I need help! I am building a garage 24'x28' and i am planning on using the above for storage. I will have 2x8 floor joist spanning the 28 feet and a 6x12 beam spanning the 24 feet. Do I need a post in the center of the 6x12 to help support the weight or is a 24 foot span on 2x6 framing enough support. please help.

I was wondering if anyone could give me some suggestions on this problem: My garage door opener will open but not close. It will only close if you hold your finger on the wall button the entire time. Otherwise it goes 2 inches down, then stops, backs up, and flashes the light bulbs on and off. The infrared electronic "eyes" installed at the base of the door can see each other ok, no obstructions, and both green led's are on. I have oiled all hinges with WD-40 as the manual suggests. I have tried increasing the downward force with the knob located on the unit but same result even it I max it out. I've also tried adjusting the downward limiter. The door is aluminum, two car garage type. This opener was new in August of 1995 and worked fine for 9 years, then suddenly this cropped up. I've seen other responses to this issue posted saying the door sensors are the culprit, but in my case both sensor lights are green. They stay green even if you put your foot in front, (should the color change if obstructed?) Here is the specs on it: Sears/Craftsman 1/2 HP Volts: 120 Amp: 5.0 Hz: 60 Model: 139.536415RT Chain Drive Thanks for any help. Jim