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Old 07-02-2011, 07:31 PM   #16
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Originally Posted by Hrose77 View Post
What is "blocking" that people are referring to?
Anywhere I’ve ever worked the wall sheathing must have full perimeter nailing.

If you run the sheets vertically this is achieved by the studs and the top and bottom plates.

If you run the sheets horizontally the top edge of the first row of sheets will only have the studs to nail to. You need to add a row of blocking between the studs for nailing.

The blocks not only for nailing but also a fire stop.

If the sheathing is installed as mentioned (horizontally with no blocks and a gap between the sheets) this would be inviting fire to enter the wall cavity.

Look around at new construction I doubt you will see many if any with horizontal sheathing. Any strength it may add is outweighed by the extra material and labor cost to the framer.

Plumbers and electricians don’t think much of it either.

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Last edited by kwikfishron; 07-02-2011 at 07:52 PM.
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Old 07-02-2011, 08:03 PM   #17
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Quote:
Originally Posted by kwikfishron View Post
Anywhere I’ve ever worked the wall sheathing must have full perimeter nailing.

If you run the sheets vertically this is achieved by the studs and the top and bottom plates.

If you run the sheets horizontally the top edge of the first row of sheets will only have the studs to nail to. You need to add a row of blocking between the studs for nailing.

The blocks not only for nailing but also a fire stop.

If the sheathing is installed as mentioned (horizontally with no blocks and a gap between the sheets) this would be inviting fire to enter the wall cavity.

Look around at new construction I doubt you will see many if any with horizontal sheathing. Any strength it may add is outweighed by the extra material and labor cost to the framer.

Plumbers and electricians don’t think much of it either.
It's a regional thing. I framed along the East Coast of NJ for 20 years. Never was blocking required for perimeter nailing on exterior sheathing and it was installed horizontally 99% of the time.

We always space our seams and edges. Many of the buildings are less than 10' apart in some communities.

4' setbacks required fire rated sheathing panels, 5' did not, however all bearing walls were required to have 5/8 Type X drywall on the interior.
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Old 07-02-2011, 08:57 PM   #18
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Not the distance, as loneframer said: http://publicecodes.citation.com/ico...9_3_sec002.htm

I don’t think the blocks were for fire-stop, only at ceiling/floor and every 10’ horizontally: http://publicecodes.citation.com/ico...002_par031.htm

Blocking is for shear walls as I quoted above, depends on your location for the seismic/wind design: http://publicecodes.citation.com/ico...001_par004.htm

The shear values are way different depending on orientation without blocks: http://www.trioforest.com/pdf/Load-Span_Tables.pdf:, Table 1: The blocks even it out, though I have no idea how much.....


Example: http://www.awc.org/pdf/WFCM_90-B-Guide.pdf

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Old 09-25-2011, 08:59 AM   #19
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If nailed incorrectly sidewall installed would corner bracing fix the problem with the integrity of the structure
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Old 09-25-2011, 09:38 AM   #20
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"djc125"
What kind of corner bracing are you referring to?
"Let-in" - "T-strips" ...

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Old 09-26-2011, 08:16 PM   #21
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Quote:
Originally Posted by kwikfishron View Post
Anywhere I’ve ever worked the wall sheathing must have full perimeter nailing.

If you run the sheets vertically this is achieved by the studs and the top and bottom plates.

If you run the sheets horizontally the top edge of the first row of sheets will only have the studs to nail to. You need to add a row of blocking between the studs for nailing.

The blocks not only for nailing but also a fire stop.

If the sheathing is installed as mentioned (horizontally with no blocks and a gap between the sheets) this would be inviting fire to enter the wall cavity.

Look around at new construction I doubt you will see many if any with horizontal sheathing. Any strength it may add is outweighed by the extra material and labor cost to the framer.

Plumbers and electricians don’t think much of it either.

It's pretty much all horizontal here, considered pretty standard. No blocking between sheets where they meet horizontally, quarter inch or so gap left between the sheets horizontally, most guys stick a pencil in between the sheets to get the gap. No worry about fire blocking since this is done between floors. Sheets are returned over openings, no joins at the corner of a RO.



Interesting how things are different from region to region.


Last edited by chrisBC; 09-26-2011 at 08:28 PM.
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