Monthly archive for October 2017

R-Value Part 4: Is More Insulation Better?

Part Four: Is More Insulation Better? In the previous sections of our deep dive into insulation, we’ve covered the basic types of insulation, discussed the properties of ICFs, and talked about the difference between actual and performance R-value. Now let’s take a look at the wizard behind the curtain, the secret sauce, the ICF MVP… concrete.  Concrete doesn’t really add any R-Value, but what it does is resist changing temperature. It requires a lot of energy to change the temperature of concrete. Think about a concrete sidewalk after a hot summer day. That concrete will radiate heat and is still warm

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R-Value Part 3: Fun with Foam

Part Three: Fun with Foam In the last article, we mentioned that BuildBlock ICFs and most others use about 2.5” of EPS (expanded polystyrene) foam on each side of a concrete core. The concrete core provides the strength and is designed to generally match the construction of standard reinforced concrete wall thicknesses (ACI 318 to be exact). So that explains the concrete, but why 2.5” foam panels? Honestly, there are two reasons. First ICF forms must be able to withstand the pressures created when rebar is added and concrete is first poured into the forms. Most ICFs are 16” tall and

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