Bjarnes System direct-to-substrate clips
Standing seam clips for direct-to-substrate installation
Direct-to-substrate clip systems for standing seam roofs
Our Bjarnes System direct-to-substrate clips are designed for standing seam metal roofing where the clip is fixed straight into the supporting substrate rather than into an externally insulated Krabban build-up. On this page, the range is organised by substrate, seam type and whether a 7 mm structural mat is part of the build-up, so it is easier to move from roof detail to the right clip family.
The right choice is not only about the clip itself. You also need to decide where fixed clips should lock the sheet, where sliding clips should absorb thermal movement, and whether galvanised or stainless execution is the better fit for the environment and project demands. We help contractors and specifiers choose the right setup and the right fastening plan for the roof.
Choose the right direct-to-substrate clip setup
25 mm seam clips for wood
Choose our 25 mm seam clips for wood when the roof is being fastened directly into timber or wood-based substrates and you need a standard direct-to-substrate standing seam setup. This group covers both fixed clips for the fixed zone and sliding clips for movement zones, with banded sliding variants available when faster, repetitive installation matters. For higher point or snow loads, our fixed shear clips are the stronger option.
25 mm seam clips for wood with 7 mm structural mat
Use our 25 mm seam clips with 7 mm structural mat when the roof build-up adds a separating mat between the metal and the substrate. This is the better choice than standard direct-to-wood clips when you need the clip geometry and fastening logic to match that extra layer. Both fixed and sliding variants are included, together with banded sliding clips for efficient installation.
See technical details for our 25 mm seam clips with 7 mm structural mat on page 29 in the handbook
Welded seam clips for wood
Choose our welded seam clips for wood when the seam profile itself drives the clip choice. These are sliding clip solutions for welded seams, helping the roof move correctly without forcing a 25 mm seam clip into a build-up it was not designed for.
See details and technical data for our welded seam clips for wood on page 30 in the handbook
25 mm seam clips for concrete, lightweight concrete, sandwich and sheet metal
Use our 25 mm seam clips for concrete, lightweight concrete, sandwich and sheet metal substrates when the roof is fastened directly into mineral or metal-based build-ups instead of timber. This group gives you both fixed and sliding clip options, so you can match the substrate while still separating restraint in the fixed zone from movement across the rest of the roof.
See fixed and sliding clip details for 25 mm seams on pages 31-32 in the handbook
25 mm seam clips with 7 mm structural mat for non-wood substrates
Choose our 25 mm seam clips with 7 mm structural mat for concrete, lightweight concrete, sandwich and sheet metal when the build-up includes a mat layer and the substrate is not wood. This is the right subgroup when a standard direct-to-substrate 25 mm seam clip would ignore the extra layer and its effect on the fastening setup.
See technical details for our 25 mm seam clips with 7 mm structural mat on page 33 in the handbook
Welded seam clips for non-wood substrates
Use our welded seam clips for concrete, lightweight concrete, sandwich and sheet metal when the project calls for welded seam detailing on these substrates. These sliding clip options are the clean choice for seam movement and substrate fit, rather than adapting a wood clip or a 25 mm seam clip to a different seam geometry.
See technical details for our welded seam clips for non-wood substrates on page 34 in the handbook
Detailed direct-to-substrate clip data in the handbook
The handbook below is where you compare the direct-to-substrate range in detail. It brings together the clip families for wood, concrete and lightweight concrete, sandwich and sheet metal substrates, and separates them by 25 mm seams, welded seams and build-ups with 7 mm structural mat.
It is also the right place to check the supporting technical context around thermal movement, fixed and moveable zones, wind load, durability and the fasteners used to secure clips into the substrate.
Page 23 - Direct-to-substrate clip selection and planning considerations
Page 24 - Fasteners for sheet metal, wood, lightweight concrete and concrete
Page 26 - Wood substrates: fixed clips for 25 mm seams
Page 28 - Wood substrates: banded sliding clips for 25 mm seams
Page 29 - Wood substrates: 25 mm seams with 7 mm structural mat
Page 30 - Wood substrates: welded seam sliding clips
Page 31 - Concrete, lightweight concrete, sandwich and sheet metal: fixed clips for 25 mm seams
Page 32 - Concrete, lightweight concrete, sandwich and sheet metal: sliding clips for 25 mm seams
Page 33 - Concrete, lightweight concrete, sandwich and sheet metal: 25 mm seams with 7 mm structural mat
Page 34 - Concrete, lightweight concrete, sandwich and sheet metal: welded seam sliding clips
Need help choosing the right direct-to-substrate clip setup?
Tell us what seam type, substrate and roof build-up you are working with, and we will help you narrow the range quickly. We can support with clip selection, fixed-zone and movement-zone logic, corrosion choice and the fastening plan needed for a safer, more efficient installation.
How do I choose between fixed and sliding clips?
Fixed clips are used in the fixed zone where the sheet needs to be locked in position, while sliding clips are used outside that zone where the sheet needs room to move with temperature change. The choice depends on the roof layout, sheet length and where the centre of movement sits. Mixing them correctly helps prevent unnecessary stress in the sheet and transfers forces into the substrate in the intended way.
Does the substrate change which clip family I should use?
Yes. Wood, concrete, lightweight concrete, sandwich and sheet metal substrates do not share one universal direct-to-substrate clip family. The handbook groups the range by substrate because both clip choice and fastening method change with the build-up. Starting with the real substrate is the fastest way to avoid choosing the right seam clip with the wrong fastening logic.
Do I need a different clip setup when a 7 mm structural mat is included?
Yes. When a 7 mm structural mat is part of the build-up, you should choose the clip family intended for that build-up rather than the standard direct-to-substrate option. The mat changes the installation stack, so this solution is separated from regular 25 mm seam clips in the handbook. That matters both for fit and for choosing the right fixed and sliding combination.
Are welded seam clips different from 25 mm seam clips?
Yes. Welded seam installations have their own clip families, and they should not be treated as interchangeable with the 25 mm seam range. The deciding factor is the seam geometry itself, not only the substrate below. Choosing the correct seam-specific clip helps the installation sit correctly and move as intended.
When should I choose stainless clips instead of galvanised clips?
Choose stainless clips when the environment or corrosion demand is higher and the project calls for greater corrosion resistance. The handbook explicitly links clip and fastening choice to the corrosion class of the environment, so this should be resolved early in specification. Getting this wrong can undermine long-term durability even if the clip shape itself is correct.
Can I reuse Bjarnes System design values for similar clips from another brand?
No. The handbook states that the design values are unique to Bjarnes System products and should not be transferred to similar-looking clips from another brand. That matters because performance data is tied to the specific product, material and test basis. If the project changes brand, the design basis should be checked again.
Can Bjarnes System help with wind-load calculations and fastening plans?
Yes. For direct-to-substrate installation, wind-load calculations and a fastening plan are important parts of choosing the clip setup, not something to sort out afterwards. We help customers work through substrate, seam type, roof geometry, loading and fixed-zone requirements so the selected solution matches the real project conditions.