonework may be coursed or random, but every wall requires adequate transverse bonding. Through-stones or bonding stones should extend well into the wall and be distributed vertically and horizontally according to the design.
3. Mortar: selection and use
Mortar binds units, seals joints, accommodates small dimensional variations, transfers compressive and shear stresses, and contributes to weather resistance. It is not simply a stronger adhesive. A mortar that is excessively strong or stiff may be incompatible with weaker or more porous units and can increase cracking or damage during movement and weathering.
3.1 Mortar constituents
Traditional mortar contains cementitious binder, clean well-graded sand, and water. Lime may improve workability, water retention, and accommodation of movement. Proprietary masonry cements and factory-made mortars contain controlled combinations of binders and additives. Admixtures should be used only when permitted and in the specified dosage.
Sand grading affects workability, shrinkage, and joint texture. Contaminated or poorly graded sand may cause weak, segregated, or excessively shrinkable mortar. Water should be clean and free from substances that adversely affect setting or reinforcement.
3.2 Selection principles
Mortar selection should consider:
unit strength, suction, and porosity;
exposure to rain, frost, salts, and chemicals;
structural loading and wall function;
required bond and workability;
compatibility with historic or weak masonry;
joint profile and appearance;
curing conditions and construction speed.
The mortar should generally be no stronger and less deformable than necessary for the masonry system. Structural design standards may specify strength classes and durability requirements. A site team must not substitute a high-cement mix for a specified mortar merely because it appears stronger.
3.3 Site practice
Mortar should be batched consistently, mixed thoroughly, and used within its permitted working period. Re-tempering with water after initial setting can reduce performance and should not be permitted unless the product specification expressly allows it. Mortar joints should be fully filled, particularly in exposed work. Joint profiles such as weather-struck, bucket-handle, flush, recessed, or raked profiles affect drainage and durability; deeply recessed joints are generally unsuitable for exposed façades because they collect water and shadow the unit edges.
Mortar should be protected from rapid drying, frost, heavy rain, and extreme heat. Fresh masonry may require covers, controlled curing, and temporary restraint.
4. Construction methods
4.1 Setting out and preparation
Before laying begins, the contractor should verify grid lines, dimensions, levels, opening positions, foundation or slab readiness, DPC continuity, service penetrations, and interface details. A datum and gauge rod are used to control course heights. The first course is especially important because errors at the base propagate upward.
The substrate should be clean, stable, and adequately cured. Masonry units should be conditioned as required: highly absorptive units may need controlled dampening, while saturated units should not normally be laid because excess water can weaken the joint and delay drying.
4.2 Laying brick and blockwork
A competent sequence is:
Mark corners, openings, returns, and control-joint positions.
Establish corner leads to several courses, checking line, level, and plumb.
Stretch a line between leads and fill the intervening masonry.
Apply mortar uniformly and fully fill bed and vertical joints.
Maintain the specified bond and joint thickness.
Check plumb, level, gauge, and cavity width at frequent intervals.
Tool joints at the correct stage of stiffness.
Install ties, reinforcement, flashings, lintels, and movement-joint materials as the work rises.
Protect unfinished work at the end of each shift.
Chasing, drilling, and cutting should not remove required structural material or interrupt reinforcement, ties, DPCs, or cavity drainage. Service penetrations should be coordinated before construction.
4.3 Stone masonry
Stone should be selected and oriented to respect natural bedding and achieve stable bearing. Large stones should be placed at corners and regularly distributed through the wall. Voids should be filled with properly packed hearting and mortar; excessive small fragments used as wedges can create unstable pockets. Joints should be fully packed but not smeared over the face. Stone veneer requires positive mechanical support or anchorage, not reliance on mortar adhesion alone.
5. Structural action and reinforcement
Masonry is primarily a compression material. Gravity loads should be transferred through continuous bearing surfaces, avoiding eccentricity and local stress concentrations. Walls also experience out-of-plane wind pressure, differential movement, impact, and sometimes seismic or accidental actions. Design therefore considers slenderness, lateral restraint, openings, support conditions, unit and mortar properties, and workmanship.
5.1 Reinforcement
Reinforcement may be placed in bed joints, grouted cores, bond beams, reinforced masonry piers, or lintels. Its functions include resisting tension, controlling cracking, improving continuity, and transferring forces around openings. Reinforcement must be correctly sized, located, lapped, supported, and protected from corrosion. It must not be assumed effective if it is merely placed on top of a joint or left unembedded.
Bed-joint reinforcement commonly consists of longitudinal wires connected by cross wires. It may be used at specified intervals and around openings for crack control. Vertical bars in hollow blocks require clean cores and properly consolidated grout. Reinforced masonry design must follow the relevant code; bar diameter, spacing, cover, lap length, anchorage, and grout strength are design variables, not site guesses.
5.2 Wall ties
Cavity-wall ties connect the leaves sufficiently to transfer lateral forces while allowing each leaf to respond to its own movement. Ties should be corrosion-resistant, correctly embedded, spaced according to design, and installed with a drip or suitable orientation so that water is not conducted across the cavity. Ties should be concentrated and strengthened around openings and at free edges where specified. Mortar droppings must not bridge the cavity or foul the tie drip.
6. Cavity-wall detailing
A cavity wall normally comprises an external leaf, a drained and ventilated cavity, an internal leaf, ties, insulation where specified, and damp-control components. The cavity reduces direct rain penetration and permits drainage. It is not a substitute for good workmanship.
Figure: Typical cavity-wall components; exact dimensions, tie spacing, insulation position, and flashing details are design-dependent.
The external leaf should resist weather while the cavity collects and drains any penetrating water. Flashings are required at the base of cavities, over openings, at roof abutments, and wherever water could be trapped. Flashings should discharge to the exterior through weep holes. The cavity must remain clear of mortar snots, insulation debris, and bridging materials.
Insulation may be partial-fill or full-fill. Its position affects thermal bridging, condensation risk, tie selection, and fire performance. At openings, cavity closers and fire-stopping components must maintain continuity. Fire barriers may be required at floor levels, compartment lines, and around openings, subject to regulation.
7. Damp control and moisture management
Moisture is a major cause of masonry deterioration. Sources include rising ground moisture, penetrating rain, condensation, plumbing leaks, inadequate flashings, and construction water. Damp control is therefore a system rather than a single membrane.
A DPC should be continuous through the wall and connected to floor DPMs, cavity trays, thresholds, and other membranes. Its level should be sufficiently above adjacent finished ground, as required by regulation and detail. At steps, corners, and junctions, laps and seals must preserve continuity. A DPC that is punctured by services or bridged by mortar is ineffective.
Ground levels, paving, render, insulation, and debris must not create a moisture bridge across the DPC. Cavity trays should be sloped toward weep holes. Weep holes should remain open and adequately spaced according to the project detail. Damp-proofing must not be confused with waterproofing: below-ground walls exposed to hydrostatic pressure require a designed tanking, drained cavity, or equivalent system.
8. Openings, lintels, and movement joints
8.1 Lintels
A lintel supports masonry and other loads above an opening and transfers them to the adjacent jambs. Common types include reinforced concrete, prestressed concrete, steel angle or box lintels, and proprietary composite lintels. Selection depends on span, bearing length, wall construction, imposed loads, fire and corrosion requirements, thermal bridging, and installation method.
The lintel must have the specified end bearing on sound masonry, be level, and be adequately propped until the supported masonry and mortar have developed sufficient stability. Openings should be temporarily supported during alteration work. Lintels in cavity walls often require separate support for each leaf or a designed combined system. Flashing and cavity trays above openings must be integrated with the lintel detail, and weep holes must remain unobstructed.
8.2 Movement joints
Masonry changes dimension because of drying shrinkage, moisture expansion, thermal variation, foundation movement, and chemical processes. Movement joints divide a wall into panels and allow controlled movement. Their location depends on material, geometry, exposure, restraint, openings, and the applicable code.
A movement joint should be continuous through the relevant masonry leaf, contain compressible filler where specified, and be sealed with a compatible sealant and backing material. It must not be accidentally bridged by mortar, reinforcement, render, ties, or finishes unless those elements are specifically detailed to accommodate movement. Control joints in concrete blockwork and expansion joints in clay brickwork may have different movement principles; terminology and spacing should follow the governing standard.
Crack control also depends on movement joints at changes in height or thickness, long returns, re-entrant corners, material changes, parapets, and large openings. Joints are not a cure for poor foundations, inadequate lintel bearing, or weak mortar.
9. Quality inspection and testing
Quality control should be planned through inspection and test plans rather than performed only at completion. Typical hold points include foundation readiness, DPC installation, first-course approval, reinforcement and tie inspection, lintel installation, cavity inspection, and final façade review.
9.1 Inspection checklist
Inspectors should verify:
approved units, mortar, reinforcement, ties, flashings, and membranes;
storage, protection, and condition of materials;
line, level, plumb, gauge, bond, and dimensions;
complete filling and correct profile of joints;
clean cavities and correctly oriented ties;
continuity of DPCs, cavity trays, and flashings;
weep holes, vents, fire stops, and cavity closers;
reinforcement location, laps, anchorage, and grout consolidation;
lintel type, bearing, level, temporary propping, and associated drainage;
movement-joint position, width, filler, sealant, and absence of bridging;
protection from frost, rain, rapid drying, and impact.
Checks should be recorded with location, date, responsible person, observations, corrective action, and close-out evidence. Nonconforming work should be assessed before concealment; covering a defect makes corrective work more expensive and less certain.
9.2 Common defects and causes
Cracking may result from foundation movement, drying shrinkage, thermal or moisture movement, inadequate joints, differential movement between materials, or concentrated stress at openings.
Efflorescence is a deposit of soluble salts transported to the surface by moisture. It is often cosmetic, but persistent moisture must be investigated. Prevention includes suitable materials, clean storage, adequate protection, and moisture control.
Spalling may arise from frost action, salt crystallisation, corrosion, or incompatible repairs. Damaged units should be replaced only after the cause is addressed.
Bulging or leaning may indicate inadequate ties, poor bonding, excessive slenderness, foundation movement, or cavity bridging. It can represent a serious safety risk.
Water penetration commonly results from open joints, defective flashings, blocked weeps, cavity bridging, cracked sealants, or inadequate detailing around openings.
Uneven appearance may be caused by inconsistent units, variable mortar colour, poor joint tooling, contamination, or uncontrolled wetting and drying.
10. Worked application: estimating masonry quantity
A rectangular wall is 8.0 m long and 2.7 m high. It contains one door opening 0.9 m wide by 2.1 m high and two windows, each 1.2 m wide by 1.0 m high. The specified brickwork rate is 60 bricks per square metre of net wall area. Estimate the number of bricks before allowing for waste.
Gross wall area:
Ag = L × H = 8.0 × 2.7 = 21.6 m²
Door area:
Ad = 0.9 × 2.1 = 1.89 m²
Total window area:
Aw = 2 × (1.2 × 1.0) = 2.4 m²
Net masonry area:
An = Ag − Ad − Aw = 21.6 − 1.89 − 2.4 = 17.31 m²
Brick quantity:
N = An × 60 = 17.31 × 60 = 1,038.6 bricks
Since bricks are purchased as whole units, the theoretical quantity is 1,039 bricks. If a 5% allowance is adopted for cutting, breakage, and handling loss:
Na = 1,039 × 1.05 ≈ 1,091 bricks
The allowance is a procurement assumption, not a universal rule. Actual requirements should account for bond, closers, returns, piers, damaged units, and supplier pack sizes. The calculation also excludes mortar volume and should not replace a detailed quantity take-off.
11. Applied case: cavity-wall failure at a housing project
Background. An illustrative two-storey housing project developed damp staining below several windows after the first winter. The external brickwork appeared generally plumb and attractive.
Problem. Moisture was found inside the cavity at window openings. Some weep holes were blocked, and mortar droppings formed bridges between the external and internal leaves. Flashing trays were discontinuous at corners, and several wall ties had been installed without the required drip orientation.
Analysis. The brick units and mortar were not the primary cause. The failure resulted from inadequate interface detailing and insufficient inspection before the cavity was closed. Water passing through the outer leaf could not drain freely and was transferred across the cavity by mortar bridges and incorrectly installed ties.
Approach and solution. Selected areas of brickwork were carefully opened. Blocked weeps and mortar bridges were removed, defective flashing was replaced with correctly lapped trays connected to open outlets, and damaged insulation was renewed. Wall ties were supplemented or replaced where required by the engineer. Window reveals were inspected, and a hold-point inspection was introduced before closing each cavity zone.
Outcome. Subsequent water testing showed no recurrence in the repaired areas. The project also revised its inspection plan, requiring photographic records of cavity trays, ties, insulation continuity, and weep holes before concealment.
Learning points. A cavity wall is a drainage system, not merely two parallel walls. Small installation errors can defeat otherwise satisfactory materials. Inspection at concealed-work hold points is more effective than relying on final visual inspection.
12. Sustainability, safety, and contemporary practice
Masonry has long service life and can use locally available materials, but fired products and cementitious binders involve energy and carbon emissions. Responsible selection considers service life, recycled or recovered content where technically suitable, transport distance, repairability, thermal performance, and end-of-life reuse. Lightweight systems may reduce structural dead load, while thermal bridges at lintels, ties, slab edges, and openings require attention in energy-efficient buildings.
Construction safety includes safe manual handling, mechanical lifting for heavy blocks and stone, stable scaffolds, protection from falling objects, cutting controls for silica-containing materials, and safe temporary support during alterations. Dust extraction and suitable respiratory protection are important when cutting masonry. Stone and block stacks must be stable and positioned within safe load limits.
Digital inspection applications, laser levels, BIM coordination, barcode-based material tracking, and photographic records can improve traceability. AI-based image analysis may assist in identifying missing joints, misaligned units, or blocked weeps, but it does not replace competent inspection, code interpretation, or engineering judgment. Data protection and secure project records remain professional responsibilities.
Chapter Summary
Masonry construction is a coordinated system of units, mortar, bonds, ties, reinforcement, supports, joints, and moisture-control components. Bricks, blocks, and stone differ in strength, absorption, durability, weight, and construction method. Bonding distributes load and provides interlock, while mortar must be compatible with the units and exposure rather than simply made as strong as possible. Sound construction requires accurate setting out, full joints, controlled curing, and protection.
Cavity walls depend on a clear drainage path, correctly installed ties, continuous flashings, open weep holes, and coordinated insulation and fire stopping. DPCs and related membranes must remain continuous and free from bridging. Reinforcement, lintels, and movement joints require design-based installation and inspection. Defects such as cracking, efflorescence, spalling, bulging, and water penetration usually reflect interactions between materials, movement, moisture, and workmanship. Planned inspection, particularly before concealed work is covered, is central to durable masonry construction.
Key Terms
Masonry: Construction using units bonded or assembled to form walls or other elements.
Brick: Small fired-clay or similar masonry unit.
Block: Larger concrete, lightweight, or aerated masonry unit.
Ashlar: Regularly shaped stone masonry with relatively uniform courses.
Bed joint: Horizontal mortar joint between masonry courses.
Perpend: Vertical joint between adjacent masonry units.
Bond: Arrangement of units that provides interlock and distributes loads.
Stretcher: Unit laid with its long face parallel to the wall face.
Header: Unit laid with its short end visible on the wall face.
Cavity wall: Wall with separate leaves divided by a drained air space.
Wall tie: Connector between leaves of a cavity wall.
Damp-proof course: Layer that limits moisture movement through masonry.
Flashing: Component that directs water toward a drainage outlet.
Weep hole: Opening that drains water from a wall or cavity.
Lintel: Structural member supporting masonry above an opening.
Movement joint: Deliberate joint that accommodates dimensional change.
Efflorescence: Salt deposit appearing on a masonry surface after moisture evaporation.
Spalling: Loss or breaking away of the masonry surface.
Bond beam: Reinforced horizontal masonry element providing continuity and force transfer.
Cavity bridge: Unwanted material connection that transfers moisture across a cavity.
Review Questions
Short Answer Questions
What are the principal functions of mortar in masonry construction?
Distinguish a stretcher bond from a header bond.
Why must a cavity wall contain open drainage paths and weep holes?
State four items that should be checked before a lintel is concealed.
What is the purpose of a movement joint?
Long Answer Questions
Explain the selection criteria for brick, concrete block, and natural stone in different building applications.
Describe a complete procedure for constructing a brick cavity wall from setting out to protection of unfinished work.
Discuss the causes of water penetration in cavity walls and explain preventive detailing.
Explain how mortar strength, workability, unit absorption, and exposure interact in mortar selection.
Discuss the role of reinforcement, wall ties, lintels, and bond beams in masonry performance.
Analytical / Application Questions
A contractor proposes replacing a specified compatible lime-cement mortar with a very strong cement-rich mortar. Analyse the likely benefits, risks, and information required before approving the change.
A long external blockwork wall has cracks concentrated at re-entrant corners and above openings. Develop a diagnostic sequence and recommend corrective and preventive measures.
During inspection of a cavity wall, mortar droppings are found bridging the cavity and several ties lack drips. Evaluate the likely moisture consequences and prepare a practical corrective-action plan before the wall is closed.
Multiple Choice Questions with Answers
Question 1
Which bond primarily consists of stretchers with staggered vertical joints and is commonly used for a single-leaf cavity-wall leaf?
A. Stretcher bond
B. English bond
C. Header bond
D. Flemish bond
Correct Answer: A. Stretcher bond
Question 2
Why is an excessively strong mortar potentially unsuitable for weak or historic masonry?
A. It always increases water absorption of the units
B. It can concentrate movement and damage the masonry units
C. It prevents mortar from setting
D. It eliminates the need for movement joints
Correct Answer: B. It can concentrate movement and damage the masonry units
Question 3
What is the principal drainage function of a cavity wall?
A. To increase the dead load of the wall
B. To transfer moisture to the inner leaf
C. To collect and discharge water through flashings and weep holes
D. To prevent all air movement through the building
Correct Answer: C. To collect and discharge water through flashings and weep holes
Question 4
A wall has a gross area of 21.6 m² and openings totalling 4.29 m². At 60 bricks per square metre, how many bricks are theoretically required before waste?
A. 1,296
B. 1,091
C. 1,039
D. 773
Correct Answer: C. 1,039
Question 5
Which feature is most important for preventing a wall tie from conducting water across a cavity?
A. A drip or suitable orientation within the cavity
B. A polished external face
C. A thicker bed joint only
D. Placement directly below the DPC
Correct Answer: A. A drip or suitable orientation within the cavity
Question 6
What is the primary function of a lintel?
A. To ventilate the cavity
B. To support masonry above an opening
C. To replace the DPC
D. To bond two unrelated buildings
Correct Answer: B. To support masonry above an opening
Question 7
Which condition is a typical cause of cavity-wall dampness?
A. A clear cavity with open weep holes
B. Correctly lapped flashing
C. Mortar droppings bridging the cavity
D. A continuous internal finish
Correct Answer: C. Mortar droppings bridging the cavity
Question 8
What should an inspection plan normally require before cavity-wall work is concealed?
A. Removal of all wall ties
B. Verification of ties, flashings, insulation, drainage, and cavity cleanliness
C. Painting of the external leaf
D. Filling all weep holes with mortar
Correct Answer: B. Verification of ties, flashings, insulation, drainage, and cavity cleanliness
Question 9
Which statement best describes a movement joint?
A. A deliberate joint that accommodates dimensional change
B. A vertical joint that must always be filled solidly with mortar
C. A replacement for adequate foundations
D. A joint used only for decorative patterning
Correct Answer: A. A deliberate joint that accommodates dimensional change
Question 10
Which practice is appropriate when constructing stone masonry?
A. Use only thin facing stones and leave the core loosely packed
B. Ignore natural bedding planes because mortar carries all tension
C. Provide adequate transverse bonding and properly packed hearting
D. Rely on mortar adhesion alone for stone veneer support
Correct Answer: C. Provide adequate transverse bonding and properly packed hearting