Specs for a Half Lap Joint.

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Old 08-17-15, 04:34 PM
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Specs for a Half Lap Joint.

Without pics this could be difficult to explain.

My deck is covered and screened in and is above a walk out basement. The 8x8 posts that support it from the ground all the way through the deck and up to the roof. I believe some of the posts are supported by the concrete patio and not actual footings. To make the deck safe I want to do the following.

Support the deck with temporary posts.

Cut the Post approx 5 feet up from the concrete slap to allow space for a two man auger to fit under the post.

Remove the concrete slab where the post was and dig a 36"x10"diameter proper code post hole.

Use a plumb bob to put a perfectly placed bracket and footing below the post and Half lap the old post with a new post.

Does this sound like a safe fix? If the post only supported the deck I would just replace it. But that is not an option since it supports the roof as well. The outer posts also make up the deck rail so would make for an expensive repair.


What size should the joint be? I was planning on a about 12 inches high if that makes any sense. And then thought about obtaining some 1/8 galvanized plates to attach to the sides with holes for the bolts to go through for added strength. Also ad some construction adhesive as well.

Ty for any help.
 
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Old 08-17-15, 04:54 PM
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I did a similar job. It's not a good idea to split the posts. Use temporary posts between the ground & the deck & another set of temporary posts between the deck & the roof. That way you don't have to split anything.
 
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Old 08-17-15, 04:55 PM
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And your right, pictures would be great.
There is no need for plates of it's cut right.
 
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