Roof (1) having a slope (2) of the roof comprising purlins (3) with an inverted T cross-section to delimit, on either side of the vertical branch (5) of the T, a re-entrant angle (6), a structure (7) support purlins (3) configured to support the failures (3) inverted T in a position in which they rest, by the horizontal branch (4) of the T, resting on the structure (7) support, at least one thermally insulating panel (8) positionable between two failures (3) and at least one coverable positionable covering plate (9) of the thermally insulating panels (8). At least one of the T-shaped purlins (3). inverted comprises two beams (10, 11) forming one (10), the horizontal branch (4) of the T, the other (11), the vertical branch (5) of the T and a seal (12) is taken into sandwich between said beams (10, 11), this seal (12) extending in overflow from the vertical branch (5) of the T and at least partially overlapping the branch (4) hori zontal of T.
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