Metal roofing is known as one of the roof types that is strong, durable, affordable, and relatively easy to install. However, in practice, many cases of leakage or damage in metal roofing are actually not caused by the product itself, but by mistakes during the installation process.

The problem is that many of these mistakes appear trivial and are often considered not too important. In fact, small mistakes during installation can have a significant impact on the roof’s performance in the long term.

Here are several fatal mistakes that often occur during metal roof installation.

1. Roof Slope That Is Not Appropriate

Each type of metal roofing has a minimum slope standard so that rainwater can flow properly.

If the slope is too low, water will more easily be retained on the roof surface. Over the long term, this condition can increase the risk of leakage and accelerate damage to the protective coating.

2. Incorrect Bolt Installation

Bolts are an important component in the metal roofing installation system. However, mistakes in bolt installation still often occur, such as:

• Bolt position is not correct
• Bolts are too tight
• Bolts are too loose

These mistakes can damage the roof’s protective coating or make the connection not strong enough, thereby increasing the risk of leakage.

3. Insufficient Overlap

Overlap is the part where the roof sheets cover each other. If the overlap distance is too small, rainwater can enter through the gap, especially during heavy rain or strong winds.

Improper overlap can also accelerate wear on the joint areas.

4. Ignoring the Quality of the Roofing Product

Another mistake that often occurs is choosing a roofing product based only on price.

In fact, the quality of the base material and the coating greatly influence the roof’s resistance to rust, corrosion, and weather changes.

Roofing products with good material standards will provide more consistent protection in the long term.

The Importance of Choosing Quality Roofing Products

Besides proper installation, product quality also plays an important role in determining roof performance.

Metal roofing products from COMET are designed using high-quality base materials and coatings that have been tested to face tropical climate conditions. This combination helps provide resistance against rust and corrosion for up to 10–20 years

With the right product and installation according to standards, metal roofing can provide optimal protection for buildings in the long term.