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

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 04-12-2011, 01:06 PM   #1
Newbie
 
Join Date: Apr 2011
Posts: 4
Rewards Points: 10
Default

Deck footers near house


Hi,

I'm building a free standing deck next to the house. Unfortunately this makes me end up with a row of footers close enough to the house to be in the basement backfill area. My house is 3 years old.

I'm looking for a sanity check... With my post hole digger, I can get down to 5 feet. It looks like the basement floor is 6 feet below grade. So I'm thinking for the holes near the house -- since this is considered disturbed soil -- I can dig down 5 feet, use a 4x4 to compact the bottom of the hole, bell out the bottom of the hole, put compacted gravel in the bottom, and then fill with concrete using a sono tube (not extending the tube into the bell).

Would that hold? I'm nervous about sinking because I'll be getting a roof installed on the deck, and the roof will attach to the house. I can't attach the deck to the house because it's cantilevered so nothing but air under the rim joist on the house.

Any thoughts?

Thanks!

drjohnson is offline   Reply With Quote
Old 04-12-2011, 01:24 PM   #2
Not so new
 
12penny's Avatar
 
Join Date: Nov 2008
Location: Lehigh Valley, Pa.
Posts: 934
Rewards Points: 504
Default

Deck footers near house


dr... not trying to be wise a##, but what did your building department say. Surely this is a project that requires a permit and they would be the people to ask.

That and you didnt fill out your profile. So we have no idea where you live.

12penny is offline   Reply With Quote
Old 04-12-2011, 02:09 PM   #3
Newbie
 
Join Date: Apr 2011
Posts: 4
Rewards Points: 10
Default

Deck footers near house


My building department doesn't seem concerned about it, but I'm just trying to be certain. Got the permit.
I'm in NJ. I have to be 36" down to be below frost -- I'm assuming that's why you ask about location.
drjohnson is offline   Reply With Quote
Old 04-12-2011, 02:15 PM   #4
Not so new
 
12penny's Avatar
 
Join Date: Nov 2008
Location: Lehigh Valley, Pa.
Posts: 934
Rewards Points: 504
Default

Deck footers near house


...correct.

Your plan seems well thought out and to me sounds doable. I think we need one of our resident engineers to answer your soil compaction question.

One should drop by soon.
12penny is offline   Reply With Quote
Old 04-12-2011, 03:40 PM   #5
Member
 
SteelToes's Avatar
 
Join Date: Oct 2010
Location: Chicago Illinois
Posts: 185
Rewards Points: 150
Default

Deck footers near house


How deep is that cantilever?

Last edited by SteelToes; 04-12-2011 at 04:11 PM. Reason: .
SteelToes is offline   Reply With Quote
Old 04-12-2011, 04:29 PM   #6
Newbie
 
Join Date: Apr 2011
Posts: 4
Rewards Points: 10
Default

Deck footers near house


The house is cantilevered 18" off the foundation. The deck cantilever towards the house will put the footers 30" from the foundation.
drjohnson is offline   Reply With Quote
Old 04-12-2011, 04:50 PM   #7
Member
 
SteelToes's Avatar
 
Join Date: Oct 2010
Location: Chicago Illinois
Posts: 185
Rewards Points: 150
Default

Deck footers near house


Quote:
Originally Posted by drjohnson View Post
The house is cantilevered 18" off the foundation. The deck cantilever towards the house will put the footers 30" from the foundation.
O.K
Now, how high is the deck of the ground going to be and how high is the house cantilever of the ground right now ?

Is it possible to run a deck joist to the foundation wall and attach to a ledger board?
In other words going under cantilever.
SteelToes is offline   Reply With Quote
Old 04-12-2011, 05:56 PM   #8
Concrete & Masonry
 
Join Date: Nov 2008
Location: Wisconsin
Posts: 2,788
Rewards Points: 2,128
Default

Deck footers near house


If you're already going down five feet, I'd suggest going the additional foot or 2 to get direct bearing on virgin soil. Odds are you won't hit non-disturbed soil for 12" or so below the top of the basement floor elevation. I know it's not fun or easy, but it's risky IMO to set these posts on back fill that's only a few years old.
jomama45 is online now   Reply With Quote
Old 04-12-2011, 06:05 PM   #9
Member
 
Join Date: Mar 2009
Posts: 114
Rewards Points: 75
Default

Deck footers near house


I've done work in townships that don't allow free standing decks for this reasons. I would still attach to the cantilever and go down to the virgin soil. If Its that easy to go to 5 ft manually you need to hit the virgin
dvatt is offline   Reply With Quote
Old 04-12-2011, 09:39 PM   #10
Registered User
 
Join Date: Mar 2009
Posts: 9,967
Rewards Points: 2,000
Default

Deck footers near house


So just cantilever the deck joists maximum Lj/4 to reach the house cantilever. House with 2' cant., deck with 4' cant. and 16' span between beams with 2x12's 16"oc,Doug.fir; http://www.lancova.com/deckinfo.pdf pp.4, fig.2, pp.3; joists.
Check locally for Code.

Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
Old 04-13-2011, 12:43 PM   #11
Newbie
 
Join Date: Apr 2011
Posts: 4
Rewards Points: 10
Default

Deck footers near house


Thanks everyone! Sounds like the best plan is keep on diggin' to virgin soil. And if I can't do that, work plan B based on the other suggestions. I appreciate the opinions!

drjohnson is offline   Reply With Quote
Reply

Tags
deck, footer, footings


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 Addition - Floating to Attached Foundation eemichael83 Project Showcase 15 08-22-2010 10:40 PM
Questions on a deck I just built. stearns86 Carpentry 50 10-12-2009 11:17 PM
Attic Fan AND Whole House Fan PapaGnome HVAC 6 02-15-2009 03:28 PM
The Bioswale, french drain, deck, drainage dilemma (long) seabright_sc Building & Construction 2 01-05-2008 04:37 PM
Deck footers not 100% level? ssgumby Building & Construction 1 05-11-2005 08:32 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.