Step Three
OK, here's where the fun begins. Following the drawing below attach all four sides and ends to the loft floor using 2" sheet rock screws or flooring nails. Be very careful to ensure your sides and ends go on square, level, or what ever you want to call it. A second person comes in handy here.
Lay the front, ends, and back pieces on the ground as shown.
I like to start with the two back pieces first, then the two ends, and then the front. The best thing to do is to hold off on the front for a while until you finish off the back corners and cut your door. Also, DO NOT screw or nail the bottom of the door permanently. You can put a few screws in to help hold the end but these screws will need to come out later.
This drawing shows how to attach the ends and sides to the floor joist's. Make sure the pieces are square and level and even with the bottom of the floor joists. Use 2" sheet rock screws or flooring nails about every 6".