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Sheathing Over Rim Joist

 
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Old 01-22-2015, 12:33 AM   #21
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Re: Sheathing Over Rim Joist


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Originally Posted by wallmaxx View Post
We do shear as well.

Buy plywood to fit the wall height and apply it vertically. Minimizes all blocking.

Some rated walls spec. 3x6 or even 4x6 studs at the seams and for blocking. Gives better nailing material without splintering.
Exactly always use full sheets when you can get them. Much better for subs putting chit in the walls as well.

If our nailing schedule is 3" or less on edge nailing we have to use 3x.
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Old 01-22-2015, 12:33 AM   #22
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Re: Sheathing Over Rim Joist


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Originally Posted by Tom M View Post
Sheer walls are really designed for vertical sheathing. Blocking kicks in when you change directions. The code makes an exception allowing you to bypass blocking if your walls are full sheathed wood panels and exceed the need amount of shear wall. Thats why you dont see blocking with house fully sheathed in wood.

Go to gypsum or weaker material and you need blocking. Technically "full bearing" so double blocking where each side of the seam has 1.5" to attach to. You may have seen similar in narrow wall framing with garage openings.
The framing I did in Canada required all wall sheathing to be applied horizontal. And a 1" gap was required between the two sheets.........some code 2000 moisture control idea.
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Old 01-22-2015, 05:50 AM   #23
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Re: Sheathing Over Rim Joist


Tallwall, Windstorm & others all have varying sheathing sizes or you can just go with a 10' & rip - Zip wall is also now producing longer sheets

The reason to install vertically anywhere is less blocking (which is listed in the code, though very few do it), less air leakage, cut down on anchors / ties required.

If you are going with a raised heel / energy truss you can also use the tall sheets for the blocking & to tie it into the structure eliminating those hurricane straps. The APA site has some good tips & pieces on all of these methods - for more: http://thehtrc.com/2013/common-sense...wall-sheathing
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Old 01-22-2015, 09:32 AM   #24
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Re: Sheathing Over Rim Joist


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Originally Posted by Californiadecks View Post
We can't have any ply edge Un - nailed in a shear wall, which is usually the ply between two hold-downs.

For example if the walls are 10' tall and you only have 8' sheets we have to block it at the break or if we don't block it we have to use 10' sheets.
Im sure California being the most strict for siesmic you wont get any exceptions in the code. The amount of bracing panels and hold downs may make it impossible to exceed the sheathing minimums accepted else where. I dont think your even allowed you mix sheathing materials.

Do you ever see sheathing other than plywood or osb?
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Old 01-22-2015, 09:47 AM   #25
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Re: Sheathing Over Rim Joist


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Originally Posted by Tom M View Post
Im sure California being the most strict for siesmic you wont get any exceptions in the code. The amount of bracing panels and hold downs may make it impossible to exceed the sheathing minimums accepted else where. I dont think your even allowed you mix sheathing materials.



Do you ever see sheathing other than plywood or osb?

Yes. sheathing over rim joist-imageuploadedbycontractortalk1421937952.167761.jpgsheathing over rim joist-imageuploadedbycontractortalk1421938026.620074.jpgsheathing over rim joist-imageuploadedbycontractortalk1421938056.040704.jpg
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Old 01-22-2015, 10:21 AM   #26
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Re: Sheathing Over Rim Joist


You certainly do, what is your seismic area? We almost never see skipped sheathing
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Old 01-22-2015, 11:14 AM   #27
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Re: Sheathing Over Rim Joist


We don't know what seismic means here. We generally are using zip where there's stone or brick , and where the walls are over 10'. Zip on the whole garage and sometimes the walkout wall. The rest we've been using energy shield with Dow SIS for shear. The energy shield only comes in 8' or 9' while the SIS and zip we get in 10'. We only block for shear when the top isn't on a plate, and then anything over 10'.
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Old 01-22-2015, 02:00 PM   #28
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Re: Sheathing Over Rim Joist


Quote:
Originally Posted by Tom M View Post
Im sure California being the most strict for siesmic you wont get any exceptions in the code. The amount of bracing panels and hold downs may make it impossible to exceed the sheathing minimums accepted else where. I dont think your even allowed you mix sheathing materials.

Do you ever see sheathing other than plywood or osb?
No I've never seen it. It's usually all struct 1
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Old 01-22-2015, 02:09 PM   #29
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Re: Sheathing Over Rim Joist


Here's an example of a shear schedule I did a while back. It doesn't actually call out for blocking but in order to get 4" nailing on the edges (E.N.) you have to block them if your sheets aren't tall enough. This is by default always called out by the engineers.
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Old 01-22-2015, 03:13 PM   #30
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Re: Sheathing Over Rim Joist


Thats a good detail, pretty common Im sure. We wont even get hardware called out here, most of the time. There is a code section on panel joints of braced panel construction in the IRC. Your state is the obviously the most strict.
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Old 01-22-2015, 03:27 PM   #31
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Re: Sheathing Over Rim Joist


The sheathing has to go plate to plate for shear walls so if you're using 8' sheets and have an 8' wall start it on the bottom plate and use fill pieces for the rim, follow the plans for the shear transfer from the rim to the walls (A35's or LTP's).
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Old 01-22-2015, 03:31 PM   #32
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Re: Sheathing Over Rim Joist


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Originally Posted by Tom M View Post
Thats a good detail, pretty common Im sure. We wont even get hardware called out here, most of the time. There is a code section on panel joints of braced panel construction in the IRC. Your state is the obviously the most strict.
I would love to frame a home with you in your area. Funny thing is I've worked in homes from way back that didn't have one hold down at all in them. Guess what? I drive by those homes daily and they are still sitting on their foundations just like they were left.
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Old 01-22-2015, 03:41 PM   #33
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Re: Sheathing Over Rim Joist


Its true....makes you wonder with the new codes like deck ledgers, or fire sprinklers. The house will be destroyed from water damage if it survives a fire.. I remember a simpson seminar showing a house in Galveston Texas that survived a hurricane because it was built for it. There was nothing left around it, so it survived but the area was un inhabitable.
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Old 01-23-2015, 07:34 PM   #34
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Re: Sheathing Over Rim Joist


on a continuous sheeted house, i always block my seems over 4" ....... We usually only continuously sheet the house if there is a wall bracing plan, or if the builder is using zip, or floor trusses.... I block all the seams, even though i'm not required, mainly to keep the osb from bowing
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Old 01-23-2015, 07:47 PM   #35
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Re: Sheathing Over Rim Joist


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Originally Posted by Californiadecks View Post
I would love to frame a home with you in your area. Funny thing is I've worked in homes from way back that didn't have one hold down at all in them. Guess what? I drive by those homes daily and they are still sitting on their foundations just like they were left.
That's a good point; in many older houses the only metal in all the framing is the nails. Like many things the building code has gone way overboard in a lot of cases and as a result houses and remodeling gets more and more expensive which shrinks the pool of people who can afford the work.
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Old 02-01-2015, 05:49 AM   #36
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Re: Sheathing Over Rim Joist


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I am framing a house with 11 7/8 tji floor joist and 8' walls. Should I start sheathing at bottom sill and install blocking at the sheet break or start with a small piece at the bottom and install a full sheet to the top. A 9' sheet falls a couple inches short. I've framed 7 houses but all slab on grade first one with a rim joist. I have an idea but just wanted confirmation.
First option, that will pass inspection.
Attach the shear wall plywood to the mudsill bottom plate and install blocking per the shear wall schedule 24" down from the wall top plate. No piece of shear wall plywood shall be less than 24" wide.

Second option, that might not pass inspection.
Start with a small piece at the bottom mudsill and install a full sheet to the top and make sure the rim joist has LTP4's from the wall bottom plate to rim joist per shear wall schedule. Providing that your rim joist has A35's from the rim joist to mudsill per shear wall schedule.

Third option, never eve ask a question on this forum on shear wall framing. The building codes in California have nothing to do with the rest of the country.

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Old 02-01-2015, 07:51 AM   #37
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Re: Sheathing Over Rim Joist


The California houses/buildings are so tight you could literally take them off their foundations roll them around the block and put them back in place and nothing has moved or shifted.

It has nothing to do with saving the structure, it's all about life safety
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Old 02-01-2015, 04:17 PM   #38
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Re: Sheathing Over Rim Joist


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The California houses/buildings are so tight you could literally take them off their foundations roll them around the block and put them back in place and nothing has moved or shifted.

It has nothing to do with saving the structure, it's all about life safety
I will personally attest to that.
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Old 02-05-2015, 05:21 PM   #39
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Re: Sheathing Over Rim Joist


when you are all done with the shear wall blocking the house will slide down the hill at a set rate per pound
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Old 02-06-2015, 01:31 PM   #40
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Re: Sheathing Over Rim Joist


im in canada, locally we have to run our sheathing horizontally for a shear rating especially since were in a classified hurricane zone. shear walls have to have blocking at the seams of sheets as well . on tall walls our engineer sometimes specs the sheathing to be 3/4 glued and screwed

as for hanging sheathing over the rim board, sometimes we do it but typically dont then fill it in after words. we mostly do additions so its not always practical.

2 years ago we did a large addition where on one portion of the house the existing first floor system was kept but all the walls torn down, the existing rim was a rough sawn 6x10 that was extremely uneven... because of that we coiuldnt hang the sheathing do to it being so irregular. it would be impossible to set the wall on the chalk line so we actually had to omit the sheathing in a few spots on the rim and switch to 1/2" foam instead of 1" in order to keep the wall somewhat flat for siding.. one of my guys tried arguing with me about not hanging the sheathing but he doesnt have the common sense to realise what the issue was we were dealing with, he was told countless times to shut the $%## Up by myself and others on the crew, the gc and even the homeowner

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