Bjarnes System Krabban
Krabban clip system for insulated standing seam roofs
Krabban for insulated standing seam roofs
Our Krabban system is designed for standing seam roofing on exterior insulated roofs where the fastening needs to work through the insulation layer without damaging the sheet metal. The system combines build-up-specific clips with telescopic sleeves, washers and matching fastening options so the roof can be specified more cleanly from seam type through to substrate.
We use Krabban where the roof build-up calls for a dedicated insulated-roof solution rather than a standard direct-to-substrate clip. That includes 25 mm seams on insulation board, 25 mm seams on roofing felt and welded seams on 20/30 mm board or roofing felt, together with sleeves sized to the insulation thickness and fastening solutions for sheet metal, wood, concrete or lightweight concrete.
What is included in our Krabban system
Krabban for 25 mm seams on insulation board
Choose our Krabban clips for 25 mm seams on insulation board when the roof build-up needs a dedicated insulated-roof fixing with clear options for both fixed and sliding clips. This is the right part of our range when you need to match the seam type first and then decide between galvanised or stainless execution for the project environment.
Krabban for 25 mm seams on roofing felt
Use our roofing felt Krabban clips when the insulated standing seam roof is built around a 25 mm seam on felt rather than insulation board. This subgroup keeps the same fixed-versus-sliding logic as the board version, but it is the better choice when the build-up itself is based on roofing felt.
Krabban for welded seams
Choose our welded-seam Krabban clips when the roof is not specified around a 25 mm seam. This part of our range covers welded seams on 20/30 mm board and welded seams on roofing felt, which makes it the right starting point when the seam geometry is the main factor separating your project from the 25 mm seam systems.
See technical details for our welded-seam Krabban clips on page 41 in the handbook
Sleeves and washers for Krabban
Choose our sleeves and washers as part of the Krabban system, not as an afterthought. Sleeve length matters because the telescopic effect must accommodate compression in the insulation, while the washers support the correct system build-up around the clip and fastening point.
See sleeve lengths, washer details and Krabban accessories on page 44 in the handbook
Fastening screws for the substrate
Start with the substrate when choosing the fastening screw around a Krabban installation. Our handbook separates roof screws for sheet metal and wood from dedicated solutions for concrete and lightweight concrete, which helps you avoid carrying the right clip into the wrong anchoring method.
See fastening screws for insulated-roof installations on pages 37-38 in the handbook
Bits, extenders and drills
Use our bits, extenders and drills when access, reach or thicker sheet metal would otherwise slow down installation. These accessories are especially useful when the Krabban system is being installed across deeper roof build-ups where control and reach matter as much as the clip choice itself.
See installation bits, extenders and drill accessories on pages 45-46 in the handbook
Detailed Krabban data in our handbook
Below you can explore the insulated-roof section of our handbook in more detail. This is where you can compare build-up-specific Krabban clip groups, check whether the project calls for fixed or sliding clips, and review the supporting components around the system.
You can also use the handbook to compare sleeve lengths, washers, fastening screws for different substrates and the accessory tools that support installation. For more demanding specifications, this section works best together with project-specific guidance on movement zones, fastening plans and the surrounding roof build-up.
Page 36 - Krabban system overview for insulated standing seam roofs
Page 37 - Roof screws for fastening to sheet metal and wood
Page 38 - Concrete screws and lightweight concrete screws for insulated-roof installations
Page 39 - Krabban clips for 25 mm seams on insulation board
Page 40 - Krabban clips for 25 mm seams on roofing felt
Page 41 - Krabban clips for welded seams on board or roofing felt
Page 44 - Sleeves and washers for Krabban
Page 45 - Torx bits, telescopic bits and PH2 accessories
Page 46 - Extenders, hammer drill bits and drill accessories for thicker sheet metal
Need help specifying Krabban for a project?
We help contractors, sheet metal specialists and project teams choose the right Krabban clip type, sleeve length and fastening method for the actual roof build-up. That is especially valuable when the key decisions are tied to seam type, movement handling, substrate choice and the environment the roof will face over time.
If you want support with the insulated-roof build-up, the fixed and sliding logic, or the fastening plan around a specific project, our team can help you move from handbook data to a more confident specification.
How do I choose between fixed and sliding Krabban clips?
Choose fixed Krabban clips in the fixed zone, and choose sliding Krabban clips on the remaining roof areas where the sheet metal needs room for thermal movement. The handbook is clear that fixed clips should only be used in the fixed zone, while sliding clips should be used where the roof must be able to move without stressing the sheet or the fastening.
Which Krabban system is right for my insulated roof build-up?
Start with the seam type and roof build-up. Our Krabban range is separated into solutions for 25 mm seam on insulation board, 25 mm seam on roofing felt, and welded seams. That makes the first decision simple: identify the actual roof build-up first, then choose the correct fixed or sliding clip within that subgroup.
Why does sleeve length matter in a Krabban installation?
Sleeve length matters because the insulation can compress under snow and point loads, and the fastening must absorb that movement without damaging the sheet metal. The handbook states that the telescopic effect should be at least 10% of the insulation thickness, and never less than 20 mm. In other words, the sleeve is a core part of the system choice, not just a small accessory.
Can I use one clip spacing everywhere on the roof?
No, not safely by default. The handbook recommends that a fastening plan should be prepared for each individual project, because wind load, roof geometry, seam spacing, substrate and perimeter zones all affect the required clip spacing. On insulated roofs, the fixing pattern is also influenced by the supporting sheet or substrate, so a single universal spacing can easily become the wrong choice.
Should I choose galvanised or stainless Krabban clips?
Choose the clip material according to the corrosion environment and the surrounding roof materials. The handbook specifically ties clip and fastening selection to corrosivity class, and also highlights the importance of metal compatibility where different materials meet. Stainless is not just a premium upgrade; in the right environment it can be the more suitable specification.
Can Unite help us choose the right Krabban setup for a specific project?
Yes. Krabban selection is often about more than choosing a clip code from a table. The right setup depends on roof build-up, seam type, movement handling, sleeve length, substrate and environment. We can help you narrow the correct system and support the fastening logic for the actual roof instead of leaving that interpretation to site guesswork.