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Osb Vs Plywood In Shearwalls

 
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Old 12-23-2018, 09:09 PM   #61
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Re: Osb Vs Plywood In Shearwalls


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Originally Posted by Dirtywhiteboy View Post
I have never lived or worked in a one hundred year old house.
Man they must smell musty
I didn't know the plumbing and wires lasted that long
i work on many .they breath .what isn't sealed well rots and gets replaced .it is life . we change general for good reasons .used to be real wood cabinets did not have plywood .now i have heard people call plywood -real wood . we learned to use and like it .we will adjust to osb
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Old 12-23-2018, 09:41 PM   #62
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Re: Osb Vs Plywood In Shearwalls


I live in a house built ~1890s, so at least ~120 years old, only musty when i get home,
Built with indoor bathroom, IN the basement(no freezing) had an acetylene gas generator (next door in case it exploded) for lighting before they switched to central electric powered lighting.

Originally pot stoves, then coal gravity heater with thermal mass poured over iron casting body, then Natural gas forced air...Now a 2005 92% LENNOX.

Some hub and post wiring still in use in wall cavities....

I'll adjust to OSB on temporary buildings only for me. Do as You will on your stuff

bare minimum footings, smallest lot that's legal, smallest windows to meet code, shortest wall, smallest rooms to code, smallest bathrooms, cheapest fixtures, lighting, cheap trim, cheap doors, cheap cabinets, = cheap homes....

If I mopped a wood finished kitchen floor every day, would the OSB survive the daily dampness? in the family bathroom with 4 or 5 children in and out.....

If I going to pedal my [email protected]# for money, I am working on the 2000 $ a night side of the street, I can always drop down to the 20$ ho land stroll.
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Old 12-23-2018, 09:43 PM   #63
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Re: Osb Vs Plywood In Shearwalls


One thing I found out: Get OSB wet for any length of time, and the carpenter ants love it.

Had a spendy warranty repair on a new build because of it.
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Old 12-23-2018, 10:01 PM   #64
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Re: Osb Vs Plywood In Shearwalls


If you have water issues big enough to need to replace the OSB you're tearing out chit anyways. In fact, if it was that much water I'm replacing plywood as well. Matters none which one it is.


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Old 12-23-2018, 11:15 PM   #65
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Re: Osb Vs Plywood In Shearwalls


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If you have water issues big enough to need to replace the OSB you're tearing out chit anyways. In fact, if it was that much water I'm replacing plywood as well. Matters none which one it is.


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well that's a good point .once ply wood molds ,once a cat pees on it .well once it is there it is always there .
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Old 12-24-2018, 11:21 AM   #66
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Re: Osb Vs Plywood In Shearwalls


There's pluses and minuses to either OSB or Plywood, the biggest one being the price. OSB is heavier but it's also more consistent, edge swelling is a big concern and quality of plywood is a concern with more voids at times then is desirable.

In regard to shear as long as one gets the proper product either one will work.

Regarding the water issue OSB, unless it's Advantech, has more water retention then plywood. Ideally of course, water won't be an issue but we don't live in an ideal world and if a leak does occur OSB is going to take a lot longer to dry out then plywood is.

I can't remember the dude's name but he is a moisture control and issues specialist, mostly does big commercial stuff. With newer buildings being more and more tight water retention can be a big problem so he was hired by the state of California to present seminars on how to avoid water retention at the energy efficiency centers strewn around the state. He had a very powerful presentation with a ton of slides showing catastrophic water issues resulting in all of the sheathing having to be replaced on large structures and in his opinion OSB is much more susceptible to having serious issues if it gets wet vs. plywood. It makes sense when you think about it as the strands in the OSB go in many directions and aren't connected physically (they're bonded with glue) whereas plywood retains its continuity per ply.
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Old 12-24-2018, 11:37 AM   #67
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Re: Osb Vs Plywood In Shearwalls


Most OSB is porous. I think that makes a difference in how it absorbs, plus end grain absorbs and wicks. OSB has tons of endgrain. It it gets wet, it really needs to have good drying conditions.
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Old 12-24-2018, 12:10 PM   #68
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Re: Osb Vs Plywood In Shearwalls


Nailing pattern and sheathing thickness seem to be the greater impact on shear walls.

You could poke around the APA website. Hell you could even speak to someone there for technical evaluation reports. If you thought 1/2 osb was weaker and half the price bumping it to 5/8 would likely exceed the shear strength and still be cheaper.
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Old 12-24-2018, 12:26 PM   #69
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Re: Osb Vs Plywood In Shearwalls


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Nailing pattern and sheathing thickness seem to be the greater impact on shear walls.

You could poke around the APA website. Hell you could even speak to someone there for technical evaluation reports. If you thought 1/2 osb was weaker and half the price bumping it to 5/8 would likely exceed the shear strength and still be cheaper.
You ever sheet a 40+ square roof by yourself using 5/8 OSB? You’ll only do it once.
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Old 12-24-2018, 01:18 PM   #70
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Re: Osb Vs Plywood In Shearwalls


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You ever sheet a 40+ square roof by yourself using 5/8 OSB? You’ll only do it once.
No I haven't and wouldn't but used plenty of 3/4 cdx on roof's. I thought the topic was walls? I didn't read every post in between if it changed.
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Old 12-24-2018, 01:49 PM   #71
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Re: Osb Vs Plywood In Shearwalls


The plywood today isn't anything like the plywood of yesteryear. It's very common to get 3/8" shear called out here on many homes, plywood is far from flat. OSB is very consistent. I travel past many homes I framed from as far back as 17 - 18 years ago where we used OSB I just don't see them having any issues. They aren't falling apart and I myself would have no problem owning one of those homes.

Because something can happen doesn't mean it ever will. The real question is what's likely to happen. Experience tells me OSB is perfectly fine as shearwalls and I will not hesitate to use it in the future. The OSB has come a long way since its inception.
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Old 12-24-2018, 02:01 PM   #72
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Re: Osb Vs Plywood In Shearwalls


Wood Structural panels provide an enormous amount of support. We have adopted inspections for gaping the panels for shrinkage but none for nails which would scare me with 3/8 sheathing. Guys have too much air pressure in the gun and blast through half the thickness.

Understand that section of the code is crazy. I took a couple of seminars on shear walls when they came around to fill EU credits. The triggers are amount of openings in a wall and the size of the Structural panel left after cutting out windows and doors. A decent grasp of that code section and some common sense from the builder would hold more weight than an architects.
Most of the architects I know deal with little to no structural work since make their primary living in commercial and the office employs an engineer. They can organize your ADA and Egress stuff though
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Old 12-24-2018, 02:03 PM   #73
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Re: Osb Vs Plywood In Shearwalls


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Wood Structural panels provide an enormous amount of support. We have adopted inspections for gaping the panels for shrinkage but none for nails which would scare me with 3/8 sheathing. Guys have too much air pressure in the gun and blast through half the thickness.

Understand that section of the code is crazy. I took a couple of seminars on shear walls when they came around to fill EU credits. The triggers are amount of openings in a wall and the size of the Structural panel left after cutting out windows and doors. A decent grasp of that code section and some common sense from the builder would hold more weight than an architects.
Most of the architects I know deal with little to no structural work since make their primary living in commercial and the office employs an engineer. They can organize your ADA and Egress stuff though


Our inspectors walk each panel and are very critical about over sunk nails. Major fail if they see that.


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Old 12-24-2018, 02:07 PM   #74
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Re: Osb Vs Plywood In Shearwalls


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There's pluses and minuses to either OSB or Plywood, the biggest one being the price. OSB is heavier but it's also more consistent, edge swelling is a big concern and quality of plywood is a concern with more voids at times then is desirable.

In regard to shear as long as one gets the proper product either one will work.

Regarding the water issue OSB, unless it's Advantech, has more water retention then plywood. Ideally of course, water won't be an issue but we don't live in an ideal world and if a leak does occur OSB is going to take a lot longer to dry out then plywood is.

I can't remember the dude's name but he is a moisture control and issues specialist, mostly does big commercial stuff. With newer buildings being more and more tight water retention can be a big problem so he was hired by the state of California to present seminars on how to avoid water retention at the energy efficiency centers strewn around the state. He had a very powerful presentation with a ton of slides showing catastrophic water issues resulting in all of the sheathing having to be replaced on large structures and in his opinion OSB is much more susceptible to having serious issues if it gets wet vs. plywood. It makes sense when you think about it as the strands in the OSB go in many directions and aren't connected physically (they're bonded with glue) whereas plywood retains its continuity per ply.
yup. As I found out.

Perhaps as little as 2-3 tablespoons of water entering per rain event, getting behind the tyvek, and tracking down to the bottom of the stud wall.

Brick veneer kept it from drying out. Not so much as a hint of staining on the drywall side.

But ho lee fook - what havoc in a short period of time.

...and like I said - no clue anything was going on.

Bet there's a ton of structures where this is going on. May lie undiscovered for years.

And yes, I will continue to use OSB type product.
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Old 12-24-2018, 02:14 PM   #75
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Re: Osb Vs Plywood In Shearwalls


Stone and masonry veneers where the contractor didnt understand the value of doubling the tar paper and used a single layer of Tyvek are time bomb
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Old 12-24-2018, 02:21 PM   #76
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Re: Osb Vs Plywood In Shearwalls


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Stone and masonry veneers where the contractor didnt understand the value of doubling the tar paper and used a single layer of Tyvek are time bomb
bless your heart
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Old 12-24-2018, 02:47 PM   #77
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Re: Osb Vs Plywood In Shearwalls


I can't recall ever seeing TJI'S infill webbing made of plywood. If I have I don't remember.


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Last edited by Calidecks; 12-24-2018 at 02:49 PM.
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Old 12-24-2018, 02:53 PM   #78
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Re: Osb Vs Plywood In Shearwalls




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Old 12-24-2018, 02:53 PM   #79
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Re: Osb Vs Plywood In Shearwalls


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I can't recall ever seeing TJI'S infill webbing made of plywood. If I have I don't remember.


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One time I found a 25’ long scrap of osb ..... it took me forever to figure out what it was from
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Old 12-24-2018, 07:50 PM   #80
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Re: Osb Vs Plywood In Shearwalls


What Engineers love about manufactured materials is that they are consistently crappy through and through.

Building codes DON't reward the post water event survival of different products since it is untested by the rating agency, that is usually a group of manufacturer seeking a work around a high value commodity, Veneer logs vs plup wood lumber....

In most parts of Southern California it so dry (see recent fires) keeping wood damp enough to rot is hard to achieve away from a constant water source or ground contact. Most climes will allow some rotting during the "wet" and cold seasons....

At some point designing areas of homes/wall/floor systems that slow air flow enough to generate liquid water, with out enough flow of dry air to evaporate the liquid water prior to its damaging the parts of building it is contact with, will be considered less then desirable.

Any one who believes rated exterior Plywood doesn't have advantages over standard OSB in most situations, has an integrity issue.

One could Paint and back prime sheathing around and below every opening to increase it post wetting survival time.... spray on sealer? the greatest return is given by painting the cut edges, repainting the factory edge sealers.

What is the standard detail to deal with the extra width of a shear panel adjacent to Nominal width walls?, 1/2" bump outs?

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