A quality brick or block wall depends on technique as much as materials—poor laying methods lead to structural weakness, water infiltration, and costly repairs down the line. Whether you're planning a new exterior wall, garden feature, or structural project, understanding professional brick laying techniques helps you hire the right tradesperson and spot quality work. This guide walks you through the methods that separate skilled bricklayers from rushed jobs.
The Foundation: Mortar Mix and Consistency
Mortar is your invisible structural component. Professional bricklayers mix mortar to a specific consistency—roughly the texture of peanut butter, thick enough to hold its shape when troweled but workable enough to compress under brick weight.
Standard ratios vary by application. For general purpose walls, a 1:3 cement-to-sand ratio works well; for more flexible applications like chimneys or areas with movement, bricklayers might use 1:2.25 lime:cement:sand to allow slight give. Mixing too wet creates weak joints that sag and crack; too dry and you won't achieve proper bond and compaction.
Quality bricklayers check consistency before every batch and adjust for temperature and humidity—hot days demand slightly wetter mixes to prevent premature drying.
Bond Patterns: More Than Aesthetics
The pattern you choose affects both appearance and structural integrity. Running bond (offset bricks like a staggered brick pattern) is the most common for single-leaf walls and offers good lateral strength. Flemish bond alternates headers (short end showing) and stretchers (long side showing) and provides superior structural performance, though it's more labor-intensive and commands higher labor rates—typically 15–20% premium over running bond.
For cavity walls (common in residential construction), the outer leaf is usually running bond while the inner blockwork remains hidden. The cavity itself—typically 50–100mm—allows moisture to drain and reduces thermal bridging.
Laying Technique: The Skill Element
Professional bricklayers work to a consistent height line, using a string or laser level to ensure horizontal alignment. Vertical joints—called head joints—need full mortar coverage; pressing each brick firmly compresses the mortar, removing air pockets that weaken the wall.
Key steps a professional follows:
- Butter (apply mortar to) the end of each brick before placing
- Press the brick firmly downward and inward against the previous one
- Strike excess mortar immediately while workable (typically within 30 minutes)
- Check plumb (vertical) and level on every 4–5 courses
- Maintain consistent joint width—typically 10mm for aesthetic appeal and structural performance
Rushed work shows as inconsistent joint widths, hollow-sounding bricks (sign of air pockets), or visible gaps where mortar wasn't fully pressed.
Blockwork Considerations
Concrete blocks require slightly different handling than bricks. They're heavier (typically 17–26kg depending on size and density), so professionals use a firmer mortar mix to prevent crushing. Block layers often work faster than bricklayers—expect roughly 50–80 blocks per day for a skilled tradesperson versus 300–500 bricks daily for brickwork.
Hollow block cavities must be fully grouted in structural applications, and horizontal reinforcement is often bedded in mortar courses on longer walls to prevent cracking from settling or wind loading.
Pointing and Finish
Joint finish isn't just cosmetic. A concave joint (struck with a specialized jointer tool) sheds water better than a flush or weathered joint. This detail directly impacts wall longevity—poor pointing allows water into the mortar core, where freeze-thaw cycles cause deterioration.
Professional bricklayers repoint or finish joints before mortar fully hardens, roughly 1–2 hours after laying. Attempting to point dry mortar produces weak results and crumbly joints.
What to Expect from a Professional
A skilled tradesperson will discuss bond pattern, mortar specification, and pointing style upfront. They'll protect existing structures and adjacent surfaces, work to building regulations, and carry appropriate insurance. Labor costs typically range £150–300 per day for solo bricklayers in the UK, with day rates varying by region and complexity.
If you're comparing quotes, look for specific details: Do they mention mortar mix ratios? Can they explain their joint finish choice? Do references mention quality and reliability? Platforms like Mercoly let you compare and find trusted brick laying providers in one place, making it easier to spot professionals worth hiring.
Frequently Asked Questions
Q: How long does mortar take to set, and when can I apply load? Full mortar strength develops over 28 days, but bricks can typically bear load after 7 days in normal conditions; professional bricklayers account for this in phasing tall walls.
Q: Should I hire someone by the day or by the square meter? Square meter rates (typically £45–80/m² for brickwork) are clearer for customers, though experienced bricklayers may prefer day rates; ensure quotes specify materials included.
Q: What causes horizontal cracks running through mortar joints? Usually foundation settlement or inadequate reinforcement in longer walls; a professional survey identifies the root cause before repairs.
Compare qualified brick laying professionals on Mercoly to find the right fit for your project.