(57) A heat insulating roof structure for an industrial building, in the form of an inter-purlin
system comprising spaced parallel purlins (10, 10A or 35, 35A or 45, 45A) which in
accordance with the invention have their base webs (14 or 41 or 50, 51) sheathed by
a heat insulating sleeve (16,17 or53,54 or 56, 57), thereby to provide lateral platforms
on opposite sides of the purlin for the support of cross members (29 or 70) which
form trays to support a layer of heat insulating material (31). In one form of embodiment
the cross members are inverted tee-bars (29), thereby forming open rectangularly framed
trays for supporting the insulating layer, In another form of embodiment the cross
members are closed tray bases (70) especially suitable for a vapour sealed system.
In all embodiments the insulating sleeve assembly (16,17 or 53, 54 or 56, 57) serves
to minimise or avoid the creation of a cold bridge between the warm building interior
and the cold space above the insulating layer (31).
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