Kyowa Holdings Launches "STRUCK," a Next-Generation Flat Roof Mounting System for Solar Panels ― A Flat Roof Mounting System Born from an EPC that Understands the Site ―
Kyowa Holdings will launch "STRUCK," a solar mounting system for flat roofs developed from the realistic perspective of solar power generation facility installation work, on April 1, 2026. Leveraging its EPC business expertise, it aims to improve constructability, safety, and waterproofing.
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- 📰 Published: April 1, 2026 at 19:00
Kyowa Holdings Co., Ltd. (Headquarters: Shibuya-ku, Tokyo; Representative Director and President: Kazuya Tatematsu) will launch "STRUCK," a solar mounting system for flat roofs developed from the realistic perspective of solar power generation facility installation work, on April 1, 2026.
Why We Created This Mounting System
Kyowa Holdings is a company that has handled EPC (Engineering, Procurement, Construction, and O&M) for solar power generation in-house. This is why we deeply understand not only design but also on-site challenges.
Varying slopes, steps, and waterproofing layer conditions for each building. Fixing while maintaining waterproofing guarantees. Strength design that truly ensures safety against typhoons and earthquakes. And the ability for workers on-site to handle it "easily and accurately."
A mounting system that satisfied all these requirements did not exist in the market. That's why we decided to create it ourselves. That is "STRUCK."
"STRUCK" is a coined word from "structure" × "Rack." It embodies the meaning of "Stot" (snugly fitting) for ease of adjustment, "Raku" (easy) for constructability, and "struck" meaning deeply impressive.
Four Challenges We Faced Repeatedly On-Site
As an EPC contractor, the challenges we repeatedly experienced on-site have become the development themes for STRUCK.
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Design Burden: Conditions vary for each building, requiring individual design and on-site adjustments each time.
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Construction Complexity: Drilling holes and driving anchors into the waterproofing layer increases construction time and affects waterproofing guarantees.
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Wind and Earthquake Resistance Concerns: Especially the risk of wind load concentration at roof edges and corners. No compromise in a country prone to typhoons and earthquakes.
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Weight Barrier: Cases where heavy mounting systems cannot be used due to load-bearing limits of existing buildings are endless.
These are not theoretical problems but challenges we have repeatedly faced ourselves on construction sites.
STRUCK's Three Solutions for the Site
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01 Construction |
Flexible constructability that fits snugly on-site |
Infinitely adjustable height with high-precision aluminum frames + stud bolts. Flexible rails allow free angle adjustment. Can be adapted on-site even for roofs with varying slopes, steps, and height differences. |
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02 Design |
Designed based on Building Standards Law and related notifications |
Designed based on the Building Standards Law and Ministry of Construction Notifications (No. 1454 and No. 1458). Addresses wind pressure concentration points at edges and corners of roofs. Structure prevents the base from peeling off even against forces lifting panels from below. |
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03 Materials |
Material selection for long-term reliability without damaging the waterproofing layer |
Uses high-strength aluminum material compliant with JIS standards (tested by Japan Building Material Test Center) and acrylic foam tape compliant with ASTM international standards. Fixed without drilling holes or driving anchors, protecting the waterproofing layer. Proven in tests to maintain over 90% of initial adhesive strength even after 20 years of outdoor exposure. |
Voices from the Development Team
We wanted to provide a solution for "wanting to install but unable to"
For solar installations on flat roofs, there has always been the challenge of "wanting to install but unable to." Due to building conditions, load-bearing capacity can be strict, anchor installation difficult, and general methods hard to adopt due to waterproofing layer conditions. Faced with such constraints, we have seen many situations where installation had to be abandoned. STRUCK was developed to balance ease of introduction and peace of mind by addressing these realities.
We believed that reducing the burden on-site is also a value of the mounting system
On construction sites, even slight misalignments or differences in fit can lead to significant rework and burden. Transporting heavy components, interference with slopes and drainage paths, and on-site adjustments for each location – there are many difficulties that are not visible on drawings until actual construction begins. We developed this product with the desire to reduce such on-site burdens as much as possible.
"Ease of fitting" was the starting point for design
Conditions vary for each building, and there are many situations where things cannot be simply divided according to drawings. That's why, with STRUCK, we prioritized adaptability to slopes, steps, and height differences, as well as ease of fine-tuning on-site. We believe it's important for both designers and installers not to "force a fit" but to "create a state that is easy to fit from the start." This philosophy has been incorporated into the very structure of STRUCK.
What We Can Say Because We Handle EPC
A mounting system is not just about installation. Post-construction power generation performance, maintainability, and owner satisfaction years down the line are all tied to the quality of the mounting system.
As an EPC contractor, having been consistently involved from design to construction and O&M, we have created a product that we can confidently say, "We want to install with this mounting system."
STRUCK could not have been created by a mounting system manufacturer that only sells. It is a mounting system born from a team that has been on the ground, continuously addressing customer challenges.
For These Sites and Businesses
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EPC contractors and construction companies that want to proceed with installations on multiple flat roofs such as factories, logistics warehouses, and commercial facilities.
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Building owners who want to introduce solar power while maintaining existing waterproofing guarantees.
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On-site personnel who do not want to compromise on wind resistance performance when installing at roof edges and corners.
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Designers who want to handle buildings with diverse slopes and height differences while reducing design burden.
Company Profile / Contact Information
Company Name: Kyowa Holdings Co., Ltd.
Location: Shibuya Doyu Building V 3F, 1-19-5 Shibuya, Shibuya-ku, Tokyo 150-0002
TEL: 03-6908-9950
E-mail: struck.kyowa@kyowaholdings.jp
FAQ
What is STRUCK?
STRUCK is a next-generation flat roof mounting system for solar power generation facilities, developed by Kyowa Holdings, specialized in solving on-site challenges.
What are the main features of STRUCK?
Its main features are flexible on-site constructability, design based on building codes, and a fixing method that does not damage the waterproofing layer.
What problems does it solve?
It solves challenges in flat roof installations such as design burden per building, construction complexity, concerns about wind/earthquake resistance, and load-bearing limits of existing buildings.