Steel purlins carry more responsibility than most people think. They support roofing sheets insulation loads and wind forces. When purlins are selected or installed incorrectly problems show up fast especially in Qatar weather.

What purlins actually do

Purlins transfer roof loads to the main steel structure. They keep roofing sheets aligned and prevent sagging. If spacing thickness or fixing is wrong the roof system starts to fail even if the main structure is strong.

Common mistakes seen on sites

• Wrong purlin thickness selected to save cost
• Excessive spacing between purlins
• Improper fixing to rafters or beams
• Using non galvanized purlins in outdoor roofs

Why spacing matters

Each roofing profile has a maximum purlin spacing. Exceeding it causes sheet vibration oil canning and noise during wind. Over time fasteners loosen and leaks appear. Proper spacing improves roof life and safety.

Galvanization and orientation

In Qatar galvanized C and Z purlins are preferred due to humidity and heat. Orientation matters too. Incorrect overlap direction allows water to sit on joints which leads to corrosion even on galvanized steel.

Installation checks contractors should follow

• Confirm purlin gauge and coating before installation
• Maintain correct spacing as per roof design
• Use proper bolts and washers for fixing
• Check alignment before fixing roofing sheets

Mega Steel practical approach

Mega Steel Company supplies C and Z purlins fabricated for Qatar projects. We guide clients on selection spacing and correct installation practices so the roof system performs as designed. Strong roofing starts with properly installed purlins not just good sheets.