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Osb Vs Plywood In Shearwalls

 
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Old 12-24-2018, 07:57 PM   #81
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Re: Osb Vs Plywood In Shearwalls


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Any one who believes rated exterior Plywood doesn't have advantages over standard OSB in most situations, has an integrity issue.
Uh... Whut?
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Old 12-24-2018, 08:05 PM   #82
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Re: Osb Vs Plywood In Shearwalls


There's rated exterior OSB

https://www.buildgp.com/product/blue...all-sheathing/


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Old 12-24-2018, 08:58 PM   #83
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Re: Osb Vs Plywood In Shearwalls


https://www.apawood.org/publication-search?q=&f=Plywood

The APA has lots of publications to. They consider Group 1 the strongest then 2 etc...
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Old 12-24-2018, 09:43 PM   #84
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Re: Osb Vs Plywood In Shearwalls


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Originally Posted by Californiadecks View Post
Our inspectors walk each panel and are very critical about over sunk nails. Major fail if they see that.


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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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Old 12-26-2018, 12:26 AM   #85
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Re: Osb Vs Plywood In Shearwalls


If I need a 4' x 9' high shear wall inside a building, do I panel the wall the whole wall length? Or use a corner bead for the 1/2-5/8ths return?


Special order 2 x 3 " studs?

Wouldn't it be cheaper to use fewer fasteners in thicker shear wall panels many times?
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Old 12-26-2018, 02:26 AM   #86
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Re: Osb Vs Plywood In Shearwalls


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Originally Posted by Fouthgeneration View Post
If I need a 4' x 9' high shear wall inside a building, do I panel the wall the whole wall length? Or use a corner bead for the 1/2-5/8ths return?


Special order 2 x 3 " studs?

Wouldn't it be cheaper to use fewer fasteners in thicker shear wall panels many times?
You rip down the studs where the sheer goes.
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Old 12-26-2018, 02:35 AM   #87
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Re: Osb Vs Plywood In Shearwalls


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You rip down the studs where the sheer goes.
if architect/engineer approve.

typical detail where architect goes...oh chit....
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Old 12-26-2018, 08:10 AM   #88
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Re: Osb Vs Plywood In Shearwalls


Gypsum counts as a wall panel. Properly blocked.

If plywood was the route, I would pick up and extra sheet to rip furring for the other studs.
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Old 12-26-2018, 09:17 AM   #89
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Re: Osb Vs Plywood In Shearwalls


Quote:
Originally Posted by Californiadecks View Post
https://youtu.be/MY0Y-ZB1LzA


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Old 12-26-2018, 04:21 PM   #90
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Re: Osb Vs Plywood In Shearwalls


You think there would be Structural plywood with some layers orientated parallel with the shear load, roughly corner to corner.

Again I think some posters are mixing seismic panels that are intended to ABSORB energy through destruction of the product around the fasteners and garden variety wind load/uplift shear panels that last as long as the building does...

At some point will engineers require some type of shear connector band-aide at every corner of a wood framed building?
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Old 12-26-2018, 09:27 PM   #91
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Re: Osb Vs Plywood In Shearwalls


If they were a bad choice Simpson wouldn't use them for strong wall.

Rated is rated.


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Old 12-26-2018, 09:29 PM   #92
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Re: Osb Vs Plywood In Shearwalls


A rating is a calculation. It either meets it or it don't.


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Old 12-26-2018, 10:51 PM   #93
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Re: Osb Vs Plywood In Shearwalls


Quote:
Originally Posted by griz View Post
if architect/engineer approve.

typical detail where architect goes...oh chit....
you could be right. It's how we sheered many homes on the tracks. We'd rip down the top&bottom pates and studs and use a sheet of ¾" on the 2 ends of the walls.
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Last edited by Dirtywhiteboy; 12-26-2018 at 10:55 PM.
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Old 12-27-2018, 01:01 AM   #94
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Re: Osb Vs Plywood In Shearwalls


The smartest engineer I've ever worked with always did things on the beefy side and when questioned would always come back with 'building codes are a minimum'. Keeping that in mind we'd always go ahead and sheath the entire sides of the structure to make it all stay on one plane.

California has a lot of stucco for the exterior and it's very common in that case for the builder to pick up the change in plane with more stucco, never liked this because it increases the crease/tear potential for the housewrap where the ply or OSB ends but it's very common and works.

Stucco and gyp board can't be counted for shear value in a lot of seismic zones.
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Old 12-27-2018, 10:28 AM   #95
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Re: Osb Vs Plywood In Shearwalls


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Originally Posted by Rio View Post
The smartest engineer I've ever worked with always did things on the beefy side and when questioned would always come back with 'building codes are a minimum'. Keeping that in mind we'd always go ahead and sheath the entire sides of the structure to make it all stay on one plane.

California has a lot of stucco for the exterior and it's very common in that case for the builder to pick up the change in plane with more stucco, never liked this because it increases the crease/tear potential for the housewrap where the ply or OSB ends but it's very common and works.

Stucco and gyp board can't be counted for shear value in a lot of seismic zones.


And when they do count gypsum there's a nailing schedule reflected on the plans.


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Old 12-27-2018, 06:23 PM   #96
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Re: Osb Vs Plywood In Shearwalls


A little more info on the Gyp option
https://www.americangypsum.com/sites...0Sheathing.pdf
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Old 12-28-2018, 01:45 PM   #97
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Re: Osb Vs Plywood In Shearwalls


The word "sheathing" in Research Report 154 published by the American Plywood Association can either be OSB or plywood. The only distinction being that OSB and plywood can either be Structural 1 or rated sheathing. Otherwise, from a seismic point of view they are identical. We use plywood because it is lighter and does not tear up the saw blades as fast.

If you go to Bayarearetrofit.com then Resources on the main menu bar and drop down to PDF Library, open up the library and look for APA Research Report 154 you will find a copy of the report. Go to Table 1. When you look through the tables on stapled shear walls there is mention of OSB which you might find interesting.

I will be uploading some other documentation I have regarding OSB and plywood on the website soon since there appears to be come interest in this topic.

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Old 12-28-2018, 04:17 PM   #98
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Re: Osb Vs Plywood In Shearwalls


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The word "sheathing" in Research Report 154 published by the American Plywood Association can either be OSB or plywood. The only distinction being that OSB and plywood can either be Structural 1 or rated sheathing. Otherwise, from a seismic point of view they are identical. We use plywood because it is lighter and does not tear up the saw blades as fast.

If you go to Bayarearetrofit.com then Resources on the main menu bar and drop down to PDF Library, open up the library and look for APA Research Report 154 you will find a copy of the report. Go to Table 1. When you look through the tables on stapled shear walls there is mention of OSB which you might find interesting.

I will be uploading some other documentation I have regarding OSB and plywood on the website soon since there appears to be come interest in this topic.

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Thankyou .I had not seen the library .Good info .
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Old 12-28-2018, 08:34 PM   #99
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Re: Osb Vs Plywood In Shearwalls


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Originally Posted by Howard Cook View Post
The word "sheathing" in Research Report 154 published by the American Plywood Association can either be OSB or plywood. The only distinction being that OSB and plywood can either be Structural 1 or rated sheathing. Otherwise, from a seismic point of view they are identical. We use plywood because it is lighter and does not tear up the saw blades as fast.



If you go to Bayarearetrofit.com then Resources on the main menu bar and drop down to PDF Library, open up the library and look for APA Research Report 154 you will find a copy of the report. Go to Table 1. When you look through the tables on stapled shear walls there is mention of OSB which you might find interesting.



I will be uploading some other documentation I have regarding OSB and plywood on the website soon since there appears to be come interest in this topic.



Howard Cook

Owner/Founder

Bay Area Retrofit


Great first post! Welcome!


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Old 12-28-2018, 09:02 PM   #100
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Re: Osb Vs Plywood In Shearwalls


I got this from the American Plywood Association

The following is in response to your request for information regarding the equivalence of oriented strand board (OSB) sheathing to structural plywood sheathing.

As an organization responsible for writing standards and a recognized third party quality assurance agency and wood products testing laboratory our opinion is that OSB sheathing is comparable to structural plywood sheathing. In addition the California Building Code and the California Division of State Architect recognize the equivalence of OSB and structural plywood.

1. Both OSB and plywood are produced under U.S. Voluntary Product Standards: PS 1-09 for Structural Plywood, and PS 2-10 for OSB and some Plywood Sheathing.
a. Both products are assessed for the same Span Rated grading levels.
b. Both OSB and plywood are manufactured using water resistant resins that maintain their structural capabilities after severe moisture exposure.
c. Both products are qualified to meet the standard’s Exposure 1 adhesive bond durability classification.

2. The California Building Code (CBC) recognizes plywood and OSB equally as wood structural panels, reference 2010 CBC Sections 2302.1 Definitions and 2303.1.4 Wood structural panels.

3. The CBC additionally recognizes wood structural panel shear walls and horizontal diaphragms without discrimination as to whether the panel is plywood or OSB, reference 2010 CBC Sections 2306.2.1 Wood structural panel diaphragms and 2306.3 Wood structural panel shear walls. Also note that both of these sections state that wood structural panel diaphragms and shear walls shall be designed in accordance with AF&PA SDPWS1, which like the CBC accepts OSB and plywood equally for wood structural panel diaphragms and shear walls.

4. The California Division of State Architect (DSA), which regulates the design and construction of state institutional buildings such as schools, universities and prisons, recognizes the comparable performance of structural plywood and OSB in accordance with the CBC. Some time ago DSA issued a revised Interpretation of Regulations, IR 23-6, which permits the use of OSB without shear capacity reductions and additional limitations for DSA projects submitted under CBC provisions.

I have provided a link to the following APA publication regarding the use of Wood Structural Panels in California DSA Projects:

· Technical Topics: Wood Structural Panels for California Division of State Architect Projects, Form TT-106

In accordance with California regulations, all projects submitted after January 1, 2009 shall be reviewed under the provisions of the 2007 California Building Code (CBC).

Section 2302 of the 2007 CBC recognizes plywood and oriented strand board (OSB) under the definition of Wood Structural Panel. Revised October 9, 2014.

For an additional discussion of the equivalency of structural plywood and OSB refer to APA Technical Topic TT-047:

· Technical Topics: Plywood or OSB? Used as Intended, the Two Products are Interchangeable, Form TT-047

Thank you for contacting APA,

Drake Joslin
Product Support Specialist
Wood Products Support Help Desk
APA
253-620-7400 (phone)
253-565-7265 (fax)
[email protected]

www.APAwood.org

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