Blown-in Insulation

Blown-in insulation, also called loose-fill insulation, is made up of small particles of fiberglass, cellulose, or mineral wool that are installed using a blowing machine. Instead of being cut to fit like batts, it is blown into place to fill cavities and cover surfaces evenly. 

Blown-in insulation is commonly used in attics, wall cavities, and other hard-to-reach spaces. It works especially well in existing homes where opening up walls is not practical. Because it flows around obstructions, it is a go-to option for retrofit projects and topping off attic insulation. 

Blown-in insulation is installed using a machine that pushes the material through a hose and into the desired space. The hose is actually part of the installation as it breaks up and “conditions” the material during travel. The loose fibers settle into place and create a continuous thermal layer that helps reduce heat loss and air gaps. 

The right R-value depends on your climate and where the insulation is being installed. Attics usually require higher R-values than walls. Blown-in insulation makes it easy to add more material over time if you need to increase performance. If you are not sure what target to aim for, reach out and we can help you figure it out.

The most common materials are fiberglass, cellulose, and mineral wool. Each has different strengths when it comes to cost, moisture resistance, and density. If you are comparing materials or deciding between options like batt insulation or spray foam insulation, we can help you choose what makes the most sense for your project.

It depends on the application. Blown-in insulation does a better job filling gaps and irregular spaces, which can improve overall coverage. Batt insulation is often faster for open framing and new construction. If you are deciding between the two, it usually comes down to cost, access, layout, and how much detail work you want to deal with. Let us know what you are working on and we will point you in the right direction.

Yes, you can install blown-in insulation yourself with the right equipment and a little guidance. We rent pro-grade insulation blowing machines, the same kind contractors use, which deliver faster, more consistent coverage than the smaller units you might find at a big box store.

We will show you how to use the machine and get you set up for success before you start. It is still a more involved process than installing batts and can get messy if you are not prepared, but with the right setup, most DIYers handle it just fine. If you have questions along the way, you can always reach out and we will help you through it.

Some types, especially cellulose, can settle slightly over time. This is normal and is usually accounted for during installation by adding a bit of extra material. Proper installation makes a big difference here, so if you have concerns, we are happy to talk it through.

Yes, blown-in insulation is very effective at improving energy efficiency. Because it fills gaps and creates a more complete thermal barrier, it helps reduce air leaks and keeps indoor temperatures more consistent. 

Blown-in insulation is not ideal for areas where the insulation needs to stay in place without containment, such as open walls without netting or barriers. It is also not the best choice where you need structural rigidity or a built-in air seal. In those cases, options like rigid board insulation or spray foam insulation may be a better fit.

Blown-in insulation can help reduce sound transfer, especially when dense materials like cellulose or, even better, blown-in mineral wool are used. It does a solid job of dampening everyday noise, but like other insulation types, it is not a full soundproofing solution.

When installed correctly and kept dry, blown-in insulation can last for decades. The main things that affect performance over time are moisture, settling, and air movement. If you are upgrading older insulation, we can help you decide whether to add more or start fresh.

The biggest advantage is coverage. Blown-in insulation fills gaps, cracks, and irregular spaces better than most other insulation types, which helps improve overall performance and reduce air leaks. 

The biggest drawbacks are the installation process and potential settling. It requires specialized equipment, can be messy for DIY installs, and needs to be installed at the correct density to perform well. If you are not sure it is the right fit, reach out and we will help you weigh the pros and cons.