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On-Demand-Construction for the Instant Gratification Generation

Posted December 10, 2010 7:00 AM

The globe has gone crazy for "on-demand." We now watch on-demand television programs and read print-on-demand books. We've become an "instant gratification" generation that lusts texting, I.M.'ing, emailing, and more. Even driving to the video store takes too much time now since we can download our movies right from the computer. Remember the vinyl record? Remember cassette tapes? Remember CDs? They're gone now. Instant music downloads have replaced them.

A similar phenomenon is happening in the commercial construction arena. Conventional construction techniques are giving over to on-demand-construction in which structures are prefabricated into sections which are then packed into shipping containers that are then transported to a construction site. Now construction crews are able to put together a building in a matter of weeks or even days, rather than months or years.

The green advantage to this type of speedy construction? Less field time means less energy expended. Also, the materials that go into the prefabricated sections can be better controlled, and that's good for sustainable and LEED-certified building practices.

But there's another advantage to on-demand-construction: Construction savings.

Says Brian Phillips, a LEED AP and principal at Interface Studio Architects, who recently constructed an 80,000 sq.ft, 5-story, 72-unit, modular student housing complex for Philadelphia's Temple University, "The ability to fabricate elements of the building outside of Philadelphia County allows for a more competitive labor rate. Also, if time is money - the speed of modular is a savings."

While construction-on-demand presents an exciting and money saving alternative to conventional construction methods, one wonders if that becoming a generation of speed builders also means becoming the generation that makes too many mistakes. Maybe the Chinese are able to construct an fifteen story hotel in 6 days, but just how safe will the building be should another earthquake occur, even if that building is said to be earthquake resistant? The new, speedy, on-demand-construction trend should progress slowly. New construction methods are always welcome, but not at the expense of safety and quality.

The preceding article is a "sneak peek" from Building & Design, a newsletter from GlobalSpec. To stay up-to-date and informed on industry trends, products, and technologies, subscribe to Building & Design today.

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#1

Re: On-Demand-Construction for the Instant Gratification Generation

12/11/2010 9:53 AM

I don't know that I would call this phenomenon "instant gratification", nor "on-demand construction". Building prefabrication, whether it is in the form of components such as wall panels, floor sections, etc., or produced as nearly-completed modules, is a much more efficient and, therefore, economical way of building. The ability to produce wall panels, floor assemblies, and roof assemblies in a factory environment, permits the use of jigs for accurate sizing, more mechanized assembly activities, better control of the raw materials, a climate-controlled production area, and a better end product.

In the case of true modular construction, the modules must be designed to withstand the rigors of highway transportation to the building site and crane-lifting to erect the building as the modules are fitted together. This fact alone, results in a structure that is significantly stronger and more stable than a site-built structure. Add to this the fact that none of the components have been exposed to weather during the fabrication process, and the result is a structure with much less tendency to shrink, or to have long-term issues on account of moisture that has been trapped into it on account of weather exposure, perhaps for months.

From the completion of an order for a typical single-family home, the duration of time for the fabrication, delivery, assembly of the modules, and completion of on-site work related to items that cannot be completed in the factory can be anywhere from 6 weeks to 3 months, depending on factory backlog, site infrastructure work, and availability of the "set and stitch" crew. I think that this just represents a more efficient way of building, and the way of the future, rather than any form of "instant gratification" or "on-demand construction". What it does require is a thorough understanding of all of the desired elements that are to be included and the selection of all finish details at the time of order placement, rather than in phases as is typical for on-site construction. If a potential buyer desires "instant gratification" for a new home, one only has to find a "spec" home on the market and buy it .

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#5
In reply to #1

Re: On-Demand-Construction for the Instant Gratification Generation

12/16/2010 6:57 PM

Another reason to advance modular buildings is to attempt to keep up with the demand. When we were doing our study of how to use shipping containers in Haiti we discovered that world wide slums are more prevalent than they have to be due to inefficiencies inherent in traditional building techniques.

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#2

Re: On-Demand-Construction for the Instant Gratification Generation

12/14/2010 7:07 PM

I would really worry about prefabricated building foundations.....most places around the world cannot accommodate such types of construction due to unstable soil types and seismic considerations.

In my judgement, codes should govern, not "instant gratification" or "on-demand", period!

BTW, you forgot to mention 8-track tapes in your list of things gone bye bye! Maybe we're lucky they're gone now, like disco!!! LOL

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Re: On-Demand-Construction for the Instant Gratification Generation

12/15/2010 10:18 AM

In the examples I cited, the foundations are a part of the on-site infrastructure construction and, in the case of a true modular building, would typically consist of a concrete spread footing with either a masonry or formed concrete stem wall with a crawl space for access to utility connections and for connection of other structural and mechanical elements. In the case of a panellized building, the foundation could be a typical slab with perimeter turn-downs to suit local building codes. Of course, either of these building methods is suited to a full basement foundation.

In all cases, the foundations must satisfy local building code requirements and pass inspection prior to the other building elements progressing. In regard to seismic considerations, significant destructive testing has been performed on modular homes to both verify the design criteria and to demonstrate the superior stability of modular construction in seismic zones. The same is true of hurricane zones.

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#3

Re: On-Demand-Construction for the Instant Gratification Generation

12/14/2010 8:32 PM

In another thread on here, we were told that the architect had been a major developer of the precast modular concrete construction methods, resulting in building construction in 28 days... very interesting.. and not new.

Thomas Edison investigated ways of creating whole iron moulds for the pouring of concrete houses... in the late 1800's.

Chris

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