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jimmy21 11-30-2011 03:58 PM

cutting stair stringers
 
1 Attachment(s)
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

BigJim 11-30-2011 04:07 PM

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

titanoman 11-30-2011 05:04 PM

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).

paul100 11-30-2011 05:48 PM

Try this stair calculator
http://www.blocklayer.com/Stairs/StairsEng.aspx

jimmy21 11-30-2011 06:27 PM

Quote:

Originally Posted by jiju1943 (Post 782503)
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

woodworkbykirk 11-30-2011 06:53 PM

Quote:

Originally Posted by titanoman (Post 782551)
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

titanoman 11-30-2011 06:58 PM

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.

kwikfishron 11-30-2011 07:11 PM

You're only required to have a landing at the 12’ mark of rise here, regardless of the number of steps.

titanoman 11-30-2011 07:15 PM

Quote:

Originally Posted by kwikfishron (Post 782691)
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

Keith Mathewson 11-30-2011 07:28 PM

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?

titanoman 11-30-2011 08:13 PM

Quote:

Originally Posted by Keith Mathewson (Post 782704)
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.

jimmy21 11-30-2011 08:30 PM

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.

Keith Mathewson 11-30-2011 08:30 PM

Please tell me how a mid span post counteracts lateral forces?
And That's why there are building inspectors

titanoman 11-30-2011 08:33 PM

Quote:

Originally Posted by Keith Mathewson (Post 782763)
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.

woodworkbykirk 11-30-2011 08:36 PM

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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