In waterproofing construction, a small, seemingly inconspicuous item is often used but plays a significant role — compound base (non-woven fabric reinforcement layer). Why is a compound base used in waterproofing work? What function does it serve?
People make the compound base, also known as non-woven fabric, needle-punched cotton, etc., from oriented or randomly arranged fibers. They call it a ‘fabric’ because of its appearance and certain fabric-like properties. It has moisture resistance, breathability, flexibility, light weight, non-flammability, easy decomposition, non-toxic and non-irritating nature, a wide range of colors, low cost, and recyclability.
What is the function of combining waterproof coatings with a compound base?
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Used at detailed junctions as a reinforcement material: Because of its moisture resistance, breathability, and flexibility, the compound base can tightly integrate with waterproof coatings. Its most critical function in waterproofing is reinforcement and crack prevention. At detailed junctions — such as pipe penetrations, internal and external corners, and gutters — where differential settlement or structural thermal deformation occurs, the compound base helps prevent cracks and leaks that might result from coating film damage.
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Enhances tensile strength and uniformity of the coating: Laying a compound base not only increases the tensile strength of the waterproof coating but also improves the uniformity of membrane thickness. When applying waterproofing materials over large areas, the presence of a reinforcement layer requires sufficient and evenly applied coating material. Otherwise, problems like incomplete impregnation of the compound base can occur.
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Prevents coating sagging:Gravity causes waterproof coatings to flow downward on sloped surfaces like bridge decks. The compound base retains part of the coating and prevents it from flowing randomly, thereby increasing resistance to downward movement. For coatings with long curing times and low viscosity, applying an additional compound base layer can further ensure the waterproof membrane’s quality.
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