Waterproofing treatment during installation of roof photovoltaic brackets

At present, domestic roofs can be roughly divided into household Chinese glazed roof tile roofs, concrete flat roofs and color steel tile roofs. For the installation of rooftop solar power plants, "waterproofing" has to be said to be a very important factor!

First of all, we need to tell you that the general principle of roof waterproof treatment is: it is better to guide rather than block, that is, to ensure that the node treatment can smoothly let the water drain off when the water is accumulated in rainstorm, so as to ensure that the roof does not leak.

Therefore, in the design, the first step should be to ensure that the bracket base is not arranged perpendicular to the drainage direction and does not hinder the drainage of roof rainwater. In addition, when installing the photovoltaic system directly on the existing roof during construction, the base does not have any relationship with the structural layer of the original roof. Therefore, to ensure the safety of the structure, it is necessary to ensure that the base is placed smoothly and neatly, and measures need to be taken to fix it to avoid overturning, sliding, and other phenomena. Due to the lack of relationship between the base and the structural layer, it is difficult to install an additional waterproof layer. It is necessary to try to preserve the waterproof layer of the original roof as much as possible to prevent leakage.

For situations where drilling is necessary to damage the original roof, it is necessary to adapt to local conditions and make different treatments according to different situations:

1. Waterproofing of photovoltaic brackets on concrete flat roofs

For new buildings with concrete flat roofs or villa concrete sloping roofs (covered with tiles), bolts should usually be embedded during design and roof waterproofing should be done according to conventional practices.

For existing buildings with concrete flat roofs or villa concrete sloping roofs (covered with tiles), the roof structure should be confirmed first. When connecting the photovoltaic module base to the structural layer, there are weak waterproof links around the metal embedded parts at the top of the base. If not handled properly, rainwater can easily seep from around the bolts of the embedded parts to the structural layer, causing corrosion to the load-bearing steel bars of the structural layer, forming a safety hazard. Therefore, when setting up the photovoltaic module base, the waterproof layer should be laid on the upper part of the base and metal embedded parts, and sealed around the anchor bolts. The waterproof layer should be filled with waterproof sealant to isolate the rainwater infiltration path. In addition, an additional waterproof layer should be added to the lower part of the base. Even if there is leakage at the top of the base, rainwater will not reach the structural layer.

2. Waterproof installation of color steel tile photovoltaic brackets

For colored steel tile roofs, the steel structure of the photovoltaic system needs to penetrate the original waterproof layer and profiled steel plates, and be fixed to the main steel structure of the building; Refer to the waterproofing method of colored steel tile roofs for steam insulation, insulation, and waterproofing treatment. The focus of construction is to remove rust, seal, and apply waterproof coatings to the base and periphery.

Local leakage points on the colored steel tile roof should be sealed with high-quality neutral weather resistant sealant; For locally corroded color steel plates, they need to be replaced before installing photovoltaic modules.

1) For the case where the cross-section of the color steel plate rib plate is trapezoidal: The solar bracket is usually connected to the color steel plate from the side or top surface through self tapping bolts. Self tapping bolts must be equipped with matching weather resistant sealing and waterproof gaskets, and after fixing the self tapping bolts, high-quality neutral weather resistant sealant must be applied to the screws.

2) For situations where cable sleeves pass through roof panels: there are practices in the existing national standard atlas. In design and construction, it can be selected according to the specific situation of the actual project.

3) For the case of cables passing through the roof panel: Teflon sheets can be used for waterproofing. Detai cover is a type of roof waterproof structure, often used on roofs with colored profiled steel plates. It has good physical properties and chemical corrosion resistance, and can overcome problems such as water leakage of rigid waterproof materials.

3. Waterproofing treatment at the roof perforation of solar bracket manufacturers

For existing buildings with concrete flat roofs or villa concrete sloping roofs, if chemical anchor bolts are used to fix photovoltaic brackets, the thickness of the protective layer or surface layer should be confirmed first. For prefabricated floor roofs with large load-bearing capacity per unit area, the base fixation method of prefabricated cement piers can be used on the roof, and the brackets can be fixed using chemical anchor bolts after solidification. For sloping roofs covered with tiles, the depth of drilling should be confirmed. After fixing the chemical anchor bolts, the position where the bolts pass through the tiles should be well treated with waterproof sealant. Chemical anchor bolts have high load-bearing capacity, resistance to fatigue and aging, and some models can withstand dynamic and impact loads; There is no expansion force on the substrate and no compressive stress is generated, therefore, it will not have adverse effects on roof waterproofing.