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ICF Construction |
Insulating Concrete Forms (ICFs) are energy-efficient, cast-in-place reinforced concrete walls.
The forms are interlocking units or “blocks” that are stacked, reinforced with rebar, and filled with concrete. After the concrete is cured the forms become a permanent part of the structure providing 2 layers of thermal and acoustic insulation, fire protection, space to run electrical & plumbing, and a backing for drywall on the interior and the exterior siding.
The benefits of ICF construction are:
- Minimal air leaks resulting in less heating/cooling loss
- Lower energy bills
- High sound absorption
- Structural integrity in extreme weather conditions
- Low maintenance
- Higher resale value
- When constructed on a concrete slab, the walls and floors form one continuous surface keeping out insects
- Concrete does not rot when it gets wet
- Warmer in the winter and cooler in the summer: Standard R-Value in the Northern States will average around 30 and in warmer climates closer to 50. Average energy savings when compared to a standard stick-built home is greater than 30% and in some climates as much as 90% when combined with passive solar design. The EPA has consistently awarded concrete homes a 5 star Energy Star rating for energy efficiency.
- Fewer allergies: because concrete does not provide the “food” or environment conducive to mold & fungus, when the proper finishing materials are chosen you are able to greatly reduce the amount of allergens your home produces. The airtight properties as a result of the materials used also minimize the impact of outdoor allergens.
- Sleep better at night: ICF homes provide a great deal more sound barrier than a traditional home. When combined with high quality windows you can expect a quiet day & night.
- Withstand the elements: ICF homes are better prepared to withstand fire, tornados, hurricanes, earthquakes, floods, infestations, and so much more. Maintenance is low as well.
The Disadvantages of ICF construction are:
- Concrete cutting tools are required to move doors and windows after the pour is complete. This can be avoided, however, by careful planning before the pour.
- Cost may reach 5-10% higher than traditional 2×4 stick-built homes intially though those costs are quickly recouped in energy savings and lower mechanical costs. (Costs are consistent with standard 2×6 stick built homes)
Terminology:
Thermal Mass: A material that absorbs heat from a heat source, and then releases it slowly as the temperature cools just as a rock warmed in the sun will still radiate heat well after the sun recedes.
Passive Solar Design: Your home’s surfaces (windows, walls, floors, roof) can be designed to collect, store and distribute energy from the sun during the winter and deflect the energy during the summer without the aid of mechanical systems. You can find the five elements of Passive Solar Home Design at the U.S. Department of Energy site.
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