Specs for a Half Lap Joint.


Old 08-17-15, 04:34 PM
Thread Starter
Join Date: Sep 2004
Location: St. Peters MO
Posts: 52
Received 0 Votes on 0 Posts
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.
Sponsored Links
Old 08-17-15, 04:54 PM
Temporarily Suspended
Join Date: Jul 2008
Location: NY
Posts: 10,986
Received 0 Votes on 0 Posts
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.
Old 08-17-15, 04:55 PM
Join Date: Jan 2011
Location: USA
Posts: 4,560
Received 42 Votes on 37 Posts
And your right, pictures would be great.
There is no need for plates of it's cut right.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Ask a Question
Question Title: