Posted by MarkB_MI on July 11, 2014 at 02:55:26 from (70.194.9.137):
In Reply to: Roof support info. posted by 37Chief on July 10, 2014 at 20:45:22:
Doubling the ridge board will make it twice as strong and twice as stiff. But removing the center post will require you to make your ridge board about four times heavier because you've doubled the span. Not only does each post have to support fifty percent more weight than before, you've doubled the average moment arm for the force. Think of it this way: Suppose you apply 10 pounds of force on a one foot long lever: that's 10 foot pounds of torque. Now put 15 pounds on a two foot long lever: you now have 30 foot-pounds. (Some structural engineer is going to come along and rip me apart, because this is nowhere close to an accurate analogy to your roof, but I'm just trying to show you why your ridge board needs to be much stiffer.)
If you double it with a pair of 2x8s, you might be getting close. I'd go with a pair of pressure-treated 2x10s. (Pressure-treated because I assume this will be exposed to the weather, and because pressure-treated lumber in most parts of the country is southern yellow pine, which is very strong). Alternately, you might want to support the ridge with an I-beam. 16 feet is a very long span.
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