Photovoltaic Prefabricated Panel Factory Building Roof

Whether the photovoltaic prefabricated panel factory building roof is suitable needs to be judged based on specific scenarios. It has suitable scenarios and also many unsuitable ones.

Suitable Scenarios

• Projects with tight schedules: Prefabricated sandwich panels are one-time pressed finished products in the factory. The upper and lower color-coated steel plates and the intermediate core material are formed into one piece. After being packaged and transported to the construction site, they can be directly hoisted and laid, and the seams can be fixed. This standardized construction method greatly shortens the construction period and is a more appropriate choice for projects with extremely strict time requirements.
• Factories with extremely high requirements for a dust-free environment: Industries such as electronics and food have extremely high requirements for a dust-free production environment. During the production process of prefabricated sandwich panels, strict quality control can be carried out in the factory to reduce the generation of dust and impurities at the construction site, which can better meet the dust-free environment requirements of such factories.
• Small warehouses with small areas and regular structures or places with narrow construction sites: For small warehouses with small areas and regular structures, or places with narrow construction sites where even foaming equipment cannot be placed, the standardized finished panel characteristics of prefabricated sandwich panels enable them to be quickly installed without being restricted by site space and equipment.

Unsuitable Scenarios

• Roofs to be fully covered with photovoltaic panels and aiming for maintenance-free for more than 20 years: There are a large number of horizontal and vertical seams at the joints of prefabricated sandwich panels. After the photovoltaic panels are fully covered, the seams are blocked. During later water seepage and leakage repairs, a large number of photovoltaic components need to be removed, resulting in extremely high costs. In contrast, on-site composite roofs are seamlessly formed as a whole, which can reduce 90% of the water seepage risks. The waterproof service life matches the 25-year design service life of photovoltaic panels, and there is almost no need to remove photovoltaic panels for repairs later.
• Factories with large spans, long roof lengths, and a desire to avoid excessive overlaps: Prefabricated sandwich panels are restricted by the transportation length of trucks and can generally be transported for a maximum of 6 - 8 meters. When laying them in large-span factories, multiple overlap seams must be reserved. The more nodes there are, the higher the risk of water leakage. On-site composites have no length restrictions. A single-span roof can be laid all the way to the end, greatly reducing the number of overlap nodes. The roof has stronger integrity, and its waterproof performance and structural stability are far superior to those of prefabricated panels.
• Complex working conditions such as old factory renovations, irregular roofs, and multiple high-low spans: During the renovation of old factories, the original purlins are irregular, the roofs have varying heights and many corners, and there may even be curved roofs. After the prefabricated sandwich panels are cut and adapted, a large number of edge seams will be generated, which are difficult to seal and are extremely prone to water leakage. On-site composite construction is flexible and can be formed according to the trend of the roof structure. Irregular parts and the junctions of high-low spans can be transitioned as a whole without the need for additional glue application and seam sealing, making it more adaptable for renovations.
• Factory areas with narrow roads where large trucks and cranes cannot enter: Prefabricated sandwich panels are large finished products that require large trucks for transportation and cranes for hoisting and entering the site. In many old parks and factory areas, the internal roads are narrow with height and width restrictions, and large equipment cannot enter, making construction impossible. On-site composites only require the transportation of small items such as color-coated steel coils and foaming raw materials, and manual labor and small equipment can be used for transfer and construction,不受场地路况限制 (not restricted by site road conditions).
• Under the long-term pressure of photovoltaic brackets: The tongue-and-groove positions of prefabricated panels are very prone to deformation under force and may even delaminate. The overall structure of on-site composites has uniform force distribution and is more stable.