Tips for Choosing Quality Bondek So That the Results of the Roof Do Not Curl

In modern construction, bondek is a crucial material for concrete slabs, serving as both permanent formwork and bottom reinforcement. However, not all bondek is of equal quality.
Choosing the wrong type of bondek can cause the slab surface to warp, crack, and even reduce the strength of the building structure. Therefore, it is important to understand the characteristics and how to choose the right bondek.

What is Bondek and Its Function?
Bondek is a corrugated galvanized steel sheet used as a substitute for wooden or plywood formwork in concrete slab casting.
In addition to speeding up the construction process, bondek also increases efficiency and structural strength by serving as bottom tensile reinforcement.

Bondek is commonly used in multi-story buildings, shophouses, modern homes, and multi-story parking areas, due to its strong, neat, and durable results.

Tips for Choosing Quality Bondek
1. Pay Attention to Bondek Thickness
Bondek thickness significantly affects the strength of the slab.
For residential projects, bondek with a thickness of 0.75 mm to 1.0 mm is sufficient.
However, for multi-story buildings or areas with heavy loads, it's best to use a minimum thickness of 1.2 mm to prevent the structure from warping easily.

2. Choose Bondek with a Quality Galvanized Coating
The galvanized coating protects the bondek from corrosion and rust.
Ensure the bondek you choose has a thick and even galvanized coating, as thin-coated bondek will deteriorate more quickly when exposed to humid air or wet cement.

3. Ensure the Bondek's Wave Pattern is Uniform
An uneven wave pattern can cause an uneven cast surface and unbalanced load distribution.
Choose bondek with a precise and consistent wave, as this indicates good production quality and can prevent the deck from warping after the cast dries.

4. Use SNI-Certified Products
Always ensure the bondek you purchase has SNI certification or a quality standard from a trusted manufacturer.
Certified products guarantee that the steel composition, thickness, and tensile strength meet national construction standards.

5. Pay Attention to Sheet Length and Width
Before purchasing, match the bondek size to the floor span length and structural design.
Incorrect sizing can result in too many joints, which can lead to warping in the center area after casting.

6. Buy from a Trusted Supplier
The quality of bondek is also greatly influenced by the product's origin and the distributor's reputation.
Make sure you buy from an authorized supplier selling products from reputable manufacturers with quality assurance and clear after-sales service.

Conclusion
Selecting bondek should not be done carelessly.
By paying attention to thickness, galvanized coating, wave pattern, and product certification, you can get bondek that is strong, even, and durable.
Quality bondek will produce concrete slabs that are precise, do not warp, and are able to withstand loads according to structural calculations.

If you are looking for high-quality bondek, SNI standards, and competitive prices, trust PT Intisumber Bajasakti (ISBS) — a trusted building materials supplier in Indonesia.

📞 Phone: 021-66675999
🌐 Web: intisumberbajasakti.com
✉️ Email: info@intisumberbajasakti.com

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