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cmkavala
Registered Users
Posts:807
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| 08/14/2008 5:27 PM |
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in 2004 Our former metal SIP supplier had done an excellent job for this informational video, while they are no longer in the residential panel business, it will answer a lot of questions about the "how to's", also shows the deitrich steel joist system being installed
http://portfolio.cmrstudios.com/gallery_corp_work.php?clip=Metals_USA.flv
Thi finished photo looks like this
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Chris Kavala
chris@southernsips.com
1-877-321-SIPS |
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TFreidman
Registered Users
Posts:20
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| 08/15/2008 8:13 AM |
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| How do these homes respond to lightning? |
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cmkavala
Registered Users
Posts:807
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| 08/15/2008 9:36 AM |
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Posted By TFreidman on 08/15/2008 8:13 AM
How do these homes respond to lightning?
TF;
that is a great question and one that is occasionally asked............
Steel built homes are less likely to be damaged by lightning strikes because they have superior grounding characteristics. In fact, a steel frame building provides better protection from lightning than any other type of construction material. This is because the steel frame provides a path to the ground, thus reducing the likelihood of secondary fire, or even personal injury.
as a side note:
A shorted romex wire in steel framing is also not likeley to cause an electrical fire as it would immediately pop the circuit breaker,
where as a shorted wire in a wood frame assembly could continue to arc until the wood catches fire
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Chris Kavala
chris@southernsips.com
1-877-321-SIPS |
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Donaldson Woody
Registered Users
Posts:3
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| 08/15/2008 9:38 AM |
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Posted By TFreidman on 08/15/2008 8:13 AM
How do these homes respond to lightning?
TFreidman,
Lightning proof is a good description. As is the case with any metal
structure such as a car, or plane, the metal sip is your safest place to be in
a lightning storm. You are safe in you car not because as is commonly
believed you have rubber tires, but because you are surrounded be
metal. A lightning rod is not there to attract lightning but
to make a way for the structure to release the build up of ions that naturally accrue.
Ion build up is what attracts lightning. Also as is the case with an
airplane or I have even seen demonstrations with a suit of armor, lightening
will go around the outside circumference of any metal structure and dissipate
into the ground. If properly grounded you have a greater chance of no damage
what so ever in a steel sip structure than you do with any other type of construction, should a lightning strike ever happen.
CKavala nice video, is there anyway isolate and download the video,
I think it shows in a few minutes a wealth of info.
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rnortman
Registered Users
Posts:94
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| 08/15/2008 10:01 AM |
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I would add that the only way lightning would hop off of a metal structure (stud or SIPs skin) and go through air, wood, or flesh instead would be if the metal were not grounded, and the other material provided the necessary path to ground. So if there is a break between two metal members and you happen to be spanning that break (touching both at once), the current will flow through you. A piece of wood could also provide the bridge, likely leading to a fire.
However, none of this makes metal any worse than wood construction, and in fact whatever breaks there are in a metal structre between the metal members and ground are likely small enough gaps that the path of least resistance will be the air between the members. If you really care, make sure that metal fasteners connect the entire metal frame into a singly connected structure all the way to ground. You can even add a grounding lug at the bottom to ensure a good connection. Of course, by doing that you will also be creating what's called a "Faraday cage", which will pretty effectively block radio signals (including your cell phone). Unless you are paranoid that the high voltage power lines and cell towers are giving you cancer, or that the CIA is reading your brain waves with spy satellites, you probably would rather be able to get a cell signal in your house. So don't try too hard to ground the metal skin. Studs are not spaced closely enough to create a faraday cage; you need a solid skin or fine metal mesh to create a Faraday cage, and it has to have a good ground connection. Anything less will attenuate but not completely block radio signals.
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cmkavala
Registered Users
Posts:807
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| 08/15/2008 10:08 AM |
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| When the meter can and breaker panel are attached to the steel building it is automatically grounded with the electrical system |
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Chris Kavala
chris@southernsips.com
1-877-321-SIPS |
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TFreidman
Registered Users
Posts:20
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| 08/23/2008 3:52 PM |
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Posted By cmkavala on 08/14/2008 5:27 PM
in 2004 Our former metal SIP supplier had done an excellent job for this informational video, while they are no longer in the residential panel business, it will answer a lot of questions about the "how to's", also shows the deitrich steel joist system being installed
http://portfolio.cmrstudios.com/gallery_corp_work.php?clip=Metals_USA.flv
Thi finished photo looks like this
looks like a northern home? |
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