Introducing our largest model to date, The Oasis 5. Learn more

Construction

New Home Insulation: How to Choose the Best Insulation for Your Home

When building a new home, choose the best insulation for your house and location.

Welcome Homes
/ Jan 21, 2022 / 4 min read
As we make our way through the colder months of the year, everyone’s mind is on keeping warm.

An estimated 63% of single-family homes in the U.S. do not have adequate insulation. Fortunately, when building a new home you can choose the best insulation for your house and location from the start.

How can you choose the best option? What type of insulation should you look for?

There are two important considerations:
  1. Where the insulation will be installed (walls, attic, basement, etc.)
  2. Regional location
With this in mind, let’s dive in and see how you can find the best new home insulation now.

READ: What Is R-Value & Why Is It Important?


Insulating Your New Home: Understanding R-Values

The R-value of insulation refers to its insulating properties. Generally speaking, the higher the R-value, the more effective the insulation will be. 

The colder your region’s climate is, the higher the recommended R-value will be. The coldest places will see a ranking of 6 or 7 (or very rarely, an 8). Places that are fairly cold will be rated 4 or 5, while more temperate regions are rated at 3 or below. Homes that are located in the highest zones typically want a higher R-value, but the exact R-value will depend on the specific area/room you’re insulating. (You can mix and match insulation materials throughout your home.)

See this helpful chart:
As you can see, an uninsulated attic in Zone 6 has an R-value of R-60, while an uninsulated floor in the same area has an R-value of R-30. For New York, a wood-framed wall has a rating of R-20 (in Climate Zone 5) or R-23 (Climate Zone 6). Ceilings are rated R-49 (Climate Zone 5) or R-60 (Climate Zone 6).

New Home Insulation: What Options Are Available?

Let’s look at the different types of insulation and which might be best for your new home. 

Blanket Insulation
Blanket insulation is one of the most commonly used in the U.S. It is usually made from fiberglass, mineral wool, plastic fibers, or natural fibers. One reason this insulation is so popular is its price: it’s one of the most cost-effective options out there. It’s also relatively easy to install since it’s flexible and can be cut to size. 

Blanket insulation comes in varying thicknesses and R-levels, so choose one that’s the best for your region and application. Keep it in mind that fiberglass absorbs moisture, so it may not be the best choice for a basement or other areas at risk of flooding or excessive moisture. 

Foam Board
Another popular option is using foam boards, also known as rigid foam. These can be used to insulate a range of areas, including walls, roofs, and attic doors. Foam boards can be made from polystyrene, polyisocyanurate (a thermoset plastic), or polyurethane. They tend to have a high thermal resistance—up to two times what most other materials have for the same thickness.

Unlike traditional fiberglass blanket insulation that absorbs water, foam boards are water-resistant, making them ideal for basements. The downside? They’re often more expensive than traditional blanket insulation.

Rigid Fiber Board Insulation
Rigid fiber board, sometimes known as fibrous board insulation, is frequently used for insulating air ducts. It is usually made of fiberglass. Insulating your ducts is a good idea, especially when you consider that you can lose up to one-third of your heat through poorly insulated ductwork. The insulation of rigid fiber board is generally done by HVAC contractors, who fabricate the insulation before installation.

Concrete Block Insulation
If you’re building a new home, concrete block insulation is another option. This method involves insulating concrete blocks that are then used to build the home’s foundations and walls. There are a few different ways to do this. Blocks can be filled with insulation, though studies have indicated that core filling offers minimal fuel savings. Installing insulation over the surface of the blocks may be a better option. Precast masonry units like autoclave concrete are also available and can offer up to ten times the insulating value of conventional concrete.

Insulating Concrete Forms
Another option is to use insulating concrete forms (ICFs). ICFs are made of connected or interlocking foam boards or blocks that essentially form a cast for a concrete wall. These boards are often reinforced with rebar, before concrete is poured into them. After the concrete has set they remain part of the wall assembly. This type of insulation offers a high R-value, typically around R-20. However, they’re difficult to install and may not be available where you live.

Sprayed-Foam & Foamed-In-Place Insulation
Liquid foam insulation is a good option for filling in where you need extra insulation, including around joists, door frames, and window frames. It can also be used for bigger areas like attic surfaces or below floors, or even blown into walls. Small cans of foam-in-place insulation can be purchased for DIY cavity filling. 

Blown-In Insulation (Loose-Fill)
Blown-in insulation, also known as loose-fill insulation, consists of small particles of cellulose, fiberglass, or other materials. Blowing the insulation into a wall requires specialized equipment but can be a good choice for insulating existing structures like closed walls. Fiberglass blown into an attic has an R-rating of 2.2 – 4.3 per square inch, while in a wall it has an R-rating of 3.7 – 4.3. This can be compared to traditional fiberglass batt, which has a rating of 3.1 – 3.4. 

Radiant Barriers & Reflective Insulation Systems
Radiant barriers work by reflecting radiant heat. They are a good option for warmer regions or attics to help reduce heat transfer.

You have many options for insulating your new home. Be sure to keep your geographical region and R-value in mind.

Let's insulate your dream home. Get started today.

More from Construction

Welcome Blog - How Welcome Homes Selects Land for Custom Homes

It's important to consider all factors prior to purchasing the land—once building begins, there's really no turning back.

Alec Hartman
/ Feb 1, 2021 / 2 min read
Welcome Blog - Construction Loans: Everything You Need to Know

Building a new home? You'll probably need a loan to finance the project. Here's what you need to know about construction loans.

Welcome Homes
/ Jan 4, 2022 / 3 min read
Welcome Blog - Gas Heat vs. Electric: Pros, Cons, Comparisons & Costs

Understanding gas heat and electric heat, pros, cons, comparisons, and costs for a new home.

Welcome Homes
/ Jan 6, 2022 / 2 min read

More from Home Buyers

Welcome Blog - Converting Home Buyers to Home Builders

Why can’t I get a new house that I love in a place I want to live at a price I want to pay?

Alec Hartman
/ Oct 15, 2020 / 1 min read
Welcome Blog - Introducing The Oasis & New Addition to the Welcome Homes Team