Compressive strength, percent of 28-day moist cured concrete. Graph showing hydration at work. (Courtesy of Portland Cement Association)

According to the Portland Cement Association, concrete poured and cured inside an insulating concrete form gains approximately 30% more strength than the same concrete poured in wood forms.

This simply means 6 7/8 inches of concrete poured in a Superform wall provides the same structural strength as 30% more concrete poured in conventional wood forms.

IE: 6 7/8" Superform = 9" wood.

The Reason? When concrete is cured properly, as in the graph above, it does not lose moisture to the air, and the hydration process of cement and water, takes place under optimum conditions.