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Old 06-10-2013, 01:41 PM   #1
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Tips on Cutting Stringers?


Hi,
I finally have the cross section of our stairwell mapped out so I can precisely plan some stair stringers. Anyone out there have tips on cutting or installing before I go and screw up a few 2x12's?

I was thinking of testing the length and snugness on a 2x4 instead of burning a 2x12... any other suggestions?



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Old 06-10-2013, 02:21 PM   #2
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Tips on Cutting Stringers?


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Anyone out there have tips on LAYOUT or installing before I go and screw up a few 2x12's?
2x12?

Stringer Layout: LINK

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Old 06-10-2013, 02:31 PM   #3
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Tips on Cutting Stringers?


http://www.blocklayer.com/stairs/stairseng.aspx
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Old 06-10-2013, 02:34 PM   #4
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Tips on Cutting Stringers?


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2x12?
2x12 -- Are you suggesting use 2x10s instead? With 3-1/2" at the weakest point a 2x10 barely cuts it. 2x12 leaves 5" of solid material. It is only marginally more expensive and will be stronger.

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Stringer Layout: LINK
That's just a google search for stringer layout... I've looked at online pix a hundred times.
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Old 06-10-2013, 02:37 PM   #5
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Tips on Cutting Stringers?


If you just have to have notched-out stringers, make sure to finish your cuts with a vertical handsaw, and not to overcut with the power saw.
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Old 06-10-2013, 02:38 PM   #6
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Tips on Cutting Stringers?


A set of "these" are a must imo...I never cut stairs without them.

Also, only use the framing square to layout the first stringer, cut that stringer and then use it as a template to layout the rest.
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Last edited by kwikfishron; 06-10-2013 at 02:44 PM.
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Old 06-10-2013, 02:46 PM   #7
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Tips on Cutting Stringers?


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If you just have to have notched-out stringers, make sure to finish your cuts with a vertical handsaw, and not to overcut with the power saw.
Yeah, must be the notched out stringers... the tops of the stairs are open so a box frame we talked about wouldn't be applicable. Since you mention it tho, the stringers I took out were terrible -- thru cuts w circular saw. That left about an inch of overbite on every cut in both directions. I'll post pix of the old work later.

I'll get close w the circular and finish w the jig saw.
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Old 06-10-2013, 02:48 PM   #8
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Tips on Cutting Stringers?


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A set of "these" are a must imo...I never cut stairs without them.

Also, only use the framing square to layout the first stringer, cut that stringer and then use it as a template to layout the rest.
Thanks! I will pick those up... I was thinking a couple c-clamps to affix a straightedge to my L at the right angle... but those are so much nicer.
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Old 06-10-2013, 02:54 PM   #9
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Tips on Cutting Stringers?


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Thanks! I will pick those up... I was thinking a couple c-clamps to affix a straightedge to my L at the right angle... but those are so much nicer.
The only straightedge you need is a framing square which is what those nuts are meant to be used with.
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Old 06-10-2013, 03:14 PM   #10
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Tips on Cutting Stringers?


the straightedge and clamps method works just as good and it gives you a single edge to hold so your able to mark your line
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Old 06-10-2013, 06:56 PM   #11
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Tips on Cutting Stringers?


So with the "not shown" tread overhang of 1", does that mean your treads are 10-1/2"? Otherwise, may not pass code where you are.

This may help:
http://www.abqstair.com/wp-content/u...copy_1__1_.pdf
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Old 06-10-2013, 07:25 PM   #12
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Tips on Cutting Stringers?


When you do your calculations from finish floor to finish floor remember you have to remove the thickness of the tread from the bottom horizontal cut to compensate for adding the tread. Another thing I am in the habit of is as I make each cut I leave the entire line on at the tip to taking the entire line off where cuts meet. As the wood shrinks the tip shrinks fastest and most and the cuts become convex. I have seen stringers where the tip is almost 1/8" smaller because of shrinkage if it is a while before they are finished. The treads are then out of level unless you hold the riser up to compensate. Remember to have the crown up on all stringers when marking them.
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Old 06-10-2013, 07:31 PM   #13
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Tips on Cutting Stringers?


Actually, I think the drawing already has the treads shown.
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Old 06-11-2013, 07:00 AM   #14
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Tips on Cutting Stringers?


I wouldn't notch my stringer around that 2x4 block at the bottom. If the 2x4 is for nailing the riser, then I would cut it between the stringers. The stringer will be stronger if it bears directly on the subfloor. I would also double the joist that the stringer lands on.
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Old 06-11-2013, 08:02 AM   #15
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Tips on Cutting Stringers?


@Centerline... Great document -- Concise, clear... Yes it's a 1" overhang which makes the foot space on a tread 10.5" but it's still a 9.5" run. Would not work in new construction, but here we're confined by the existing structure so getting 10" is just not possible. Not without cutting into the landing (already only 3') or the hallway.

@Duckweather... So I understand you right, you're saying that if you cut your horizontals and verticals at 90 to each other, eventually the "tip" will shrink and the stairs will tend to lean down (and the risers - back)... so you deliberately cut each 90 to only 89 degrees or so? i.e. after barely tapering your cuts by the 1/32nd thickness of your line, the tread and riser forms about 89 degrees instead of 90, which will turn into 90 over time?

@Maintenance -- I was debating both ways... so ok, I'll just notch the center stringer then and the two outer stringers would have the block between them.

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