Roofing waterproofing systems

R. Bynum, Insulation Handbook, McGraw-Hill Professional, New York, NY, USA, 2000. Hertalan EPDM Roof Waterproofing System, Hertelan, WATFORD, UK, 2001, 3. 

Ethylene-Propylene-Diene-Monomer (EPDM) Rubber. The main properties of EPDM are its outstanding heat, ozone and weather resistance, as well as its electrical insulating properties. EPDM rubber finds use in vehicles (weather seals in windows and trunks, cooling system hoses), in safety equipment (seals in respirators), roofing (waterproofing of roofs), and playground surfacing. 

Our product lines feature high-quality concrete admixtures, specialty mortars, sealants and adhesives, silicones, damping and reinforcing materials, structural strengthening systems, industrial flooring, roofing and waterproofing systems. 

In the traditional waterproofing systems, bitumen (or bituminous felt) was used commonly in the so-called built-up roofs. Since the introduction of plastic films, sheets of mainly... 

PVC and PE have played a major role in the shift of early roof waterproofing technology and materials. After the introduction of elastomeric and other thermoplastic materials, flexible membranes of polychloroprene (Neoprene) rubber, butyl rubber and Hypalon were used. Later on, liquid PU, solvent-based liquid acrylate and liquid EPDM systems, in addition to new materials like SBS modified bitumens, were also used in the management of roofing. All fall into the single-ply family of roofing, which offers a much cleaner, safer, energy-efficient and cost-effective alternative to built-up roofs. 

In many countries asphalt felt coating is used to protect the building roof from leaking -the life of such a waterproofing system is only two to three years. For exceptional water and weather resistance the EPDM roof membrane is known to be serviceable for more than 20 years and virtually no maintenance is required. 

Vector SBS, SIS, and SB styrenic block copolymers are produced as diblock-free and diblock copolymers. The company s process to make linear SBCs yields virtually no diblock residuals. Residual styrene butadiene and styrene isoprene require endblocks at both ends of the polymer to have a load-bearing segment in the elastomeric network. However, diblocks are blended into the copolymer for certain apphcations. Vector SBCs are injection molded, extruded, and formulated into pressure-sensitive adhesives for tapes and labels, hot-melt product-assembly adhesives, construction adhesives, mastics, sealants, and asphalt modifiers. The asphalts are used to make membranes for single-ply roofing and waterproofing systems, binders for pavement construction and repair, and... 

Waterproof. Waterproofing barrier systems may be either hot- or cold-appHed. The hot-appHed generaUy involve a bituminous material such as asphalt used in conjunction with a reinforcing fabric such as roofing felt, cotton, or glass cloth. Cold-appHed can be bituminous or elastomeric materials either in Hquid or sheet form, with or without fabric reinforcement. Liquid elastomeric treatments include neoprene, polyurethanes, and blends of these or epoxies with bituminous materials. Among the commonly used precured elastomeric sheet materials are neoprene, polyisobutylene, EPDM mbber, and plasticized PVC. Polyethylene and PVC films and nonwoven plastic or glass fabric coated with bituminous materials also find use (78). Because these... 

A composite concrete slab or a stressed-skin system can also provide a roof diaphragm, but the latter may severely restrict the provision of subsequent roof penetrations. Concrete roof slabs are unusual, due to the greatly increased mass over the more normal metal decking/in-sulation/waterproof membrane or insulated metal decking options. 

Several sections of this chapter discuss building materials (hoses and pipes, pavement, roofing, sealants, siding, and waterproofing). Here, we focus on wall materials and insulation in various extruded and molded profiles. Numerous polymers are used for these two applications. They include polystyrene, phenolic resin, polyvinylchloride, and polyurethanes for insulation purposes and polyvinylchloride, polyurethanes, and polyesters for wall systems and structural elements. The major methods of production include molding, extrusion, and pultrusion. 

A construction site will have many people working on a building project throughout the construction period. The groundwork people lay the foundations, the steel work is erected, the bricklayers build the walls, the carpenters put on the roof and, only when the building is waterproof do the electricians and mechanical service trades begin to install the electrical and mechanical systems. 

To meet these desirable properties, the appropriate polymer to consider would be ethylene - propylene-diene terpolymer (EPDM). In the manufacture of a cost effective, impermeable membrane system, EPDM rubber is the right choice as a discreet material for improved waterproofing and protective lining applications in roofing and other uses in the construction sectors [125]. 

Ballasting is an economical and quick system to secure an EPDM roof membrane. Waterproofing sheet is simply fitted over the flat roof or to a low slope, and covered with cleanly washed well rounded gravel with a diameter of 40-50 mm. Corners may be ballasted with suitable concrete slabs to prevent the sheeting from wind uplift and the perimeter can be fixed with contact adhesive. 

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