(57) A flat covering structure (1) including a load-bearing purlin structure (2), a lower
facing of staves (5) located side-by-side and aligned in a first direction on said
load-bearing structure (2) and secured thereto in any suitable manner, the said staves
(5) having a substantially flat mid-portion (9) and longitudinal edges (12, 13) that
are bent with respect to the said mid-portion (9) and are designed to extend upwards,
in use, an upper covering surface (6) of metal sheet elements (7) to be laid on the
said staves (5) crossways with respect to the said first direction and to be anchored
thereto thereby delimiting with the said staves (5) a gap (33) arranged to receive
a layer of thermally insulating material (44) and a plurality of removable locking
blocks (8) arranged to anchor the said metal sheet elements (7) to the said staves
(5). Each one of the said removable locking blocks (8) comprises blocking means (26,
27; 46) designed to connect the said side-by-side longitudinal edges (12, 13) belonging
to two adjacent staves (5), as well as securing means (35, 36) designed to couple
two adjacent metal sheet elements (7), thereby obtaining direct anchoring, in use,
between the said staves (5) and the said metal sheet elements (7).
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