Roof structure adjustable support frame system

A roof structure adjustable support frame system comprising:

• a plurality of joist rails configured to adjust longitudinally between existing roof joists;
• a plurality of side rails configured to extend longitudinally between the plurality of joist rails;
• a plurality of corner rail connectors configured to couple a side rail to a joist rail;
• and
• a plurality of adjustable joist rail connectors comprising a joist rail attachment configured to removably attach to an end of the joist rail, an extension support member extending longitudinally from a first end of the joist rail attachment, a hook assembly configured to move longitudinally along the extension support member and engage a roof joist to couple the joist rail to the joist;
• and a movable stop configured to secure the hook assembly against the roof joist;
• wherein the plurality of joist rails are coupled to the existing roof joists with the plurality of adjustable joist rail connectors;
• and
• wherein the plurality of side rails attach to the plurality of joist rails with the plurality of corner rail connectors.