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rnortman Registered Users
Posts:97

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| 08/31/2008 8:43 AM |
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There's been a rash of different folks posting recently about various different wall panel systems based on a cold-rolled steel stud frame with integral EPS foam. They like to call these things SIPs, but they're clearly a completely different thing than what the term usually refers to (stressed skin insulated panels). I can see that one might have reasons for choosing one or the other -- I'm not debating the merits. I'm wondering if we should be crying foul when they apply the name "SIP" to their systems. Any thoughts, preferrably from neutral parties?
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EPSFOAMCENTER Registered Users
Posts:18

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| 08/31/2008 8:58 AM |
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There is a whole history of SIP on the link below. It includes the following: "SIPs are most commonly made of OSB panels sandwiched around a foam core made of expanded polystyrene (EPS), extruded polystyrene (XPS) or rigid polyurethane foam, but other materials can be used, such as plywood, pressure-treated plywood for below-grade foundation walls, steel, aluminum, cementitious panels, and even exotic materials like stainless steel, fiber-reinforced plastic, and Magnesium Oxide. Some SIPs use fiber-cement or plywood for the panels, and agricultural fiber, such as wheat straw, for the core." -Wikipedia
http://en.wikipedia.org/wiki/Structural_Insulated_Panels
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cmkavala Registered Users
Posts:818


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| 08/31/2008 9:22 AM |
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rnortman;
I agree that the stud/foam sytstems are not trully SIPs, I also doubt that they can make the same claim that they are 3 x stronger than frame ...................... because they are frame!
They are "panelized" wall sections, nothing new with that technology, it simply saves construction time/labor. But cannot match the structural integrity that a true SIP system brings to the table.
Maybe the GBT forum will give then their own special titled section to peddle their antiquated technology |
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Chris Kavala chris@southernsips.com 1-877-321-SIPS |
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Matt Phelps Registered Users
Posts:26

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| 08/31/2008 9:58 AM |
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Steel stud or skin, that is the question? I know that at least one steel stud with autoclaved EPS foam manufacture have been invited to join the Structural Insulated Panel Association (SIPA). I regret to report that this particular manufacture has chosen to NOT join SIPA. The reason they choose to NOT join SIPA was that they felt that SIPA represents the traditional skin type SIP manufactures, and that they were not a member of that community of manufactures. I hope they will revisit this decision and reconsider their choice. So, apparently SIPA considers steel stud panels with autoclaved EPS foam between the studs (and through the voids in the studs) to be SIPS; although, the manufacture apparently may or may not.
I understand SIPs are sometimes referred to as sandwich panels, stressed skin, and other names that imply that the structural potency comes from the external, rather than internal elements. And I must agree that in the hundreds of SIPs we have tested in our structural testing lab, steel studs are the only type that have derived their structural integrity from internal, rather than external elements.
Matt B. Phelps, P.E., R.S. mphelps@apec-llc.com 512/670-9400 |
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rnortman Registered Users
Posts:97

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| 08/31/2008 11:49 AM |
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Posted By EPSFOAMCENTER on 08/31/2008 8:58 AM There is a whole history of SIP on the link below. It includes the following: "SIPs are most commonly made of OSB panels sandwiched around a foam core made of expanded polystyrene (EPS), extruded polystyrene (XPS) or rigid polyurethane foam, but other materials can be used, such as plywood, pressure-treated plywood for below-grade foundation walls, steel, aluminum, cementitious panels, and even exotic materials like stainless steel, fiber-reinforced plastic, and Magnesium Oxide. Some SIPs use fiber-cement or plywood for the panels, and agricultural fiber, such as wheat straw, for the core." -Wikipedia
http://en.wikipedia.org/wiki/Structural_Insulated_Panels
What you have quoted above implies that the stick-framed versions are NOT SIPs. The above text is saying that you can use a variety of materials for the outer skins and also different foams for the internal insulation, but that a SIP consists of an insulating foam core bonded to two external structural skins. The defining characteristic of SIPs is their sandwich structure, not the materials used. The type of panel make with internal framing members would not qualify due to its completely different internal structure.
Wikipedia, however, should never be used as an authoritative source, and there isn't really an authoritative source for this question because there's no one entity charged with defining SIPs. On the other hand, weren't SIPs just added to the IRC recently? How do they define them?
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ReadyToRetire Registered Users
Posts:195

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| 08/31/2008 7:17 PM |
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I'd thought that SIPs were "structural insulating panels." But, either way, I'd not consider those stud/foam panel products as SIPs. If they are SIPs, then any post and beam structure would also seem to be SIPs regardless of what was used to in-fill.
It's not a merits issue, merely terminolgy, but the term "SIP" does not seem to fit them.
Very respectfully, Larry
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rnortman Registered Users
Posts:97

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| 09/01/2008 9:06 AM |
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Matt Phelps,
No offense, but do you mean to be posting the same thing three times? Are you not seeing your own posts showing up? I saw your post and I find it interesting information indeed that SIPA invited a stud panel manufacturer to join. Even more interesting that they refused on the basis that they did not feel any commonality with the current SIPA members. But I don't think that information puts the question to bed. To the contrary, you could draw either conclusion from that.
My personal thought is that the more general a name is, the more potential for confusion there is. We already have a way of talking about panelized wall systems. We can call them, for example, "panelized wall systems", which would include traditional SIPs and also stud-based insulated panels. If we start including the stud systems under the term "SIP", we have lost our way of talking about stressed-skin SIPs, and opened up the potential for lots of confusion. But we haven't gained anything, except for the ability of a stud-based manufacturer to snag SIPs shoppers and convert them to stud-based panels.
Maybe the stud-based panel industry needs to come up with their own acronym that they all use, which will help shoppers find them as easily as they can currently find SIPs manufacturers. Maybe then they can even get their own forum on sites like this.
BTW, I have absolutely zero commercial interest in one system or the other. I am following both systems and find each to have its own advantages and disadvantages. But I do have an interest in keeping the conversation clean and understandable, and using the right terminology is important to that.
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Matt Phelps Registered Users
Posts:26

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| 09/01/2008 10:27 AM |
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Thank you, I could not see the post and did not think it was being posted for some reason. Allway nice to hear comments from a novice.
Thanks! |
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Alton Registered Users
Posts:314

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| 09/01/2008 10:43 AM |
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By the way, a user of this forum can edit their posting but can not delete it. Only the forum moderator can delete a posting. I am not aware of the correct procedure in having the moderator to delete a posting. Does anyone know? |
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Alton C. Keown Residential Designer and Construction Technology Consultant Auburn, Alabama 334 329-0957 AT&T Cellular |
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WannaBe Registered Users
Posts:3

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| 09/02/2008 1:27 PM |
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Nortman,
Simple answer from me... Yes.
Maybe there needs to be a way to break down the types of SIP's. SSIP - Skin Structural Insulated Panels, MSIP - Metal Skinned Insulated Panels, StSIP - Stud based Structural Insulated Panels. (I don't think so... just something to think about, this would be very confusing.)
As a person who wants my next house to be Energy Efficient and wants an easy way to be able to research my options, SIPS should include ALL Structural Insulated Panels. I would not expect this to include structral panels that are not energy efficient.
By excluding any type of a "super" insulated panel, a person might choose to use conventional framing and not take advantage of super insulating a structure due to lack of knowledge, knowledge of local availabilty of products (is this not a key point to Green Building?), the ability to find qualified building professionals, and probably many other deciding factors on which product to use.
What is needed is information. This is the only place that I have been able to find that provides the knowledge / debate on the different building systems that are out there. Two good examles of this is the debate between metal / wood skinned SIPS and the use of EPS/Urathane insulation. In order for a (potential) owner/builder to gain as much information as possible about energy efficient building, it is better to include than to exclude. I find that it is good to get outside of the manufactures propaganda of why they are the only product to use and to find out what options are available. I like to look for the reasons why something is bad, is there a qualifing reason for the critism or is it a vague statement like "oh, it just doesn't work". I like when people question statements that are vague but may not seam like it is vague. From cmkavala "I agree that the stud/foam sytstems are not trully SIPs, I also doubt that they can make the same claim that they are 3 x stronger than frame ...................... because they are frame!", he points out the vagueness of the statement, even though his statment is vague in return. It gives me something to think about while I look at different SIP systems. If strenght was a key factor for me based on Chris's statement I would almost have to ask what would be wrong with just glueing metal to the outside of any structure to make it stronger? (notice I said almost)
By reading this site and other sites I have excluded one foundation system already due to the appearent unwillingness of the "Home" company to step in when the franchisee does not step up to the plate.
Instead of being afraid of the "other" SIP's, bring them in, make them prove themselves. If they are successful, learn to be better at what you do, if they can't, still learn to be better at what you do. At my last job (computers) I did not operate on the belief that if it is not broken don't fix it but on the principle of " If it is not broke, what can we do to make it better." In the case of this site that would have to be, Being Greener.
Thanks for letting me speak my mind. Kurt |
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jusaxeme Registered Users
Posts:13

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| 09/02/2008 8:23 PM |
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SIP= Structural Insulated Panel Is this system structural?/ YES Is it insulated YES Is it a panel system YES There, that was not so hard was it.
If you are just looking for a monopoly on systems that are better than stick built and do not want others to get onboard then consider changing to a more "exclusive" name. Carl Sandburg when asked why such a learned man spoke like a sailor remarked that the only obscene word in the English lanquage is the word "Exclusive" Welcome all who are trying to do better systems than the cavity wall sytems which are the root of most problems with buildings in America.
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ReadyToRetire Registered Users
Posts:195

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| 09/02/2008 8:38 PM |
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I think that you've exactly identified the reason why I would refuse to consider them SIPs: their "system" is structural, the panel is not; their structure is not insulating, the foam is. There are many quality ways to build. This system may -- or may not -- be a quality system. But it does not use SIPs.
Very respectfully, Larry
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jusaxeme Registered Users
Posts:13

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| 09/02/2008 8:44 PM |
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I agree it does not use stress skin dynamics. My only real point--other than the "toungue-in-cheek" ones Is that , if that is what is important to some who take exception to this system then maybe a more closely defining name is in order.
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rnortman Registered Users
Posts:97

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| 09/03/2008 8:14 AM |
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I'd like to say again that I'm not criticising these systems. They are quite interesting to me, in fact. But the biggest challenge faced by alternative technologies is education of the general population as well as design and construction pros. If you confuse your terminology, you confuse those people. For example, if somebody hears that SIPs can suffer from delamination, and you call these stud-based systems SIPs, then suddenly people are going to think that they suffer from delamination as well, not really understanding what that even means. And if somebody hears that these stud-based systems have problems with thermal bridging, well, suddenly all SIPs suffer from thermal bridging. People don't bother to understand details. They lump things together under labels and then generalize to everything with the same label.
And even before you get to the details, how do you answer the question of "What is a SIP?" to a newbie? Now suddenly you have to say, well, there are really several different basic kinds. They can have internal structural elements, or they can have exterior structural skins. By that time you've lost your audience, and they're already at the lumber yard buying their 2x lumber for their next house.
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PanelCrafters Registered Users
Posts:1329


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| 09/03/2008 9:02 AM |
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I posted this in another thread:
SIPs 101 A SIP by any other name… By Frank Baker
It’s time for a pop quiz. A structural insulated panel is? 1. A Sandwich panel 2. A Stress-Skin 3. A Foam Core Panel 4. A Curtain Wall Panel 5. Insulated 6. Not insulated 7. Structural 8. Non-structural 9. All of the above 10. None of the above 11. Some of the above
Is a “sandwich panel” an SIP? Today’s SIP is most commonly known as a laminate of oriented strand board (OSB) skins and rigid plastic foam core insulation. This type of panel, correctly referred to as a sandwich panel, is certainly an SIP. Answer: Yes, always.
Is a stressed-skin panel an SIP? If the stressed-skin panel does not contain insulation, it could not be correctly referred to as a structural insulated panel, but only as a structural panel or SP. If it were insulated with fiberglass or foam, it could be correctly referred to as an SIP. Answer: No in most cases, but yes in some.
Is a foam core panel an sip? Foam core panel is a nonspecific term in reference to the building codes. It has commonly been used in describing a sandwich panel, but confuses the purer definitions APA established years ago. Strictly speaking, a stressed-skin panel could be insulated with rigid foam. If this were done, would it then qualify as a foam core panel? In my opinion, this term should be discarded. Answer: Yes, but let’s not use the term again.
Is an SIP structural? By their nature SIPs are structural. They are intended to carry loads.
Are SIPs curtain wall panels? SIPs attached to timber framing are sometimes referred to as curtain wall panels because they close these structures with a curtain-like effect. This is a poor way to refer to an SIP, however, since it implies it’s as insubstantial as a curtain. We expect and need the SIPs used in these applications to be rigid structural members, resisting wind loads and snow loads, and contributing significant racking diaphragm stiffness to the structural framework. Answer: Yes, always, but let’s avoid the term.
Is an SIP non-structural? Answer: Never.
I hope this will help us all in the industry to better understand the terms we use, avoid confusion in the marketplace and maybe even avoid liability.
Frank Baker is CEO of Insulspan.
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....jc If you're not building with OSB SIPS(or ICF's), why are you building? |
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ergodesk Registered Users
Posts:31


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| 09/03/2008 9:01 PM |
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In Europe they build structures from foamed cement.
A material with better insulating properties and similar structural properties is GeoFoam.
GeoFoam is a EPS foam with a compressive weight of over 2 pounds per cubic foot. This GeoFoam theoretically should be all the structure tat is required even in high snow load areas without any structural skins attached.
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Build Smarter with Structural Insulated Air http://StyroHomeNews.blogspot.com |
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Jelly Registered Users
Posts:273

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| 09/05/2008 9:40 AM |
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| jusaxeme, I'm not trying to be abrasive, but by your criteria 2x4 studs with OSB sheathing and fiberglass batts could practically be called SIPS. |
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jusaxeme Registered Users
Posts:13

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| 09/05/2008 7:35 PM |
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Jelly, I agree with what you have observed. I do not like that it seems to include them but my main point was that the name allows for it. I was a young builder (of firewood houses as I did not know any better at the time) when blandx--later OSB--started being foisted upon the unsuspecting market. I remember when I first was exposed to stress skin dynamics (sandwich panel, SIP, etc) and watched as the name was settled on. SIP was settled upon and now others are overlapping into the area. My main point was that, as the name stands, it seems that it does allow for these "intruders" As a wiser man than me said, "Words mean things." |
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