In modern society, the use of fiber cement board, as curtain wall, is quite a lot. So, what are the specific types? At the same time, what are the specifications that need to be met when designing? In this regard, Xiaobian specially collected some information. Below, let's have a look!
1.1 The seam width of the sealant sealing plate shall be able to meet the requirements that the adjacent panels shall not touch due to the horizontal lateral movement of the main structure and the supporting structure, the displacement of the panel caused by the temperature change, and the temperature expansion of the plate itself, and shall not be less than 6mm.
1.2 The sealant should be selected according to the material of the curtain wall panel and the design requirements of the joint, and the depth of the joint should not be less than 6 mm.
1.3 The bottom of the plate seam should be filled with foam strips to prevent the sealant from sticking on three sides.
Description of the provisions:
The joint of the closed fiber cement panel curtain wall should have a certain width to ensure the deformation requirements of the curtain wall members and the main structure.
Commonly used seam sealants are: silicone, modified silicone or polyurethane sealant three categories. Silicone sealant should be selected according to the material of the panel fiber cement board, and polyurethane sealant can also be used. Before use, it is appropriate to carry out pollution test to prevent pollution of the panel and affect the appearance.
According to ASTM C1193-00 "Standard Guide for Use ofJoint Sealants" fiber cement panel curtain wall commonly used seam size of 6-13mm width. Therefore, paragraph 2 of this article stipulates the minimum depth of glue joints, which shall be designed and determined according to the actual situation in specific projects.
Sealant three side bonding, will directly reduce the displacement capacity of the sealant, easy to tear, the thickness and width ratio of the sealant, related to the displacement capacity of the sealant, too thin waterproof capacity is low, too thick will reduce the displacement capacity of the sealant, easy to pull. The ratio of width to thickness is 2:1.
Because the thickness of the fiber cement panel is relatively thin, the use of deep adhesive joints, pay attention to the distance between the outer surface of the adhesive joint and the surface of the panel, the distance is too small, the appearance can not meet the requirements, the thickness of the sealant is too thin, and the bonding force of the panel will be reduced, reduce the waterproof ability of the adhesive joint and even leakage.
Therefore, when determining the distance between the surface of the deep adhesive joint and the surface of the panel, it should be determined according to the thickness of the panel and the width of the joint.
2.1 EPM, neoprene and silicone rubber products should be used for sealing strips, and should comply with the current national standard "Sealing strips for building doors, Windows and curtain walls" GB/T 24498.
2.2 The "cross" joints between curtain wall panels or unit plates shall be specially designed and necessary structural measures shall be taken to prevent rainwater infiltration.
2.3 When sealing the joint of the unit plate, it is appropriate to use multiple rubber strips for sealing.
Description of the provisions:
Rubber seal for plate seam sealing shall have good weather resistance. The "cross" joint between the curtain wall panel or the unit plate is the part that is prone to rain leakage. When designing the "cross" joint position of the plate seam, we must attach great importance to it and adopt appropriate measures to prevent leakage.
It is an effective structural measure to improve the watertight performance of curtain wall that the joint of unit plate is formed by multiple sealing strips.3.1 Curtain wall plate seam width should not be less than 8 mm.
3.2 The space behind the panel should prevent water accumulation and take effective drainage measures.
3.3 The insulation material on the back of the panel shall be waterproof and ventilated, so that the moist water vapor can be discharged smoothly.
3.4 The supporting structure and metal connectors shall take effective anti-corrosion measures or be appropriately thickened to reserve corrosion.
4.1 The minimum lap width of the panel shall meet the requirements of anti-seepage to prevent a large amount of rainwater from infiltrating into the curtain wall. The back space should be prevented from standing water and effective drainage measures should be taken.
4.2 A certain relative displacement gap shall be reserved between the panel and the embedded strip.
4.3 The vertical plate joints shall adopt the curtain wall of the block type, while the horizontal plate joints shall adopt the slit type or lap type.
4.4 The curtain wall of the block type shall be adopted for both vertical and horizontal plate joints. Air inlet and air outlet with a certain ventilation area shall be set at the bottom and top of the curtain wall to form an effective back ventilation space.
4.5 The insulation material on the back of the panel shall be waterproof and ventilated so that the moist water vapor can be discharged smoothly.
4.6 The supporting structure and metal connectors shall take effective anti-corrosion measures or be appropriately thickened to reserve corrosion.
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