In the previous article, I mentioned the two possible insulating concrete form construction techniques: pre-formed, interlocking blocks; and separate panels which are tied together using plastic or steel ties. As well as different construction methods there are also three main shapes within these two techniques:

• Flat — This form gets an even thickness of concrete throughout the wall, like a conventional poured wall.

• Grid — The grid system creates a waffle pattern. The concrete is thicker is some places that in others.

• Post and Beam — Also called “screen grid,” this shape forms horizontal and verticle columns of concrete. It offers significantly less fire resistance than the previous two systems.

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Insulating concrete forms, or ICFs, are basically just forms for poured concrete that stay in place permanently as a part of the wall. The forms are constructed of foam insulation, and are either pre-formed, interlocking blocks or separate panels that are connected with plastic ties.

Houses built with ICFs are fire-resistant, and wind-resistant. Obviously they are better protection during tornadoes than traditional wood-frame houses. This type of building material is highly sound resistant, making for a peaceful home in even the busiest areas. They also provide R-values of between R-17 and R-26, higher than wood-frame construction R-values (R-12 to R-20). This cuts energy consumption by up to 40%. ICF buildings require very little repair and maintenance. They are about 0.5 to 4% more expensive than conventional building techniques, but this is quickly recuperated with the savings in energy.

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