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richntiff
Registered Users
Basic Member
Posts:111
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| 01/29/2009 10:05 AM |
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| Thanks for that Simon - what is the wood piece located just to the right of the failure zone? Is it a spline? |
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SimonD
Registered Users
New Member
Posts:94
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| 01/30/2009 8:48 PM |
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Not sure why the testing company put that wood blocking in, It isn't part of the panels interlock. I wasn't there for the test, but I would call 'foul' because that piece of wood looks like it may have caused the panel to fail sooner.
Having been involved on the manuf. side of SIPs and having sent my former companies panels out for testing, I am not so trusting of these independant testing labs. Sometimes they assemble a panel into a testing machine with little modifications to suit their needs and don't seem to fully be aware or care how it may skew the outcome of the test.
I do recall on some tests that the panels were so strong that they couldn't take the panel to failure, but stopped the test after a certain deflection was achieved. Their test equipment wasn't strong enough to break some panels, which I thought wasn't a fair test, but oh well. |
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Building Designer
PANELfusion, LLC, Tampa, FL
simon@panelfusion(dot com)
"Metal SIP Advocate" |
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richntiff
Registered Users
Basic Member
Posts:111
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| 01/31/2009 12:30 PM |
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Simon,
That's why I asked the question. It's quite clear from that picture that the wood piece caused a stress riser at that point in the steel skin. I would have cried foul! |
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SimonD
Registered Users
New Member
Posts:94
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| 01/31/2009 5:23 PM |
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Off topic again, but I know engineers like hard figures. Found the axial test summary and I think you will find the results are quite impressive for just some foam, glue and sheet metal sandwiched together.
My loose summary of the summary is that in the case of the steel skin panel each linear foot of panel held about 3000 lbs, so a 3ft wide by 8ft tall panel was holding about 9,000 lbs, which is basically the weight of 2 small cars.
(The 4" Alum skewed the figures because of a bad panel, so I guess thats why we need the safety factors...) |
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Building Designer
PANELfusion, LLC, Tampa, FL
simon@panelfusion(dot com)
"Metal SIP Advocate" |
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Gawainm
Registered Users
New Member
Posts:2
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| 02/03/2009 7:07 AM |
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| I'm a little late jumping in on this one. Have you considered using Polyurethane SIPS? If you're going for a super insulated structure, and panel thickness is an issue, you get far more R-Value per inch. I have installed both EPS and Polyurethane, and find the poly ones to be better quality. |
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GreenBuilder, SIPS installer
SmartBuilders, Inc
Gawain@thesmartbuilders.com
828-252-4345
www.thesmartbuilders.com |
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