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Post History
The key is in the name, in this case. Oriented Strand Board (generally shortened to OSB) means, literally, that the wood chips are (roughly) oriented so that the majority of them have the grain of...
Answer
#3: Post edited
by
Spamalot
·
2024-05-11T04:46:08Z (6 months ago)
- The key is in the name, in this case.
- **Oriented Strand Board** (generally shortened to **OSB**) means, literally, that the wood chips are (roughly) oriented so that the majority of them have the grain of the wood running the long direction of the panel.
- That strength axis should be perpendicular to the framing, the same way a board would be oriented, with the long fiber of the wood crossing the framing at or near 90 degrees.
- https://www.innovativepanel.com/wp-content/uploads/2015/11/American-Plywood-Association-Load-Span-Table.pdf
Includes a table (2a) for Oriented Strand Board (OSB) Sheathing, and a separate table (2b) for OSB Structual I Sheathing, and a third (2c) for OSB Sturd-I-Floor- These tables include information about floor loadings with the strength axis perpendicular to the supports and parallel to the supports.
- Those loadings are significantly smaller for the "parallel to the supports" case in almost every condition; strength where load is governed by shear is sometimes not reduced, or only slightly reduced.
- Examining the case of 32/16 sheathing (table 2a) supported at 16":
- - L/360 loading is 188 pounds per square foot (PSF) in the perpendicular case
- - L/360 loading is 41 PSF in the parallel case. (21.8%)
- - L/180 loading is 376 PSF perpendicular
- - L/180 loading is 82 PSF parallel (21.8%)
- - Bending is 209 PSF perpendicular
- - Bending is 54 PSF parallel (25.8%)
- - Shear is 207 PSF perpendicular _or_ parallel. (100%)
- The key is in the name, in this case.
- **Oriented Strand Board** (generally shortened to **OSB**) means, literally, that the wood chips are (roughly) oriented so that the majority of them have the grain of the wood running the long direction of the panel.
- That strength axis should be perpendicular to the framing, the same way a board would be oriented, with the long fiber of the wood crossing the framing at or near 90 degrees.
- https://www.innovativepanel.com/wp-content/uploads/2015/11/American-Plywood-Association-Load-Span-Table.pdf
- Includes a table (2a) for OSB Sheathing, and a separate table (2b) for OSB Structual I Sheathing, and a third (2c) for OSB Sturd-I-Floor
- These tables include information about floor loadings with the strength axis perpendicular to the supports and parallel to the supports.
- Those loadings are significantly smaller for the "parallel to the supports" case in almost every condition; strength where load is governed by shear is sometimes not reduced, or only slightly reduced.
- Examining the case of 32/16 sheathing (table 2a) supported at 16":
- - L/360 loading is 188 pounds per square foot (PSF) in the perpendicular case
- - L/360 loading is 41 PSF in the parallel case. (21.8%)
- - L/180 loading is 376 PSF perpendicular
- - L/180 loading is 82 PSF parallel (21.8%)
- - Bending is 209 PSF perpendicular
- - Bending is 54 PSF parallel (25.8%)
- - Shear is 207 PSF perpendicular _or_ parallel. (100%)
#2: Post edited
by
Spamalot
·
2024-05-11T04:00:57Z (6 months ago)
- The key is in the name, in this case.
- **Oriented Strand Board** (generally shortened to **OSB**) means, literally, that the wood chips are (roughly) oriented so that the majority of them have the grain of the wood running the long direction of the panel.
That strength axis should be perpendicular to the framing, the same way a board would be oriented, with the long fiber of the wood crossing the framing at or near 90 degrees.
- The key is in the name, in this case.
- **Oriented Strand Board** (generally shortened to **OSB**) means, literally, that the wood chips are (roughly) oriented so that the majority of them have the grain of the wood running the long direction of the panel.
- That strength axis should be perpendicular to the framing, the same way a board would be oriented, with the long fiber of the wood crossing the framing at or near 90 degrees.
- https://www.innovativepanel.com/wp-content/uploads/2015/11/American-Plywood-Association-Load-Span-Table.pdf
- Includes a table (2a) for Oriented Strand Board (OSB) Sheathing, and a separate table (2b) for OSB Structual I Sheathing, and a third (2c) for OSB Sturd-I-Floor
- These tables include information about floor loadings with the strength axis perpendicular to the supports and parallel to the supports.
- Those loadings are significantly smaller for the "parallel to the supports" case in almost every condition; strength where load is governed by shear is sometimes not reduced, or only slightly reduced.
- Examining the case of 32/16 sheathing (table 2a) supported at 16":
- - L/360 loading is 188 pounds per square foot (PSF) in the perpendicular case
- - L/360 loading is 41 PSF in the parallel case. (21.8%)
- - L/180 loading is 376 PSF perpendicular
- - L/180 loading is 82 PSF parallel (21.8%)
- - Bending is 209 PSF perpendicular
- - Bending is 54 PSF parallel (25.8%)
- - Shear is 207 PSF perpendicular _or_ parallel. (100%)
#1: Initial revision
by
Spamalot
·
2024-05-11T03:08:31Z (6 months ago)
The key is in the name, in this case. **Oriented Strand Board** (generally shortened to **OSB**) means, literally, that the wood chips are (roughly) oriented so that the majority of them have the grain of the wood running the long direction of the panel. That strength axis should be perpendicular to the framing, the same way a board would be oriented, with the long fiber of the wood crossing the framing at or near 90 degrees.