Concrete is getting more green
Rob Smith is a principal at Architects Smith Metzger
Tilt up concrete construction has been around since the 1920’s and is typically identified with big box stores such as Home Depot and warehouses. Basically, a form is made on the ground and filled with concrete and reinforcing. Once the concrete is cured, the panel is “tilted up” on top of the footing and fixed in place.
This simple construction process is being used on sustainable structures across the country. While you don’t see it much in Iowa because of our winters, architects are using the unique construction for sustainable reasons.
First, concrete construction from the Romans is still intact so it is very durable. Tilt up buildings from the 40’s have had very little maintenance and are still performing.
Second, each panel is made on site so shipping is nonexistent compared to brick or precast concrete which can come from hundreds of miles away. Ready mix plants are usually within a few miles in metro areas.
Third, systems have been manufactured so an insulated sandwich panel can be cast on site. The encapsulation of the insulation provides a very good air infiltration barrier.
Lastly, the massiveness of the concrete resists temperature migration from the outside. Like the adobe homes with thick walls built by Native Americans, the heat of the summer sun is felt inside much later than when the sun has set. Some architects have even imbedded rubber tubing in south facing concrete walls and removed the heat during the winter for space heating.
Keep your eyes peeled for a tilt up project in Iowa.
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