Stay out of Rowlett

[Ruffdaddy]

Then the lifting and separation when air is allowed to move under the roof must be caused by another principle.

The upward flow of wind as it hits a broad surface. It is not a simple velocity differential as detailed by the bernoulli effecr creating lift. Again, there will be some lift generated, but that shouldnt be the main concern with this...especially when it comes to an open garage.



The image above is a backside image as impacted by a vortice...the front would have an even greater extent of upward air movement.

Heres a video that explains it in non science terms that may help the window licker rodney.

https://youtu.be/GaSVawZeARU

[68RR]

Frank, and anyone else in the area...I have a couple friends who would like to donate funds but don't want to give to the Red Cross.. Any legit local outfit they can contact that you can recommend??

[Tremor14]

I don't have time to help you ruff,

but here you go smart guy.

[Forever_frost]

I spent a couple of hours in my shelter with these storms because my phone was screaming alerts. I love the thing but the doors do leak a bit when closed. It's far enough from anything substantial where I'm not too concerned about weight on the door but I was looking at the steel rooms at Home Depot that run 5k installed. They bolt directly to your foundation and have slots for fans and TV coax.

[SMKR]

Frank, and anyone else in the area...I have a couple friends who would like to donate funds but don't want to give to the Red Cross.. Any legit local outfit they can contact that you can recommend??

Salvation Army had posts setup

[black2002ls]

you sure have a leisurely amount time to get into a bunker while the tornado sirens are going off.



*cough*

Most houses are built as a rigid structure with the loading coming from the top down (snow load), and not the side loading caused by tornado/hurricane force high winds. So as research has proven, just a minimal amount of lift on the roof will cause the whole structure fail with that side loading. Which is why some of the latest building standards include more specific anchoring methods, and more importantly strapping requirements to keep the roof secured to the walls, an the walls secured to the foundation

To the strapping and anchoring.

I have yet to confirm the level of wind shear that the city of rowlett is using, though I would assume, at the minimum, it is what we are doing in my neighborhood. We are using the 2012 code.

Requirements -

Pour in anchors on each side of all garage doors and at the slab corner on the wall with the garage door

Strap the studs on each side of the garage door from about 10" down the top of the stud, across the garage header, and about 10" above the header

Osb/red(structural) thermal sheething on the garage face, each face of all corners of the house, and every 20' down each side

J bolts in the slab 6" from each corner and IIRC every 6'. Splices in bottom plate must have a bolt within 6" on each side

Hurricane straps on ever other roof rafter.

I have built with much more extensive measures to include internal engineered shear wall designs as well.

With all of that said, in our Rowlett neighborhood. Our model home took extensive damage with almost half of the roof gone (we will more than likely bulldoze the whole thing and start over)

We had frames that were a pile of lumber, and a finished spec home that was turned into a pile of rubble.

I haven't seen the damage in person, only the puctures our builder took, but it makes me wonder, at what point do wind shear measures cease to add any benefit? Also, where else can we make improvements to help these things withstand these events better.

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[juiceweezl]

<------ teaches classes to engineers on wind design and tornado shelters and works for company that makes hurricane ties, straps, etc.


There is a ton of misinformation in this thread on shelters, home construction, building codes, etc. Since I know what happens when you drop actual knowledge on this site, I'll just say PM me if you have legit questions or want to know facts. The video posted is from the IBHS facility in South Carolina and is part of their Fortified House program. The house that failed in the video was built to the code minimum (or to code if you will) for the central US (and the same standard as NTX) which is 90mph wind speeds under the older codes used in this area. The wind speed designation changed under the newest code, but the forces didn't.

Oh, and I don't care what they print on the paper, there is no such thing as structural thermal sheathing. It's cardboard plain and simple. If you read the evaluation report, you see they require gypsum on the other side with nails at something like 4 inches on center.

[black2002ls]

<------ teaches classes to engineers on wind design and tornado shelters and works for company that makes hurricane ties, straps, etc.


There is a ton of misinformation in this thread on shelters, home construction, building codes, etc. Since I know what happens when you drop actual knowledge on this site, I'll just say PM me if you have legit questions or want to know facts. The video posted is from the IBHS facility in South Carolina and is part of their Fortified House program. The house that failed in the video was built to the code minimum (or to code if you will) for the central US (and the same standard as NTX) which is 90mph wind speeds under the older codes used in this area. The wind speed designation changed under the newest code, but the forces didn't.

Oh, and I don't care what they print on the paper, there is no such thing as structural thermal sheathing. It's cardboard plain and simple. If you read the evaluation report, you see they require gypsum on the other side with nails at something like 4 inches on center.

PM in coming

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[SMKR]

[John -- '02 HAWK]

<------ teaches classes to engineers on wind design and tornado shelters and works for company that makes hurricane ties, straps, etc.


There is a ton of misinformation in this thread on shelters, home construction, building codes, etc. Since I know what happens when you drop actual knowledge on this site, I'll just say PM me if you have legit questions or want to know facts. The video posted is from the IBHS facility in South Carolina and is part of their Fortified House program. The house that failed in the video was built to the code minimum (or to code if you will) for the central US (and the same standard as NTX) which is 90mph wind speeds under the older codes used in this area. The wind speed designation changed under the newest code, but the forces didn't.

Oh, and I don't care what they print on the paper, there is no such thing as structural thermal sheathing. It's cardboard plain and simple. If you read the evaluation report, you see they require gypsum on the other side with nails at something like 4 inches on center.

If I'm wrong or mistaken on something post up (unless its grammar then fuck off). I think the 3 people that have posted are all big boys that can handle seeing the information.

[Ruffdaddy]

If I'm wrong or mistaken on something post up (unless its grammar then fuck off). I think the 3 people that have posted are all big boys that can handle seeing the information.

This...im not sure why hes wanting PMs...but being taught something wont hurt my feelings.

[Tremor14]

most likely because you will still pretend to act like you know what you are talking about and use one of the 3 "effects" you like to throw around.

[John -- '02 HAWK]

most likely because you will still pretend to act like you know what you are talking about and use one of the 3 "effects" you like to throw around.

Please take your grudges else where, if you dont have anything meaningful to add

[Tremor14]

PM sent

[Forever_frost]

Has there been anything designed yet that can withstand a F5? I'm thinking if something that powerful hits, it really doesn't matter how well your house is anchored, it's matchsticks.