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Excellent video

Great Video, I just qualified for the Earthquake Brace and Bolt program so I'm trying to learn as much as I could in a short amount of time. This video was better than the ones on the EBB website. I do have a question: For a post and pier foundation, with a masonry perimeter (stone & mortar), can you anchor the mud sill to the stone wall? Or will you it be best to create new cripple walls along the interior of the crawl space? Thank you!

5:47 Guys Can anyone find a video of table shaking earthquake test in this minute of the video?

I reside in Oregon where we are vulnerable to an expected and extremely powerful earthquake due to the Cascadia subduction zone off our coast. Though our building codes may differ. I found this video to be very informative on how to mitigate home damage from seismic activity

what is the size of the shake table ?

I was wondering- if my house has no cement foundation and is just on rocks on the ground and some post and pier could I just put a foundation in that comes up to the mudsill plate and eliminates the cripple wall? I am in Eugene oregon.

And I’m in bed, on a second story watching this video in Los Angeles. Sooooothing.

According to Simpson blog, and some documentation there are alternatives to nails, like the SD and SDS screws and depending on the coating can be pressure wood safe. I’m still in my prep phase for some DIY repairs on the cripple studs and adding retro walls. Theese videos are great ice breakers before I start reading my southern Cali fema guide.

This is awesome but what should you do to maximize safety from earthquakes? I live right near one! I was going to put on those Simpson ties so I won’t waste my money on these. I have beams supporting a 1-1/4” plywood floor so now floor joists. What should I do?

All this talks about is what NOT TO DO, how about WHAT TO DO ???

would have helped more if you showed the CORRECT way to do it and not shighting on others work

Once a shear wall is that narrow it becomes a post and is rated at zero.

Is there a minimum length for the shear wall section? Using your example, if I use 10d@2" OC and a 24" wall will it support a 1740lb seismic load?

The test showing the stick construction without plywood sheathing was a little biased. There was no lateral bracing on the building, which is what plywood sheathing provides, of course its gonna rock and move. And also, it didnt even look like that sheetrock was fastened to the wall.

And this, ladies and gentlemen, is why American homes only last about a decade.

I wasn’t always clear in the video whether the retrofit added a plywood/osb panel on the inside or outside of the wall. Would welcome that clarity in a reply if you’re able. I came to the conclusion that generally you depicted interior panels, not exterior. In my case I’m residing a house, so I plan to install on the outside if decide to add.

Thanks for the info--for homes that don't have cripple walls--just a wall on top of a rim joist on top of a sill plate, how does one secure holddowns? Do we drill through the sole plate down to the mudsill and foundation, bypassing the rim joist? Also, what's the prescribed retrofit of securing the wall to the rim joist?

Does the spacing between the blockings matter in the design of the shear wall? Say I have 3 rows of 4' x 8' OSB, does it matter that I have 4' - 4' - 2' going up or 4' - 2' - 4' ? I have a feeling that it does.

Your a hack trying to justify your past shoddy work. I wouldnt put my dog in a house with no metal post connections. You need to drop your tool bags and sell oranges on the freeway😂

Imagine eating a very delicious hot soup 🍜 at 5:57

Do you know if these can be used on a CMU foundation?

Is fixing the sinking perimeter walls enough or shall we combine attention on both …. I have the case in my crawlspace , the middle piers are kinda sinking not because the soil is softer there but precisely at the bottom of the perimeter foundation walls sinking or tilting cause of water badly diverted around the house foundation walls on which each end of the main girder is sitting. So the support sinking the girder is kind of sliding out of its place n push down on the piers supporting it in the middle .. question is how do you get the perimeter walls issue fixed … I mean once the job of getting the rain water away from the house ? Please give us some guidance there your video threw all my courage down into the deepest spot of the crawl space

Not helpful at all cause you’re developing above n beyond the wrong done communally done by lots of contractors under guidance of structural engineers but you’re not giving us a clue of how to address failing piers on old houses if not this way … at least if you have it give us an alternative so that we can learn how to address this issue better… thank you

Extremely helpgul Howard. Thank you.

If a rodent can fit in a hole it will certainly try and if it is big enough they will succeed.

This may be a silly question, but is the air gap created by the plastic piping completely open to the outside? Is that gap an entry point for rodents?

Great video 👏

Good idea!

Use extra reverse v support of wood to give more support.

You must experiment in another way. We play with rubber ring, make larger rubber ring same as wood, support the rubber ring from earth to top, put it around wood, then it will not spilte easily. The first floor wood will come on rubber as well as on wood. Make wood home as per as design. Rubber ring will support if ever wood try to fall. Second. Use tyres on ground floor in a zic Zack position use three layers, fill the earth in each layers, tyres will not allow jerking waves to pass. When ever earth quack come, breaking of earth occur in line. Third. If person in poor, they can use tyres for support around wood instead of ring. Fourth. Use rubber sheet below wood. Fifth. Use triangular coupling to support wood. Rubber ring are not available at present in market so use playing rubber ring . Japan faces, land slide,earthquake and tsunami flooding at the same time. Jay bharat.

Just curious what city building code this is?

Maybe the supports were installed for support purposes only and not for seismic retrofitting. A lot of houses that were built a long time ago may require additional support over time. Personally I feel the photos were used out of context to make the video, since the drawings or plans do not mention for seismic activity but they also do not mention for structural support. I would think you need some type of shock absorbers or the house to be on rollers to handle serious seismic activity. Posts or no post are not going to save the house from an earthquake. The perimeter of the house would be more important than the middle when it comes to seismic activity.

I am very please I could help you. Please subscribe.

It is not old growth redwood. You probably have plywood siding which means you don't need to do anything.

My house was built in 1986. Are the studs in that house considered old growth lumber? Wondering if I need to use 3” spacing for my edge nails on my shear wall.

Thank you. This is great information for anyone doing a retrofit.

You are welcome. Be sure to subscribe.

Thank you for this information. I have a soft story and split level house in Pismo Beach.

Thanks for this great info! I am looking at doing a soft story retrofit to a 5 unit building in Oakland. This is was exactly the overview of options I was hoping for!

Hello again. Since I left my thank-you comment 10 days ago I have re-watched this video twice. I was very happy in a couple places to find that when I paused the video & said "that doesn't make sense", you then said the same thing when I started playing it again! Ha-ha. (Also, lining up the vent holes with the foundation bolts is brilliant.) I hope I'm not imposing too much, but I am left with just 2 very basic questions: 1. You've said nothing about OSB, which makes me think that those who extol its virtues may be full of... something; 2. From the 1st diagram @ 2:00 to the one at 22:00, the geometry-center in my brain is wondering if horizontal or vertical orientation of the plywood is significant? My gut says that a horizontal sheet nailed to more studs may be more stable for horizontal shaking. e.g., for simplicity's sake, let's say @ 2:00 there is a vertical 4x8 next to a vertical 3x8... Would 2 horizontal 4x7's be better, worse or indifferent? Many thanks again, Mark

Ive been doing retrofits in Humboldt area since the earthquakes from 2022.. I came into it with zero experience currently we are on our sixth or seventh one... We have a house that fell 4 1/2" to the rear and 4 inches to the right.. it twisted on the cripple wall essentially... We just successfully hoisted in back in place with a series of 4 ton to 3 ton lever hoists and come alongs... Very proud of this achievement!!

Earth's gravitational acceleration g=9.8m/s2 (=980Gal)

What magnitude were these "quakes?" The one in Japan was 9.0? Are these 9.0 magnitude?

You mentioned, "re-bolting the mud sill after an oversized hole" Are you saying that one should cut out the mud sill and repair and re-bolt? Just so we are clear.. thanks.

I hear you state your conclusion that the examples you show are "useless" and a "complete waste of money", but can you include a link or provide the evidence for what you believe is useful?

Sir, you are a generous GENIOUS! 80) I retired from San Rafael, where even Loma Prieta didn't bother us, to Salem Oregon where this Cascadia Subduction Zone dwarfs Hayward & San Andreas... I can't afford a full-blown retrofit downstairs, but I want to fix whatever glaring oversights the building code still had in 2000 when it was built. You have given me SUCH a greater understanding of the cripple-wall improvements that my only remaining question is whether plywood or OSB is superior... Thanx again!

I'm confused! At 5:24 you say 2.25" long nail - but isn't 10d a 3" nail (the red arrow is on the 10d line)? On the one hand, I understand a shorter nail with "Minimum Nail Penetration in Framing" of 1-5/8" but why 10d then?

My house has stucco over the wood siding, is it still good ?

Very usefull material sir greatly appreciated thank you

Outstanding presentation and explanation of how an earthquake attacks a cripple wall and how this weakness is corrected.