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Old 05-17-2013, 10:48 AM   #16
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took down a deck, i bet you can guess what i foud


per the 2009 International Residential Code (your local code may vary):

R403.1 General. All exterior walls shall be supported on continuous solid or fully grouted masonry or concrete footings, crushed stone footings, wood foundations, or other approved structural systems which shall be of sufficient design to accommodate all loads according to Section R301 and to transmit the resulting loads to the soil within the limitations as determined from the character of the soil. Footings shall be supported on undisturbed natural soils or engineered fill.

R403.1.4 Minimum depth.
All exterior footings shall be placed at least 12 inches (305 mm) below the undisturbed ground surface. Where applicable, the depth of footings shall also conform to Sections R403.1.4.1 through R403.1.4.2.

R403.1.4.1 Frost protection. Except where otherwise protected from frost, foundation walls, piers and other permanent supports of buildings and structures shall be protected from frost by one or more of the following methods: 1. Extended below the frost line specified in Table R301.2.(1); 2. Constructing in accordance with Section R403.3; 3. Constructing in accordance with ASCE 32; or 4. Erected on solid rock.

Exceptions:

1. Protection of freestanding accessory structures with an area of 600 square feet (56 m2) or less, of light-frame construction, with an eave height of 10 feet (3048 mm) or less shall not be required.
2. Protection of freestanding accessory structures with an area of 400 square feet (37 m2) or less, of other than light-frame construction, with an eave height of 10 feet (3048 mm) or less shall not be required.
3. Decks not supported by a dwelling need not be provided with footings that extend below the frost line.


the codes are not concerned about movement in decks that are not attached to the dwelling. this is the reason for providing as exception for footings that do not have to extend below the frost line.

with that said .... just because you can do something doesn't mean you should. movement of the ground from frost heave can cause a free standing non-attached deck to apply pressure to the outer wall of the dwelling causing damage.

when excavation occurs for a dwelling foundation ground around the foundation is typically disturbed. R403.1 requires that footings are supported on UNDISTURBED natural material or engineered fill. if it's been disturbed and was not provided with engineered backfill it cannot be used to support a footing.

just my humble thoughts ....

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Old 05-17-2013, 11:00 AM   #17
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took down a deck, i bet you can guess what i foud


thank you for the info. i appreciate it.

i have to do a fantastic job of fixing this rot so i can apply a nice sturdy ledger and attach my deck to the house. seems like floating is out of the options because i AM not excavating foots as low as the foundation footings.

now i need to figure out how many jack posts i need to support the weight of this corner of the house.
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Old 05-19-2013, 09:07 PM   #18
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took down a deck, i bet you can guess what i foud


Another question; I'm laying out the design and turns out to get an appropriate step from the deck to the door threshold; the 2x8 ledger would attach mainly to the two sill plates and 1.5" would overhang onto the concrete foundation. What should I do?
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Old 05-20-2013, 08:43 AM   #19
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took down a deck, i bet you can guess what i foud


Quote:
Originally Posted by langless28 View Post
Another question; I'm laying out the design and turns out to get an appropriate step from the deck to the door threshold; the 2x8 ledger would attach mainly to the two sill plates and 1.5" would overhang onto the concrete foundation. What should I do?

maybe raise it up 1.5 to 1" to get full ledger to mount to wood rim.
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Old 05-20-2013, 09:01 PM   #20
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took down a deck, i bet you can guess what i foud


Well I live in MA and need a large step so snow and leaves don't get in. Plus I would have to make all the steps that height as well. (Right now there is two steps to grade)

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