Blown-In vs. Batt Insulation: Which Is Better?
- Wes McEwan
- 15 hours ago
- 3 min read
Table of Contents
Choosing Between Blown-In & Batt Insulation for Your Home
Did you know that most residential attics in older homes lose enough heat every day to fill multiple large hot air balloons? You are likely spending more money than necessary on monthly utility bills because your current barriers are thin or gaps exist in the walls. Choosing the right material to keep your house warm or cool is one of the most effective ways to lower your expenses. You have two primary options when you look at traditional materials - pre cut blankets or loose fill fibers.
Understanding Fiberglass Batts
Batt insulation consists of large, flexible rolls or pre cut rectangular pieces of fiberglass - these pieces are common because they fit exactly between the wooden studs in your walls or the joists in your ceiling. You will see them often in new construction where the walls are still open and easy to reach. These blankets are often the least expensive choice when you buy them at a local hardware store. They are simple to handle because they stay in one piece. You can carry them into small spaces without needing heavy equipment or specialized machines.
Common uses for batts include:
Standard wall cavities in new rooms.
Unfinished basement ceilings.
Attic floors with regular spacing between joists.
The Benefits of Blown-In Insulation
Blown-in insulation or loose fill, involves a machine that breaks up chunks of fiberglass or cellulose and sends them through a long hose. You spray this material into your attic or inside finished walls through small holes - this method is effective because the tiny fibers settle into every small crack and corner. This material creates a continuous layer that covers the wooden structures of your house. It is excellent at stopping air from leaking through gaps that pre cut pieces might miss. Because the material is dense, it also helps quiet the noise coming from outside or from other rooms.
Installation & Difficulty Levels
You can install batts yourself if you have a pair of sturdy gloves, a mask and a utility knife. You simply press the material into the space and ensure it stays flat. You must be careful not to squeeze or compress the fibers. If you squash the material, it loses the air pockets it needs to stop heat from moving. Blown-in projects usually require two people and a rental machine from a supply store. One person feeds the material into the hopper while the other directs the hose in the attic. While it is faster to finish a large area this way, it is also a messier process. Dust and fibers will float in the air - you need high quality lung protection and eye covers.
Blown-In vs. Batt Insulation: Which Is Better?
Your choice depends mostly on the current state of your home - If you are building an addition or have the drywall removed, batts are the logical and easy path. They stay where you put them and do not settle over time. You can see exactly where the protection is and ensure there are no empty spots. If your attic is already full of wires, pipes and odd angles, blown in material is superior. It flows around obstacles like water, filling the spots that a solid blanket cannot reach. You save time because you do not have to cut dozens of small pieces to fit around every obstacle in your ceiling.
Quick comparison guide
Batts Best for DIY, low cost and open walls.
Blown-In Best for odd shapes, retrofitting old houses and maximum air sealing.
Both You can layer blown in on top of old batts for extra warmth.
FAQ
Which type of insulation lasts longer?
Both materials are durable and can stay effective for decades. Blown in cellulose may settle or pack down over multiple years, which reduces its thickness. Fiberglass batts usually keep their original shape for a longer period if they stay dry.
Can I put new insulation over old insulation?
Yes, you can add more material to your attic to increase your comfort. You just need to make sure the old material is not wet or moldy. Adding a layer of blown in fibers over existing batts is a very common way to fix cold spots in a house.
Is one better for the environment?
Blown-in cellulose is often made from recycled newspapers and treated with minerals to resist fire. Fiberglass batts also contain recycled glass. Both help the environment - reducing the amount of fuel you burn to heat your home.
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