Blown-in attic insulation should generally be 10 to 14 inches deep to achieve an R-38 value, or up to 16 to 18 inches deep to reach an R-49 value. The exact depth depends on your local climate, whether you are using cellulose or fiberglass, and if you are topping off existing insulation.
R-Value is a measure of insulation's ability to resist heat flow. 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.
The 7 and 7 rule for attic conversions refers to the common requirement that finished attics be at least 7 feet wide and 70 square feet, with 7-foot ceilings over at least half. Keep in mind that this is a general guideline. Local building codes may have stricter requirements that supersede this rule.
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.
While having a deep layer of blown-in insulation is excellent for your energy bills, you can put too much in if it blocks your attic's ventilation. Piling too much insulation over your eaves and soffit vents restricts the airflow needed to control moisture, which can eventually lead to wood rot, mold, and roof damage.
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.
Looking across your attic, if the insulation is level with or below the attic floor joists, you probably need to add more insulation. If you cannot see any of the floor joists because the insulation is well above them, you probably have enough, and adding more insulation may not be cost-effective.
Closed-cell spray foam and rigid foam board are hard, unattractive to rodents, and double as air barriers. Mineral wool is dense enough to discourage nesting. Fiberglass batts, especially in crawl spaces and attics, are essentially an open invitation.
The Amish rely on natural, low-tech, and self-sufficient methods to manage mice. Because they generally avoid chemical poisons, they focus on three core pillars: prevention, natural deterrents, and mechanical traps.
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.
In most cases, mice are nocturnal, which means they usually remain in their nest during the day. A mouse can venture out at night to search for food. If a mouse has been disturbed and feels uncertain or threatened, it may move out of the attic during the day.
While both types provide insulation, R30 is the better option for maximizing energy savings in areas where heat loss or gain is a major concern. For example, R19 may suffice for interior walls, but R30 is more appropriate for exterior-facing attics or floors.
You will MOST LIKELY need a building permit if your attic remodel involves: Creating a “habitable space”: Converting an unfinished attic into a bedroom, office, playroom, or any other living area almost always requires a permit.
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.
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.
To prepare your attic for blown-in insulation, prioritize air sealing, adequate ventilation, and safety:
Yes, Amish people bathe regularly, though the frequency and methods vary significantly depending on the season, how physically active they are, and the strictness of their specific church district.
Several common human foods and ingredients are highly toxic to mice. Understanding these is important for the safety of pet mice or for keeping these items out of reach in households. The most notable include:
Amish wedding nights prioritize community, tradition, and practicality over the modern idea of a private honeymoon. On their wedding night, the bride and groom typically return to the bride’s parents' home, where the newlyweds must wake up early the next morning to help clean the house after the large celebration.
Here's the reality: if you see one mouse during the day, there are likely 5-10 more you're not seeing. In other words, daytime sightings almost always indicate multiple mice. Even nighttime sightings suggest more than one. Mice are social animals that live in family groups.
Because spray foam can trap moisture, hide the condition of the roof, make it difficult for surveyors to inspect, which means risks like timber decay, dry rot, and not forgetting increased fire risk. If you've got it or you're buying a property that does, this is something you need to know upfront.
While technically possible, it is very uncommon for mice to crawl on you while you sleep. Mice are naturally skittish, nocturnal creatures that prefer to avoid humans. However, they may do so if it serves as a direct shortcut to their nest or if there is food (like crumbs) in your bed.
Signs of poor attic ventilation include trapped excessive heat, condensation buildup, and accelerated wear on your roof. Left unchecked, this can lead to expensive roof repairs, skyrocketing energy bills, and structural damage.
How to Replace Attic Insulation Safely and Effectively
Poor insulation forces your HVAC to work overtime, resulting in skyrocketing energy bills, uneven room temperatures, and drafty areas. Look for warning signs like cold walls, frozen pipes, and frequent condensation or mold growth, which indicate moisture is collecting on uninsulated surfaces.