How to Avoid Problems When Installing Metal Roofing Tiles

Why Proper Installation Matters

Metal roofing tiles are among the most popular roofing solutions in Europe — lightweight, durable, and aesthetically pleasing. Manufacturers often claim a lifespan of 50 years or more, but this is only true if the material is installed correctly.
Improper installation can lead to leaks, corrosion, sheet deformation, and even panels being torn off during storms. In fact, nearly one-third of issues with this type of roofing are caused by fastening mistakes.

Step 1: Preparing the Base

The batten system is the backbone of your roof. Its quality determines the stability and appearance of the finished structure.

Use dry, seasoned coniferous timber with low moisture content.
The standard cross-section is 100x30 mm, but dimensions may vary depending on rafter spacing and snow loads.
Leave a gap of 10–15 mm between boards for ventilation and thermal expansion.
The first batten near the eaves should be raised by about 50–70 mm so that rainwater flows into the gutter instead of dripping onto the fascia.

Remember: a strong, well-laid batten system is half of the job done.

Step 2: Choosing the Right Fasteners

Ordinary screws won’t do. Metal tiles require special roofing screws with washers and an EPDM rubber gasket to ensure tight, weatherproof connections.

For wooden battens: 4.8×35 mm screws.
For metal framing: 4.8×19 mm self-drilling screws.
Screw heads are usually painted in the color of the roofing to blend in aesthetically.

Do not mix wood screws with metal screws — their threading and tips are different.

Step 3: Fastening Technique

Always use a screwdriver/drill with torque control.
Drive screws perpendicular to the sheet surface.
The rubber washer should be slightly compressed, but not squashed or deformed.
Over-tightening is just as damaging as under-tightening.

Step 4: Fastening Layout

Bottom edge: screws in every wave.
Sheet field (middle): staggered placement, 300–500 mm spacing.
Side overlaps: screws every other wave at the top of the overlap.
Ridge and edges: denser fastening, 200–300 mm spacing, as these areas face the highest wind loads.

On average, you’ll need 6–9 screws per m², depending on the tile profile and local wind conditions.

Step 5: Overlaps and Additional Elements

For longer slopes, sheets must overlap by at least 150 mm. Place sealing tape or EPDM strips between sheets, then fix the overlap with screws through the crest of the wave.

Finishing elements include:

Ridge caps,
Valleys,
Eaves and verge trims.

These are fastened every 300–500 mm, always at the top of the wave to prevent water retention.

Common Mistakes and Their Consequences

Incorrect batten spacing
– Leads to sagging and sheet deformation.
Too few screws
– Weak fixation, panels may lift or rattle in the wind.
Over-tightening screws
– Damages the washer, causing leaks and rust.
Skipping sealants and gaskets
– Water seeps into joints, especially near chimneys and valleys.
Placing screws at the bottom of the wave
– Water collects around the screw → accelerated corrosion and leaks.

Conclusion

Installing metal roofing tiles may seem simple, but it requires precision and attention to detail. Even a small mistake can reduce the lifespan of your roof by decades.

So, remember:

Don’t cut costs on fasteners and accessories.
Follow the proper installation guidelines.
If you lack experience — hire professionals.

This way, you’ll secure a roof that resists leaks, corrosion, and deformation, protecting your home reliably for half a century or more.

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