How much mortar do I need per 1000 bricks in South Africa?

For every 1000 standard stock bricks (222×106×73mm) using a 1:4 cement:sand mix, you need approximately 3–4 bags of 50kg cement and 0.45–0.55m³ of building sand. For 1000 maxi bricks (290×140×90mm), the larger joint volume increases this to approximately 4–5 bags of cement and 0.55–0.65m³ of building sand. These quantities assume a standard 10mm mortar joint.

What is the difference between mortar sand and plaster sand in South Africa?

Mortar (brickwork) requires building sand — also called coarse sand or sharp sand. It has angular particles that produce a stronger mechanical bond between bricks. Plaster sand (fine-grained, rounded particles) is used for wall plastering — not for mortar. Using plaster sand in mortar produces a weak joint with poor strength. Always specify building sand when ordering for brickwork mortar.

How do I mix mortar correctly for brickwork in South Africa?

Measure cement and sand by volume using a consistent container (typically a builders wheelbarrow or bucket). Mix dry ingredients first until uniform colour is achieved. Add water gradually — the mix should be firm but workable. Over-wet mortar (soupy or sloppy) is weak and causes staining. Under-wet mortar crumbles. Correctly mixed mortar will hold its shape when squeezed in your fist but not squeeze water.

How much does building sand cost per bulk bag in South Africa?

Building sand in South Africa typically costs R200–R350 per bulk bag (0.75m³) in 2026, varying by province and delivery distance. Gauteng and the Western Cape tend to be cheaper due to more suppliers. Free delivery usually applies above a minimum order — confirm with your supplier. For large projects, buying by the ton directly from a sand quarry is more economical.

Mortar Calculator South Africa — Cement & Sand Per Wall

🪣 Last Updated: May 2026 · SA Mortar Mix Ratios & Brick Standards

🪣Mortar Calculator — Choose Your Input Method

Calculate from

Wall Area (m²)Net wall area to be laid

Number of BricksTotal bricks to be laid

Brick Type

Wall Type

Mortar Mix Ratio

Wastage Factor

🪣 Cement Required (inc. wastage)

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Mortar Volume

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Building Sand (m³)

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Sand (bulk bags)

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Bricks (area method)

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Mix Ratio Used

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Cement Per 1000 Bricks

⚠️ For planning purposes only. Consult a registered contractor for structural brickwork specifications.

Mortar Quantities for SA Brickwork — The Full Guide

Mortar is the binding material between bricks and is one of the most underestimated material costs in any brickwork project. Many people calculate bricks correctly but forget to budget properly for the cement and sand that holds them together. This calculator gives you accurate mortar quantities based on actual SA brick sizes and a standard 10mm mortar joint.

Mortar Quantities Per 1000 Bricks — SA Reference Table

Brick Type	Mix Ratio	Cement (50kg bags)	Building Sand	Application
Stock / Face (222×106×73mm)	1:4	3.5–4 bags	~0.50 m³	General brickwork
Stock / Face (222×106×73mm)	1:3	4.5–5 bags	~0.45 m³	Exposed / boundary walls
Maxi brick (290×140×90mm)	1:4	4.5–5 bags	~0.65 m³	General brickwork
Maxi brick (290×140×90mm)	1:3	5.5–6 bags	~0.60 m³	Exposed / boundary walls

Mortar Volume Formula

Formula (Area Method)

Mortar volume (m³) = Wall area (m²) × mortar factor × skin multiplier Stock brick mortar factor: 0.025 m³/m² (single skin) Maxi brick mortar factor: 0.030 m³/m² (single skin) Cement bags = Mortar vol ÷ (ratio+1) ÷ 0.033 Sand (m³) = Mortar vol × ratio ÷ (ratio+1)

Which Mortar Mix Ratio Should You Use?

1:3 mix (strong): Use for boundary walls, retaining walls, areas exposed to driving rain, and any brickwork below DPC (damp-proof course). Stronger but stiffer to work and more prone to shrinkage cracking.

1:4 mix (general): The most commonly used ratio in South Africa for standard residential and commercial brickwork. Good balance of strength and workability. Appropriate for most above-DPC applications.

1:6 mix (weak): Use only for internal, non-load-bearing partition walls not subject to weather. More workable but significantly weaker — not appropriate for external or structural work.

Why Mortar Quality Matters

Mortar that is too wet (over-watered) is one of the most common mistakes in SA brickwork. Over-wet mortar produces staining on face bricks, weak joints, and increased shrinkage cracking. The correct mortar consistency holds its shape when squeezed but does not squeeze out water. Mix only what you can use in 1–2 hours — do not add water to mortar that has started to stiffen.

Frequently Asked Questions

How much mortar per 1000 bricks in South Africa?

For 1000 standard stock bricks using 1:4 mix: approximately 3.5–4 bags of 50kg cement and 0.5m³ of building sand. For maxi bricks: 4.5–5 bags and 0.65m³ sand. These include 10mm mortar joints.

What is the correct mortar mix ratio for brickwork in SA?

1:3 for exposed, boundary and below-DPC work. 1:4 for general purpose brickwork — the most common choice. 1:6 for internal non-load-bearing partition walls only. Richer mixes are stronger but more prone to shrinkage cracking.

What is the difference between mortar sand and plaster sand?

Mortar requires coarse building sand (angular particles for bond strength). Plaster sand is fine-grained and produces weak mortar. Always specify building sand (coarse) for brickwork mortar — confirm with your supplier.

How do I mix mortar correctly for brickwork?

Mix cement and sand dry until uniform colour, then add water gradually. Correct consistency: holds shape when squeezed but does not squeeze out water. Do not add water to mortar that has started to stiffen. Mix only what you can use in 1–2 hours.

How long does mortar take to set in South Africa?

Initial set: 2–4 hours. Full working strength: 7 days. Design strength: 28 days. In hot dry SA conditions, mortar dries too quickly — keep new brickwork shaded and damp for 3–7 days. Do not lay bricks in direct midday summer sun.

Should I use a plasticiser in mortar in South Africa?

A mortar plasticiser (such as Febmix or lime) improves workability without adding excess water. This is especially useful in hot conditions where mortar stiffens quickly. Use according to manufacturer instructions — typically one capful per 50kg cement bag. Do not substitute washing-up liquid — it weakens mortar significantly despite being a common site practice.

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Mortar & Cement Mix Calculator — South Africa