narrower concept air-supported roof Concept collar-beam roof Concept connecting joint Concept domed roof Concept flat roof Concept glass roof Concept hipped roof Concept incline Concept inverted roof Concept monopitch roof Concept non-ventilated roof Concept purlin roof Concept rafter roof Concept roof boarding Concept roof construction Concept roof deck Concept roof design Concept roof form Concept roof framing Concept roof pitch Concept roof structure Concept roof system Concept roof truss Concept roof waterproofing Concept saddleback roof Concept saw-tooth roof Concept shell roof Concept shell roof Concept sub-construction Concept suspended roof Concept suspended truss Concept tent roof Concept three-hinged girder Concept tilted Concept truss girder Concept ventilated roof Concept