Roof structure

A roof for a building, the roof comprising:

• a ridge beam defining an upper edge of the roof;
• a first eaves beam defining a lower edge of the roof;
• a first panel connected to both the ridge beam and the eaves beam, and spanning the distance therebetween and extending over at least a first portion of the area of the roof;
• and
• one or more retention structures positioned relative to the first panel and one of said beams and configured to clamp said panel against the other of said beams,
• wherein each of the one or more retention structures comprises a mechanically-operable jack mechanism configured to urge apart the first panel and the one of said beams relative to which the retention structure is positioned, so as to urge the first panel towards the other of said beams,
• wherein each of the one or more retention structures further comprises a first strut member and a second strut member, each strut member having a first end and a second end, wherein the first end of the first strut member is coupled to the first panel and the first end of the second strut member is coupled to the one of said beams relative to which the retention structure is positioned;
• wherein the first and second strut members are hingedly attached to one another about their respective second ends by a pivot;
• wherein the pivot is operable by the mechanically-operable jack mechanism so as selectively to urge apart the first ends of the strut members to urge apart the first panel and the one of said beams relative to which the retention structure is positioned and to urge the first panel and the one of said beams relative to which the retention structure is positioned towards each other.