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Barndominium is an open floor metal construction that requires proper insulation to keep it weatherproof.
Proper insulation would provide a barndominium following advantages:
Insulation is one of the key factors to make a barndominium weatherproof. However, depending on the type and size of the barndoinium, we use different insulation materials.
This article will discuss the significance of the insulation in barndominium and will discuss the other technical side of it.
First of all, Proper insulation would keep a balanced temperature in a barndominium that ultimately enhances its durability and livability. Since the structure is built with metal structure and the metal sidings are used outside, a barndominium without insulation would have temperature volatility inside.
Moreover, with the proper insulation, a barndominium owner would reduce significant energy from the reduced use of heaters and air conditioning. Not only that, insulation also helps in lowering the utility cost in various ways.
Similarly, insulation works as an active sound-proofing agent for the barndominiums. Because of the use of metal roofing and siding, rain and harsh weather make it noisy, and insulating materials reduce the noise considerably.
We tested a barndominium noise reduction by applying spray foam insulation and the result was surprising. There was a 29-decibel decreased noise when the owner insulated his barndominium. Notably, the storm door and airproofing also contributed to such noise reduction.
Insulation also helps in moisture control and saves the metal frame from getting rusted. As we all know humidity can oxidize the metal frames and bring rust, insulation acts as a humidity and moisture blocker by stopping the free flow of temperature between different layers of steel.
Notably, insulating your barndominium would offer you a US tax credit of up to $1200 as per the IRS circular.
Above everything, proper insulation would provide you the opportunity to get higher resale value in the future. Remember, future buyers will always value a healthier and energy-efficient living space.
The choice of insulation varies by the climate & location of the barndominium and construction types. For instance, a barndominium made with wooden poles would have different insulation compared to the metal barndo.
The US Department of Energy (DOE) sets the insulation guidelines for the houses depending on climate and other factors.
The DOE suggests that barndominiums located in cooler climates would need powerful insulation compared to the barndominiums from warmer climates. The DOE also provided a map that exhibits insulation levels, varied by different zones.
For example, Zone-2 (southern part of the US) would require R30 to R60 insulation and R13 to R15 for wall cavities. (we will clarify the R-value in the later part of this article).
They also recommended using air-sealing to get the best performance which we have already mentioned in our previous article regarding the barndominiums durability.
The following are the available types of insulation:
Let us discuss one by one.
Batt insulation is typically made from fiberglass, or cotton/mineral wood. There are pre-cut butt panels that are placed on the wall and floor as a means of insulation.
Batt insulation (also known as blanket insulation) is a popular affordable choice for wooden construction but not recommended for metal construction because of not having moisture resistance.
Since it is available as a pre-cut version, it is easier to install compared to other insulators. Also, batt insulation is cost-effective and would not require any special training to set them. It also offers comparably better soundproofing doing to having thermal properties inside.
Since the batt insulations are available in the precut version, there is a possibility of gaps between them. Such gaps or uneven installation would hamper the purpose of insulation.
Additionally, batt insulation is not moisture resistant which affects the overall durability of the barndominium especially if it is a metal barndo.
Roll insulation is also pretty similar to batt insulation which is also made from fiberglass or mineral fibers. Unlike the batt insulation, the roll insulators come as a roll so that the user can cut as per their need.
The R-value of the roll insulation would exactly be the same as batt insulation which is 3.2 to 3.8 per inch.
Here’s a detailed cost analysis for barndominium’s insulation.
Roll insulation can be a cost-effective choice but would not be a suitable option for the metal barndominium for not having moisture resistance.
The main advantage of roll insulation is that it does not come in a predetermined shape. It’s cost-effective compared to other types of insulation and would not require any special training to install.
The main disadvantage of roll insulation is the unavailability of moisture resistance which makes it unfit for the metal houses. Even if it comes in a roll, inefficient cuts would again leave gaps and damage the ultimate purpose of the insulation. Furthermore, sometimes handling can be difficult as the rolls are heavy and not convenient to cut.
Foam board insulation or, the rigid foam insulation appears in rigid panel. This insulation is typically made from polystyrene, polyurethane, or polyisocyanurate.
Rigid foam insulation have higher R-value compared to the batt and roll insulation which ranges from R-4 to R-6 per inch of thickness.
Radiant barrier insulation is produced from highly reflective materials such as aluminum foils. It reflects the light/temperature in its opposite direction and keeps the wall or roofless heat absorbent.
Radiant barriers do not have any R-value as it does not function like other types of insulation. So, using only the radiant barrier wound not meet the guideline set by the US Department of Environment (DOE). But, you can use them with other types of insulation for better insulation and stronger energy efficiency.
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Blown-in insulation or loose-fill insulation works by blowing loose cellulose, mineral wood, or fiber-glass. The R-value of the blown-in insulation varies from R-3 to R-3.8 (depending on what are you blowing).
This is worth mentioning that the R-value decreases after the material gets stalled after blowing on the wall.
Spray foam offers the greatest insulation having the highest R-value. It works by spraying material (isocyanate and polyol resin) after which the foam expands to fill nearby spaces. There is no risk of gaps upon applying spray foam insulation.
Spray foam insulation offers an R-value of 3.5 to 6 per inch which is extremely good if multiplied by the thickness it offers.
Undoubtedly, the spray foam insulation is the best choice for metal barndominium. If you make wooden infrastructure then the batt or roll insulation and even the blown-in insulation would work. However, if you need better moisture protection, there is no alternative choice than the spray foam insulation.
Moreover, the choice of insulation for the barndominium would vary depending on the following factors:
Compare spray foam with fiberglass here.
R-value measures thermal resistance. Alternatively, it indicates how much can any insulation material resist heat flow.
The R-value depends on the type, size, and thickness of the insulation. Primarily, the R-value is measured as thickness per inch. For instance, the batt insulation provides an R-value of 3.2 per inch which means, if you double the thickness inches , it will become 6.4 and by trippling the thickness inches it will reach close to 10.
So, a higher thickness or adding an extra layer of thickness of your insulation material would offer a greater R-value (better insulation).
Undoubtedly, spray foam insulation is the best choice for a barndominium because it offers the highest R-value of a minimum of 3.5 per inch and its nature of expansion covers all the hidden areas. However, the insulation choice can vary depending on the structure of the bardnominium. For example, the open spaces may be insulated with blown-in insulation which offers a cost advantage.
Barndominium exterior walls can have thicknesses from 5 inches to 20 inches depending on the design, location, climate, and insulation type. For example, If you use batt insulation, you need to increase the layer to achieve the target R-value.
Insulation is a must for the barndominiums. Especially, if your location is in windy area, or extremely cold area. From our experience, spray foam always works better for the metal barndominiums. However, you may use other types of insulation depending on the structure, size and the location of your barndo.