Replies

1. 
   Guest_ | Jun 07, 2000 10:39pm | #1

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   The first answer is yes it would boost the specifications of the shear wall to glue it. The question is why do you need to?

   Unless it has been specified for some technical requirements, it would be a waste of time to do so.

   Gabe

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   Guest_ | Jun 08, 2000 10:10am | #2

   *recently seen detail in Seattle: eight 2x6 doug-fir studs glued each side and face nailed together with 3" o.c. . staggered .161 x 3-1/2 nails... I think the glue was to keep these stud packs from exploding. Why can' t a structural engineer work in the field for just a little while before they get their magic wands?Dana, if this might be the only shear wall you build in your life, then I say :b GLUE THE BEJEEBERS OUT OF IT JUST FOR FUN

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   Guest_ | Jun 18, 2000 12:33am | #3

   *I can't recall a time I've seen roof sheathing glued down. Maybe a regional experience. I know it would piss the crew off. The science of shear walls has been done for the most part, Dana. Follow the standards and you'll have what you need unless the plans call for something beyond normal specs in which case you really follow instructions. Usually, an upgrade in structure such as shear walls having some increased performance will occur in tandem with other elements of the building given a dose of the same medicine. If you got nothing but time and money on your hands, make yourself happy. Next big weather disaster we have somewhere, like hurricane season, you'll see alot of damage caused by marginal adherence to existing standards. Not because everybody wasn't out there quart glue gun squirting everything in sight. The various building trade mags have run many an article on good shear wall construction practice, some techniques as simple as not letting the driver pin on your nail gun push the nail head two-thirds of the way through the sheathing. Me, I stick to recommended fastner schedules for spacing and shank thickness of fastner as well as using a flush nailing head to not overdrive fastners. It's all standing so far.

1. 
   Guest_ | Jun 18, 2000 02:17am | #4

   *I remember reading that certain construction adhesives have no shear value because they either get brittle, or never totally set up and therefore the two members will "creep" when stressed. This is the second time I've read here at Breaktime a refrence to gluing roof sheathing, but I've never seen it or heard of it anywhere else.

1. 
   Guest_ | Jun 22, 2000 04:02pm | #5

   *Out here in my little piece of CA. it sounds as though this could be a moot point pretty soon. The prebuilt shear panels seem to be specified on a lot of the new construction going on. The guy who engineered my plans said you can get around it if the loadings are kept below a certain limit, but on things like return walls on garages and such, I think its about all you can use now.

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   godfrey_bell | Jun 23, 2000 05:05am | #6

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   here in Montana where winds often gust to over 100 miles an hour, we glue the panels to the end walls of garages and tie the panels either into the gable truss, or the floor truss system above the garage. at the same time, we make sure that all wall panels have continuous nailing around the perimeter of each sheet. on some commercial jobs we have been asked to provide continuous nailing on roof sheathing; there installing 22 1/2" 2x4s in each bay, on each row as we climb the pitch. i belIeve that for plywood/osb psobls to provide effective shear they must be fastened around the perimeter in accordance the manufacturers fastening schedual.

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   Guest_ | Jul 06, 2000 02:49am | #7

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   On my father's house, we have a four car garage with two doors side by side, each 20 feet wide. The only place any shear walling could be done is on the two outboard sections of wall, each only 2 feet wide. Right after the Northridge quake, I decided to shear wall that for them, and went with yellow woodworking glue (aliphatic resin) in addition to nails, and 3/4" plywood. When you're trying to protect against an earthquake of unpredictable size, do as much as you can to help.

   -- J.S.

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   Guest_ | Jul 06, 2000 04:36am | #9

   *b TVMDCJohn, As a result of the Northridge Quake, the Los Angeles codes have changed considerably, especially with respect to the minimum width of shear panels. The previous ratio of height to width was 3.5:1, so with an 8' ceiling you could have a wall as narrow as 2'-4". Now the LA codes require a 2:1 ratio so the same 8' ceiling requires a 48" minimum wall width.Now, for garage doors and narrow wall sections with large windows or doors, engineers typically use a steel flagpole set in CNC to which the remaining wood framing is attached with bolts welded onto the poles.

4. 
   Dana_Lubow | Jul 06, 2000 04:36am | #8

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   My question is: Should shear walls be glued as well as nailed? Will it help improve the wall's performance? I know it helps with both roof and floor sheathing. Thanks alot.
   Dana