Pergola bracing help

Old 04-03-14, 08:38 PM
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Pergola bracing help

What is the proper way to connect a 4x4 knee brace to a 6x6 post to prevent wobble or racking? Do I need more than 1 bolt at top connection between girders and should I use lag bolt at the post or must it be a thru bolt? Is 18" down the post enough to be effective?

Thanks in advance
Old 04-04-14, 12:06 AM
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Through-bolts are always more effective than lag bolts for connecting bracing. For several reasons, probably the main one being that when things loosen up over time (as wood shrinks and swells with changes in moisture content or temperature), tightening through-bolts will actually tighten the connection, while trying to tighten lag bolts will often result in the bolt stripping out the internal wood threads, making the connection worthless. Using 2 bolts instead of 1 at the top connection means there's less likelihood of any rotation taking place. The depth down from the top of the connection depends on the length of the column--18" would probably be minimum, but taller columns would certainly warrant at least 24", which is what DCA 6 recommends.

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