Home > architecture, sustainability > RASTRA insulated concrete formwork:

RASTRA insulated concrete formwork:





  1. December 9, 2006 at 4:07 pm

    Polystyrene is classified according to DIN4102 as a “B3” product, meaning highly flammable or “easily ignited”. Consequently, though it is an efficient insulator at low temperatures, it is prohibited from being used in any exposed installations in building construction. It must be concealed behind drywall, sheet metal or concrete. Foamed plastic materials have been accidentally ignited and caused huge fires and losses. Examples include the Düsseldorf International Airport, the Channel tunnel, where it was inside a railcar and caught on fire, and the Browns Ferry nuclear plant, where fire reached through a fire retardant, reached the foamed plastic underneath, inside a firestop that did not consider bounding.

    In addition to fire hazard, substances that contain Acetone (such as most Aerosol paint sprays) and Cyanoacrylate glues can cause polystyrene foam to melt.

  2. December 9, 2006 at 4:10 pm

    Established in 1987, moladi has developed construction technology addressing the basic need for durable quality housing which is a viable affordable alternative to traditional building methods. Representing the most advanced technology and innovations in industrial construction of affordable low-cost housing, schools clinics and other structures, with years of experience in the industry our knowledge has inspired subsequent ulterior solutions for development.

    Lack of resources, insufficient funds, skills shortage, time constraints, work flow control and waste are key challenges embodied in affordable housing shortages. Our technology addresses these issues and this is why individuals and organisations recognise moladi as the solution to housing needs throughout the world.

    With the help of locally trained unskilled labour, the conduits, electricity, trusses, doors and windows are strategically cast in situ which eliminates the need for chasing or beam filling, which greatly reduces waste. The use of unskilled labour aids in job creation and the transference of skills and technology promotes development within under privileged communities.

    Having undergone and passed rigorous testing by the South African Bureau of Standards (SABS), we have received numerous awards for our high standards in innovation. Constituting a lightweight patented, reusable, recyclable plastic framework system and SABS approved lightweight aerated mortar (which holds Agrément Certificate 94/231) the results are durable, permanent reinforced mortar structures of the highest quality and which is certified by the National Home Builders Regulation Council and bonded by top financial institutions.

    The moladi technology is easily adaptable to the specified design requirements and is suitable for all types of buildings, yet highly suited for use in the mass housing markets; successfully alleviating many of the logistical problems facing the construction of affordable repetitive housing projects.

    By utilising indigenous materials the benefits of the technology are spread to local communities. With a highly developed and reliable technology like moladi, the simplicity of the construction process allows for the ownership of a home to be within reach to many thousands of people. By applying the highest quality standards and a disciplined approach to the construction method, the cost of the entire housing delivery process is lowered, without it negatively impacting on the quality or social acceptability of the structure. moladi has been specifically designed and proven to deliver a fast track, cost-effective and easily transferable technology.

    We supply our technology and support transfer of know-how by means of on site training internationally.

    You are invited to visit our website at http://www.moladi.com

  3. December 9, 2006 at 4:15 pm

    this is true, polystyrene is flammable, and it does need to be hidden behind gypsum board or concrete or some other sort of non-flammable sheeting material. generally, i agree that EPS is not the best material.

    RASTRA, however, uses recycled polystyrene (so there’s a big plus for the product) as insulation AND formwork. that means that instead of using plywood for formwork, as is generally standard practice, you’re using the insulation. that means that you don’t lose the formwork material, and you also don’t have to apply insulation to your walls after they are poured. additionally, having insulation on both the inside and outside of the walls increases the effectiveness of the insulation, and there is no thermal break between inside and outside (for instance, say you put insulation on the inside of your building, which is standard practice, but you bolt some steel structure into the concrete for your ceilings or second floor. that steel will now conduct the heat through the concrete wall. w/ insulation on the outside, this is not an issue.).

    so overall, this is a nice product as it is modular and easy to install, uses recycled material, is highly insulative and produces practically no waste during the installation process.

    the reason that i put this pic up in the first place, though, is because the line is pretty funny.

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