Giff
Registered Users
Posts:2
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| 10/15/2000 8:37 PM |
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I read with some interest the post of keith on 22 sept. inquiring if it was necessary to drywall the interior of a sips home. It seems to me that you could either coat the osb with the same product that R control uses then using a plaster weld primer and then just plaster over the whole space mesh taping the corners and seems. I'm currently experimenting with such a technique.
And yes I know that platerers will say it wont work. But seems to me worth trying as installed sheetrock tape and texture is running about $1.20-$1.30 a sq. ft. where I live. So it seems to me there is a little money to be saved, less waste, and in my case one less sub to have to schedule for.
Any thoughts out there
Gifford
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ICF501
Registered Users
Posts:109
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| 10/16/2000 12:34 AM |
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I agree in principle with what you say. I believe that it may have much to do with codes and the panel mfg warranty. The R-Control product was tested to ASTM standards to warrant the necessary fire codes so the product could be marketed to uphold the UBC and most other local codes. Doing what you say may work quite well, but you may be called upon to prove it. The fire coating process requires a substantial amount of nailing and screwing and tapeing. There would be nothing better to have a finished interior panel that met all structural, fire, and safty issues, the UBC puts forth. Maybe they are necessary and pehaps common sense could prevail in some cases, but I doubt the manufacturer would uphold your claim in the case of a fire.
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ICF869
Registered Users
Posts:3
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| 10/16/2000 10:54 AM |
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About two years ago I heard a panel maker describe a new panel that had OSB on one face and on the other, instead of OSB, it had a sheet of "structural drywall". So you wouldn't have to put wallboard on the inside face. Has anyone ever heard of this? Used it? How did it work?
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cmkavala
Registered Users
Posts:818
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| 10/16/2000 4:19 PM |
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Most codes require a minimum of 1/2" drywall for a min. 20minute fire resistance---if your local inspector enforces it?
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Chris Kavala
chris@southernsips.com
1-877-321-SIPS |
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ICF501
Registered Users
Posts:109
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| 10/16/2000 11:50 PM |
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A panel with sheetrock on one side as a stress skin will not be structural. These are sometimes called curtain wall panels and can be used where the panel itself is not structural. A lot of timber framers use this type of panel.
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ICF869
Registered Users
Posts:3
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| 10/17/2000 9:47 AM |
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Ed: I believe the panel described had special drywall, fiberglass-reinforced or some such. Does that make sense.
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mitchemr
Registered Users
Posts:1
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| 10/18/2000 8:05 AM |
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Pieter, I have built 3 homes using a panel with osb on the outside, EPS center and fiberbond sheetrock on the inside. They are structural and were used on all exterior walls. They came in 4 x 8's only (took more time). They worked well when framer understood how to assemble them. Made by ACS in Richmond Va. 804-378-3742
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Steve Andrews
Registered Users
Posts:334
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| 10/18/2000 1:54 PM |
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What was the cost difference for the fiberbond-faced panels? How much did they cost compared to conventional double-OSB-faced panels? More importantly, the 4'x8' size notwithstanding, did you have a significant net overall savings by not having to purchase and schedule hanging rock separately?
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ICF512
Registered Users
Posts:9
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| 10/19/2000 12:50 AM |
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Ok kids, if you build and are subject to inspection it is a must to have drywall. I have to confess I did build a small unit that we web taped the joints and stain locked sealed the osb. and shot clear lacquer over that textured it and it was a great surface. There are numberous companies now offering thin sheeted interior finishes that can be applied over osb. Check with automated builder or professional builders magazing and you should find what you want with fire rating.
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ICF501
Registered Users
Posts:109
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| 10/19/2000 10:32 PM |
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Ok I am not an engineer but the way I was told a "Structural Insulated Panel" gets its strenght is by having tow opposing skins react to each othe in opposite ways to give it strenght. This is the stressed skin. You can envision this best by visulizing an I=beam whether it be steel or wood. The top and bottom chords are of the same material,. When a panel is placed on a roof for instance, the top chord has a need to compress while the bottom skin needs to expand. Tension and Compression. If skins are of different materials they will not react to loading equaly. I would not doubt that the weakest skin would be the governing parameter to determine loads, but they will not be equal. i do not know of a test for determining load capacities that uses different skins that is approved by a code agency. If you know of one let me know.
To sum it up you may have a panel that is load bearing, but it is not an approved application subject to any ICBO, BOCA or SBCCI specs. This would not preclude and engineer providing interpolated values for such an application, but until then I would consider these to be non-structural panels and would use supports within the panel itself for transvers load etc.
Ed Stahl
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Steve Andrews
Registered Users
Posts:334
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| 10/19/2000 11:04 PM |
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Ed, I believe W.H.Porter and Fischer SIPs experimented extensively during the early/mid 1990s with panels that included these two different facings: fiberbond drywall on one side and OSB on the other. Those panels were supposed to carry all loads, though I can't tell you any of the engineering details and I'm skeptical if they ever initiated a listing process through one of the code bodies. I'll see if I can get them to comment on their experience. Thanks for your comments throughout the recent posts.
Steve
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ICF501
Registered Users
Posts:109
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| 10/23/2000 12:59 AM |
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STeve
I have only heard of Insulspan trying Fibre bond panels. I was told they were ok for single story (8ft.) loading and needed more beefing up for header use. Transverse loading seemed to be the main problem. At Bantex we pressed panels with and EPS core and cementious skins which also withstood vertical loading to a degree. We never calc'd the lbs./ft/2 but the panels crumbled when sandwiched vertically in the press.
Ed
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