{"id":28671,"date":"2025-06-17T11:47:50","date_gmt":"2025-06-17T09:47:50","guid":{"rendered":"https:\/\/shop.profiness.de\/questions-and-answers-faq-section\/faq-trapezoidal-sheet-metal-roofs\/"},"modified":"2025-11-05T12:50:20","modified_gmt":"2025-11-05T11:50:20","slug":"faq-trapezoidal-sheet-metal-roofs","status":"publish","type":"page","link":"https:\/\/shop.profiness.de\/en\/questions-and-answers-faq-section\/faq-trapezoidal-sheet-metal-roofs\/","title":{"rendered":"FAQ &#8211; Trapezoidal sheet metal roofs"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\"><strong>\u2753 FAQs about installation on trapezoidal sheet metal roofs<\/strong><\/h1>\n\n<div style=\"height:29px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<h3 class=\"wp-block-heading\">? Fundamentals &amp; prerequisites <\/h3>\n\n<style>.faq-container {\n  max-width: 900px;\n  margin: 0 auto;\n  font-family: system-ui, sans-serif;\n}\n.faq-container details {\n  border: 1px solid #ccc;\n  border-radius: 8px;\n  margin-bottom: 10px;\n  padding: 10px 15px;\n  background: #f9f9f9;\n  transition: all 0.3s ease;\n}\n.faq-container details[open] {\n  background: #eef7ff;\n  border-color: #3399ff;\n}\n.faq-container summary {\n  font-weight: bold;\n  cursor: pointer;\n  outline: none;\n  font-size: 1.05rem;\n}\n.faq-container summary::-webkit-details-marker {\n  display: none;\n}\n.faq-container summary::before {\n  display: none;\n}\n.faq-container p {\n  margin: 10px 0 0 0;\n  line-height: 1.5;\n  font-size: 0.95rem;\n}\n<\/style><div class=\"faq-container\"><details id=\"frage-1\"><summary><strong>1. F\u00fcr welche Dachtypen ist das PROFINESS Roof Trapez System geeignet?<\/strong><\/summary><p>F\u00fcr klassische Trapezblechd\u00e4cher mit Stahl- oder Aluminiumeindeckung ab 0,5\u202fmm Blechdicke.<\/p><\/details><details id=\"frage-2\"><summary><strong>2. Kann ich das System auf Sandwichd\u00e4chern verwenden?<\/strong><\/summary><p>Ja, aber nur wenn der Schraubbereich, also die Oberschale, tragf\u00e4hig ist. Bei Unsicherheit sprechen Sie uns bitte an.<\/p>.\n<\/details><details id=\"frage-3\"><summary><strong>3. Welche Neigung muss das Dach mindestens haben?<\/strong><\/summary><p>Mindestens 5\u00b0, damit keine Wasseransammlungen auf den PV-Modulen entstehen.<\/p><\/details><details id=\"frage-4\"><summary><strong>4. Wie wird das System befestigt \u2013 gibt es Dachdurchdringungen?<\/strong><\/summary><p>Ja. Die Schienenprofile werden direkt auf der Trapezblech-Oberfl\u00e4che verschraubt\n(mit Dichtung unterlegt, bzw. an den Schienen bereits verklebt).<\/p><\/details><details id=\"frage-5\"><summary><strong>5. Muss ich zus\u00e4tzliche Dichtungen verwenden?<\/strong><\/summary><p>Nein. Im Lieferumfang sind bereits EPDM-Dichtstreifen vormontiert oder beiliegend. Unsere Blechschrauben haben ebenfalls eine zus\u00e4tzliche Gummidichtscheibe.<\/p><\/details><details id=\"frage-6\"><summary><strong>6. Ist das System auch f\u00fcr Glas-Glas-Module geeignet?<\/strong><\/summary><p>Ja, sofern geeignete Klemmen mit EPDM-Einlage und definierter Klemmposition verwendet werden.<\/p><\/details><details id=\"frage-7\"><summary><strong>7. Welche Werkzeuge brauche ich f\u00fcr die Montage?<\/strong><\/summary><p>Akkuschrauber, Drehmomentschl\u00fcssel, Innensechskantschl\u00fcssel, Ma\u00dfband.<\/p><\/details><details id=\"frage-8\"><summary><strong>8. Muss ich die Befestigungsl\u00f6cher vorbohren?<\/strong><\/summary><p>Nur bei besonders harten Blechen. In der Regel sind Bohrschrauben ausreichend, diese gibt es mir einer selbstschneidenden und geh\u00e4rteten Bohrspitze.<\/p><\/details><details id=\"frage-9\"><summary><strong>9. Kann ich die Schienen direkt auf der Trapezfl\u00e4che montieren?<\/strong><\/summary><p>Ja. Die Trapezschiene wird entweder direkt auf die Hochsicke gesetzt und mit Blechschrauben befestigt oder es werden Trapezbr\u00fccken von Obersicke zu Obersicke verlegt, die dann ebenfalls direkt mit dem Blech verschraubt werden.<\/p><\/details><details id=\"frage-10\"><summary><strong>10. Welche Befestigungsmittel sind enthalten?<\/strong><\/summary><p>Ein Komplettangebot f\u00fcr eine Anlage auf einem Trapezblechdach besteht i.d.R. aus allem erforderlichen Komponenten wie Bohrschrauben, EPDM-Dichtungen, dem Schienensystem und Modulklemmen \u2013 je nach Systemvariante komplett vorkonfektioniert.<\/p><\/details><\/div>\n\n<div class=\"faq-container\">\n\n<details id=\"frage-11\">\n  <summary><strong>11. What does &#8220;bead-to-bead assembly&#8221; mean?<\/strong><\/summary>\n  <p>This means that the rail is screwed directly onto two adjacent high beads \u2013 for maximum stability.<\/p>\n<\/details>\n\n<details id=\"frage-12\">\n  <summary><strong>12. What if the high ridges are irregular?<\/strong><\/summary>\n  <p>In such cases, different trapezoidal bridges can be used to enable a straight module progression.<\/p>\n<\/details>\n\n<details id=\"frage-13\">\n  <summary><strong>13. How do I find the correct spacing for the trapezoidal sheet metal corrugations?<\/strong><\/summary>\n  <p>The distance is defined in the instructions (e.g. 180 mm, 207 mm, 250 mm). The rail length and drilling pattern must match this. <\/p>\n<\/details>\n\n<details id=\"frage-14\">\n  <summary><strong>14. What screws are used for sheet metal assembly?<\/strong><\/summary>\n  <p>Usually stainless steel self-tapping screws 6.0 \u00d7 25 mm or 6.3 \u00d7 25 mm with EPDM washers.<\/p>\n<\/details>\n\n<details id=\"frage-15\">\n  <summary><strong>15. How many screws are required per rail?<\/strong><\/summary>\n  <p>Usually two per bearing surface (i.e. two per bead) \u2013 the exact quantity depends on the length of the trapezoidal rail and the load applied.<\/p>\n<\/details>\n\n<details id=\"frage-16\">\n  <summary><strong>16. What happens if the screws are placed incorrectly?<\/strong><\/summary>\n  <p>This can lead to leaks or instability! Incorrectly positioned screws\nor their drill holes should be repaired using EPDM plugs, sealant or special repair screws. <\/p>\n<\/details>\n\n<details id=\"frage-17\">\n  <summary><strong>17. Can the rails protrude?<\/strong><\/summary>\n  <p>Yes, provided there is sufficient contact surface on the bead \u2013 always screw in the centre. No module clamps may be mounted on the overlap (cantilever). <\/p>\n<\/details>\n\n<details id=\"frage-18\">\n  <summary><strong>18. Does there need to be a gap between the modules?<\/strong><\/summary>\n  <p>The distance between the modules is automatically determined by the centre clamps (usually 2 cm).<\/p>\n<\/details>\n\n<details id=\"frage-19\">\n  <summary><strong>19. How are glass-glass modules attached to Trapez?<\/strong><\/summary>\n  <p>With special centre clamps with rubber inserts and adjusted torque \u2013 according to module manufacturer approval.<\/p>\n<\/details>\n\n<details id=\"frage-20\">\n  <summary><strong>20. What special considerations apply to sandwich roofs?<\/strong><\/summary>\n  <p>The load must be borne by the trapezoidal profile (upper shell) and not by the soft insulation core.<\/p>\n<\/details>\n\n<\/div>\n\n<div class=\"faq-container\">\n\n<details id=\"frage-21\">\n  <summary><strong>21. How long can rows of modules be on trapezoidal sheet metal?<\/strong><\/summary>\n  <p>Maximum 15 m per row \u2013 for longer rows, expansion joints or separate rows are recommended.<\/p>\n<\/details>\n\n<details id=\"frage-22\">\n  <summary><strong>22. Do the modules have to be clamped symmetrically?<\/strong><\/summary>\n  <p>Yes. The terminal position must be maintained according to the module manufacturer&#8217;s specifications, usually at \u00bc points on the module frame. <\/p>\n<\/details>\n\n<details id=\"frage-23\">\n  <summary><strong>23. How is the electrical connection between the rails established?<\/strong><\/summary>\n  <p>The self-tapping screws create a potential equalisation to the sheet metal, while potential equalisation terminals with claw teeth create a connection between the modules via the clamping.<\/p>\n<\/details>\n\n<details id=\"frage-24\">\n  <summary><strong>24. How is the system earthed?<\/strong><\/summary>\n  <p>About potential equalisation with module frames, terminals and rails. Earthing is carried out in accordance with VDE specifications \u2013 for detailed information on earthing, please contact your electrician. <\/p>\n<\/details>\n\n<details id=\"frage-25\">\n  <summary><strong>25. Are there any differences between click terminals and screw terminals?<\/strong><\/summary>\n  <p>Snap-on terminals can be installed more quickly, while terminals for screw connection with screws and slotted nuts are cheaper and easier to remove \u2013 both are permitted.<\/p>\n<\/details>\n\n<details id=\"frage-26\">\n  <summary><strong>26. What should be considered when using thin-frame glass-glass modules?<\/strong><\/summary>\n  <p>Be sure to use EPDM inserts and work with manufacturer-approved clamps to prevent glass breakage.<\/p>\n<\/details>\n\n<details id=\"frage-27\">\n  <summary><strong>27. What is a slip guard?<\/strong><\/summary>\n  <p>A mechanical safety device (e.g. front stops or special holders)\nto prevent modules from sliding down.<\/p>\n<\/details>\n\n<details id=\"frage-28\">\n  <summary><strong>28. When is slip protection advisable?<\/strong><\/summary>\n  <p>For roofs with a pitch of >10\u00b0 or as additional protection for the bottom row of modules.<\/p>\n<\/details>\n\n<details id=\"frage-29\">\n  <summary><strong>29. Can modules also be mounted horizontally?<\/strong><\/summary>\n  <p>Yes, if there are two module carriers (mounting rails) under each module and the module clamps are used in the correct clamping range.<\/p>\n<\/details>\n\n<details id=\"frage-30\">\n  <summary><strong>30. What installation direction is recommended?<\/strong><\/summary>\n  <p>Vertical or horizontal modules \u2013 both are possible and can be installed using the appropriate trapezoidal rails.<\/p>\n<\/details>\n\n<\/div>\n\n<div class=\"faq-container\">\n\n<details id=\"frage-31\">\n  <summary><strong>31. How do I calculate the number of rails required?<\/strong><\/summary>\n  <p>Depending on the module format and arrangement, two support rails are required per module \u2013 in the case of high wind loads or exposed locations, more may be required \u2013 always plan on a project-specific basis.<\/p>\n<\/details>\n\n<details id=\"frage-32\">\n  <summary><strong>32. How long are the Profiness rails as standard?<\/strong><\/summary>\n  <p>We offer different rail lengths and systems, from 20 cm pieces to lengths of over 7 metres. Our best-selling Performance Standard (40&#215;40 mm) is available from stock in the following lengths: 1.20 m | 1.90 m | 2.40 m | 3.30 m | 3.60 m | 4.80 m | 6.00 m | 6.60 m.  <\/p>\n<\/details>\n\n<details id=\"frage-33\">\n  <summary><strong>33. How are the modules attached to the rails?<\/strong><\/summary>\n  <p>With centre clamps and end clamps \u2013 matching the module frame height (e.g. 30, 35 or 40 mm).<\/p>\n<\/details>\n\n<details id=\"frage-34\">\n  <summary><strong>34. What torques apply to the terminals?<\/strong><\/summary>\n  <p>14\u201316 Nm for Connect Basic clamps with slotted nut or 8\u201310 Nm for Connect Quick KlickFix clamps.\nPlease follow the assembly instructions.<\/p>\n<\/details>\n\n<details id=\"frage-35\">\n  <summary><strong>35. How is it ensured that no water penetrates?<\/strong><\/summary>\n  <p>All screws are fitted with EPDM seals. It is important that the screw is inserted vertically. <\/p>\n<\/details>\n\n<details id=\"frage-36\">\n  <summary><strong>36. What should you do if you accidentally drill into the sheet metal?<\/strong><\/summary>\n  <p>Seal the drill hole with EPDM sealant or sheet metal sealing compound \u2013 do not leave any open areas.<\/p>\n<\/details>\n\n<details id=\"frage-37\">\n  <summary><strong>37. Can the system be dismantled?<\/strong><\/summary>\n  <p>Yes, all elements can be completely dismantled. The sheet metal screw connections must then be properly sealed. <\/p>\n<\/details>\n\n<details id=\"frage-38\">\n  <summary><strong>38. Do I need to consider lightning protection?<\/strong><\/summary>\n  <p>Yes \u2013 depending on the size and use of the building. PV systems are considered external lightning conductors and must be integrated. <\/p>\n<\/details>\n\n<details id=\"frage-39\">\n  <summary><strong>39. Can I also install the system on halls or carports?<\/strong><\/summary>\n  <p>Yes, provided that the trapezoidal sheet metal is securely screwed in place and sufficient edge distances are maintained.<\/p>\n<\/details>\n\n<details id=\"frage-40\">\n  <summary><strong>40. Are there alternatives to screw fastening?<\/strong><\/summary>\n  <p>Mounting by means of screw connections to the trapezoidal sheet metal is state of the art and offers lasting safety when installed correctly.<\/p>\n<\/details>\n\n<\/div>\n\n<div class=\"faq-container\">\n\n<details id=\"frage-41\">\n  <summary><strong>41. How close to the edge of the roof can I install it?<\/strong><\/summary>\n  <p>Theoretically, it is possible to build right up to the edge. Ideally, there should be a 50 cm gap between the roof edge, corners or parapet to reduce wind suction forces. <\/p>\n<\/details>\n\n<details id=\"frage-42\">\n  <summary><strong>42. What loads must the roof be able to bear?<\/strong><\/summary>\n  <p>Wind load, snow load and dead weight of the modules \u2013 to be checked individually depending on the region and structural analysis.<\/p>\n<\/details>\n\n<details id=\"frage-43\">\n  <summary><strong>43. Is there an online tool for planning?<\/strong><\/summary>\n  <p>Profiness offers individual planning assistance on request \u2013 an automated online tool is in preparation.<\/p>\n<\/details>\n\n<details id=\"frage-44\">\n  <summary><strong>44. What is the best way to lay cables?<\/strong><\/summary>\n  <p>Under the modules along the rail, secured with UV-resistant cable ties or clips.<\/p>\n<\/details>\n\n<details id=\"frage-45\">\n  <summary><strong>45. What should be considered in the event of significant temperature fluctuations?<\/strong><\/summary>\n  <p>Provide expansion joints at intervals of no more than 15 metres and allow for flexible cable reserves.<\/p>\n<\/details>\n\n<details id=\"frage-46\">\n  <summary><strong>46. Do I need to perform maintenance?<\/strong><\/summary>\n  <p>Yes, an annual visual inspection is recommended: check clamps, screws, cables and module fastenings and remove any dirt if necessary.<\/p>\n<\/details>\n\n<details id=\"frage-47\">\n  <summary><strong>47. What common installation errors should I avoid?<\/strong><\/summary>\n  <p>Crooked clamps, missing seals, incorrect screw length, asymmetrical module clamping.<\/p>\n<\/details>\n\n<details id=\"frage-48\">\n  <summary><strong>48. What should I do if it rains or snows during installation?<\/strong><\/summary>\n  <p>Only mount on dry surfaces \u2013 seals only work on clean, dry surfaces.<\/p>\n<\/details>\n\n<details id=\"frage-49\">\n  <summary><strong>49. How much does installation by a specialist company cost?<\/strong><\/summary>\n  <p>Please feel free to ask an installer of your choice.<\/p>\n<\/details>\n\n<details id=\"frage-50\">\n  <summary><strong>50. Where can I find the assembly instructions?<\/strong><\/summary>\n<p>The current instructions are available for <a href=\"https:\/\/www.profiness.de\/downloads\/kataloge\" target=\"_blank\" rel=\"noopener\">download<\/a> at <a href=\"https:\/\/www.profiness.de\/downloads\/kataloge\" target=\"_blank\" rel=\"noopener\">www.profiness.de.<\/a><\/p>\n<\/details>\n\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u2753 FAQs about installation on trapezoidal sheet metal roofs ? Fundamentals &amp; prerequisites 1. F\u00fcr welche Dachtypen ist das PROFINESS Roof Trapez System geeignet? F\u00fcr klassische Trapezblechd\u00e4cher mit Stahl- oder Aluminiumeindeckung ab 0,5\u202fmm Blechdicke. 2. Kann ich das System auf Sandwichd\u00e4chern verwenden? Ja, aber nur wenn der Schraubbereich, also die Oberschale, tragf\u00e4hig ist. Bei Unsicherheit [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":28665,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-28671","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/shop.profiness.de\/en\/wp-json\/wp\/v2\/pages\/28671","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/shop.profiness.de\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/shop.profiness.de\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/shop.profiness.de\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/shop.profiness.de\/en\/wp-json\/wp\/v2\/comments?post=28671"}],"version-history":[{"count":0,"href":"https:\/\/shop.profiness.de\/en\/wp-json\/wp\/v2\/pages\/28671\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/shop.profiness.de\/en\/wp-json\/wp\/v2\/pages\/28665"}],"wp:attachment":[{"href":"https:\/\/shop.profiness.de\/en\/wp-json\/wp\/v2\/media?parent=28671"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}