Starting in the corners, use your nail gun to nail the panels down onto the joists. Once the four corners are nailed, put another four nails in for each middle joist and five for the end joists. To make sure you hit the centre of each joist, use your straight edge to draw nail lines on top of each panel. If your joists are hardwood, you may need to knock your nails in a bit further with a hammer. Continue this process across the whole floor, staggering your panels so the join of one pair of panels meets up with the middle of a panel in the next row.