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Deck footing requirements
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Re: Deck footing requirements By  darren

Posts: 0

4/4/2001 12:17:00 PM

yes-- footings are required
1997 UBC section 1806.1
"footings and foundations shall be constructed of masonry, concrete, or treated wood in conformance with division II and shall extend below the frost line."
if the deck is >30" above grade then a permit is required, and subsequently a footing is then also required. 30" or less and no permit or footings are required.

darren


   

Re: Deck footing requirements By  tkr

Posts: 0

4/4/2001 12:49:00 PM

In my jurisdiction, all decks require an inspection.(and footers)
Simple answer is to call your local Building Inspection Division and ask them.


   

Re: Deck footing requirements By  impahster

Posts: 0

4/5/2001 8:25:00 AM

If you look at 1806.1, it does not state what structures or buldings shall have footings. If you go to 1806.3, you''ll notice that only bearing walls require foundations.
Where does it state that decks or similar structures require footings? [QUOTE]Originally posted by darren:
[b]yes-- footings are required
1997 UBC section 1806.1
"footings and foundations shall be constructed of masonry, concrete, or treated wood in conformance with division II and shall extend below the frost line."
if the deck is >30" above grade then a permit is required, and subsequently a footing is then also required. 30" or less and no permit or footings are required.

darren[/b][/QUOTE]


   

Re: Deck footing requirements By  maniac

Posts: 0

4/5/2001 8:57:00 AM

You could use a pile system but it''s still a footing system, and you should comply with sec 1807 UBC.


   

Re: Deck footing requirements By  Vandy

Posts: 0

4/5/2001 9:40:00 AM

In all of my experiences, footings requirements are based on load, not height. Code requires a handrail on decks above 30", but I''ve never heard of a footing requirement like that. Footings will definately support your deck the best, but I don''t believe they are required.


   

Re: Deck footing requirements By  darren

Posts: 0

4/5/2001 10:03:00 AM

[QUOTE]Originally posted by impahster:
[b]If you look at 1806.1, it does not state what structures or buldings shall have footings.
THE FACT THAT IT DOESN''T STATE WHAT STRUCTURES OR BUILDINGS MAKES IT APPLY TO ALL.

If you go to 1806.3, you''ll notice that only bearing walls require foundations.
Where does it state that decks or similar structures require footings? [/b][/QUOTE]

A DECK IS ESSENTIALLY A FLOOR. THE POSTS ARE ESSENTIALLY INDEPENDANT BEARING WALLS. BASED ON THAT, TABLE 18-1-C REQUIRES FOOTINGS.


   

Re: Deck footing requirements By  maniac

Posts: 0

4/5/2001 11:43:00 AM

Its a structure that needs a stable base. Without footings it''s not stable, over the long term. unstable=unsafe. Put in or require the footing.


   

Re: Deck footing requirements By  Ewenme

Posts: 0

4/5/2001 11:56:00 AM

One could argue that height does have some bearing on the question of footings: UBC does not require permits for platforms or walkways under 30" high; so, no permit probably equates to no footing. A deck under 30" high could be huge and still not have footings below frost depth... while the same size deck 32" high would require footings. I believe the footings for decks over a patio help stabilize the structure from lateral movement. At what point does it become necessary to do that? Is it 30"? Perhaps an engineer or architect could shed some light.

Carol


   

Re: Deck footing requirements By  maniac

Posts: 0

4/5/2001 12:01:00 PM

One has.
[QUOTE]Originally posted by Ewenme:
[b]One could argue that height does have some bearing on the question of footings: UBC does not require permits for platforms or walkways under 30" high; so, no permit probably equates to no footing. A deck under 30" high could be huge and still not have footings below frost depth... while the same size deck 32" high would require footings. I believe the footings for decks over a patio help stabilize the structure from lateral movement. At what point does it become necessary to do that? Is it 30"? Perhaps an engineer or architect could shed some light.

Carol[/b][/QUOTE]


   

Re: Deck footing requirements By  impahster

Posts: 0

4/5/2001 4:18:00 PM

If you look at table 18-1-C footnote #3 you will discover that only interior stud bearing walls may be supported by an isolated footing, which takes you back to section 1806.3, and a deck does not have bearing walls. Thanks for the feedback, I am enjoying your interesting interpretation of the code. [QUOTE]Originally posted by darren:
[b] A DECK IS ESSENTIALLY A FLOOR. THE POSTS ARE ESSENTIALLY INDEPENDANT BEARING WALLS. BASED ON THAT, TABLE 18-1-C REQUIRES FOOTINGS.

[/b][/QUOTE]


   

Re: Deck footing requirements By  maniac

Posts: 0

4/5/2001 4:47:00 PM

Even with piles they need to be interconnected per section 1807 UBC97. But....who would want to put this in w/out proper support? The only reason would be to protect the buyer of the property, when the idiot sells.


   

Re: Deck footing requirements By  Duty Calls

Posts: 0

4/6/2001 6:14:00 AM

Very interesting indeed!

Im with the others that require footings on deck posts. Without adequate support failure is sure to happen... it might take time, but it will happen.

I have a different twist to this.
You have 2 or 3 posts set into the ground.
You have a beam or equivalent material set across the posts for the joists to rest on.
When the joists bear on this beam they are doing just that... ''bearing '' on the beam.
If the question is whether the code applies is because of the text bearing ''walls'', then I would say yes. If there is a guard rail on this it would strength this thought for me... the electrical code requires floor receptacle outlets along bannisters and railings because they are considered ''wall'' space...

Okay, im done... I think I have thought about this wayyyyyy too much! LOL

Most Assuredly,
Duty Calls


   

Re: Deck footing requirements By  InspectorDude

Posts: 0

4/6/2001 7:14:00 AM

Maybe we''ve taken this WAY too seriously....If a manufactured home can be placed on a gravel pad, with treated wood "footers", and masonry pilasters, why couldn''t a deck (less than 30" above grade be placed on a similar base or even on skids? Home depot and others sell deck kits that use a 12"X12" congrete post base that rests on the surface of the ground, with either short posts or beams resting directly on the pier pads. This certainly does not meet the "below frost depth" requirement, but is common practice, and accepted in many, if not most, jurisdictions. Now if the deck is 15'' to 20'' above grade...that''s a whole different animal. We recently had a fatality due to a deck collapse, but it was much more than 12" above grade.

[This message has been edited by InspectorDude (edited 04-06-2001).]


   

Re: Deck footing requirements By  cman

Posts: 0

4/6/2001 9:16:00 AM

If I design 10 stories office building (not in seismic zone) and no bearing wall required. Can someone show me where in the UBC 97 said that I have to provide footings or foundations.


   

Re: Deck footing requirements By  keiki

Posts: 0

4/6/2001 11:02:00 AM

[QUOTE]Originally posted by cman:
[b]If I design 10 stories office building (not in seismic zone) and no bearing wall required. Can someone show me where in the UBC 97 said that I have to provide footings or foundations.[/b][/QUOTE]

Try Sections 1605.1, 1605.2, and Chapter 18. If you can prove that you don''t need foundations, then go ahead.


   

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