Re: OT - Post Beam barn rework

Posted by jdemaris on January 12, 2007 at 06:52:59 from (69.67.229.131):

In Reply to: OT - Post Beam barn rework posted by Jon (IN) on January 11, 2007 at 11:41:16:

You didn't post any photos of the upper section where the rafters are. I've had fix many post & beam barns - I still own two that were built 1820-- 1850. The house I live in is also mortise and tenon and was built 1820. Although most of these old barns have almost non-existant foundations other than a few rocks piled on the ground, the area that usually does them in is up above. A gable-two-pitched roof puts tremendous outward pressure on the top-sides of the barn. I.e., the bottom of the triangle bellies out as gravity pushes vertically down on the ridge-peak. Something must be there to serve as a "collar-tie." Most of these older barns were held together with a few wood pins at these points. And, most pins, along with the tenon joints rotted out years ago. So, sideways cabling is the easiest and safest. 3/8" cable between each set of upright beams works fine. If this is a "one man" operation, this is how I do it. Wrap something protective around the top-upright where you are going to loop the cable around. Otherwise it will cut into the wood. If the wood is gone or rotted, scap some new wood in. Then, after the cable is looped around it and fastened with a couple of bolt-on cable clamps - run it sideways to the opposing upright on the other side. Loop the cable around and then part way back (maye half-way) and put a temporary loop on the end. Then, hooked a come-along to that loop back to the first top-post you were working on. Then, crank the cable tight - or beyond tight if the barn-sides need to be drawn back in to a certain point. When it is where you want it - just install some double cable-clamps and then cut off the remains of the cable (or just leave it if you want).
Of course - use some common sense. It won't be fun if the barn comes down with you in it.

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