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danthedewman1

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Hi..New guy here..I have an existing deck of my house and want to add steps down to the ground. Id like to have the stringers land on a concrete pad. Im just not sure how far out from the deck to have the concrete pad sit so the stringers will rest on the pad. The pad will be about 18"x 60", roughly,its just there to keep the stringers off the ground. The steps will be 48" wide, three stringers. The pad will be about 80 inches below the top of the deck..Thank You......

Nealtw

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That would give you 11 risers and 10 treads and if you cut 10" for a 11" treads

The nose of the last would be at or near 101" so the back of the stringer would be about 96" from the nose on the deck measured plumb down and level across. So an 18" pad would be from 96" to 114"

P C D

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80 inches divided by 8" per rise = 10 risers and 10 treads for typical stairs (top tread flush with deck supported by deck rim joist). If each tread is 10" deep, the first riser will be 100" away from the deck. Typically the pad supporting the stringers would also act as an off-the-ground landing. If that landing is 24" deep, that would put the front of the pad 124" away from the deck.

danthedewman1

Nealtw

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80 inches divided by 8" per rise = 10 risers and 10 treads for typical stairs (top tread flush with deck supported by deck rim joist). If each tread is 10" deep, the first riser will be 100" away from the deck. Typically the pad supporting the stringers would also act as an off-the-ground landing. If that landing is 24" deep, that would put the front of the pad 124" away from the deck.

8" is not code. and the deck is counted as a tread

danthedewman1

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Nealtw, where is an 8" riser not up to code? In Canada?

When you make your top tread flush with the top of the deck, you can support the stringers on the deck's rim joist. If you "count the deck as a tread," you need to add some sort of beam to support the top of the stringers.

Nealtw

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The Codes (2009 IRC):

• 311.7.1 – Stairways shall be a minimum of 36” wide
• 311.7.4.1 – Maximum Riser Height is 7 ¾” (max. height difference of 3/8” based on all risers)
• 311.7.4.2 – Minimum Tread Depth is 10” (max . width difference is 3/8” based on all treads)
• 311.7.4.3 – Stair tread nosing must extend out ¾” to a maximum of 1 ¼” past front of riser unless the tread is 11” or larger (just like above 3/8” max. discrepancy is allowed)
We do build our decks out of 2x10 with a 2x12 paint grade skirt which makes hanging stairs much easier. On long stringers we do add a paint grade 2x12 full width beside the stinger with gives us full contact against the rim like you like.

P C D

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Neal, thanks for the quote. In Oregon the IRC has been ammended to allow for 8" risers.

We must be taller and more agile than average :smile:

huesmann

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Is there a Lake Wobegon in Oregon?

Nealtw

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Neal, thanks for the quote. In Oregon the IRC has been ammended to allow for 8" risers.

We must be taller and more agile than average :smile:
So what would be the rule in

Missouri, the ozarks

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So what would be the rule in

Missouri, the ozarks

The required math I offered the OP would be the same, regardless of the variables "total rise" and "rise per step." I don't have as much free time as you do to do the homework for others.

Nealtw

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The required math I offered the OP would be the same, regardless of the variables "total rise" and "rise per step." I don't have as much free time as you do to do the homework for others.
Really, perhaps you should take the time to think about the info you are giving.

You suggested making the pad 24" and called it a landing.
The pad is either a step or a landing, a step wants to be very close to the depth of the tread anything bigger is a landing, but a landing is 36" so to have a landing his pad goes to 40 -42" from 18"

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