Yes, you can absolutely put too much blown-in insulation in an attic. While increasing your insulation improves energy efficiency, adding too much without proper planning can disrupt your home's thermal and moisture balance.
The optimal R-value for most homes is 30, but you can go as high as 38 if you live in a tropical climate. Anything higher than 38 indicates an over-insulated space.
Whole-house insulation is usually a one- to two-day process, not a long renovation. Work is staged by area to keep the project efficient: Attic insulation and air sealing.
For most attics, blown-in insulation should be installed to a depth of 10 to 20 inches, depending on your climate and the insulation material you use. This achieves the standard recommended thermal resistance (R-values) of R-30 to R-60.
Mice are curious and always searching for safe, snug, and warm nesting sites. Attics filled with blown-in insulation provide an excellent option–from the mice's point of view. As long as there is a ready food source. Mice are omnivorous and will eat and chew on almost anything including wood and electrical wires.
Blown-In Insulation: Costs about $1.00 to $2.80 per square foot, making it slightly more expensive than rolled insulation. However, blown-in insulation is better suited for filling irregular or hard-to-reach spaces, such as existing walls or tight attic corners.
To achieve an R-30 value, blown-in insulation typically needs to be 9 to 10.5 inches thick. The exact depth depends on the material used, as blown-in fiberglass typically settles at 10 to 10.5 inches, while blown-in cellulose requires about 9 inches.
Superior Thermal Performance: Cellulose insulation has a higher R-value per inch than fiberglass, providing better thermal resistance. Sound Insulation: Cellulose also provides excellent sound insulation due to its density, making your home quieter.
Insulating a 2,000 sq. ft. attic costs between $2,000 and $9,000, with most homeowners paying around $3,600 to $5,800 for professional installation. The wide price range depends on the type of insulation, labor rates, and whether old insulation requires removal.
What time of year is Insulation cheapest?
Foam insulation is a common target because it's easy for them to chew through. The material offers little resistance, allowing mice to create tunnels or nests within the insulation. But mice aren't just interested in chewing for the sake of it—they're also drawn to the warmth and shelter insulation provides.
Adding more insulation does not always make a house warmer because insulation only slows heat transfer. Homes with major air leaks, moisture problems, unsealed rim joists, or empty wall cavities can still feel cold even with attic insulation rated at R-38 or R-49.
Upgrading to R60 attic insulation is highly beneficial if you live in a cold climate or want to maximize home comfort. However, due to diminishing returns, upgrading from an already solid R38 or R49 to R60 won't drastically lower your utility bills.
Blown-in (or loose-fill) insulation costs between $1.00 and $3.00 per square foot fully installed, averaging about $1,500 to $3,500 depending on the size of your space and the desired R-value. For a standard 1,500-square-foot attic, expect to pay roughly $2,300.
Blown-in insulation is not inherently toxic, but it can be highly irritating and potentially hazardous if inhaled or touched. Both fiberglass and cellulose materials release airborne particulates that cause temporary eye, nose, throat, and skin irritation. It can also severely trigger preexisting conditions like asthma.
Closed cell spray foam is rigid once set. It is a better thermal insulator and was previously sold to stabilise failing roofs. But if it has been used inappropriately or installed poorly, it might put stress on timbers, restrict air circulation and put them at risk of decaying.
Blown-in attic insulation should be 10 to 22 inches deep, depending on your local climate. The depth directly determines your insulation's "R-value" (its resistance to heat flow). For most U.S. climates, the Department of Energy recommends an R-value between R-38 and R-49.
Generally, yes, spray foam offers superior insulation compared to fiberglass. Here's why: spray foam offers a higher R-value. Simply put, the higher the R-value, the better the insulation. Spray foam boasts a significantly higher R-value per inch compared to fiberglass.
The total R-value of 12 inches of blown insulation ranges from R-26 to R-45, depending entirely on the material.
Yes, mice can chew through rockwool. While the dense, spun-stone fibers are not edible and are much harder to burrow into than soft fiberglass, a determined mouse will chew through rockwool to build nests or create pathways through walls.
1. Superior Energy Efficiency. Blown-in insulation effectively reduces heat loss in winter and heat gain in summer, leading to lower heating and cooling costs year-round. By minimizing air leaks, it prevents conditioned air from escaping, keeping your home at a consistent, comfortable temperature.
Yes, cellulose insulation significantly deters mice when compared to traditional materials like fiberglass. It acts as a physical and chemical barrier in a few key ways:
The healthiest, non-toxic insulation for your home is natural sheep's wool or hemp insulation. These materials contain no chemical binders or formaldehyde, actively regulate indoor humidity to prevent mold, and do not off-gas.
Potential problems with spray foam insulation
reduce air circulation and ventilation within a roof space. lead to dampness and condensation on the underside of a roof because it forms an air barrier and stops moisture from escaping. place timber-framed roofs at risk of decay.