Is It SAFE Not To Use Deck Post Concrete Anchors? - Building & Construction - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction


Thread Tools Search this Thread
Display Modes
Old 06-28-2010, 06:53 PM   #1
Join Date: Jun 2010
Posts: 1
Rewards Points: 10

Is it SAFE not to use deck post concrete anchors?

Is it SAFE to just place the bottom of the posts on concrete footings WITHOUT using any deck post concrete anchors that secure the bottom of the posts to the footings? I will have so much room for post adjustments by not using any anchors and the code doesn’t talk about them. However, could a strong wind lift the deck up (or will the deck be just too heavy)?

My deck is a free standing deck (i.e., 20’ x 14’ platform over four 8” x 8” x 6’ posts) and will have cross bracing. The excavated holes for my deck footings are 32 inches deep (24” x 24” in area). I am going to have 2 inches of gravel in each hole and the code requires 10 inches of concrete. That would leave 20 inches from the top of the concrete footing to the ground level. I was going to place the deck post in ground on top of the footing and fill the remainder with dirt/gravel.

Thanks a lot for any help,
z_zk_z is offline   Reply With Quote
Sponsored Links
Old 06-28-2010, 07:00 PM   #2
Wire Chewer
Red Squirrel's Avatar
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 3,579
Rewards Points: 586

I don't think anchors are used where I live, but we do not get hurricanes and tornadoes either. If your area is prone to those I'd strongly suggest it otherwise you may be ok.

Though if you want to play it safe, I would at least anchor the posts that are at the perimeter.
Red Squirrel is offline   Reply With Quote
Sponsored Links
Old 06-28-2010, 07:25 PM   #3
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Rewards Points: 2,000

Where are you located ?

Yes, depending upon the deck a strong wind could lift it up

I also would not put the post in ground
What type of wood ?

Scuba_Dave is offline   Reply With Quote
Sponsored Links
Old 06-28-2010, 09:35 PM   #4
Civil Engineer
Join Date: Mar 2009
Location: Boston
Posts: 5,832
Rewards Points: 5,246

I am unclear why you want to float the piers over the concrete. By using Simpson post anchors or equivalent, you can adjust the posts up and down, although typically not laterally. With fixed post attachments, you generally adjust the vertical position of the posts using shims.

I am not sure what code requires, but it is always a good idea to anchor the posts to the foundation in order to prevent movement of the deck due to wind, earthquake, or vehicle impact. This can be done with J bolts or post anchors. If you are concerned about not lining the posts up correctly with the deck joists, put the posts in first, then attach the joists later.
Daniel Holzman is offline   Reply With Quote
Sponsored Links

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Deck Post Cracks judexromo Building & Construction 2 06-03-2010 06:41 AM
Deck Framing - Beams on top of footing (not enough space for post) Maatoy Building & Construction 18 06-02-2010 08:03 PM
mounting 4x4 wood post to concrete porch pshinaults Building & Construction 1 05-27-2010 02:53 PM
Concrete Deck Post removal cookie300 Building & Construction 3 07-07-2009 03:59 PM
Building deck over concrete patio stro77 Building & Construction 8 06-25-2009 04:21 PM

Top of Page | View New Posts