Prefabricated Blocks for Roof Sealing
Prefabricated blocks for roof sealing mainly include the following types and their characteristics:
One roof-sealing method employs prefabricated channel steels and custom-made hollow bricks. In this approach, prefabricated channel steels are first placed sequentially on the roof as roof beams. The channel steels have a hollow structure in the middle, which not only reduces their own weight but also meets the building structure's need for cavities to some extent, such as facilitating pipeline installation. The channel steels extend outward by about two centimeters on both sides, and this extended part is used to place the bricks. The bricks are rectangular and hollow in the middle, with their dimensions custom-made according to the size of the house. They fit perfectly when placed between two channel steels, and no cutting is required at the edges, greatly improving construction efficiency and reducing material waste. After that, a layer of steel bars similar to thick iron wires is laid on top of the bricks. The steel bars can enhance the overall integrity and stability of the roof-sealing structure, improving its load-bearing capacity to cope with various possible loads, such as wind loads and snow loads.
In prefabricated buildings (prefab houses), prefabricated block technology is also used for roof sealing. This construction method involves pre-processing components such as columns, walls, and stairs required for the house in a factory and then assembling them on-site by hoisting, similar to building with blocks. This construction method is also applied to roof sealing and other related processes. For example, the renovation of Building 28 in Sanlihe Area 1, Beijing, took only 46 days from the hoisting of prefabricated components to roof sealing, fully demonstrating the advantage of prefabricated buildings in terms of construction speed. Through factory prefabrication, the quality and precision of components can be guaranteed, reducing errors and uncertainties in on-site construction, while also shortening the construction period and reducing the impact on the surrounding environment.
Traditional prefabricated slabs were commonly used as floor slabs in early 20th-century buildings. They are modules or panels used in engineering, which are concrete prefabricated parts produced and processed in a prefabrication yard and then directly transported to the construction site for installation. However, with the development of building technology and the increasing requirements for building quality and performance, this traditional prefabricated slab method for roof sealing has been phased out in modern house construction.
