At present, under the strong support of national and local government policies, distributed photovoltaic power generation systems have become more widely used, accounting for more than 57% of the total installed capacity of photovoltaic power generation systems, and have become an important development direction in the future.
However, due to the introduction of distributed photovoltaic power generation in the market, the quality of design and construction is uneven, and the waterproofing problem of PV roofs is easily overlooked. Once the waterproof layer is installed, even if there is no waterproof layer, leakage will occur. This will not only affect the photovoltaic system. It also affects the normal use of the user's house.
So today we must discuss with you about the waterproofing of photovoltaic roofs.
How to set waterproof roof
The general principle of the roofing waterproofing treatment is: The guide should not be blocked, that is, to ensure that the node can smoothly let the water gulp out in the storm water and protect the roof from leaking.
For the case that holes must be broken to destroy the original roof, you must do it according to local conditions and do different treatments according to different circumstances. Let's look at the classification below.
Concrete flat roof waterproofing
For new constructions of concrete flat roofs, bolts are usually embedded at design time, and waterproofing of the roof is done according to conventional practices. For existing buildings, when installing the PV module base, the waterproof layer should be laid on the upper part of the base and the metal embedded parts, and be sealed around the anchor bolts. The waterproof layer should be filled with waterproof sealant. In addition, an additional waterproof layer can be added under the base. Even if the top of the base leaks, rainwater will not reach the structural layer.
Chemical anchor bolts use method
For existing buildings with concrete flat roofs, if chemical anchor bolts are used to fix the brackets, the thickness of the protective layer or surface layer should be confirmed first. For a prefabricated floor slab with a large bearing capacity per unit area, a concrete layer of a certain thickness may be cast on the roof, and after curing, the bracket may be fixed using a chemical anchor bolt.
For the slope roof of overlying tiles, the depth of drilling should be confirmed. After the chemical anchor bolts are fixed, the position where the bolts pass through the tiles should be treated with a waterproof sealant. Chemical anchor bolts have the advantages of large bearing capacity, fatigue resistance and aging resistance, no expansion force on the base body, and no extrusion stress, therefore, it will not cause adverse effects on the roof waterproofing.
Metal roof waterproofing
For metal roofs, the steel structure of the photovoltaic system needs to penetrate the original waterproof layer and profiled steel plate, and be fixed on the main steel structure of the building; refer to the metal roof waterproofing method, and conduct steam insulation, thermal insulation and waterproof treatment. The focus of the construction is to rust, seal, and apply waterproof coatings to the base and exterior.
Partial leakage points of metal roofs should be sealed with high quality neutral weatherproof sealants; for color steel sheets with severe local corrosion, they need to be replaced before installing PV modules.
Therefore, the installation design of PV modules must not only consider the sunshine and shadows, but also the issues of load-bearing, drainage, and waterproofing.
Stainless Steel Plain Dutch Weave Mesh, also known as wire mesh, it is made of high quality stainless steel wire. Similar to plain weave, it is weaved line by line. But for this kind of Stainless Steel Wire Cloth, the difference is the diameter of the weft is more thicker than the diameter of the warp. The weft wire is close together and then form a conical or wedge shaped hole. There is a big contrast between warp and weft wire diameter and density, so the net thickness and filtration precision and service life is significantly improved than common steel mesh. the filtering precision is running cannot be achieved for plain weave and Twill Weave Mesh screen.
Weaving: There are two kinds of weaving technology of Dutch woven Stainless Steel Mesh . One is plain Dutch knitting and the other is twill Dutch knitting. The weaving technology of Dutch woven stainless steel mesh combines Dutch knitting and twill weaving techniques. The coarser thread interleaved the finer threads, weaving each thread through the weft. The weft wire is closely aligned to form a cone or wedge open hole.
Features: Dutch woven stainless steel mesh features 4 points:
1."Zero" mesh, the warp wire diameter than the weft to the larger diameter.
2. Each weft is very tight
3. High precision, high liquidity
4. Filter more solid particles than square or rectangular mesh holes
Material: 201,302,304 (L), 310,316 (L), etc
Application: The Dutch weave Stainless Steel Wire Mesh is one of the best filter medium in hydraulic system, especially the spatial filtering critical applications, as well as the fuel and combustion chamber filter, sediment filter, vacuum filter, etc.
The warp wire (D1) : all longitudinal braided lines.
The weft wire (D2) : all horizontal weaving lines.
Aperture : the distance between two meridians or two weft.
Mesh number:number of mesh holes per inch.
Thickness (T) : thickness of wire mesh.
Specifiaction list:
Plain
Dutch Woven Stainless Steel Mesh
SPEC
NUMBER OF
HOLES PER INCH
WIRE DIAMETER
APERTURE(micron)
40
10mesh x 64mesh
0.55x0.42
260
50
12mesh x 75mesh
0.45x0.35
220
80
24mesh x 110mesh
0.35x0.25
160
100
25mesh x 140mesh
0.28x0.20
100
120
30mesh x 150mesh
0.25x0.18
80
140
35mesh x 180mesh
0.20x0.16
70
160
40mesh x 200mesh
0.18x0.13
60
180
45mesh x 220mesh
0.16x0.12
56
200
50mesh x 250mesh
0.15x0.11
50
240
60mesh x 300mesh
0.14x0.09
45
260
65mesh x 320mesh
0.13x0.08
36
280
70mesh x 400mesh
0.125x0.07
34
300
80mesh x 700mesh
0.11x0.039
32
Stainless Steel Plain Dutch Weave Mesh
Stainless Steel Plain Dutch Weave Mesh,Plain Dutch Weave Mesh,Fine Metal Mesh,Stainless Steel Woven Wire Mesh
Anping Xinzheng Metal Wire Mesh Co., Ltd , https://www.sievingmesh.com