Best Insulation for Loft

Are you thinking of insulating your loft but don’t know where to start? You’re in the right place! Loft insulation helps to conserve energy, and it also increases the value of your home. When you start the insulation process, you need to insulate the interior walls, garage ceiling, and attic above the loft.

There are different types of insulation and what works for you depends on your unique needs and what area you want to insulate. Here are some of our recommendations for the best types of insulation for loft.

  1. Spray foam
  2. Mineral Wool
  3. Cellulose Insulation

Now, let’s take a more in-depth look at each of the above types of insulation for a better understanding.

Spray Foam Insulation

 Spray foam is a type of insulation ideal for walls, lofts, floors, and roofs. It is made of mixing methylene diphenyl diisocyanate and a polyol blend. Once you spray the foam, it forms a thick layer of insulation. Before you think about spray foam, consider whether you want permanent insulation. The insulation doesn’t get off once done.

Spray foam insulation can be high density, medium density, or low density. The high and medium density types of spray foam are also called closed-cell foam. Closed-cell foam works by forming a layer on the walls or roofing reinforcing thermal resistance. Low-density spray foam is also known as open-cell foam.  The open-cell foam forms a layer on surfaces but then leaves some tiny breathing spaces that allow for better drying making it more versatile.

Where Can I Use Spray Foam?

Different building codes restrict the usage of spray foam in certain areas. Depending on where you live, it’s essential to review the construction requirements for the loft. As a general rule of thumb, you can only use this type of insulation on the walls of the loft and the attic.

As a requirement, you should only install spray foam if you’ll drywall over it. It’s also worth noting that most building requirements dictate that you must fully cover the insulation. Leaving spray foam exposed can cause fire hazards that can spread very fast through the foam layer.

How Do I Install Spray Foam?

The process of installing spray foam is quick and straightforward. You only need to spray the foam on the surface you want. The foam rises fast and then dries, forming a thick layer. In some cases, you may need to scrape off the overflowing foam. It’s also worth noting that you need to consider the required thickness for the loft.

A single layer of spray foam is 100 times more than other typical insulation. Therefore, you need to hire a professional because they know what works where. Protective clothing is also necessary when handling spray foam because the fumes emitted during installation are dangerous to your health.

Mineral Wool Insulation

Mineral wool insulation is made out of molten stone, glass, and industrial waste spun into fiber materials. This type of insulation is perfect for areas with very high temperatures and where other types of insulation cannot work. Besides thermal regulation, mineral wool is the insulation of choice among most homeowners because of its high fire resistance properties and noise reduction.

Besides working to reduce the amount of heat in a home, mineral wool also insulates your home during winter. You can therefore save energy costs that would have otherwise gone to heating the house.

How to Install Mineral Wool Insulation

 You can install mineral wool as a DIY project in the afternoon or over the weekend. The insulation is easy to install because the materials are easy to cut through. You can measure the exact size of the material and fit it on the surface you want.

When buying your mineral wool, go for rolls and batts because they are easy to use and fit. Manufacturers sell batts in different dimensions, and we recommend that you buy the size closest to what you have in your house.

You only have to pick the mineral wool panels/batts and cut them to your desired sizes. Then fit the batts in between wood on your loft space. If you’re targeting the ceiling, you should place the mineral fiber between the roofing wood.

While installing the insulation, you need to wear protective clothing because the fibers can irritate your eyes, skin, and can also lead to respiratory problems if inhaled.

Where Can I Install Mineral Wool in the Loft?

By now, you’re probably wondering which components of your loft would mineral wool work best? Well, you can use this insulation on the garage ceilings and the walls.

Cellulose Insulation

Cellulose is among the oldest forms of insulation. Cellulose insulation is made from different materials such as corn cob, sawdust, paper, hemp, straw, and cardboard. Cellulose is then mixed with borate and boric acid, making it pest, mold, and fire-resistant.

There are 2 types of cellulose insulation applicable in different situations. We’ll expound on them here.

Types of Cellulose Insulation and how to install them

·         Blow-in cellulose insulation

With this type of insulation, cellulose is blown into surfaces that require insulation. With this insulation, you can do it yourself or hire a professional.

The process of installation requires two people. One operates the hose connected to a blower, while the other one handles the hopper. A hopper is a machine where you feed the cellulose fiber. The fiber is then broken down and passed through the blower. The best hose is one with a 3-inch diameter. Whether you’re insulating from the inside of the outside, the process is the same.

The best thing about using blown cellulose is that it compacts well around wiring, plumbing works, and crevices. Blown cellulose is perfect for attic floor and wall insulation. Also, make sure to air seal all the cracks before you install blown-in cellulose insulation.

·         Sprayed Cellulose

Unlike blow cellulose, which is dry fiber, sprayed cellulose is wet. This type of insulation involves spraying onto the targeted areas. Sprayed cellulose is perfect for wall insulation. You follow the same process to install blow cellulose and sprayed cellulose. The only difference is that a high-pressure nozzle similar to a pressure washer is used on the hose.

During installation, make sure that the cellulose fiber is moist enough and not overly so because it could lead to dampness issues. The right consistency also helps in making sure the insulation sticks on the walls. You can also add some adhesive to the sprayed cellulose to make it stick better.

Once the sprayed cellulose has dried on the surface, use a scrubber to scrape off until you get a uniform thickness. Sprayed cellulose is also ideal for insulation of the attic above the loft, just like the blown cellulose.


If you’ve been thinking of converting your attic, then the thought of the best insulation loft conversion has crossed your mind. Insulation helps with the regulation of heat, cold, and sound. You can also save a lot of money on energy with proper insulation of the loft space. You can consider spray foam, mineral wool, or cellulose insulation depending on your needs.