Insulated Concrete Forms | ICF Home Cost & Problems | Insulated Concrete Forms Pros and Cons
Insulated Concrete Forms
What is Insulated Concrete Form
Insulating concrete form, also known as insulated concrete form (ICF), is a type of reinforced concrete formwork that is often created with a rigid thermal insulation that serves as a permanent interior and exterior substrate for walls, floors, and roofs.
Insulating Concrete Forms (ICFs) are concrete wall forming systems that are not removed after the concrete has hardened, but rather remain in place as part of the structure.
In most cases, the forms are built of high density styrofoam or other lightweight materials. Insulated concrete forms are either pre-formed interlocking blocks or separate panels joined together with plastic or metal connectors.
The insulated concrete forms, which are left in place, not only provide continuous insulation and a sound barrier, but also serve as a backing for drywall on the inside and stucco, lap siding, or brick on the outside.
The forms are made out of interconnecting modular parts that are dry-stacked (no mortar) and filled with concrete.
The modules link together in a manner similar to Lego bricks to form the structural walls or floors of a building.
As more strict energy efficiency and natural disaster resistant building requirements are enacted, Insulated Concrete Forms construction has become popular for both low rise commercial and high-performance residential construction.
Insulated Concrete Forms Manufacturing
Insulating concrete forms are manufactured from any of the following materials:
- Polystyrene foam (most commonly expanded or extruded)
- Cement-bonded polystyrene beads
- Cement-bonded wood fiber
- Polyurethane foam (including soy-based foam)
- Cellular concrete
Before the concrete is poured, reinforcing steel bars (rebar) are frequently put inside the forms to give the concrete flexural strength, similar to bridges and high-rise buildings composed of reinforced concrete.
The forms, like other types of concrete formwork, are filled with concrete in 1- to 4-foot-high “lifts” to manage concrete pressure and decrease the possibility of blowouts.
Insulated Concrete Forms House
Insulated Concrete Forms (ICF) are becoming an increasingly popular method of home construction. This novel building material is typically comprised of polystyrene foam blocks with space in between for a concrete wall to be poured.
Traditionally utilized for foundation walls, many builders are now taking ICF a step further and employing it for above-grade walls in 1, 2, and 3 story homes.
How Long Does Insulated Concrete Forms Last?
Insulated Concrete Forms homes have a lifespan of more than 100 years and require no maintenance because the foam does not deteriorate. It is also worth noting that Insulated Concrete Forms homes might provide additional protection against natural disasters.
These dwellings are suitable for coastal areas since they function well in floods. Because of the reinforced concrete, they are also ideal for strong seismic zones. Some contractors can even guarantee a 4-hour fire rating. If you live in a disaster-prone area, an Insulated Concrete Forms home may provide you with piece of mind.
Because of the durability of Insulated Concrete Forms structures, renovation is challenging. If you intend to completely remodel your home in the future, you might want to select a more adaptable building material.
Insulated Concrete Forms Pros and Cons
Pros /Advantages of Insulated Concrete Forms
ICF are Walls strong
The principal benefit of adding an insulated concrete form is that it strengthens the walls of a building. The poured concrete hardens around the Insulated Concrete Forms, reinforcing the wall and making it less vulnerable to vertical and horizontal stresses.
The frequency and rigidity of the inner connectors can be increased depending on whether the Insulated Concrete Forms frame is flat or grid. Unlike a typical cement installation, the pockets and Insulated Concrete Forms s between the walls actually strengthen the strength and durability of the building.
Temperature Stability and Noise Reduction
Insulated concrete forms can operate as a sound barrier, shielding the interior of the home from outside disturbances, thanks to a material sandwich. When a large material, like as concrete, is coupled with a light one, such as foam, temperature, air filtration, and sound variations can be drastically reduced.
The layer of foam that insulates the entire ICF wall helps to keep it at the same temperature throughout, effectively eliminating “cold spots” that occur in frame walls between insulation gaps or around the studs. In terms of sound reduction, insulated concrete form walls allow only one-eighth the amount of sound to get through as a wood frame wall.
One of the most tempting elements of employing insulated concrete forms is the ability to drastically lower a building’s heating and cooling expenditures. That is also the most striking property of ICF walls; they can release and retain heat in the summer and winter. In some cases, ICFs are predicted to save up to 20% of total energy costs.
In comparison, the tightness around insulated concrete form walls is significantly greater than that of comparable window and door frames.
If your insulated concrete forms have a 100-year lifespan with no deterioration, a single-family Insulated Concrete Forms home might save up to 110 tons of CO2 when compared to standard wood-framed buildings. That much CO2 savings would result in a net positive carbon footprint for the cement and ICFs.
Reduces material costs
You could establish walls and foundations with 10% less concrete by incorporating insulated concrete forms into various walls or portions of the construction process. When ICF is supplied to the project site, it is frequently provided as straight-form blocks that have already been constructed. This can save you a couple of inches of thickness when compared to standard straight form designs, which can result in a 25% boost in material and expense savings.
ICF are Beautiful
Insulated concrete form homes can be created in any style and can be finished with any typical exterior finish such as siding, stucco, or brick. Consider the pure beauty that may be added to insulated concrete form homes, in addition to the many useful qualities. Any of today’s most popular design aspects can be accommodated by insulated concrete form systems.
Cathedral ceilings, lofty walls, and wide apertures are just a few of the design alternatives. Concrete can make an infinite number of curves and angles since it may assume any shape or form.
Cons /Disadvantages of Insulated Concrete Forms
It Reduces the Floor Space Inside the Construction.
Smaller homes don’t profit as much from insulated concrete forms because the additional size of the walls decreases the amount of floor area available.
ICF walls include several inches of hard insulation and reinforced concrete, so they take up a lot more space than a standard timber frame.
It can be Expensive
The cost savings associated with insulated concrete forms are clear; however, this assumes you have access to reasonable labor to install it. If you elect to use ICFs in your project’s walls or foundation, you may face higher overall expenses than with traditional methods.
Insulated concrete forms necessitate specialist labor; if your jobsite is in a location with few contractors capable of incorporating ICF, you may want to consider using a less expensive alternative.
Insulated Concrete Forms (ICF) Do Not Perform Well in Cold Climates
In theory, these walls operate as effective heat insulators at colder external temperatures. However, this does not take into consideration the quantity of heat that transfers outdoors.
Insulated concrete forms are designed to transport heat out of the construction so that external temperatures do not interfere with the curing process of the concrete. As a result, ICFs perform significantly better in more tropical conditions, where heat transmission and insulation can keep a home cool during the day while keeping it comfortably warm at night.
Some projects may be able to incorporate rebar reinforcement.
The use of rebar provides a significant portion of the strength of insulated concrete form walls. These moldable steel wires are ideal for strengthening the concrete and fitting between the joints of the internal grid.
Unfortunately, many new ICFs incorporate plastic connectors that operate as cheaper and more flexible reinforcing wires, leaving very little space for the installation of rebar. This is especially concerning around corners, where ICFs can be subject to wall cracks and other structural instabilities.
If you have access to specialized contractors or are unconcerned about installation costs, insulated concrete forms are an excellent alternative for any concrete wall or foundation.
These forms improve temperature regulation, cut material costs, dampen exterior sounds, strengthen wall strength, and save you a lot of energy.
Insulated Concrete Forms Cost: Is ICF Construction Less Expensive Than Standard Wood-Frame Construction?
Insulated concrete forms cost about $150 per square foot, which is 2% to 7% more than standard wood-frame construction.
Overall, you’ll likely end up spending about 5% to 10% more in total construction costs than you would for a conventional wood-frame home.
Do keep in mind that the price of concrete can fluctuate, and the price of your home is also dependent on the design, local construction labor costs, and additional factors.
It is also important to remember that the amount of time required to compile all of the necessary permits for an ICF home will likely take longer than for a conventional home.
Since this is not the standard in the residential construction industry, the permitting process can be a bit more arduous. A licensed builder will likely be familiar with this process to make it a smoother (and hopefully quicker) experience.
And, for those DIYers out there, Insulated Concrete Forms homes are not something that we would recommend attempting yourself if you are not a licensed professional.
Insulated Concrete Forms Home Problems
As most of these ICFs are made with the intention of providing a dry space, there are some potential problems that may arise.
- Form Bent – Formed forms are bent over time due to natural forces from the earth and human weight on the form. Once the form is bent, it can’t be straightened back out without damaging the form and it will need to be replaced.
- Form Breakage – The insulation and cement that are used to form the form can break down over time due.
- Moisture may be an issue for some, as mold can grow from the moisture.
- Diagnosing ICF foundation issues is more difficult for foundation repair professionals.
- Some ICFs don’t have the ability to be insulated.
- Limitations of ICFs that are not waterproof, as water may leak
- The inability to change the length of ICFs once they are formed.
- ICFs are more expensive than traditional home construction which means that they are not an option for budget conscious home buyers.
- ICFs do not allow for adjustments to the structural form which can be problematic if the house turns out to be too small or too large.
- Builders typically need to use precast designs which can lead to an inflexible design process.