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#1
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Do I need a third stringer for my deck stairs?
I'm building a set of stairs on my deck and CANNOT seem to find a
straight answer on this. I'm using closed outside stringers spaced 36" and will use metal tread brackets to attach two 2x6 treads for each stair. Some info I've found says I DO need a third stringer in the middle for support...others have suggested I DO NOT need a third stringer as long as my span isnt longer than 36". Any suggestions on this? Will my 2x6s hold up ok or should I do the third stringer regardless to make my stairs stronger? |
#2
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Do I need a third stringer for my deck stairs?
On Aug 11, 2:57*am, wrote:
On Sun, 10 Aug 2008 21:56:06 -0700 (PDT), stratford1 wrote: I'm building a set of stairs on my deck and CANNOT seem to find a straight answer on this. I'm using closed outside stringers spaced 36" and will use metal tread brackets to attach two 2x6 treads for each stair. Some info I've found says I DO need a third stringer in the middle for support...others have suggested I DO NOT need a third stringer as long as my span isnt longer than 36". *Any suggestions on this? Will my 2x6s hold up ok or should I do the third stringer regardless to make my stairs stronger? My porch steps are almost 48" wide and I only have 2 stringers. However my steps are one solid 2x12, not two 2x6's. *Of course I only have 2 steps because the porch is only about 2 feet high. 36" is narrower, but you're using 2x6 which is much weaker. *I doubt they will break from normal use, but if your friends are 300lbs (or more), or you intend to move appliances on them, I'd add the middle stringer. *Or just add one anyhow because you'll have stronger steps. The cost is not that much more unless your steps are going up 15 feet or so. A 2X6 maximum span is 24" , so you definately need a 3rd stringer. I have 3 stringers on my deck stairs and the treads are 5 feet wide. |
#3
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Do I need a third stringer for my deck stairs?
On Sun, 10 Aug 2008 21:56:06 -0700, stratford1 wrote:
I'm building a set of stairs on my deck and CANNOT seem to find a straight answer on this. I'm using closed outside stringers spaced 36" and will use metal tread brackets to attach two 2x6 treads for each stair. Some info I've found says I DO need a third stringer in the middle for support...others have suggested I DO NOT need a third stringer as long as my span isnt longer than 36". Any suggestions on this? Will my 2x6s hold up ok or should I do the third stringer regardless to make my stairs stronger? Did you ask you local building inspector's office if they have any spacing requirements for stair stingers? Phil |
#4
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Do I need a third stringer for my deck stairs?
Mikepier wrote:
On Aug 11, 2:57 am, wrote: On Sun, 10 Aug 2008 21:56:06 -0700 (PDT), stratford1 wrote: I'm building a set of stairs on my deck and CANNOT seem to find a straight answer on this. I'm using closed outside stringers spaced 36" and will use metal tread brackets to attach two 2x6 treads for each stair. Some info I've found says I DO need a third stringer in the middle for support...others have suggested I DO NOT need a third stringer as long as my span isnt longer than 36". Any suggestions on this? Will my 2x6s hold up ok or should I do the third stringer regardless to make my stairs stronger? My porch steps are almost 48" wide and I only have 2 stringers. However my steps are one solid 2x12, not two 2x6's. Of course I only have 2 steps because the porch is only about 2 feet high. 36" is narrower, but you're using 2x6 which is much weaker. I doubt they will break from normal use, but if your friends are 300lbs (or more), or you intend to move appliances on them, I'd add the middle stringer. Or just add one anyhow because you'll have stronger steps. The cost is not that much more unless your steps are going up 15 feet or so. A 2X6 maximum span is 24" , so you definately need a 3rd stringer. I have 3 stringers on my deck stairs and the treads are 5 feet wide. My 2 deck steps are about 4' wide using 2 - 2x6s for each step with the stringer supports about 3' apart (6" overhang on each side). I've never noticed a problem in their 20 years of existence. If I bounce my 200 pounds in the middle of the step, I can feel a little .... a very little, give. I never even gave it a thought until I read this email. |
#5
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Do I need a third stringer for my deck stairs?
stratford1 wrote:
I'm building a set of stairs on my deck and CANNOT seem to find a straight answer on this. I'm using closed outside stringers spaced 36" and will use metal tread brackets to attach two 2x6 treads for each stair. Some info I've found says I DO need a third stringer in the middle for support...others have suggested I DO NOT need a third stringer as long as my span isnt longer than 36". Any suggestions on this? Will my 2x6s hold up ok or should I do the third stringer regardless to make my stairs stronger? If you were using 2x12 Douglas fir or yellow pine for treads I might say OK--- But using 2x6's, likely 'white wood' from the borg, you're nuts if you don't protect yourself from a personal injury or a lawsuit by adding a stringer. Jim |
#6
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Do I need a third stringer for my deck stairs?
On Aug 11, 8:40 am, Phil Again wrote:
On Sun, 10 Aug 2008 21:56:06 -0700, stratford1 wrote: I'm building a set of stairs on my deck and CANNOT seem to find a straight answer on this. I'm using closed outside stringers spaced 36" and will use metal tread brackets to attach two 2x6 treads for each stair. Some info I've found says I DO need a third stringer in the middle for support...others have suggested I DO NOT need a third stringer as long as my span isnt longer than 36". Any suggestions on this? Will my 2x6s hold up ok or should I do the third stringer regardless to make my stairs stronger? Did you ask you local building inspector's office if they have any spacing requirements for stair stingers? Phil A few years ago I was building a deck with steps very much like the OP's, except using 2-by cedar and with wooden cleats under the ends of the steps. Doing it to code, permits, inspectors, the works. Local code very specifically said 3' of 2x material was ok with no stringer. When I took the permit app in I deal with a couple of older guys who seemed to know what they were doing; one of them drew a line down the middle of the steps and said, "you need a stringer there". I said code didn't say so, and he said, "yeah, but it'll bounce, put in a stringer." So I did. Lot more work, since the steps were faced onto the two side stringers I hadn't done any of the design work on cutting risers and steps out of a stringer (it was a non-stock rise/run), and had to get a cedar 2x12. But it made a nice job. Bottom line: if you're wondering about, put it in. Bouncy steps will leave a shoddy impression in people's mind, even if the rest of the job is top-notch, and designing a stringer for a custom stair is an interesting and satisfying exercise. Chip C Toronto |
#7
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Do I need a third stringer for my deck stairs?
stratford1 wrote:
I'm building a set of stairs on my deck and CANNOT seem to find a straight answer on this. I'm using closed outside stringers spaced 36" and will use metal tread brackets to attach two 2x6 treads for each stair. Some info I've found says I DO need a third stringer in the middle for support...others have suggested I DO NOT need a third stringer as long as my span isnt longer than 36". Any suggestions on this? Will my 2x6s hold up ok or should I do the third stringer regardless to make my stairs stronger? My rule of thumb is that I don't leave a 2x6 unsupported less than 2' OC. If it were me, I would put in the middle stringer and be happy with the stiffer stairs. If you want to eliminate the middle stringer, then go with 2x12 treads. Try this; take a couple of 2x4s and lay them down on some flat concrete spaced 36" apart, outside to outside. Lay a 2x6 across them cut at 36". Now step on the middle of the 2x6 and see if you feel good about the flex. If you do, then go and get about 50 lbs of groceries in your arms and step on it again. If you still like it, ask your wife to step on it with you. If you still like it, then go for the unsupported span. If you don't, add the middle stringer. -- Robert Allison Rimshot, Inc. Georgetown, TX |
#8
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Do I need a third stringer for my deck stairs?
On Sun, 10 Aug 2008 21:56:06 -0700 (PDT), stratford1
wrote: I'm building a set of stairs on my deck and CANNOT seem to find a straight answer on this. I'm using closed outside stringers spaced 36" and will use metal tread brackets to attach two 2x6 treads for each stair. Some info I've found says I DO need a third stringer in the middle for support...others have suggested I DO NOT need a third stringer as long as my span isnt longer than 36". Any suggestions on this? Will my 2x6s hold up ok or should I do the third stringer regardless to make my stairs stronger? Sounds wide, I'd use a middle stringer. |
#9
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Do I need a third stringer for my deck stairs?
On Aug 10, 9:56*pm, stratford1 wrote:
I'm building a set of stairs on my deck and CANNOT seem to find a straight answer on this. I'm using closed outside stringers spaced 36" and will use metal tread brackets to attach two 2x6 treads for each stair. Some info I've found says I DO need a third stringer in the middle for support...others have suggested I DO NOT need a third stringer as long as my span isnt longer than 36". *Any suggestions on this? Will my 2x6s hold up ok or should I do the third stringer regardless to make my stairs stronger? So why are you debating using one? The cost of adding a third stringer is minimal and you already know in your mind that without it, it will be 'springy'. Add the third stringer. It won't need any fancy cleats, etc, just cut to fit under the treads. Harry K |
#10
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Do I need a third stringer for my deck stairs?
On Aug 11, 9:52 am, Harry K wrote:
On Aug 10, 9:56 pm, stratford1 wrote: I'm building a set of stairs on my deck and CANNOT seem to find a straight answer on this. I'm using closed outside stringers spaced 36" and will use metal tread brackets to attach two 2x6 treads for each stair. Some info I've found says I DO need a third stringer in the middle for support...others have suggested I DO NOT need a third stringer as long as my span isnt longer than 36". Any suggestions on this? Will my 2x6s hold up ok or should I do the third stringer regardless to make my stairs stronger? So why are you debating using one? The cost of adding a third stringer is minimal and you already know in your mind that without it, it will be 'springy'. Add the third stringer. It won't need any fancy cleats, etc, just cut to fit under the treads. Harry K Thanks for all the input! Yes, some of you are asking the right question...why am I set against not doing the third stringer, since its minimal cost and work to add it and will make it more safe? Well, originally I wasnt crazy about the asthetics of having the third stringer visible between my steps, since they will be spanning from closed stringers on the ends and will not have a riser board attached, but its not the end of the world. An injury on my deck would be MUCH worse. Anyway, thanks for all the help! |
#11
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Do I need a third stringer for my deck stairs?
On Aug 11, 3:44*pm, stratford1 wrote:
On Aug 11, 9:52 am, Harry K wrote: On Aug 10, 9:56 pm, stratford1 wrote: I'm building a set of stairs on my deck and CANNOT seem to find a straight answer on this. I'm using closed outside stringers spaced 36" and will use metal tread brackets to attach two 2x6 treads for each stair. Some info I've found says I DO need a third stringer in the middle for support...others have suggested I DO NOT need a third stringer as long as my span isnt longer than 36". *Any suggestions on this? Will my 2x6s hold up ok or should I do the third stringer regardless to make my stairs stronger? So why are you debating using one? *The cost of adding a third stringer is minimal and you already know in your mind that without it, it will be 'springy'. Add the third stringer. *It won't need any fancy cleats, etc, just cut to fit under the treads. Harry K Thanks for all the input! Yes, some of you are asking the right question...why am I set against not doing the third stringer, since its minimal cost and work to add it and will make it more safe? Well, originally I wasnt crazy about the asthetics of having the third stringer visible between my steps, since they will be spanning from closed stringers on the ends and will not have a riser board attached, but its not the end of the world. An injury on my deck would be MUCH worse. Anyway, thanks for all the help!- Hide quoted text - - Show quoted text - I struggle with this issue from an engineering perspective and I'm hoping another engineer can set me straight. Deflection of a simply supported beam with a concentrated load is: y= (F L^3) /(48EI) Using an L/480 stiffness criteria gives an allowable deflection of 36"/ 480 = 0.075" A standard 2x6 has an I = 24.1 in^4 and E = 1.6 e6 psi Therefore the allowable force on a SINGLE 2x6 would be: 2975 lbs ! That's a 10X safety factor for a 300 lb man ! Spread the load over two boards and the allowable load would double. Given these calculations, why would a third stringer be even remotely necessary? |
#12
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Do I need a third stringer for my deck stairs?
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#13
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Do I need a third stringer for my deck stairs?
wrote in message ... On Aug 11, 3:44 pm, stratford1 wrote: On Aug 11, 9:52 am, Harry K wrote: On Aug 10, 9:56 pm, stratford1 wrote: I'm building a set of stairs on my deck and CANNOT seem to find a straight answer on this. I'm using closed outside stringers spaced 36" and will use metal tread brackets to attach two 2x6 treads for each stair. Some info I've found says I DO need a third stringer in the middle for support...others have suggested I DO NOT need a third stringer as long as my span isnt longer than 36". Any suggestions on this? Will my 2x6s hold up ok or should I do the third stringer regardless to make my stairs stronger? So why are you debating using one? The cost of adding a third stringer is minimal and you already know in your mind that without it, it will be 'springy'. Add the third stringer. It won't need any fancy cleats, etc, just cut to fit under the treads. Harry K Thanks for all the input! Yes, some of you are asking the right question...why am I set against not doing the third stringer, since its minimal cost and work to add it and will make it more safe? Well, originally I wasnt crazy about the asthetics of having the third stringer visible between my steps, since they will be spanning from closed stringers on the ends and will not have a riser board attached, but its not the end of the world. An injury on my deck would be MUCH worse. Anyway, thanks for all the help!- Hide quoted text - - Show quoted text - I struggle with this issue from an engineering perspective and I'm hoping another engineer can set me straight. Deflection of a simply supported beam with a concentrated load is: y= (F L^3) /(48EI) Using an L/480 stiffness criteria gives an allowable deflection of 36"/ 480 = 0.075" A standard 2x6 has an I = 24.1 in^4 and E = 1.6 e6 psi Therefore the allowable force on a SINGLE 2x6 would be: 2975 lbs ! That's a 10X safety factor for a 300 lb man ! Spread the load over two boards and the allowable load would double. Given these calculations, why would a third stringer be even remotely necessary? Well, for one thing, you're using the wrong axis for the moment of inertia... |
#14
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Do I need a third stringer for my deck stairs?
On Aug 29, 11:24*pm, "Rick" wrote:
wrote in message ... On Aug 11, 3:44 pm, stratford1 wrote: On Aug 11, 9:52 am, Harry K wrote: On Aug 10, 9:56 pm, stratford1 wrote: I'm building a set of stairs on my deck and CANNOT seem to find a straight answer on this. I'm using closed outside stringers spaced 36" and will use metal tread brackets to attach two 2x6 treads for each stair. Some info I've found says I DO need a third stringer in the middle for support...others have suggested I DO NOT need a third stringer as long as my span isnt longer than 36". Any suggestions on this? Will my 2x6s hold up ok or should I do the third stringer regardless to make my stairs stronger? So why are you debating using one? The cost of adding a third stringer is minimal and you already know in your mind that without it, it will be 'springy'. Add the third stringer. It won't need any fancy cleats, etc, just cut to fit under the treads. Harry K Thanks for all the input! Yes, some of you are asking the right question...why am I set against not doing the third stringer, since its minimal cost and work to add it and will make it more safe? Well, originally I wasnt crazy about the asthetics of having the third stringer visible between my steps, since they will be spanning from closed stringers on the ends and will not have a riser board attached, but its not the end of the world. An injury on my deck would be MUCH worse. Anyway, thanks for all the help!- Hide quoted text - - Show quoted text - I struggle with this issue from an engineering perspective and I'm hoping another engineer can set me straight. Deflection of a simply supported beam with a concentrated load is: *y= (F L^3) /(48EI) Using an L/480 stiffness criteria gives an allowable deflection of 36"/ 480 = 0.075" A standard 2x6 has an I = 24.1 in^4 *and E = 1.6 e6 psi Therefore the allowable force on a SINGLE 2x6 would be: *2975 lbs ! That's a 10X safety factor for a 300 lb man ! Spread the load over two boards and the allowable load would double. Given these calculations, why would a third stringer be even remotely necessary? Well, for one thing, you're using the wrong axis for the moment of inertia...- Hide quoted text - - Show quoted text - You are absolutely correct. I had looked it up in a table, which didn't specify the axis. Since I wasn't sure of the axis I did actually check it with bh^3, which coincidentally gives 24.1 in^4, which caused me to stop right there, forgetting of course that the actual formula is bh^3/12 !!! So correcting my original post, the allowable load on a single 2x6 spanning 36" would be 247 lbs which might be a little close for comfort. Thanks for the help. |
#15
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Do I need a third stringer for my deck stairs?
wrote in message ... On Aug 29, 11:24 pm, "Rick" wrote: wrote in message ... On Aug 11, 3:44 pm, stratford1 wrote: On Aug 11, 9:52 am, Harry K wrote: On Aug 10, 9:56 pm, stratford1 wrote: I'm building a set of stairs on my deck and CANNOT seem to find a straight answer on this. I'm using closed outside stringers spaced 36" and will use metal tread brackets to attach two 2x6 treads for each stair. Some info I've found says I DO need a third stringer in the middle for support...others have suggested I DO NOT need a third stringer as long as my span isnt longer than 36". Any suggestions on this? Will my 2x6s hold up ok or should I do the third stringer regardless to make my stairs stronger? So why are you debating using one? The cost of adding a third stringer is minimal and you already know in your mind that without it, it will be 'springy'. Add the third stringer. It won't need any fancy cleats, etc, just cut to fit under the treads. Harry K Thanks for all the input! Yes, some of you are asking the right question...why am I set against not doing the third stringer, since its minimal cost and work to add it and will make it more safe? Well, originally I wasnt crazy about the asthetics of having the third stringer visible between my steps, since they will be spanning from closed stringers on the ends and will not have a riser board attached, but its not the end of the world. An injury on my deck would be MUCH worse. Anyway, thanks for all the help!- Hide quoted text - - Show quoted text - I struggle with this issue from an engineering perspective and I'm hoping another engineer can set me straight. Deflection of a simply supported beam with a concentrated load is: y= (F L^3) /(48EI) Using an L/480 stiffness criteria gives an allowable deflection of 36"/ 480 = 0.075" A standard 2x6 has an I = 24.1 in^4 and E = 1.6 e6 psi Therefore the allowable force on a SINGLE 2x6 would be: 2975 lbs ! That's a 10X safety factor for a 300 lb man ! Spread the load over two boards and the allowable load would double. Given these calculations, why would a third stringer be even remotely necessary? Well, for one thing, you're using the wrong axis for the moment of inertia...- Hide quoted text - - Show quoted text - You are absolutely correct. I had looked it up in a table, which didn't specify the axis. Since I wasn't sure of the axis I did actually check it with bh^3, which coincidentally gives 24.1 in^4, which caused me to stop right there, forgetting of course that the actual formula is bh^3/12 !!! So correcting my original post, the allowable load on a single 2x6 spanning 36" would be 247 lbs which might be a little close for comfort. Thanks for the help. ***What dimensions are you using for a 2X6? |
#17
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Do I need a third stringer for my deck stairs?
replying to SteveBell, Scott J. wrote:
If you have enough nose hanging out over the steps you could add 1 X 8 riser boards on the vertical face of the stairs. This will cut way down on the springiness on the outer part of the step. A lot easier than adding a stringer. I'm an Engineer but I'm also practical and lazy. -- for full context, visit https://www.homeownershub.com/mainte...rs-324459-.htm |
#18
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Do I need a third stringer for my deck stairs?
On Thursday, January 26, 2017 at 2:14:05 PM UTC-6, Scott J. wrote:
replying to SteveBell, Scott J. wrote: If you have enough nose hanging out over the steps you could add 1 X 8 riser boards on the vertical face of the stairs. This will cut way down on the springiness on the outer part of the step. A lot easier than adding a stringer. I'm an Engineer but I'm also practical and lazy. -- Oh man, you're too late. 7 years ago, SteveBell was trampled and eaten by a herd of rabid gerbils. It was a real tragedy. He is survived by a wife, 4 ex-wives, 23 children, a flock of geese, 6 dogs, 18 cats, 3 monkeys, 2 elephants and 326 gerbils. The gerbils really miss him. ヽ(€¢€¿€¢)ノ [8~{} Uncle Sad Monster |
#19
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Do I need a third stringer for my deck stairs?
replying to Mikepier, Brad wrote:
so you should have 4 stringers... -- for full context, visit https://www.homeownershub.com/mainte...rs-324459-.htm |
#20
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Do I need a third stringer for my deck stairs?
On Monday, July 31, 2017 at 2:44:07 PM UTC-5, Brad wrote:
replying to Mikepier, Brad wrote: so you should have 4 stringers... for full context, visit https://www.homeownershub.com/mainte...rs-324459-.htm HomeMoaners strikes again!! Brad, I have some sad news for you. You're NINE YEARS too late with your 'helpful' post. |
#21
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Do I need a third stringer for my deck stairs?
Nuts? Its pretty common to spread 2x6s on a 36 inch span on stair treads
-- For full context, visit https://www.homeownershub.com/mainte...rs-324459-.htm |
#22
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Do I need a third stringer for my deck stairs?
Gman wrote
Nuts? Its pretty common to spread 2x6s on a 36 inch span on stair treads Its unlikely that he hasnt worked it out in 12 years. -- For full context, visit https://www.homeownershub.com/mainte...rs-324459-.htm |
#23
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More Heavy Trolling by the Senile Octogenarian Nym-Shifting Ozzie Cretin!
On Tue, 27 Apr 2021 03:47:24 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again: Nuts? Its pretty common to spread 2x6s on a 36 inch span on stair treads Its unlikely that he hasn¢t worked it out in 12 years. But it's VERY likely that YOU will answer every single such post, you abnormal trolling senile CRETIN! -- Richard addressing senile Rodent Speed: "**** you're thick/pathetic excuse for a troll." MID: |
#24
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Do I need a third stringer for my deck stairs?
On 4/26/2021 8:01 PM, cshenk wrote:
Rod Speed wrote: Gman wrote Nuts? Its pretty common to spread 2x6s on a 36 inch span on stair treads Its unlikely that he hasnt worked it out in 12 years. -- For full context, visit https://www.homeownershub.com/mainte...rs-324459-.htm And a center stringer is advised for long term durability but really depends on the load value. Yes, I'd use either a third stringer, use 2 x 8s, or don't invite fat people over. |
#25
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Do I need a third stringer for my deck stairs?
In alt.home.repair, on Mon, 26 Apr 2021 13:01:16 +0000, Gman
wrote: Nuts? Its pretty common to spread 2x6s on a 36 inch span on stair treads I don't think a third stringer is worth it. I played 3rd string for the Otumwa Mudhens and I didn't help the team at all. |
#26
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Do I need a third stringer for my deck stairs?
Ed Pawlowski wrote:
On 4/26/2021 8:01 PM, cshenk wrote: Rod Speed wrote: Gman wrote Nuts? Its pretty common to spread 2x6s on a 36 inch span on stair treads Its unlikely that he hasnt worked it out in 12 years. -- For full context, visit https://www.homeownershub.com/mainte...rs-324459-.htm And a center stringer is advised for long term durability but really depends on the load value. Yes, I'd use either a third stringer, use 2 x 8s, or don't invite fat people over. Smile! I was thinking also of an outdoor wheelchair ramp the local neighborhood built for a friend of mine. I was sort of 'project manager' I guess. We did it all with donations so no go-fund-me used. It took us months but we managed to make it so at all times, she could use it. It's 46inches wide on the ramp but the rails make the inner part 40 inches. Even though a 'ramp' it still uses a support like a stringer. We had a center one and 7 4x4 posts to support the central stringer. Workers replacing hot water heaters and other heavy stuff can use it safely. Electric wheelchairs will not be a problem. She's not heavy but her electric wheelchair is. Guessing combined may be 300lbs? |
#27
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Do I need a third stringer for my deck stairs?
On Monday, August 11, 2008 at 8:40:50 AM UTC-4, Phil Again wrote:
On Sun, 10 Aug 2008 21:56:06 -0700, stratford1 wrote: I'm building a set of stairs on my deck and CANNOT seem to find a straight answer on this. I'm using closed outside stringers spaced 36" and will use metal tread brackets to attach two 2x6 treads for each stair. Some info I've found says I DO need a third stringer in the middle for support...others have suggested I DO NOT need a third stringer as long as my span isnt longer than 36". Any suggestions on this? Will my 2x6s hold up ok or should I do the third stringer regardless to make my stairs stronger? Did you ask you local building inspector's office if they have any spacing requirements for stair stingers? Easier than that, just go by the address of remodeling construction companies and just ask them. They won't charge you just to tell you. |
#28
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Do I need a third stringer for my deck stairs?
On Mon, 26 Apr 2021 19:01:30 -0500, cshenk posted for all of us to digest... Rod Speed wrote: Gman wrote Nuts? Its pretty common to spread 2x6s on a 36 inch span on stair treads Its unlikely that he hasn?t worked it out in 12 years. -- For full context, visit https://www.homeownershub.com/mainte...rs-324459-.htm And a center stringer is advised for long term durability but really depends on the load value. Is that you Charlie Shenk? Where have you been hiding? Glad you're back. -- Tekkie |
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