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Re: Intergrid[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: Intergrid
- From: Joe McCormick <jmccormick(--nospam--at)proaxis.com>
- Date: Wed, 01 Oct 1997 11:22:27 -0700
I'm involved with a similar material currently, and live on the west coast in a Zone 3 area. We're building a high-bay warehouse out of something called RASTRA. They use it all the time in Europe. It's a stay-in-place concrete form that is made of styrofoam like beads coated in concrete, and the mfg calls this "Thastyron" (similar or same as Intergrid?). It has 6.3" diameter cores at 15" o.c. both ways. We designed the building using slender wall design procedures for a given vertical core, and ignored the styrofoam completely. Essentially, this is just a concrete building design. The main problem we ran into was preventing the cores from being over-reinforced while still getting enough strength & stiffness for a relatively slender wall. I think, the material would work very well for residential construction, but to be sure, there is a lot more engineering that is needed compared to a wood framed building. Cost per square foot shipped was around $3.55/sq. ft, and construction is in process and going well. The system accepts a stucco finish directly (which I believe is the normal method of finish), unlike other styrofoam systems I've seen. Electrical and piping can be attatched by cutting out the stryofoam as needed, without too much fuss and I've heard of some people actually running electrical conduit in the cores of the cells too. UC Irvine did some research on this stuff...see report # RAL-20177, November 1996, by Carla Yland and Medhat Haroun. The have a web page at: www.rastra.com. Phone in USA: (888) 727-8721, located in Santa Barbara, CA. Both UL and ICBO have seen this stuff, too. Regards, Joe McCormick At 06:46 PM 9/30/97 -0500, you wrote: >Is anyone familiar with the performance of a CMU-like building material called Intergrid? > >I've got an architect who wants to use it for residential 2-story construction in a >non-seismic area (Texas). From my understanding, Intergrid is made of mortar with >small styrofoam spheres that reduce weight, allow for much larger block sizes and >raise the R value to 38. Rebar is inserted vertically and horizontally and the voids >grouted. > >Any information regarding durability, cost, structural capacity, detailing, ability to >accomodate plumbing and electrical, manufacturer websites or general pitfalls would >be appreciated. > >Thanks, >Dean Van Landuyt, P.E. > > > >
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