Practical and durable: When comparing batt insulation vs. blown cellulose, keep in mind that batt insulation is a more effective thermal barrier. The thermal performance of loose fill insulation will not last for the life of the building. Most blown-in insulation materials will settle and lose R-value over time.
Loose-fill insulation can be installed in just about any roof shape, as the fibers can be blown into tight corners and can fill spaces that batt insulation covers. Since the finished installation doesn't have seams, loose-fill insulation can provide better insulation by up to 22%.
Cons of Blown-In Attic Insulation:
Poor installation can lead to uneven coverage, material waste, and even structural issues like sagging ceilings. Hiring a skilled installer is crucial to getting the most out of this insulation type.
Why Fiberglass Batt Is the Best Attic Insulation Material. Fiberglass batt is considered to be the best insulation for attics.
Loose-fill is among the easiest types of insulation to install but harder to replace if it is compromised by moisture, mold, or pests. Blown-in insulation naturally fills into hard-to-reach spaces, fitting around joists, studs, or wiring.
Fiberglass batts offer the easiest way to add attic insulation or just about any area of your home. However, typically batts offer the worst insulation performance for any job.
In summary, we do not recommend the use of vapor barriers with cellulose insulation, except in circumstances of exceptionally high moisture levels, such as an indoor pool facility, and we warrant our cellulose insulation for the life of the building when installed by an approved GreenFiber insulation contractor.
Removing old insulation is generally recommended if it's damaged, contaminated with mold, or infested with pests. However, if the insulation is in decent shape and just needs a boost, adding a new layer on top can be a cost-effective option.
The higher the R-Value, the better the thermal performance of the insulation. The recommended level for most attics is to insulate to R-38 or about 10 to 14 inches, depending on insulation type.
Blown-in insulation, available in fiberglass and cellulose varieties, generally lasts 20 to 30 years. Fiberglass tends to be the more durable option, while cellulose is more sensitive to humidity, which can affect its longevity in certain climates.
Unlike blown-in insulation that can lower your energy bills by 25%, with spray foam insulation in your building you can profit from a 40% decrease on your monthly energy bills. Spray foam has the ability to expand 30-60 times the volume when installed, therefore it can seal all gaps and cracks on your walls.
Blown-In Cellulose Particles Are Paper.
Unlike glass fibers, cellulose isn't dangerous to breathe. However, it can irritate your lungs. If you have pre-existing allergies, the dust of cellulose insulation can be obnoxious.
Can cause mold and mildew – Because blown-in cellulose is made of paper products, it soaks up any and all moisture in the insulated area. A roof leak, pipe leak or high humidity can cause water to infiltrate the insulation, and insulated areas take a long time to dry back out.
Insulation Types and Materials
Loose fill (blown-in insulation) is best for tight spaces or if your attic already has a layer of insulation that just needs to be topped off. If you choose loose fill insulation, you'll need to rent a machine to install it.
Because it is both efficient and economical, blown-in or loose-fill fiberglass is an insulation material that sees widespread use. In most homes, loose-fill insulation can survive anywhere from 80 to 100 years before needing replacement, provided that it is not damaged.
Unfortunately, the majority of homes built 50 years ago were not insulated at all. It is important to be aware of these insulation issues if your home is 50+ years old. Replacement (or new installation) may be necessary if your home is drafty, if you have high utility bills, etc.
Leaving Too Many Gaps
One of the biggest problems DIY homeowners face is leaving too many gaps in their insulation. Gaps or insulation that isn't secured correctly can leave the building structure open to air and moisture leaks. Spray foam insulation is best for reaching into small cracks and any areas left open.
Any reputable insulation installer will thoroughly remove old insulation before putting in the new. However, as a homeowner, you should double-check that they remove all of the old insulation as a first step.
It is possible to over-insulate your house so much that it can't breathe. The whole point of home insulation is to tightly seal your home's interior. But if it becomes too tightly sealed with too many layers of insulation, moisture can get trapped inside those layers.
Lowe's is here to help with our blown-in and batt insulation installation service. There are two types of insulation material to choose from, and which one you choose is up to you. Cellulose insulation, made from recycled paper and treated to be fire-resistant, is the most common material used.
Most installers charge between $40 and $80 per hour to install insulation, so the more complex the project, the more it will cost. A few complexities that may increase the cost of labor include: Your installer needs to install insulation in hard-to-reach areas.
Loose-fill insulation isn't the cheapest type of insulation material, but if you're insulating an area, such as a small loft, that's particularly hard to reach, the loose-fill installation method means it can reach all corners, nooks, and crannies and reduce air leakage and heat loss.
Loose-fill insulation can be installed in either enclosed cavities such as walls, or unenclosed spaces such as attics. Cellulose, fiberglass, and rock wool are typically blown in by experienced installers skilled at achieving the correct density and R-values.
You can spread the insulation the old-fashioned way – by hand – pouring the material straight out of the bags into the cavities between the floor joists. Spread it around with a garden rake or broom. To coax it into difficult-to-reach areas, try a yardstick or short pole. Leave it loose, not packed down.