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RE: Insulrock diaphragm[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: RE: Insulrock diaphragm
- From: "Harold Sprague" <spraguehope(--nospam--at)hotmail.com>
- Date: Mon, 03 Jan 2005 19:27:45 +0000
Tectum was a bit different. Tectum like Fibroplank and Permadeck is structural wood product that was used a lot in gymnasiums to control sound. It also was designed to bear on bulb / truss tees.
The term Insulrock is new to me, but the "rock" portion would indicate that it is a gypsum base product.
I would suggest that you connect with: http://www.nrca.net/about/ or http://www.professionalroofing.netMost assemblies (as this one) were UL rated, and UL is product specific. A lot of roof assemblies were FM rated, and FM is another good source, and they might have the diaphragm data.
There was another US Gypsum called "Span-Rock Gypsum Roof Planks". They were factory laminated gypsum board planks that were supported by bulb / truss tee's.
The installers generally hold a gap at the bulb / truss tee's and the space was grouted with gypsum. This was done for Permadeck and Tectum as well. This is how the diaphragm resistance was developed.
Regards, Harold Sprague
From: "Joe Grill" <jgrill(--nospam--at)swiaz.com> Reply-To: <seaint(--nospam--at)seaint.org> To: <seaint(--nospam--at)seaint.org> Subject: RE: Insulrock diaphragm Date: Mon, 3 Jan 2005 11:25:39 -0700 Will, Several years ago I looked at an old building with a roof system that wasreferred to as (IIRC)a "Tectum" system, which sounds similar to what you aredescribing. But, as Harold stated there were probably a number of manufacturers. I seems as though I was able to find some information doing a search for "Tectum Roofing". Sorry, but what I had is still with an old employer. Hope this helps. J.Grill Joseph R. Grill, P.E. (Structural) Shephard - Wesnitzer, Inc. Civil Engineering and Surveying 1146 W. Hwy 89A Suite B Sedona, AZ 86340 PHONE (928) 282-1061 FAX (928) 282-2058 jgrill(--nospam--at)swiaz.com -----Original Message----- From: Will H [mailto:haynewp(--nospam--at)hotmail.com] Sent: Monday, January 03, 2005 11:17 AM To: seaint(--nospam--at)seaint.org Subject: RE: Insulrock diaphragm Thanks Harold, I can't find any mention of the gypsum concrete on the drawings. They are showing the 2 1/2" form boards with built up roofing directly on top of them. So it looks like it could not be justified as a diaphragm. Will Haynes, P.E. >From: "Harold Sprague" <spraguehope(--nospam--at)hotmail.com> >Reply-To: <seaint(--nospam--at)seaint.org> >To: seaint(--nospam--at)seaint.org >Subject: RE: Insulrock diaphragm >Date: Mon, 03 Jan 2005 17:55:20 +0000 > >Will, > >This appears to be a gypsum roof deck system. There were many>manufacturers of gypsum systems in the 1960's. The particular system that>was used varied region to region. My advice would be to find an old ICBO >Research Report on Insulrock. I have an old US Gypsum Research Report on >Thermofill and Pyrofill. Generally the gypsum formboards were just there>to support the cast in place gypsum, and contributed little to the strength>of the diaphragm system. What you are referring to were often called "form>boards". The sequence of construction for the gypsum structural deck >consisted of: >1. The bulb tee or truss tee's were welded to the structural steel >2. The form boards were placed on the bulb / truss tees (The form boards >were held back from the tees to allow the cast in place gypsum to flow >around the exposed portion of the tee's) >3. Wire mesh was placed on the form board and tee's. >4. Gypsum concrete was placed on the deck system. >>The system worked pretty well unless you got a leak in the roofing system.> >Allowable shear loads ranged from 510 to 1200 pounds per lineal foot. > >Regards, >Harold Sprague > > > > >>From: "Will H" <haynewp(--nospam--at)hotmail.com> >>Reply-To: <seaint(--nospam--at)seaint.org> >>To: seaint(--nospam--at)seaint.org >>Subject: Insulrock diaphragm >>Date: Mon, 03 Jan 2005 10:22:49 -0500 >> >>I have an existing building from the 1960's that used Insulrock roof >>panels on bulb tee purlins. I don't see how this can be considered a>>structural diaphragm, but it is the only thing that has been distributing>>the lateral loads on the building for 40 years. >> >>Does anyone have any experience with this product? By looking at the >>document below, I think the planks are only resting on the tees and >>clipped to the main steel beams but the drawings don't specify. >> >>http://www.rci-mercury.com/files/ab071226.pdf >> >> >>thanks for any help >> >> >> >>Will Haynes, P.E. >>
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