Detailed Explanation of 18j621-3 Ventilation Skylight Installation and Acceptance Standards
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As a replacement for the national building standard atlas 05J621-3, 18j621-3 ventilation skylight specifies the installation, construction, and acceptance requirements for ventilation skylights in industrial and civil buildings. It is the core basis for ensuring the safe use of skylights and improving ventilation efficiency. The following explains the key specifications and standards in conjunction with the core content of the atlas.
I. Core Specifications for Installation and Construction
The selection of materials must strictly follow the 18j621-3 ventilation skylight atlas requirements. The skylight frame and steel base should preferably use Q235-B type steel or steel plate. When the wind pressure resistance strength is >1.0kPa, Q355B material should be selected, and the welding rod should match the E43 type. The outer guard plate adopts 0.6 thick profiled steel plate or 1.5 thick glass fiber reinforced plastic lighting board. The galvanizing amount in coastal areas needs to be ≥150g/m². Stainless steel or aluminum alloy materials can be selected when the anti-corrosion requirement is high.
The installation process needs to be promoted in modular combination. The skylight frame spacing is controlled at 3000mm or 4000mm. When the combined length exceeds 60m, an inspection door needs to be added, and an inspection ladder should be installed at the end when the height is >2m. The connection method can be steel plate base type or channel steel beam type. When fixed to the roof, steel plate embedded parts need to be pre-embedded, and the gaps are fully coated with sealant to ensure waterproofness. The drainage design needs to ensure that the distance between the spouts of the gutter is ≤24m, and snow melting and de-icing protection measures need to be added in northern areas.
II. Key Points of Acceptance Criteria
Acceptance needs to comply with a number of national standards such as the "Unified Standard for Quality Acceptance of Building Construction Engineering". In terms of manufacturing accuracy, the diagonal error of the industrial plant smoke and ventilation skylight frame is ≤±1.5mm per meter, and the plane distortion of the frame does not exceed 5.0mm. Performance testing needs to focus on checking the wind pressure resistance strength (1.0-1.2kPa), snow load bearing capacity (0.2-0.6kN/m²), and the waterproof performance needs to pass the water shower test without leakage.
The material quality needs to check the product qualification certificate, stainless steel needs to meet the GB/T 4237 standard, and aluminum alloy should use 3004 plate and 5754 profile. Installation acceptance also needs to check the electrical control part (24V safety power supply or solar cell), fire linkage function (intelligent skylight) to ensure flexible and reliable opening and closing mechanism.
Following the 18j621-3 ventilation skylight atlas specifications for construction and acceptance can effectively avoid problems such as leakage, abnormal noise, and substandard performance of ventilation skylights, and extend the service life. In actual operation, it is necessary to combine the engineering design documents, and focus on controlling the material quality, connection firmness and waterproof sealing effect.
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