Add vertical rebar to deck footing after drying?

Reply

  #1  
Old 07-24-19, 12:06 AM
Member
Thread Starter
Join Date: Jul 2019
Posts: 2
Received 0 Votes on 0 Posts
Add vertical rebar to deck footing after drying?

I'm in the process of building a deck. Originally, for several reasons, my footing and post approach was to dig down below the frost line, pour about 8" of concrete, and then put my treated posts on the concrete and then backfill with dirt or gravel. According the Intl Building Codes, this is an acceptable approach:



After thinking about this more and researching it more, I'm worried about the longevity of this approach even with treated wood. So I have decided to shift gears to do something else. I'm now wanting to do this instead:



Now, the problem is that I've already dug and poured my footings. I'm talking about ONLY the large flat 8" footing in the first diagram. Not the pier as in the 2nd diagram. So I'm wondering, is it okay to pour a pier on top of an already dried footing? It is possible this could create some sort of unintended air gap between the two? Obviously if I had taken this approach from the beginning I would have poured it all at once but its too late for that.

Also, in order to help improve the connection between the dry footings and the new piers, I was thinking about drilling into the footings and putting in a few pieces of rebar sticking out vertically. Then I would pour my pier (using a Sonotube or something) centered on the rebar. So that would hopefully help tie them together better. My question here, is it okay to drill out and put in rebar into the dry footing? Do I epoxy it in there or what? Obviously it would have been best to put in the rebar at the same time as the footing but again, too late.

Can anyone give me some guidance here? Thank you in advance.
 
Sponsored Links
  #2  
Old 07-24-19, 01:59 AM
Marq1's Avatar
Member
Join Date: Sep 2016
Location: USA MI
Posts: 4,826
Received 144 Votes on 133 Posts
Although I would do differently today your approach is basically what I did for my deck although the depth of the pier was about a foot below grade.

For structural strength it's never good to have a cold joint in concrete and the rebar will not fully resolve.
 
  #3  
Old 07-24-19, 06:08 AM
Member
Join Date: Nov 2011
Location: USA
Posts: 699
Received 2 Votes on 2 Posts
I think your good, like having a stone on stone foundation some have lasted many years. The rebar would be better for side movement depending on how you sealed it in. Good luck.
 
  #4  
Old 07-24-19, 07:39 AM
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 21,442
Received 305 Votes on 279 Posts
If you really want your rebar pins to hold in the old/existing footer I would epoxy them in. There are special epoxies intended for anchoring bolts in concrete. The added uplift protection wouldn't hurt if you are in a coastal/high wind area.
 
  #5  
Old 07-24-19, 08:24 AM
Member
Thread Starter
Join Date: Jul 2019
Posts: 2
Received 0 Votes on 0 Posts
I'm in Colorado so not much of an issue with wind here. Would the rebar only really be adding uplift protection?
 
Reply

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:
Description: