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#177873 - 07/28/09 12:17 AM Retrofitting my house for tornado shelter?
Blast Offline
INTERCEPTOR
Carpal Tunnel

Registered: 07/15/02
Posts: 3487
Loc: Spring, Texas
In light of recent tornado posts I've been thinking about my house. Currently our storm room is the downstairs powder room but I'm wondering if we could somehow add a storm celler somehow. Being in Houston, we have no basement. Our house sits on a post-tension cable concrete slab. Is it possible to cut through such a slab and dig a shelter below it?

That would be really cool.

-Blast
_________________________
Blogging the Borderlands
Wild Edibles Blog
I miss OBG.

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#177877 - 07/28/09 12:43 AM Re: Retrofitting my house for tornado shelter? [Re: Blast]
Todd W Offline
Product Tester
Pooh-Bah

Registered: 11/14/04
Posts: 1928
Loc: Mountains of CA
Hey Blast, what about a storm shelter in the backyard? Probably cheaper to dig out, and install a pre-made shelter... ? Or even do one of the home made ones with the concrete rooms?
_________________________
Self Sufficient Home - Our journey to self sufficiency.

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#177881 - 07/28/09 12:46 AM Re: Retrofitting my house for tornado shelter? [Re: Blast]
barbakane Offline
Member

Registered: 03/12/09
Posts: 164
Loc: Florida
Seems it would be easier to build an underground shelter ten feet from the house, then add an enclosed hallway/anteroom that leads from the house to the shelter, with a reinforced doorway at both ends. Just build a shelter, sink it, reinforce it, then enclose entry. Like the fallout shelters from the 50's/60's, or "Saferoom".
_________________________
seeking to balance risk and reward
Audaces fortuna iuvat...fortune favors the bold
Practice methodical caution...Les Stroud

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#177882 - 07/28/09 12:55 AM Re: Retrofitting my house for tornado shelter? [Re: Blast]
philip Offline
Addict

Registered: 09/19/05
Posts: 639
Loc: San Francisco Bay Area
> Our house sits on a post-tension cable concrete slab. Is it possible to cut
> through such a slab and dig a shelter below it?

No. We've got the same kind of slab, and our condo association documents provide this warning:
"Each residential structure in the Development has been constructed on a post-tension concrete slab. This slab is approximately 12 inches thick and contains stressed steel cables. Any drilling, excavating or other disturbance of the slab could damage the slab and cables and could result in serious injury. If damaged, the slab will not function as designed."

Where's the water table in Houston? How far down do you dig before you hit water?

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#177883 - 07/28/09 01:06 AM Re: Retrofitting my house for tornado shelter? [Re: philip]
Blast Offline
INTERCEPTOR
Carpal Tunnel

Registered: 07/15/02
Posts: 3487
Loc: Spring, Texas
I wanted something inside the house rather than having to run through the storm to the shelter. The water table is around 5' deep, maybe a little less here depending on recent rains, hence no basements.

Oh well, one more reason my next home will be a monolithic dome.
-Blast

_________________________
Blogging the Borderlands
Wild Edibles Blog
I miss OBG.

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#177884 - 07/28/09 01:13 AM Re: Retrofitting my house for tornado shelter? [Re: Blast]
IzzyJG99 Offline
Geezer

Registered: 02/05/05
Posts: 5029
Originally Posted By: Blast
I wanted something inside the house rather than having to run through the storm to the shelter. The water table is around 5' deep, maybe a little less here depending on recent rains, hence no basements.

Oh well, one more reason my next home will be a monolithic dome.
-Blast



There are many companies around that retrofit rooms to be tornado save. More or less they rip the room down to the studs. They install a form and put in concrete forming a concrete box within the house. It's very costly. Something like 50,000+.
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#177885 - 07/28/09 01:14 AM Re: Retrofitting my house for tornado shelter? [Re: Blast]
MoBOB Offline
Old Hand

Registered: 09/17/07
Posts: 1131
Loc: here
Originally Posted By: Blast

Oh well, one more reason my next home will be a monolithic dome.
-Blast
Exactly!! Go to Italy, TX this October when they have their open house. You'll love it. I've done it twice. I also have drawn a few plans myself.

Standard Disclaimer
_________________________
"Its not a matter of being ready as it is being prepared" -- B. E. J. Taylor

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#177890 - 07/28/09 01:44 AM Re: Retrofitting my house for tornado shelter? [Re: MoBOB]
Todd W Offline
Product Tester
Pooh-Bah

Registered: 11/14/04
Posts: 1928
Loc: Mountains of CA
5' water table, wow you are lucky!

_________________________
Self Sufficient Home - Our journey to self sufficiency.

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#177893 - 07/28/09 02:15 AM Re: Retrofitting my house for tornado shelter? [Re: Blast]
Desperado Offline
Veteran

Registered: 11/01/08
Posts: 1516
Loc: DFW, Texas
Originally Posted By: Blast
I wanted something inside the house rather than having to run through the storm to the shelter. The water table is around 5' deep, maybe a little less here depending on recent rains, hence no basements.

Oh well, one more reason my next home will be a monolithic dome.
-Blast



We need to talk. PM me tonight or tomorrow.

In the mean time, please do not cut your foundation. Hit a cable, and there is a good chance someone dies.

Imagine the pull string at the top of a dry cat food bag. Now imagine the cable is the string under 30,000 psi. Not a pretty site. Doesn't alway happen, but I have been there when it does.

You can trust me, I am you friendly Licensed Homebuilder in Texas.
_________________________
I do the things that I must, and really regret, are unfortunately necessary.

RIP OBG

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#177895 - 07/28/09 03:47 AM Re: Retrofitting my house for tornado shelter? [Re: Blast]
jaywalke Offline
Member

Registered: 12/22/07
Posts: 172
Loc: Appalachian mountains
Easy . . . Don't live in Texas. :-]

I know, I know, not helpful.

If you can't cut your slab, what about one of these right outside the back door? With the berm, it doesn't look deeper than 5'.

http://www.bargerandsons.com/storm-shelter/storm-shelter.html




Edited by jaywalke (07/28/09 10:23 AM)

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