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Step Four
In this step we will screw the two back pieces of OSB together, attach the two back corners, and add some trim. I use 1X4 fir utility I get for a dollar each. But you can use any kind of 1X4 material. Before you start this step go out and buy 5 lbs of 1-1/4" x 6 sheet rock screws as we will be using them for almost every thing to come. Be careful when screwing in the screws, if you go to deep with them they will penetrate the back side of the boards. Look at the left drawing below. Clamp a 1X4 (A) along the top edge (but down about 1/4 inch from the edge) of the two back pieces of OSB and from the inside of the loft screw the OSB to the 1X4. I use 6" spacing for these screws. Next from the outside of the loft screw one of the 78" 1X4s (B) up the center of the back wall dividing the two pieces of OSB evenly. Just attach this using only a couple of screws. Now go inside and screw the two edges of the OSB to the 1X4 using one row of screws in each piece on 6" spacing. We will come back to the back pieces later. Now look at the right drawing and lets work on the ends.
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Cut a 1X4 (D) to fit along the top edge from the peak back. Clamp and screw the OSB to it from the inside. Do the same to the other end. Now cut a 1X4 (E) and attach it once again with screws from the inside along the back edge, making sure the edge of the 1X4 is even with the edge of the OSB. Do the same to the other corner. If you looked at the corner from the top it should now look like this.
Now your going to attach the two last pieces if 1X4 trim (C) to the two back corners like this.
Use your screws from the inside and some 2" finishing nails from the out side going through piece C into piece E. Do the same to the other side. You now have your two back corners done. They should be nice and solid and hopefully straight.
