Abstract: A stitch nailing apparatus for automatically sequentially placing transversely extending slats in predetermined spaced relationship with one another onto a plurality of longitudinally advancing stringers and for repetitively nailing each slat to the stringer in stitch nailing fashion, immediately following its placement thereon. A first conveyor, mounted on an elongated frame, advances and guides a lowermost stringer longitudinally of the elongated frame from each of a plurality of spaced stringer magazines. The plurality of advancing stringers simultaneously proceed in spaced parallel relationship to a nailing station wherein a separate nailing head is adjacent each stringer. A slat magazine, disposed between the nailing heads and the stringer magazines, holds a vertical stack of slats. A slat conveyor advances the lowermost slat from the slat magazine to a position transversely overlying the stringers at the nailing station.