Bjarnes System accessories
Bjarnes System accessories, bits and drills for insulated roof installation
Accessories that complete the Krabban installation set-up
Our Bjarnes System accessories range is built for standing seam roof installation on externally insulated roofs, where the right sleeve, bit, extender or drill has a direct impact on fit, reach and installation quality. This is not a generic add-on range. It is the accessory layer that supports the Krabban system in real project conditions.
Here you can orient yourself between Krabban sleeves and washers, Torx and PH bits, bit and drive extenders, and drills for steel and concrete-related installation work. The handbook below also helps you match the accessory set-up to insulation thickness and substrate, so you can choose faster and avoid unnecessary rework on site.
What is included in our Bjarnes accessory range
Krabban sleeves and washers
Choose our Krabban sleeves and washers when insulation thickness and telescope effect need to be controlled instead of improvised on site. This is the right part of the range when the accessory decision is driven by roof build-up, compression control and correct Krabban installation rather than by the clip itself.
See sleeve sizes, washer details and Krabban accessory data on page 44 in the handbook
Torx bits for Bjarnes installation work
Use our Torx bits when you need the correct drive option for Bjarnes installation work, from shorter standard bits to telescopic Torx 25 options for longer reach. This is the better choice than adapting a generic bit when access, depth or extender compatibility matters to the installation flow.
See Torx bits, telescopic bits and BT25 extension-related details on page 45 in the handbook
PH2 bits for Clipdriver DF
Choose our PH2 bits for Clipdriver DF when the installation method is built around CDDF and you need the correct bit length and machine fit from the start. This subgroup is distinct from the Torx range because it is tied to the Clipdriver workflow and the listed Festool and Fein-compatible options.
See PH2 Clipdriver DF bit options and machine-fit details on page 45 in the handbook
Extenders and drills for reach and substrate
Use our extenders and drills when the roof build-up is too deep for a basic set-up or when substrate conditions call for a more specific drilling solution. This part of the range covers bit extension, drive extension, hammer drills and the steel drill used where the decking profile is thicker than 2.5 mm.
See extenders, hammer drills and steel-drill details on page 46 in the handbook
Detailed Bjarnes accessory data in our handbook
The handbook below is where you can compare the accessory range in a practical way: sleeves and washers for Krabban, Torx and PH bits, bit and drive extenders, and drills for steel and concrete-related installation work.
It is also worth checking the combination tables after the main accessory pages. They help you match insulation thickness, reach and substrate to the right sleeve, bit, extender and screw combination before installation starts.
Page 44 - Krabban sleeves and washers
Page 45 - Torx bits, telescopic bits and PH2 bits for Clipdriver DF
Page 46 - Bit extenders, drive extenders, hammer drills and steel drill for thicker decking profiles
Page 48 - Combination table for telescope steel and wood installations
Page 49 - Continued steel and wood combination table for thicker build-ups
Page 50 - Combination table for telescope concrete installations
Page 51 - Continued concrete combination table for thicker build-ups
Need help choosing the right Bjarnes accessory set-up?
We help contractors, tinsmiths and project-led teams choose the right sleeve length, bit, extender and drill set-up for the actual roof build-up. That means fewer assumptions on site and a faster path to the right Bjarnes System installation.
How do I choose the right sleeve length for Krabban?
Start with the insulation thickness and the required telescope effect. The right sleeve is the one that matches the build-up and lets the Krabban installation work as intended, not the one that merely seems close enough on site. The combination tables in the handbook are the fastest way to match sleeve, bit, extender and screw to the installation depth you actually have.
When should I use TEBT4, and when do I move to BT25 with BFL750?
Use TEBT4 for the standard telescopic set-up across much of the thickness range, and move to BT25 with BFL750 when the build-up gets thicker and you need more reach. In practice, this is a reach-and-access decision, not just a tooling preference, so it should follow the handbook’s combination logic rather than habit.
Do I need the BFS steel drill for every installation?
No. The BFS steel drill is relevant where the decking profile is thicker than 2.5 mm. If that condition does not apply, you should not assume it belongs in every set-up. This matters because over-specifying tools slows installation and under-specifying them can create avoidable problems on site.
What is the difference between a bit extender and a drive extender?
A bit extender extends the bit set-up, while a drive extender is used where the drilling side of the installation needs extra reach. The difference matters once the roof build-up gets deeper, because using the wrong extension approach can make the installation awkward even if the fastening choice itself is correct.
Do I need special bits for Clipdriver DF?
Yes, when the installation method is based on Clipdriver DF, you should use the listed PH2 options that match that workflow rather than rely on a general-purpose substitute. The handbook identifies different CDDF bit lengths and machine-fit options, which helps avoid a poor fit between tool, machine and installation method.
Can Unite help us choose the right accessory combination for a project?
Yes. When insulation thickness, substrate or reach makes the set-up less obvious, we can help you narrow down the correct sleeve, bit, extender and drill combination before work starts. That is often the fastest way to avoid site improvisation and get a cleaner installation workflow.