Abstract: The side-by-side panels of a standing T-rib roof can be provided in any necessary lengths due to a smooth telescopically interfitting arrangement lengthwise between adjacent panel sections. One end portion of each panel section is tapered without cutting or crimping the metal thereof and when slipped endwise into the untapered end portion of another panel section forms a smooth slip joint of uniform cross sectional dimensions in relation to the complete assembled panel. An improved clip for attaching roof panels to underlying purlins features a vertical standoff space between the clip attaching feet and lateral panel support branches thereabove so that a thermal insulation blanket can be placed in the stand-off space. This vertical stand-off space greatly decreases the thermal conductivity of the metal roof and, therefore, increases the thermal value.

Abstract: A skylight panel of fiberglass or other translucent material is integrated into a metal standing rib roof without loss of structural integrity in the roof system. The skylight panel is suspended in the roof system by a pair of formed suspension channels without the use of rivets or other like fasteners. The skylight panel is relieved of direct stresses caused by expansion and contraction of the roof system, and is protected from abrasion and wear caused by sliding contact with purlins or other metal parts. The skylight mounting means is characterized by simplicity and economy and is effectively sealed against leakage.

Abstract: A self-propelled roof T-rib cap flange closing or seaming machine has a base with guidance means to travel along the top of the cap strip. Cap strip closing dies on opposite sides of the machine having crowned tops and angled flange engaging leading faces are oscillated vertically about their rearward ends by drive motor and eccentric cam means on the machine. The crowned tops of the dies react against the formed flanges of the cap strip to advance the machine longitudinally of the standing rib for progressively closing said flanges.