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Old 11-30-2011, 03:58 PM   #1
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cutting stair stringers


Im trying to lay out some stair stringers and im pulling my hair out. The problem is that the stringers are right at the length where 20' will work, but i don't have room for waste


At first i was laying the stringers out so they would be flush with the existing 2x12 and then put plywood roofing an 3" of decking on, so its all flush on the first step. The problem is with cutting 3 1/2 off the top step, it barely leaves anything to attach to the 2 x 12. Now im thinking i should make the first step lower, so you step off the deck down onto the first step.
Can anyone help me lay this out?

The concrete pad is 170" to the edge of it, so i figure to the front of the step it should give be 185". It will be 129 1/4 to the top of the decking, although at the moment, just the roofing is on
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Old 11-30-2011, 04:07 PM   #2
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cutting stair stringers


You will have 17 risers divided into 129.25" the run will be 10 inches.

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Old 11-30-2011, 05:04 PM   #3
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cutting stair stringers


F.Y.I code says no one step can vary more than 3/8" from the others. Don't forget to allow the thickness of you tread material on the first tread cut (bottom).

Last edited by titanoman; 11-30-2011 at 05:06 PM.
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Old 11-30-2011, 05:48 PM   #4
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cutting stair stringers


Try this stair calculator
http://www.blocklayer.com/Stairs/StairsEng.aspx
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Old 11-30-2011, 06:27 PM   #5
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Originally Posted by jiju1943 View Post
You will have 17 risers divided into 129.25" the run will be 10 inches.

then my stairs would be in the dirt with the front of the first step touching the concrete.



I got it figured out though. Subtracted 8 1/2 (7 inch step plus 1 1/2 tread) from my original 129 1/4 calculation, to give me 120.75. divide that by 17 and i ended up with roughly 7 3/32. To give me the distance needed to get on to the concrete i went with 11 1/2 runs. This made the back of my stringers clear the concrete by 8 inches or so. Stuck them in place, and they look perfect. Glad it worked out, cuz i was sure pulling my hair out earlier. The real problem i was having was that i kept thinking my 20' 2x12's were too short
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Old 11-30-2011, 06:53 PM   #6
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F.Y.I code says no one step can vary more than 3/8" from the others. Don't forget to allow the thickness of you tread material on the first tread cut (bottom).

that must some wacky american code, in canada its no more than 1/8 variance between risers.. if you have to make it up you add or subtract 1/16 over 6 rises, cant do it all at once

also with a total rise of 129", you have to have a landing.. code requires a resting point as soon as a flight of stairs has 13 or more risers
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Old 11-30-2011, 06:58 PM   #7
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cutting stair stringers


Canada must have the wacky codes . Half the houses in America have a 9' basement which is 15 risers with no intermediate landing. Thats just silly.
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Old 11-30-2011, 07:11 PM   #8
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You're only required to have a landing at the 12’ mark of rise here, regardless of the number of steps.
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Old 11-30-2011, 07:15 PM   #9
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You're only required to have a landing at the 12 mark of rise here, regardless of the number of steps.
Now that sounds more like it.ki
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Old 11-30-2011, 07:28 PM   #10
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cutting stair stringers


There are a number of problems here-

The pad was poured before the stair was drawn out and so isn't in the right place.

A 20' stringer is too long for a single flight of stair, it will be bouncy and perhaps over stressed.

The sub-tread, roofing and 3 1/2" tread material? What's going on?

There should be a landing on this stair.

That'll do for now, do you have a jack hammer?
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Old 11-30-2011, 08:13 PM   #11
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Quote:
Originally Posted by Keith Mathewson View Post
There are a number of problems here-

The pad was poured before the stair was drawn out and so isn't in the right place.

A 20' stringer is too long for a single flight of stair, it will be bouncy and perhaps over stressed.

The sub-tread, roofing and 3 1/2" tread material? What's going on?

There should be a landing on this stair.

That'll do for now, do you have a jack hammer?
Well of course you can use a mid-span post if theres no wall to attach to (?).
The mid-span landing? No reason. And then they would really miss the concrete.
And I don't get the plywood or roofing either.

Last edited by titanoman; 11-30-2011 at 08:19 PM.
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Old 11-30-2011, 08:30 PM   #12
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cutting stair stringers


I'm not worried about supporting mid span, that's not. Problem. But having a landing required would suck. The concrete is plenty big enough so I have room to extend farther. It just couldn't be too short. The roofing is because this is a combination carport and deck. It has torch down roofing and then I'm putting 2x4 sleeepers down and then screwing the deck to the sleepers, to not puncture the roofing.


The only reason I'm building a deck/stairs is the building inspector said I need permanent stairs up to my storage trusses. He said I have too much headroom up there and it therefore requires permanent stairs. The original pull down stairs don't count.
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Old 11-30-2011, 08:30 PM   #13
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Please tell me how a mid span post counteracts lateral forces?
And That's why there are building inspectors
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Old 11-30-2011, 08:33 PM   #14
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Please tell me how a mid span post counteracts lateral forces
Not a lot if one of the stringers isn't anchored to a wall.
And it's totally legal in california,/everywhere.

Last edited by titanoman; 11-30-2011 at 08:35 PM.
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Old 11-30-2011, 08:36 PM   #15
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cutting stair stringers


any person walking up or down a flight of stairs will develop a memory in regards to how much to raise their foot to walk up the stair comfortably,, any more than 3/16" becomes very awkward and makes it more likely for the person to trip.. hence our code of max riser variance of 1/8"

what are you framing your stairs with to have more than 13 rises in a straight flight of stairs and not have issues with the stair sagging our bouncing? 2 ply lvl's

we have much stricter codes in a number of areas for different trades


one of the scariest ive heard is regarding your electrical,, cant remember teh exact distance but you can have as many outlets as you can fit within so many feet. here you cant have more that 12 outlets or light boxes per circuit. with out code electrical fires are far less likely to happen as

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