Thursday, 24 September 2026
When building or renovating a house, the roof or floor slab is something that should not be chosen carelessly. In Indonesia, this part of a house is commonly known as a dak. It can become the upper floor of a house, a roof structure, or a divider between two floors.
Different materials can be used to make a dak, and each one has its own advantages and limitations. So, before choosing one for your home, it is useful to understand the basic options.
Concrete Dak
Concrete is probably the most familiar material for making a dak. It usually combines cement, sand, gravel, water, and steel reinforcement. A wooden formwork system is normally used to hold the concrete while it is being poured and hardened.
One of its biggest advantages is strength. Concrete is also a common choice for modern minimalist houses. However, the process takes time because the concrete needs to harden properly before the construction can continue. According to Archify, this can take around 20 to 25 days.
Steel Plate Dak
Steel plate is another option for a house dak. As the name suggests, this system uses metal plates as the main material. One advantage is that installation can be faster than conventional concrete because it does not require the same type of wooden formwork.
Steel plates are also lighter than concrete. However, homeowners need to consider the possibility of deflection or bending, so proper planning and installation are important.
Keraton Dak
Keraton dak uses specially shaped clay blocks that are arranged to form the floor structure. The modules are usually placed between supporting structures before the finishing layer is added.
One interesting advantage is that this type of dak can help make a building feel cooler and can also provide sound insulation. Archify notes that a keraton dak can support significant loads when built according to the recommended thickness and span.
However, the material needs careful handling. The modules should not simply be drilled or damaged during installation because this can affect the strength of the structure.
Bondek Dak
Bondek is another popular option, especially for modern construction. It uses a combination of metal materials, including galvanized steel, as a permanent formwork or base for concrete.
One benefit is that bondek provides a strong base for concrete and can reduce the need for temporary supports compared with traditional wooden formwork. It can also make the construction process more efficient.
However, the initial cost can be higher, and installation should be handled properly by experienced workers.
So, Which Dak Is Suitable for Your Home?
There is no single material that is perfect for every house. Concrete may be suitable when strength and conventional construction are priorities. Steel plates can be considered when lighter and faster construction is desired. Keraton can offer additional thermal and acoustic benefits, while bondek can make the concrete casting process more practical.
The choice should depend on the size of the building, structural requirements, budget, construction method, and the advice of a qualified professional. The quality of the materials and installation is also extremely important.
Before starting construction, it is a good idea to discuss the plan with an architect or structural engineer. A properly planned dak is not only about appearance. It is an important part of making your home safe, strong, and comfortable for the long term.