Yes, some screws would probably be better than hanger nails but hanger
nails are bettter than a lot of different types of screws. If screws
were allowed ......then someone, sometime, would be "out of the
correct screws" & then drywall screws (or whatever they had in their
pouch, truck or local hardware store) would get used.
Drywall screws would be the worst of the worst but many screws exhibit
brittle behavior. Nailed connections are know quantities, nearly
always exhibit ductile failure.
Drywall screws are for hanging drywall but I see them used for just
about any application imaginable.
So I guess the hanger mfrs just stick with nails " 'cuz that's the way
we've always done it". Plus nails install faster?
The wood can split. Many of the applications may call for teco or 16s
common or 10s common. Look up the nailing in the Simpson Strong Tie Book,
You may be surprised to find out that the nail you are using is not the nail
that is recommended.
Anyway, some joist hangers and H-1 or others use 16s or 10s common.
Strapping takes some differing nails.....
Again, it is the "shear" of the nail not the holding.........
Because the nailed item is less than 1/16" thick for the most part. That
gives you almost 1 1/2" penetration. Much of the hanger,holddown,nail
pattern logic defies common sense. We will see when the BIG ONE comes.
However I do trust the math. Its the nailing patterns I wonder about. tonyg
We do use some hex screws in PHD's
I know the reason is the strength.
The nail has great "shear" strength.
And as the other reports, some screws are hardened, and break.
I like to use Hot Dip Galvanized tecos....
Some of the teco nails just seem not to have holding power.(brights)
The only "hex screws" for use in Simpson PHD's are the Simpson SDS
screws...using anything else is asking for trouble....unless you
really know the screws & the particular application.
I know the SDS's are a little spendy but they're worth it. I used
them for strucutral testing of plywood shear panels (to attach fixture
to panel), we got many uses out of them, no problems, no
failures....more than I can say for HDepot (any where else) cheapo
Where have those black lags screws from the 50's & 60's gone? :(
When lags had 1/3 grip & 2/3 thread....not all over the map....no or
The idea isn't usually to hold something together, but holding
something up, in a way that the shear strength of the nails is way
more important than the holding friction keeping the nails in place.
The nails can be short, since the shear strength of a 2" teco nail
isn't much different than a 16d framing nail.
The shear strength of most screws is way lower.
Thanks guys, for all the info. From the Simpson site, it sounds like you
can use 16d's into the support header, on say a 2x10 floor joist hanger. I
can see how a shorter teco nail make more sense when nailing the joist
hanger to the joist.
Gotta read the Simpson footnotes for each connector. All sorts of
hidden gems. :) Different connectors spec different nails.
Their nail patterns baffle me & I did structural testing on wooden
specimen for over 10 years. The A35 is crazy.
Even the SDS's have a footnote that pre-drilling might be needed!
Most overlook that.
Simpson tried to get SDS concept to work in greater than 1/4"...just
wouldn't work reliably. :(
So SDS only in 1/4"....too bad awesome screws.
If you nail hangers to a built up beam say 2,2x10s nailed together than
you should nail the hangers with 16d sinkers or the 2 1/2" teco nail.
The idea is to get penetration into the far piece. The the load is on
both pieces. T
replying to RO, Tommy wrote:
Nails have higher shear strength than a similarly-sized screw because the
shank-diameter is larger. Because of the nature of the connection there isn't
much concern about withdrawal, only shear capacity. Also Simpson brand nails
are made from a harder steel than most screws.
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