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The important property of the waterproofing material

  • Author:Dongsheng-amber
  • Release on :2016-10-12

     The important property of the waterproofing material

Waterproofing membranes are made from several one or more layer materials such as rubber, elastomer, polyethylene,polypropylene, bitumen, polyvinyl chloride (PVC), polyurethanes, ethylene propylene diene monomer (M-class) rubber EPDM, silicate, bentonite clay, fabrics, fiberglass, cementious high-build coatings, composite layers, resin coatings, plastic sheeting, polymer liners, mastics and metal sheet.

The most important property of the waterproofing material is the material's water absorption rate. A satisfactory rate is below 4% (most materials are between 1-2%). Also important is the thickness of the material. Most manufactured materials have a uniform thickness making the application even and easy. The manufacturers state that their protective coatings are can be applied smoothly. This smooth, liquid-only appearance provides a monolithic application with no seams and therefore no weaknesses for cracks to form.

The material should also have some degree of flexibility and be able to resist differential movement. This is especially important for waterproofing membranes in structures that may move/settle.

The proper waterproofing system can only be determined after thorough analysis of the site area. This includes looking at the soil characteristics and water tables

Water table - The water table level is important because it determines not only the type of waterproofing required but whether waterproofing is required by code. The International Building Code requires that waterproofing be applied on all below-grade structures where the groundwater table is maintained a minimum of six inches below the ground slab. The water table test should be done when the water table is at its maximum.