Abstract: A joist installation assisting device to assist with the installation of a joist on a ledger board or similar device. The joist installation assisting device being constructed of a durable material and being generally u-shaped, such that a pocket is formed for placement of a joist hanger, and then a joist therein. The joist installation assisting device further comprising an upwardly projected point for the quick accurate placement of the device upon the ledger board. The joist installation assisting device having a plurality of openings therethrough for attachment and detachment to the ledger board by anchoring devices. An adjustment mechanism member being positioned in a vertical y-dimensional axis to contact with the lower portion of the joist to allow for precise positioning in the y-dimensional axis prior to securing and installation of said joist.