Install a Mid-Span Rail Post
Five easy steps to help you get that rail post done right.
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When using structural screws to install a mid-span rail post, be sure to follow the screw manufacturer instructions to meet code. First, reinforce the rim’s connection to the joist by driving a pair of 8-in. screws 1.5-in. from the top and bottom of the rim on either side of where the post will be installed. Second, tack the post into position. Third, cut two pieces of joist stock to serve as blocking and install behind the post. Fourth, secure each piece with a pair of 5-in. screws, driven 1.75-in. from the top and bottom of the joists on each side. Fifth, drive a pair of 8-in. screws through the rim and post and into the blocking. These screws are spaced 2 in. from the top and bottom edge of the rim.
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At about :45, one pair of screws driven thru the joist is offset, while the other pair is more or less in line. I think good practice calls for something like 1/2" offset to minimize splitting the grain of the joist. Since the force on the top of the post is out, the bottom screws into the blocking are doing the most work in resisting the force from the bottom of the post and will be acting to split the joist.
I prefer to install the posts from this video from Fine Homebuilding. It creates a very strong post. Stainless steel Simpson brackets will last much longer in wet, salty climates.https://www.finehomebuilding.com/?source=w2999enl&utm_source=eletter&utm_medium=eletter&utm_content=fhb_eletter&utm_campaign=fine-homebuilding-eletter