Basement Work: February 2007
Updated 13 June 2011
We live very close to the Hayward Fault so my first order of business
after moving in was to install shear walls to ensure that the house
doesn't fall off of the foundation during an earthquake. We moved
in on Sunday, January 28th and the shear walls were done by the
following Sunday, February 4th. I finished in time to see the last
half of the Super Bowl.
|This photo shows how not to brace your cripple walls.
The metal strap will be useless during an earthquake.
|Proper shear walls consist of 1/2" structural 1 grade
plywood nailed approximately every 4 to 6 inches with 10 d
nails. Each side of the house has about 16 total feet of
shear wall. The section in the photo above is 4 feet wide.
|And the shear walls are not complete unless the mudsill is
bolted to the foundation. These are 1/2" diameter x 6
inch long galvanized bolts by Simpson. Drilling the holes
for these bolts is no fun at all.
Later in the month I cleared all of the trash from underneath the
house. It consisted of 400 pounds of rotting and junk timber, lots
of trash, and I don't know how many pounds of broken up concrete.
Much of the work took place in very sticky mud as water has found its
way under a part of the house.
Updated 13 June 2011:
After seeing the incredible amount of bolting and shear walls that
went into the addition, I decided my shear wall work was a bit
subpar, so I added more shear wall panels, more sill anchors, and
also put in several Simpson UFP (universal foundation plate) where
lack of headroom previously prevented me from putting in sill
anchors. If you look close, you can see that I had to chip away the
concrete to be able to screw the UFPs to the sills.
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