PURPOSE: To safely and exactly construct a roof heat-insulating structure having high efficiency by a method in which a resin laminate sheet is placed in a slackened state on vertical crosspieces set on a rafter, a tile base is set, and tiles are placed on the tile base.

CONSTITUTION: A given form of expanded heat insulator 9 is set through a recession 8 on a rafter 1, a waterproof sheet 4 is placed on the heat insulator 9, and vertical crosspieces 10 are set along the rafter 1. A resin sheet 2 is then placed with a slackened space between the crosspieces 10 to form an air-passing layer 6 through which warmed air can go out. A tile base 11 is placed on the crosspieces 10, and tiles 5 are set by coupling them to the crosspieces 10 finally. Heat-insulating efficiency can thus be raised because radiation heat from roof can be shielded.