Building a partition, an extension or a new wall? Here is how the three common Malaysian wall blocks compare on weight, water, cracking and fixings.
For most Malaysian homes, cement sand brick is the everyday choice for ground-floor partitions and fences, clay brick is the dense, forgiving traditional option, and lightweight AAC block is the choice when weight or speed matters, such as upper floors and condos. AAC is roughly a third of the weight of solid clay brick but softer, needs a protective render outdoors and special anchors for heavy cabinets. Cement products shrink, so long walls need movement joints and careful plastering to avoid hairline cracks.
Walk past any renovation in the Klang Valley and you will see one of three materials going into the new wall. The red clay brick (bata merah) is the traditional choice in older terraces and shophouses. The pale grey cement sand brick (bata simen) is what most local builders use for everyday partitions, fences and extensions. And the large, light, white-grey AAC block (autoclaved aerated concrete, often just called bata ringan or lightweight block) has become common in newer condominiums and commercial buildings.
All three make a solid masonry wall that is plastered and painted, so once the job is finished they look the same. The differences show up in the weight the floor has to carry, how the wall handles water, how likely it is to crack, and what you can hang on it. This guide compares them honestly so you can choose, or at least ask the right questions when a contractor proposes one.
A clay brick is shaped from clay and then fired in a kiln at 900–1,000 °C, which is what gives it its strength. The result is a hard, dense unit: a solid clay brick weighs in at around 2000 kg/m³. Hollow and frogged bricks weigh less, but even they are the heaviest option on this page.
A typical internal wall in brick is a half-brick wall: one brick thick, plastered on both sides. A live ClickBina guide puts a standard half-brick partition at about 150mm with the plaster, and a single-brick wall at 115 mm.
A cement sand brick is not fired at all. It is made from a dry, fine concrete mix pressed into steel moulds by vibration and compaction, then cured rather than baked. It comes out pale grey and is a low-cost unit that every local supplier stocks, which is why so many partitions, extensions and fences are built with it.
AAC is a concrete that is foamed with millions of tiny air bubbles and then steam-cured in an autoclave. Depending on the density, up to 80% of a block is air. That is why it is so light: the reference range is 450–850 kg/m³, and one Malaysian maker lists its blocks at 550–650 kg/m³ — roughly a third of a solid clay brick. The same maker sells standard blocks 600 x 200 (mm) on the face and says each block is equivalent to 7 pieces of common brick, so a wall goes up quickly.
| Point | Clay brick | Cement sand brick | AAC block |
|---|---|---|---|
| How it is made | Clay fired in a kiln at 900–1,000 °C | Dry concrete mix pressed in moulds, cured | Foamed concrete, steam-cured in an autoclave |
| Density | Around 2000 kg/m³ (solid) | Dense concrete; heavy | 450–850 kg/m³ |
| Unit size | Small, many units per wall | Small, many units per wall | Large; one maker's block equals 7 common bricks |
| Speed to build | Slow | Slow | Fast |
| Strength and surface | Hard | Hard if well made | Softer; about 50% of regular concrete's compressive strength |
| Water | Porous; can show efflorescence | Porous; tolerates wet areas if made with enough cement | Absorbs moisture; needs a protective finish outdoors |
| Cracking risk | Low in the unit itself | Shrinks; needs movement joints on long runs | Shrinkage cracks possible, especially in humid conditions |
| Heavy fixings | Standard plugs and screws | Standard plugs and screws | Needs anchors designed for AAC |
Weight is the reason AAC exists. A new wall on a ground-floor slab of a terrace house sits on the ground, so a clay or cement brick wall is rarely a concern. A new wall on an upper floor, a mezzanine or a condo slab is different: the slab was designed for a certain load, and a long brick partition adds a lot of it. Because AAC is so much lighter, it reduces the load on the structure, which is why designers reach for it in high-rise buildings and upper-floor partitions.
None of these three blocks should be treated as structure in a home renovation. In Malaysian houses the frame (columns, beams and slabs) carries the building and the brick or block wall fills the gaps. If a wall has to carry a load, or if you are adding a room or a floor, that is a job for an engineer's design and the council's approval, not a choice of brick. For what happens when an old wall comes out, see the wall hacking guide.
All three materials are porous to some degree, and in Malaysian weather that matters more than strength. Clay brick soaks up water and dries out again; the problem is the salts it carries to the surface, which appear as white powder. The efflorescence guide explains that one. At the base of older walls with no damp-proof course, all masonry can wick moisture up from the ground — see rising damp.
AAC needs the most care outdoors. Its fine air voids absorb moisture, so external AAC walls need a protective render or coating. The makers sell dedicated renders for exactly this reason. Inside a home it is fine behind normal plaster and paint, but in a bathroom the wall should be waterproofed before tiling, as with any masonry wall.
Fine cracks in a new wall are the most common complaint after a renovation, and they usually come from shrinkage, not from a weak material. Cement products, including cement sand brick and AAC, shrink as they dry. Long straight walls, walls that meet a concrete column with no tie or mesh, and walls plastered too soon are where the cracks appear.
This is the question that catches owners out after moving in. A wall-hung kitchen cabinet, a TV bracket or a storage water heater puts a heavy pull on a few screws.
| Wall | Light items (frames, clocks) | Heavy items (cabinets, TV, water heater) |
|---|---|---|
| Clay brick | Ordinary plugs | Ordinary plugs and screws of the right length; avoid drilling into a mortar joint |
| Cement sand brick | Ordinary plugs | Ordinary plugs and screws; check the brick is sound, not crumbly |
| AAC block | Ordinary plugs may work | Long screws and wall anchors designed for AAC; drill with a high-speed steel bit without hammer action |
If you already know where the heavy items will go, say so before the wall is built. On AAC, the installer can plan fixings or build in a solid section at that spot; on any wall, it saves drilling into a hidden pipe or cable later.
| Job | Usual choice | Why |
|---|---|---|
| Room partition, landed house ground floor | Cement sand brick or clay brick | Solid, familiar to every builder, easy to fix things to |
| Partition on an upper floor or in a condo | AAC block, or a lightweight gypsum wall | Much less load on the slab; quicker to build |
| Wet kitchen or bathroom wall | Cement sand brick or clay brick | Handles repeated wetting; waterproof before tiling |
| Extension wall on new foundations | Cement sand brick, clay brick or AAC | Any works if designed properly; exterior AAC needs a protective render |
| Boundary or fence wall | Cement sand brick or clay brick | Takes weather and knocks; movement joints on long runs |
| Wall that must be quiet | A dense brick wall, or a built-up lining | Mass helps block airborne noise |
If you do not need masonry at all — for example a TV wall or a quick room divider in a condo — a framed board wall may suit better; the false wall guide covers that. For noise, the wall soundproofing guide explains why mass alone is not the whole answer.
ClickBina is an experienced KL & Selangor contractor for whole-house refurbishment, and new partitions, extension walls and the plastering, waterproofing, tiling and painting that follow are part of that work. We coordinate the trades so the wall, the wiring and plumbing chases, the plaster and the finish are done in the right order. Whoever builds your wall, get the block type and the wall thickness written on the quotation so you know what you are paying for. Our price is flat, with no hidden charges. A site visit is RM150, waived if you go ahead. WhatsApp us your job details and we reply within the hour.
Densities, firing temperature, the curing of concrete bricks and the movement-joint spacing are from the Wikipedia article on brick. AAC air content, strength, water sensitivity, shrinkage cracking, thin-bed mortar and fixing advice are from the Wikipedia article on autoclaved aerated concrete. The salt mechanism is from the Wikipedia article on efflorescence. The block size, the brick equivalence and the 550–650 kg/m³ density are manufacturer data from a Malaysian AAC maker (standard block data and product claims), quoted as the maker's own figures. Wall thicknesses are from existing ClickBina guides. This page publishes no prices, because the cost of a wall depends on its height, length, openings and finish, and is quoted after a look at the site.
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