Common Mistakes When Installing Corrugated Iron and How to Avoid Them

Corrugated iron is a roofing material widely used in various types of buildings due to its easy installation, affordable price, and good weather resistance. However, many errors are common during installation. Even a small mistake can cause leaks, the roof can easily come off during strong winds, and even shorten the roof's lifespan.

To ensure a safe installation and maximize results, here are some common mistakes when installing corrugated iron and how to avoid them.

1. Installing Iron Without the Proper Slope
The most common mistake is a roof slope that is too shallow. A roof with a slope less than the standard one impedes water flow and increases the risk of leaks.

Solution:

• Use a minimum slope of 15°–25° to ensure water flows smoothly and prevents pooling.
• Adjust the slope to suit the rainfall conditions in your area.

2. Too Little or Uneven Overlap
If the overlap is too small, rainwater can seep through the gaps between the sheets. If it is too large, material is wasted and the structure looks untidy.

Solution:

• The standard horizontal overlap is approximately 1–1.5 waves and the vertical overlap is at least 20–30 cm.
• Ensure the sheets are aligned before installing screws.

3. Using the Wrong Screws or Nails
Incorrectly selecting screws/nails can cause the zinc sheeting to sway, tear, or leak due to loose installation.

Solution:

• Use roofing screws with rubber (neoprene) washers for waterproofing.
• Avoid regular nails, which can easily loosen due to wind and rain vibrations.

4. Installing Screws at the Wrong Point
Many people install screws at the crest of a wave. This can potentially cause the zinc sheeting to crack or leak.

Solution:

• Install screws at the valley (bottom) of the wave, not the crest.
• Make sure not to overtighten to avoid dents.

5. Not Using a Strong and Level Support Frame
An uneven or sparse frame can cause the zinc sheeting to swing or make noise in the wind.

Solution:

• Use a maximum frame spacing of 80–120 cm, depending on the thickness of the corrugated iron.
• Ensure the frame is completely level before installation begins.

6. Cutting the corrugated iron with the wrong tools
Cutting with a grinder often causes the edges of the corrugated iron to heat up, burn, and damage the protective coating, making it prone to rust.

Solution:

• Use tin snips or a shear machine for clean, safe cuts.
• Avoid using a grinder unless absolutely necessary.

7. Not Using Additional Roof Accessories
Not using a ridge cap or flashing can cause leaks at the joints.

Solution:

• Install the ridge cap at the peak of the roof and flashing at the side walls or corner joints.
• Use a quality sealant for extra security.

Conclusion
The success of a corrugated iron installation is determined not only by the quality of the materials, but also by the installation technique. Avoiding the common mistakes above will increase the strength of the structure, extend the life of the roof, and prevent leaks and premature damage.

To ensure a neat, safe, and durable installation, use quality materials and follow proper installation standards.

Need Quality Corrugated Iron and Ready for Technical Consultation?
PT Intisumber Bajasakti provides corrugated iron in various thicknesses and specifications to suit your project needs. Please contact our team for information and ordering.

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

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