Key Construction Points for Roof Layers such as Vapor Barrier, Thermal Insulation Layer, and Waterproof Underlayment
When constructing a metal panel roof, the installation of the vapor barrier, thermal insulation layer, and waterproof underlayment is crucial. First, the overlap width of the vapor barrier material must be at least 100mm, and sealed with sealing tape. Simultaneously, roof openings and surrounding areas must be sealed. Second, the installation of thermal insulation materials must be carried out simultaneously with the metal panels, waterproof underlayment, and vapor barrier. During installation, it should be straight, flat, and tight, ensuring that the thermal insulation layers at the ridge, eaves, and gables are integrally connected to the roof. Furthermore, the installation of sound-absorbing and sound-insulating materials for the metal panel roof must comply with relevant standards. Finally, the installation of the waterproof underlayment for the metal panel roof also needs to follow relevant standards.
Key Construction Points for Metal Panels
The construction process for a metal panel roof includes several steps: cleaning the base layer, matching panels, laying and nailing the metal panels, and inspection and acceptance. Before construction, a detailed layout design must be developed based on the construction drawings, and the metal panels must be laid according to the technical requirements and layout plan. Simultaneously, the hoisting, storage, and on-site inspection of the metal panels are crucial aspects. Specialized hoisting tools must be used, and rainproof, moisture-proof, and fireproof measures must be taken to ensure the panels are not damaged during transportation and stacking. Incoming color-coated steel plates and strips must be tested for multiple performance indicators, such as yield strength and tensile strength, while metal-faced insulating sandwich panels must be tested for peel performance and bending load-bearing capacity.
All components and accessories of the metal panel roof must have product qualification certificates and performance test reports before construction to ensure that their material quality, specifications, and performance meet design requirements and relevant product standards. The selection of the metal panel length must comprehensively consider multiple factors such as the roof drainage slope, panel connection method, ambient temperature difference, and hoisting and transportation conditions. Furthermore, the maximum length per slope should be determined with reference to relevant specifications. In addition, the fasteners used when laying the metal panels must also meet design requirements to ensure the stability of the installation. For metal flashing, its length should not be less than 2 meters, and it must be installed straight without bending or twisting.
When laying metal panels, the first step is to install fixing brackets on the purlins, ensuring that the connection between the panels and the brackets meets the quality requirements of the panels used.
The construction measurements for the metal panel roof must be consistent with those for the main structure. Any errors should be corrected promptly to avoid accumulation. Furthermore, the installation positioning reference points for the metal panels should be checked regularly during construction to ensure accuracy.
When using the edge-cutting method, ensure the seams of the upper and lower panels are aligned; if the non-edge-cutting method is chosen, the seams of the upper and lower panels should be staggered by one wave crest, as shown in the figure.
The installation of roof panels should begin at one end and proceed towards the ridge from the other end.
