Of all construction materials, concrete is one of the most resistant to heat and fire. That fire resistance gives houses built with insulating concrete forms (ICFs) certain safety advantages. And those advantages give buyers yet another reason to consider a HomeCrete Home for their next home.

Experience shows that concrete structures are more likely to remain standing through fire than are structures of other materials. Unlikely wood, concrete does not burn. Unlikely steel, it does not soften and bend. Concrete does not break down until it is exposed to thousands of degrees Fahrenheit - far more than is present in the typical house fire.



This has been confirmed in so-called "fire-wall" tests. In there tests ICF walls were subjected to continuous gas flames and temperatures of up to 2000°F for as long as 4 hours. None of the ICF walls ever failed structurally. All of the ICFs tested were of the "flat" or "uninterrupted grid" type, having no significant breaks in the concrete layer. In contrast, wood frame walls typically collapse in an hour or less.

Concrete walls have also proven more resistant to allowing fire to pass from one side of the wall to the other. This is especially of interest in areas with brush fires that could spread indoors.
The fire wall test confirms this rule for ICFs once again. Part of the test measured how well the wall slows the passage of the heat and fire from the side with the flame to the other side. The ICF walls tested did not allow flames to pass directly through. They also did not allow enough heat through to start a fire on the cool side for 2-4 hours. In contrast, wood frame walls typically allow both flame and fire-starting heat through in an hour or less.

The foams in ICFs are manufactured with flame retardant additives. These prevent the foams from burning by themselves. If you hold a match to the material, it will melt away.

Practically any organic material, be it wood or plastic, gives off emissions when it is subjected to intense heat or flame. The Southwest Research Institute reviewed the numerous existing studies of fire emissions and concluded that emission from polystyrene foam are "no more toxic" than those from wood.

Also in a typically HomeCrete Home are much less foam than wood in a typically wood frame home. In either case in a HomeCrete home are in the case of fire the emissions less than in a wood frame home

No matter what your walls are made of, there is no sense playing with fire. Building codes require covering the inside face of exterior walls with a fire-resistant material, such as gypsum wallboard or a stout plaster.

In areas prone to outdoor fires, it is wise to finish the exterior with a fire-resistant material, too. Favorites are Portland cement stucco and masonry.

And of course the more you can design your home to limit the exposure of flammable materials like wood and fabrics, the better.