Decision guide · 4 min
Clay brick or lightweight concrete block?
Published:
Short answer: Choosing between clay brick and lightweight concrete block depends on structural dead load limits and thermal insulation targets. While traditional bricks are widely available, lightweight concrete blocks significantly lower structural self-weight and offer improved thermal resistance through cellular porosity. Redblok lightweight concrete block operates in the 500–800 kg/m³ design density band, helping reduce frame loads compared to dense masonry. Final selection should always be verified by structural and thermal engineering calculations.
What can be used instead of clay bricks?
Several lightweight masonry alternatives replace clay bricks in modern structural frameworks. These options include lightweight concrete blocks, aerated concrete, and pumice blocks. Note that TÜRKBETON does not produce autoclaved aerated concrete (AAC); it manufactures non-autoclaved lightweight concrete blocks utilizing mechanically generated, stable foam. Structural engineers choose between these systems based on density, laying speed, and local building requirements.
When replacing bricks with lightweight concrete blocks, the uniform internal air voids enhance thermal resistance. Redblok blocks are cured and dimensionally cut in the factory before dispatch. They do not require any site curing. Masons lay the units using traditional mortar or thin-bed adhesive according to manufacturer instructions, allowing cleaner wall profiles and controlled plaster consumption.
Structural weight and dead load calculations
Non-structural infill walls contribute a substantial dead load to reinforced concrete or steel frameworks, impacting foundation sizing and seismic performance under building codes like TBDY 2018 (the Turkish Building Earthquake Code). Normal weight concrete has a dry density of 2,300–2,500 kg/m³ (around 2,400 kg/m³). In contrast, Redblok lightweight concrete blocks are engineered within a 500–800 kg/m³ design density range. For clay bricks, engineers must verify density directly from the relevant manufacturer technical sheets.
Consider an arithmetic calculation for a 100 m² wall with a thickness of 20 cm, resulting in a volume of 20 m³. Utilizing KB500 class lightweight blocks yields an estimated dry mass of 10,000 kg. If KB800 class blocks are chosen, the total dry mass becomes 16,000 kg. By multiplying the measured unit weight of specific brick types by the same volume, site engineers can quantify exact structural dead load differences per floor level.
Thermal conductivity and energy efficiency
Thermal insulation requirements for building envelopes are governed by TS 825 (the Turkish thermal insulation standard for buildings). Furthermore, test procedures for masonry thermal properties are defined under TS EN 1745. Traditional hollow clay bricks restrict heat transfer across their perforations, but mortar joints can create thermal bridges across the facade unless properly addressed.
Foam concrete masonry achieves dry thermal conductivity values ranging between 0.08 and 0.32 W/mK across literature density classes. Within the Redblok product line, KB500 targets 0.12–0.14 W/mK, whereas KB600 targets 0.14–0.17 W/mK, subject to laboratory verification. While standard insulation boards like EPS, XPS, or mineral wool reach 0.03–0.04 W/mK, using lower-conductivity blocks improves overall wall assembly efficiency and helps optimize external insulation thickness.
Decision framework: Selecting the right masonry unit
Project priorities determine whether clay brick or lightweight block provides the appropriate infill solution. A practical decision framework clarifies this trade-off: - Priority on minimizing seismic dead load: Choose Redblok lightweight concrete block (KB500–KB600). - High unreinforced compressive strength focus: Specify Redblok KB800 (target 4.0–6.0 MPa, verified by laboratory test) or load-bearing brick units. - Standard trade familiarity and local brickyard availability: Conventional hollow clay brick. - Dimensional accuracy and surface regularity: Factory-cut lightweight concrete block.
Plaster thickness and finishing techniques also influence selection. Uneven brick surfaces often require thicker base coat render to achieve plumb lines. Conversely, the uniform faces of lightweight concrete blocks enable thinner plaster or direct finishing coats. Regardless of the masonry core selected, exterior faces must be detailed with proper weather-resistant renders to ensure long-term moisture protection.
Frequently asked questions
- Can lightweight concrete blocks replace clay bricks?
- Yes, lightweight concrete blocks can replace conventional bricks in non-load-bearing internal partitions and external infill walls. Operating at densities between 500 and 800 kg/m³, they substantially reduce structural dead loads. Construction details must follow architectural designs and manufacturer guidelines.
- Do lightweight concrete blocks require on-site curing?
- No, Redblok lightweight concrete blocks undergo controlled curing and cutting at the manufacturing plant before delivery. No water curing is conducted on site; jobsite tasks are strictly confined to cutting, laying, and jointing according to structural drawings.
- How do bricks and lightweight concrete blocks compare in thermal insulation?
- Clay brick insulation depends heavily on internal void configurations and thick mortar joints. In contrast, Redblok lightweight concrete blocks target thermal conductivity values of 0.12–0.24 W/mK through uniform microcellular air voids, with definitive performance verified by standard laboratory testing.
Sources and standards
- TS 825: Thermal insulation requirements for buildings
- TS EN 772-1: Methods of test for masonry units - Determination of compressive strength
- TS EN 1745: Masonry and masonry products - Methods for determining thermal properties
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