(57) A preformed multilayer structure for sealing coverings and roofings, formed by a
layer (1) of a bitumen-based blend embedding a framework (2), and by a layer (5) of
a preforming auxiliary material which forms the external surface thereof. An additional
resin layer (3) of elastomeric copolymers in water emulsion, and a further additional
layer (4) comprising a binder can be provided. The structure is incorporated in accessories of the building construction field of
various shapes and types (10, 15, 20, 25, 30, 38).
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