A plate heat exchanger comprising a top head (2), a bottom head (3), four side panels (11,12,13,14) and four corner girders (21,22,23,24). The side panels (11,12,13,14) and the corner girders (21,22,23,24) extend along a longitudinal direction (4) from the bottom head (3) to the top head (2), and each side panel (11,12,13,14) is associated with two corner girders (21,22,23,24). The top head (2), the bottom head (3), the four side panels (11,12,13,14) and the four corner girders (21,22,23,24) are joined together to form a sealed enclosure for housing a plate pack (5) of stacked heat- exchanging plates (27). A continuous gasket assembly (6,7,8,9) is arranged in a contact region between at least one side panel (11,12,13,14) and two corner girders (21,22,23,24), the top head (2) and the bottom head (3). The gasket assembly (6,7,8,9) is located in a groove (46). Moreover, the gasket assembly (6,7,8,9) is a segmented gasket assembly (6,7,8,9) composed of a plurality of gasket segments, and each gasket segment is made of graphite material. The disclosure also relates to a method for assembling such a plate heat exchanger.
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