Interaction between plasticized polyvinyl chloride waterproofing membrane and extruded polystyrene board, in the inverted flat roof


  • A. Pedrosa Universidad Politécnica de Madrid
  • M. Del Río Universidad Politécnica de Madrid
  • C. Fonseca Universidad Politécnica de Madrid



Inverted flat roof, Extruded polystyrene board, Waterproofing, Plasticizers migration, Single ply membrane


The inverted flat roof is a constructive system widely used in flat roof construction. In this constructive solution, the insulation is placed over the waterproofing material as a protection. It is believed that this solution provides a longer life cycle; given the fact that it limits the thermal variation the waterproofing material bears up to the end of its life cycle. Consequently, the result will be providing a longer life to the waterproofing membrane. This constructive solution always incorporates polymers or other materials with a thermoplastic addition in their composition. Some polymers show interactions between them that can affect their integrity, and, at the same time, the bulk of the polymeric materials are incompatible. The extruded polystyrene board is always present in the inverted flat roof, and although it is an unbeatable product for this use, it presents incompatibilities and interactions with other materials, and these can affect their properties and therefore the durability of them.


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How to Cite

Pedrosa, A., Del Río, M., & Fonseca, C. (2014). Interaction between plasticized polyvinyl chloride waterproofing membrane and extruded polystyrene board, in the inverted flat roof. Materiales De Construcción, 64(316), e037.



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