PV Roof Kliploks: Match the Profile, Install Correctly

Honor Energy, a professional supplier specializing in PV mounting system accessories. From roof kliploks to matching rails, we offer a full range of onestop solutions. Our kliploks cover angle-type, standing-seam, trapezoidal, and the latest integrated designs, compatible with virtually all mainstream profiled steel sheets on the market, with non-standard customization also available. On the rail side, we stock high-strength aluminium rails and stainless steel connectors in various specifications to meet different load and span requirements. Whether you're an EPC firm, an installer, or the one who actually pays the bills – Honor Energy's got you covered with solid products and fast, no-hassle support.

Now, about roof kliploks: their main job is pretty simple – they bite onto the raised ridges of the steel roof and hold up the whole PV rail and panel system. Let's break it down a bit.
First off, they keep the panels firmly in place. That's the whole point – making sure your modules stay put through rain, wind, or whatever weather comes along.
Second – and this is a big one for angle-type and standingseam roofs – these kliploks don't require a single drill hole. No holes means no leaks. You keep the roof's original waterproofing intact, which is exactly what you want when you're dealing with factory or warehouse rooftops.This makes them well suited for large industrial or warehouse roofs.

Improving wind resistance – Some kliploks are specifically designed as antilift types, providing extra holding power against strong uplift forces in storms.

Accommodating different rib profiles – kliploks can be custom made to suit the exact shape and size of the steel sheet ribs, ensuring a close fit.
Beyond these, kliploks are also used in typhoon-proof systems, antisnowslide devices, and even for fixing decorative aluminium panels on roofs.

Key Features of Roof kliploks

No compromise on waterproofing – This is the biggest selling point. Since no holes are drilled, the original waterproof membrane remains intact. Standing-seam kliploks, in particular, bite directly onto the locked edges, virtually eliminating any risk of leaks.

 

Fast installation – Many components can be pre-assembled in the factory; on site, you simply clip them into place and tighten the bolts. This saves both time and labour.
Lightweight and corrosion-resistant – Most kliploks are made of aluminium alloys (e.g., 6063-T5 or 6005-T5) with an anodised surface finish. They add little extra load to the roof and pass salt-spray tests of 1000 hours or more.

 

But they have drawbacks too – Although non-penetrative, kliploks are not permanently bonded to the roof. Under long-term wind, snow, or seismic loads, they may gradually loosen or even detach. Regular inspections are therefore essential.
Load capacity must be checked beforehand – Profiled steel roofs have limited load-bearing capacity. The additional weight from the PV system must not exceed the original design load. Industry practice suggests roughly 0.15 kN/m² for new loads; in reality, the total weight of panels plus mounting system usually ranges between 20 and 35 kg per square metre. Always obtain the original structural drawings and perform a load verification before installation.

 

Main Types of Roof Kliploks

The choice of kliplok depends entirely on the profile of the steel sheet. Different rib shapes require different kliplok designs.

Angle-type kliploks

Matching roof profile: Angle-type profiled steel sheets (common models: 470, 760, 820, etc.).
Angle-type sheets come with that angled rib – it's a perfect shape for the kliplok to grab onto. Our kliploks have jaws that are designed to bite right onto that rib, and the best part? You don't punch a single hole through the roof. Installation is straightforward: position the aluminium kliplok over the rib and tighten the bolts.
Nowadays, integrated angle-type kliploks are available that eliminate the need for mounting rails altogether – modules can be fixed directly to the kliplok, significantly reducing installation time.

Standing-Seam kliploks

Matching roof profile: Standing-seam profiled steel sheets (common models: 400, 430, etc.).
The ribs of these sheets are raised vertically and interlocked. kliploks simply fasten onto the vertical seam – again, no penetration is required. In real-world projects like the Hefei BOE semiconductor rooftop PV plant, custom-designed standing-seam kliploks were used for the mounting system.

 

Trapezoidal (T-type) kliploks

Matching roof profile: Trapezoidal profiled steel sheets.
Trapezoidal sheets have simple, trapezoid-shaped ribs without the complex locking features of angle or standing-seam types. These ribs do not provide a reliable kliploking point; therefore, the current standard practice is to use self-tapping screws that penetrate the steel sheet and anchor into the purlins underneath.
The downside is obvious – drilling punctures the waterproof layer, creating a potential leak path. For trapezoidal roofs, extra waterproofing measures are critical: install EPDM rubber pads between the kliplok and the steel sheet, and apply weather-resistant structural silicone sealant around every screw hole (which can last over 10 years). In 2023, a typhoon in Nantong toppled 12 PV projects – more than 60% of the failures were traced to corrosion and fracture at the drilled points.

 

Integrated kliploks

This is a newer design that eliminates the mounting rails. The kliplok is integrally formed as a single piece, lightweight and strong. PV modules can be mounted directly onto the kliplok, saving material costs and improving load-carrying capacity.

 

 

Selection and Installation Tips

Match the kliplok type to the roof profile – Angle-type kliploks must not be used on trapezoidal sheets, and T-type kliploks are not suitable for other profiles. Mismatching leads to loosening and leaks.
Don't crank the bolts too hard – we usually aim for 20 to 30 N·m. Go beyond that and you'll crush the steel sheet, which messes up the waterproofing.
And for heaven's sake, don't skip the sealant. That little gap between the kliplok and the roof is exactly where water finds its way in, so fill it properly.
Also, try to avoid working on rainy days. Moisture kills the sealant's sticking power, and that's a recipe for leaks later on.

Last thing – keep up with regular checks. Give the bolts and sealant a once-over every six months, and always do an extra round after a big storm or heavy snowfall.
Don't let their size fool you – kliploks do the heavy lifting. Get the type right and install it well, and you'll have a system that's fast, leak-proof, and reliable. Get it wrong, and you'll pay for it – lower generation, roof damage, or worse, panels coming loose. The trick is simple: match your kliplok to the roof, tighten it properly, and stay on top of maintenance.