S-5!®  Z-Clamps for round “bulb” seams

The S-5!® Z-Clamps, made of Aluminium, are specially developed to fit profiles having round “bulb” seams with max. 23mm diameter such as roofs of Kalzip®, Bemo®, Aluform, Interfalz, Euroseam®, Kingspan, etc.. Its two-piece design with an insert allows perfect form closure on the seam, without piercing it. This is the basic for the high holding strength.

The S-5!® Z-Clamps are currently the only clamps on the market with an official approval for all these round “bulb” standing seam profiles. 

All components in Germany related to fixing solar products for
PV installations needs to carry a German approval by the DIBt (German Center of Competence for Civil Engineering – Authority of the German Government). The S-5!® Z-Clamp family have the national technical approval for these profiles of following internationally operating producer: DIBt No. Z-14.4-719.

Kalzip-Aluminium-Profile from Kalzip
– BEMO-FLAT-ROOF from Bemo
– ALUFALZ and FALZ-RIPP from Aluform.

Fixed on round bulb seam

The Z-Clamp with two set-screws (and insert, one M8 thread and M8 stainless steel bolt) is used for heavy demands e.g. fall protection systems and in the ColorGard® snow retention. Packed with 44 pieces per box.

The Z-Mini (with insert, M8 thread and M8 stainless steel bolt) and the Z-Mini-FL (with insert and Flange with 18x11mm hole) with one set-screw are utilized in various instances when multiple clamps are required for the attachment of rigid objects to the seams, e.g. rail systems for solar installations, the RoofTech tube snow retentions, signs, walkways, satellite dishes, antennas, lightning protection, cable trays, pipe and cable layingmechanical equipment, etc..
Z-Mini and Z-Mini-FL: packed with 68 pieces per box.

The following innovations and changes will be made step by step from July 2020. After the current stock of the respective article has been sold off, we will also make the changes.

  • In the future the S-5!® Mini-Clamps will be delivered without M8x16 stainless steel screws. The changeover will take place after the sale of the previous boxes. The M8-screws can then be ordered separately from us, packed with 100 pieces per box.
  • The set screws of the S-5! clamps will be supplied with Torx 30 female thread in the future. A mounting bit (Torx T30) will be supplied in each box as before. The tightening forces remain unchanged.

Examples of Applications:

Fall protection with Z-clamps
Fall protection with Z-Clamps and PV installation with Z-Minis
PV-installation strong fixed with Z-Mini-FL.
RoofTech One-Tube Holder attached on S-5! Z-Mini
Rail fixed with adapter plate on S-5! Z-Mini Clamp
S-5! Z-Mini-FL under rails with an underside screw channel.

To install S-5-Z-Clamps:

1) Partially thread the setscrews into the clamp by hand. 

2) Position clamp at desired location along seam with the bolt hole in the correct (upslope or downslope) orientation. Then, affix ancillary items using the screw provided. Don’t fix the clamps on or beside the clips of the profile
(distance 17.5 cm)!
 The thermal elongation of the panels may not be hindered! 

3) Install by holding the small insert piece under the edge of the seam, then roll the clamp into position over the seam and insert. 

4) Tighten the setscrews at the base of the clamp using a screwgun and the included screwgun bit tip. For optimal holding strength, setscrews should be tensioned to 160 to 180 inch pounds (18-20Nm) on 22ga steel, and 130 to 150 inch pounds (15-17Nm) on all other metals and thinner gauges of steel.

 5) For critical attachment applications utilizing an M8-1.25 X 16 mm hex flange bolt, tighten the included M8 bolt to 160 inch pounds (13 foot pounds).

Please note:
When using the S-5-Z,  S-5-Z Mini, or S-5-Z-Mini FL, it is important that the clamp is not installed at (or near) a halter location.  For rail-mounted solar applications, this is easily accomplished, by installing rails directly above and parallel to the seam.  Solar modules are then installed in landscape to the seams of the roof.  The S-5-Z Mini or S-5-Z Mini FL are the clamps of choice for this type application and can be installed with frequency as to satisfy virtually any uplift load condition, and any halter spacing. Simply engineer the design and attachment frequency using tested load values of the S-5 clamp.

Please note in general:

Please make sure that the load coming into the clamp will be taken by the structure of the roof. Assumption is that the determination has been made that the roof to which the S-5! clamps will be attached is structurally adequate. Any loads imposed on the S-5! clamps will be transferred to the panels. Panel seams must have sufficient flexural strength to carry these loads. Panels must also be adequately attached to the building structure, and the structure must be sufficient to carry these loads. In particular, the snow and wind loads, the additional loads from the installations attached to the clamps, as well as the increased loads in the edge and corner areas of the roof construction must be taken into account. A sufficient number of clamps must be provided. For statically relevant clamps, a distance of at least 500 mm from the end of the standing seam profile must be maintained. RoofTech, the makers and distributor of S-5! clamps make no representations with respect to these variables. It is the responsibility of the user to verify this information, or seek assistance from a qualified design professional or stress analyst, if necessary.

Responsible for the stability of a building structure is the building owner or the owner or operator. The installer of the system is responsible not only for the system but also for the roof on which the system is installed. Whoever installs a system on an existing roof without having checked the stability beforehand, violates existing law! For critical installations, inquire for specific test data of ultimate tensile load on specific panel materials and seam types. The sufficient holding force of the roofing to the supporting or substructure must always be ensured. The sufficient holding force of the roofing on the supporting or substructure must always be guaranteed. Proof must be provided by the customer or installer. In cases of doubt, a structural engineer must be consulted to determine the loads and its effects.  

Please note the installation instructions of the respective S-5!® clamps and the other products used! Mounting the clamps take care that the set screws and bolts are tightened with the right screw tension as written in each installation instruction (also available under "Information" and on the homepage of S-5!: www.s-5.com). When tabled values are used, screw tensions should be verified and factors of safety should be used as appropriate.

When mounting rigid objects such as rails, pipes, cable trays, etc. on the clamps, these must be separated at regular intervals (max. 3m) in order to limit deformation due to thermal length changes.The thermally induced change in length of the roofing must not be hindered!

With some roofs made of profiled sheets (e.g. with round bulb seams, snap seams, RibRoof seams, etc.), it must be ensured that the clamps in the sliding area of the sheets are not mounted on or next to the holders of the roofing. In the case of double standing seam roofing, the S-5!® E and B clamps can, under certain circumstances, hinder the thermally induced length change of the sheet if, despite the high clamping point of the S-5!® E and B clamps, the foot of a sliding clip extends into the clamping area of the clamp. In this case, the S-5!® E and B clamps should be placed at a distance of 25 mm from the sliding clips.

In the case of handcrafted metal roofing on wooden formwork, the edge and corner areas should not be covered with modules due to the limited load-bearing capacity of the roofing and the adhesives. In the central area, the skipping of seams are usually not possible. Therefore we recommend to install clamps on each seam. The installation of PV systems represents a punctual load entry, therefore we recommend reduced clip distances and screwed clips. The mounting and fastening of the clamp should be carried out between the clips to achieve an optimal load sharing.

The material properties of the respective metals, the combination with each other as well as the installation instructions and regulations of all manufacturers involved (including those of the metal roof) must be observed.

The suitability for the intended use is checked by the user himself. If technical details are not described separately, this does not release the company carrying out the work from its obligation to check the individual case and clarify the correct technical facts beforehand.

It must be ensured by the planner and the specialist company responsible for the installation that the planning and installation are carried out strictly in accordance with the national and site-specific building regulations, occupational safety and accident prevention regulations, standards and environmental protection regulations. Every person who plans and installs with our products is obliged to inform himself independently about all rules and regulations for technically correct planning and installation and to observe them. This also includes obtaining the current status of the necessary rules and regulations.

S-5!® Warning: Please use the products responsibly! Visit our website of S-5! (www.s-5.com) or contact your S-5! distributor for available load test results. The user and/or installer of these parts is responsible for all necessary engineering and design to ensure the S-5! clamps have been properly spaced and configured.

Notice to S-5! users: Due to the many variables involved with specific panel products, climates, snow melt phenomena, and job particulars, the manufacturer cannot and does not express any opinions as to the suitability of any S-5! assembly for any specific application and assumes no liability with respect thereto. S-5! products are tested for ultimate holding strength on various profile types and materials. Visit www.S-5.com for more details.

The user and/or installer bears also the responsibility not only for the professional installation, but also for the roof on which he is mounted. The user and/or installer must always clarify in advance the application possibilities and application of our products in connection with the other used materials and products at the single project.

The user and/or installer of all our products is responsible for all necessary engineering and design to ensure that the S.5! clamps and other products has been properly spaced and configured. It is the responsibility of the user to verify this information, or seek assistance from a qualified design professional or stress analyst, if necessary. RoofTech, the makers and distributor of S-5! clamps make no representations with respect to these variables.

The S-5! clamp is a handy gadget for a great many uses, but will not perform miracles. PLEASE USE THE PRODUCTS RESPONSIBLY!

For critical installations, inquire for specific test data of ultimate tensile load on specific panel materials and seam types. When tabled values are used, screw tensions should be verified and factors of safety should be used as appropriate. RoofTech and the manufacturer expresses no opinions as to the suitability of the S-5! products for any specific application or project condition.


The respective installation instructions must always be observed. However, the respective installation instructions do not release the executing company from the obligation to clarify in advance the possible uses and applications of our products, also in connection with the other materials used, on the individual project.

RoofTech GmbH, S-5!® - Metal Roof Innovations Ltd. and the manufacturers of our other products assume no responsibility and liability for assembly, suitability and applications.

Further information and the individual installation instructions for our products can be downloaded under "Information". We would be pleased to send you the respective installation instructions and the requested information. We look forward to your message or call.

Additional information, load test results, CAD details, metallurgical compatibilities, specifications and information about other S-5! products are available on the homepage of S-5!: www.s-5.com.

No liability for printing errors. Subject to technical changes. We assume no liability for errors on the website. Pictures and drawings may show stages of development that are not available in this form. Any content (pictures, trademarks, logos, drawings and other data) may only be used or passed on after consultation and approval by RoofTech GmbH or Metal Roof Innovations Ltd. S-5! products are protected by international patents of Metal Roof Innovations Ltd. (Link to S-5! Terms of Use).

The relations between us and you are exclusively subject to the laws of the Federal Republic of Germany. The UN Convention on Contracts for the International Sale of Goods as of 11 April 1980 (CISG) does not apply. Our General Terms and Conditions apply, which we are happy to provide you with at any time (direct link to our RoofTech General Terms and Conditions).

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