I'm planning to build a 16'x24' gambrel barn on a concrete pad. My plans
call for a double sill plate. Is there any value in doing this as opposed to
a single 2"x4" sill plate? Cost is not a factor. I'm just curious if there
is added benefit in this design. It also seems to me that I would cheat the
depth the J-bolts can be embedded in the contrete by the extra 1.5" needed
to penetrate the second sill plate.
Your thoughts & comments are appreciated.
Thanks in advance.
You're smiling - but my experience with my contractor says it's
all too true. I don't think his framers bothered with the
level, the tape, or even the plans.... it was not a pleasent
Your right I am smiling. No one takes the time to level and square the the
plates and then they wonder why the building is so out of whack when they get
the the third floor! Takes too much time to use a level and pull a couple of
diagonal tapes. Maybe they could cut their coffee break time down and do it
There might be if you live in a seismically active area. _Fine
Homebuilding_ had an article a few years back on lessons
learned from the Loma Linda and other quakes. One common cause
identified for major structural failure was sill plates shearing
and spliting away from the anchor bolts resulting in the
structure slipping off the foundation. The conclusion was that
thicker sill plates would be benefical. No failures were
observed in thicker or doubled plates.
I beefed up my plates when I built based on the article.
If you search the Taunton Press web site you might still be able
to view the article.
That thought had crossed my mind. Don't think Houston is active although we
do have shifting soil.
I noticed last night when reviewing the plan again that it calls for me to
scoop out the second bottom plate to accomodate the nut-end of the bottom
plate's j-bolt. The second plate would then be nailed to the bottom one.
This looks weird to me. I don't see this as being as strong as a j-bolt
connection. I would prefer to use a j-bolt through both plates but that
cannibalizes the amount of bolt available to sink into the cement. It
doesn't look like I can win. I'll see if I can get the Fine Homebuilding
article. Perhaps that will shed some light.
The conclusion was that
I have a single 4x6 PT sill plate and the J-bolts were plenty
long. Can't you get any longer bolts? I think Simpson makes
Just make sure you set the bolts accurately so they're centered
in your new beefed up plate for maximum strength.
Here's what my contractor tried to get away with on my upgraded
There were 15 of these with less than 3/4" of wood between the
bolts and the edge of the sill plate... kind of defeats
upgrading the sill plate to enhance tearout resistance... duh!!
He had a fit when I made him drill and epoxy new bolts - and it
all could have been avoided with a 2 min jig made from scrape to
place the bolts accurately.
Don't know Simpson but I'll look for them. I couldn't find any j-bolts
locally or on the net except 6". Assuming 3-1/2" for two 2x4s and a little
extra for the nut & washer leaves 2-1/2" to lock into the cement. That's not
enough. I could only find 10" eye bolts which I'll use if I have to. Cheers.
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