Brickwork Contractor East Midlands | West Midlands | Vanguard Masonry

On a large housing or commercial project, brickwork defects rarely come from one isolated mistake. More often, recurring snags develop at interfaces: between the design and setting out, the outer leaf and cavity, the brickwork and movement joints, or the masonry and following trades.

Early inspection is therefore more effective than relying on end-of-stage snagging. A site manager or clerk of works should understand what a defect looks like, what may have caused it and which checks can prevent it becoming a repeated problem across several plots or elevations.

This guide covers common defects in new-build brickwork and masonry packages. It is intended as practical site guidance, not a replacement for the project specification, structural design, manufacturer’s instructions, building-control requirements or warranty provider requirements.

Which standards and requirements apply?

It is important to distinguish between different types of guidance:

• Building Regulations are legal requirements. In England, Approved Documents provide practical guidance on meeting those requirements, including structure, moisture and fire safety.
• NHBC Standards are technical requirements for homes covered by NHBC warranty arrangements. They are not legislation, but may form part of the contractual or warranty expectations for a project.
• British Standards and Eurocodes, such as masonry design standards and wall-tie product standards, provide technical requirements or design methods where they are specified or applicable.
• Manufacturer’s instructions apply to proprietary wall ties, cavity trays, lintels, movement-joint materials, cleaning products and other components.
• Good site practice supports quality but should not be treated as a substitute for an approved design or project-specific specification.

The current NHBC Standards should be checked for NHBC-registered housing. For work in England, the relevant Approved Documents and project design information should also be reviewed.

1. Inconsistent or poorly finished mortar joints

What it looks like

Common visual signs include:

• Uneven bed-joint thickness or irregular perpend joints.
• Open, shallow or incompletely filled vertical joints.
• Mortar protruding onto the brick face.
• Inconsistent joint profiles across the same elevation.
• Crumbling, powdery or cracked mortar.
• Recessed joints used where the exposure or specification does not permit them.

Joint defects can affect appearance, weather resistance and durability. They are particularly noticeable around openings, corners, parapets, copings and feature brickwork.

Likely causes

Typical causes include incorrect mortar consistency, excessive drying, poor tooling, rushed work or trying to correct a joint after the mortar has begun to stiffen. Re-tempering mortar with additional water can also affect its performance. Other problems occur when the bricklayer is working from inconsistent gauge lines or when bricks are laid without a properly filled bed.

Prevention and checks

Before work starts, confirm the specified mortar, brick type, joint profile and intended finish. During installation:

• Check that bricks are laid on a full bed of mortar.
• Check that perpends are properly filled.
• Look for consistent joint thickness, alignment and tooling.
• Remove mortar smears before they harden on facing brickwork.
• Confirm that the mortar is being used within the permitted working period and handled in line with the supplier’s instructions.
• Inspect sample panels or the first completed area before repetitive work continues.

For external masonry, NHBC guidance commonly addresses joint thickness, joint profile and the need for consistent workmanship. The exact requirement must be checked against the current standard and project specification rather than assumed from general practice.

2. Missing, misplaced or poorly embedded wall ties

What it looks like

Wall-tie defects are often hidden until an inspection opening or endoscopic survey is carried out. On the finished elevation, possible warning signs may include:

• Cracking near openings, movement joints or unreturned edges.
• Localised bulging or movement of the outer leaf.
• Damp staining associated with cavity bridging.
• Ties visible in the cavity or not properly bedded into both leaves.
• Ties sloping down towards the inner leaf.
• Wall ties contaminated with mortar droppings.

Likely causes

Problems usually result from unclear setting out, ties being omitted around openings, incorrect tie length, poor embedment or ties being installed at the wrong level. Cavity insulation, mortar droppings and other materials can also interfere with the intended cavity arrangement.

Wall ties are structural components. Their type, spacing, embedment, durability and arrangement must follow the design, applicable guidance, product certification and manufacturer’s instructions. Requirements may be linked to Approved Document A, BS EN 845-1 and masonry design provisions, but site teams should not substitute a generic tie pattern for the approved design.

Prevention and checks

Use a cavity-wall inspection checklist at agreed hold points. Check:

• The specified tie type and length have been delivered.
• Ties are installed at the correct levels and locations.
• Ties are properly embedded in both leaves.
• Ties are not angled in a way that could direct water towards the inner leaf.
• Additional ties are provided where required around openings, verges and movement joints.
• Mortar droppings are not creating unintended bridges.
• Cavity trays, insulation and wall ties are coordinated rather than installed in isolation.

Photographic records before the cavity is closed can be valuable evidence of compliance and can reduce later disputes.

3. Movement-joint omissions and cracking

What it looks like

Movement-related defects may appear as:

• Vertical cracks in long elevations.
• Cracking close to re-entrant corners.
• Step cracking around openings or changes in support.
• Cracks where a movement joint was shown on the drawings but not formed.
• Sealant failure or mortar bridging at a movement joint.

Not every crack has the same cause. Settlement, structural movement, thermal effects, moisture movement, lintel movement and workmanship can produce similar patterns.

Likely causes

The most common construction-related causes are incorrect joint location, a joint being omitted, the joint being filled with mortar or rigid finishes bridging it. Poor coordination with cavity trays, wall ties, sealants and adjacent materials can also prevent the joint from working as designed.

Movement-joint spacing and width depend on masonry type, building geometry, exposure, openings and the structural design. Approximate values from another project must not be copied into a new scheme.

Prevention and checks

Before brickwork begins, mark the location of every movement joint on the setting-out information and elevation drawings. Check:

• Joint locations are coordinated with openings and architectural features.
• The joint continues through the required masonry zones.
• Mortar is not allowed to bridge the joint.
• Flexible backing and sealant are installed in accordance with the specification and manufacturer’s instructions.
• Wall ties and cavity components are detailed on both sides of the joint.
• The finished joint is straight, clean and protected from damage.

If cracking is found, record its position, width, length and pattern. Do not simply fill it before establishing whether the joint, support or adjacent detail is involved.

4. Poor setting out, gauge and alignment

What it looks like

Setting-out defects include:

• Courses drifting out of level.
• Openings not aligning vertically between floors.
• Uneven reveals or inconsistent sill heights.
• Brickwork stepping at corners.
• Bond patterns breaking unexpectedly.
• Gables, piers or feature bands not matching the drawings.

These defects are often more visible than minor surface imperfections because they affect the whole elevation.

Likely causes

The underlying cause may be inaccurate control lines, insufficient datum checks, late design changes, poor coordination with windows or lintels, or attempting to absorb dimensional errors through mortar joints. Small errors can accumulate quickly on repetitive housing plots.

Prevention and checks

Set out from verified datums and check the first courses carefully. Before progressing:

• Confirm gridlines, benchmarks and finished floor levels.
• Coordinate brick dimensions with openings, lintels, sills and roof interfaces.
• Check gauge over a full storey rather than relying only on the previous course.
• Use profiles, corner leads and level checks consistently.
• Inspect corners and openings before the work becomes difficult to correct.
• Agree how non-standard cuts, closers and bonding details are to be handled.

A short pre-start review between the brickwork contractor, site manager and relevant design or technical team can prevent repeated dimensional problems across multiple plots.

5. Efflorescence, lime run-off and moisture staining

What it looks like

Efflorescence is usually a white, powdery deposit on the surface of brickwork. Lime run-off may appear as harder white staining below joints, openings or drainage points. Dark staining, damp patches or persistent discolouration may indicate a different moisture problem.

Likely causes

Efflorescence occurs when moisture moves through masonry and deposits soluble salts as it evaporates. It is relatively common in new brickwork, particularly after materials or incomplete walls have been exposed to prolonged wetting.

Persistent staining may instead be associated with:

• Blocked or poorly formed weep holes.
• Cavity trays not draining correctly.
• Mortar droppings bridging the cavity.
• Defective copings, flashings, sills or gutters.
• Incomplete or poorly filled joints.

Prevention and checks

Protect bricks, blocks and unfinished walls from saturation. Keep cavities clear and check that trays, weeps and flashings are installed before they are concealed. Where staining occurs, identify and resolve the moisture source before cleaning. Aggressive chemical cleaning can damage brick faces and mortar joints, so any cleaning method should be approved for the specific masonry and tested in an inconspicuous area.

6. Damage and staining caused by following trades

What it looks like

Typical post-masonry snags include:

• Chipped brick arrises from scaffold or material handling.
• Drill dust, adhesive, sealant or paint on the façade.
• Staining below scaffold ties or temporary supports.
• Damaged corners caused by plant or access equipment.
• Cut-outs that interrupt the bond or leave poorly finished masonry.
• Brickwork cleaned before mortar has adequately matured, leaving colour variation.

Likely causes

Damage often occurs because the handover between trades is unclear. Masons may complete a clean elevation, only for windows, mechanical services, scaffold alterations or external works to create new defects. Inadequate protection and late drilling are common contributors.

Prevention and checks

Agree a trade-interface plan before the elevation is released. Record:

• Which penetrations must be formed during brickwork.
• Who is responsible for sealing and making good.
• When scaffold can be struck or altered.
• How completed brickwork will be protected.
• Which cleaning products and methods are approved.
• How damage will be reported and closed out.

The best snag-prevention process is continuous: inspect materials, setting out, cavities, joints, interfaces and protection as the work progresses, not only when the building is ready for handover.

For developers and principal contractors appointing a brickwork contractor or wider masonry package, clear scope, agreed inspection points and reliable site reporting should be established at tender and mobilisation stage. Vanguard Masonry delivers brickwork and stonework packages for housing, apartments and commercial developments across the Midlands and North West. Contact the team to discuss an upcoming package or tender enquiry.