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Re: How to make stair tread wider
[Re: blade]
#546531
03/03/13 09:01 PM
03/03/13 09:01 PM
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Joined: Jul 2011
Posts: 39,472
Marshall County
FurFlyin
Freak of Nature
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Freak of Nature
Joined: Jul 2011
Posts: 39,472
Marshall County
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When you add the 2 by to the riser you lengthen the tread above, but shorten the one below and so on. No gain in tread width. To lengthen the treads you have to lengthen the overall length of the run. So if you have 12 treads and want them 2" wider, your stair has to become 24" longer. No way around it. Also to be a comfortable stair the risers should be from 6" to 8" and the treads 9-11". The sum of two risers and one tread should be between 24 and 25". I.e. for a common 7/11 stair, the sum of two risers and one tread is 25" (7+7+11=25). The risers and treads should be exactly the same step to step. If you are off more than about 3/16" you will notice in your stride up and down. You're right.
If my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then will I hear from heaven and will forgive their sin and will heal their land. 2 Chronicles 7:14
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Re: How to make stair tread wider
[Re: blade]
#546566
03/03/13 09:42 PM
03/03/13 09:42 PM
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Joined: Dec 2010
Posts: 16,755
lat 34.09 long -86.13
metalmuncher
Old Mossy Horns
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Old Mossy Horns
Joined: Dec 2010
Posts: 16,755
lat 34.09 long -86.13
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When you add the 2 by to the riser you lengthen the tread above, but shorten the one below and so on. No gain in tread width. To lengthen the treads you have to lengthen the overall length of the run. So if you have 12 treads and want them 2" wider, your stair has to become 24" longer. No way around it. Also to be a comfortable stair the risers should be from 6" to 8" and the treads 9-11". The sum of two risers and one tread should be between 24 and 25". I.e. for a common 7/11 stair, the sum of two risers and one tread is 25" (7+7+11=25). The risers and treads should be exactly the same step to step. If you are off more than about 3/16" you will notice in your stride up and down. First and only sensible answer on here. Well, maybe one or two others.
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Re: How to make stair tread wider
[Re: FurFlyin]
#546864
03/04/13 10:04 AM
03/04/13 10:04 AM
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Joined: Jul 2011
Posts: 34,919
Boxes Cove
2Dogs
Freak of Nature
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Freak of Nature
Joined: Jul 2011
Posts: 34,919
Boxes Cove
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When you add the 2 by to the riser you lengthen the tread above, but shorten the one below and so on. No gain in tread width. To lengthen the treads you have to lengthen the overall length of the run. So if you have 12 treads and want them 2" wider, your stair has to become 24" longer. No way around it. Also to be a comfortable stair the risers should be from 6" to 8" and the treads 9-11". The sum of two risers and one tread should be between 24 and 25". I.e. for a common 7/11 stair, the sum of two risers and one tread is 25" (7+7+11=25). The risers and treads should be exactly the same step to step. If you are off more than about 3/16" you will notice in your stride up and down. You're right. Yes he is, basically what I said 'cept he's got the numbers. 7/11 is pretty standard in a house. Ya can't add to the riser , you won't change a thing.
"Why do you ask"?
Always vote the slowest path to socialism.
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Re: How to make stair tread wider
[Re: Megatrondiablo]
#546868
03/04/13 10:06 AM
03/04/13 10:06 AM
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Joined: Dec 2001
Posts: 15,142
Fairhope
bamachem
Old Mossy Horns
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Old Mossy Horns
Joined: Dec 2001
Posts: 15,142
Fairhope
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Short answer: You don't want to do that. If you want larger treads, then you have to rebuild the stairs to do it right. Here's what it looks like if you try to "add" treads on top. 
MOLON LABE
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Re: How to make stair tread wider
[Re: Megatrondiablo]
#546912
03/04/13 10:48 AM
03/04/13 10:48 AM
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Joined: Jul 2005
Posts: 19,131
Chelsea, AL
straycat
Old Mossy Horns
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Old Mossy Horns
Joined: Jul 2005
Posts: 19,131
Chelsea, AL
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You can do it, but it is a tripping hazard and would not be not code compliant.
If you remove the old tread completely, put in a "ledger" board 2x2 or 2x4(which will hold the extended new tread) which does not extend the entire vertical rise, then install a new wider tread....then that has an impact on "walkability" and safety which are the reasons for the code in the first place. In essence you would create an unnatural lip overhang of 1.5 inches plus the nosing of the tread itself, if any.
In the code the treads are measured from the nosing projection so in theory your treads would actually be the same size as they were before. Plus nosing projections are limited to a max of 1.25 inches by the code. IRC R311.5.3 Plus from a function standpoint any standard tread dimension nosing overhang greater than 1.25 would eventually warp or crack due to its cantilever condition if not supported underneath. Over time this puts to much load on that unsupported lip.
The only real way to fix it is to rip out and put in new runners that are cut to fit your wants.
"The grass withers, the flower fades, But the word of our God stands forever." Isaiah 40:8
"Neither the wisest constitution nor the wisest laws will secure the liberty and happiness of a people whose manners are universally corrupt.� Samuel Adams
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