The recommended R-value for an attic typically ranges between R-30 and R-60. The exact number depends heavily on your geographic climate zone and whether you are building new, adding to existing insulation, or retrofitting.
Depending on where you live and the part of your home you're insulating (walls, crawlspace, attic, etc.), you'll need a different R-Value. Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces.
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.
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.
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.
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.
To achieve an R-60 insulation value, you need between 17 and 24 inches of blown-in insulation, depending on the material you use. Because insulation settles over time, contractors usually blow it in slightly deeper than the minimum required thickness.
Yes, it's possible to over-insulate your attic, and doing so can create more problems than benefits. Over insulating an attic can block proper airflow and trap moisture. As a result, it can lead to mold growth, wood rot, and compromised structural integrity.
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.
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.
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.
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.
You can expect a finished attic to add 20% in increased value depending on several factors. Depending on the space size, the number of rooms, bathrooms, and more, the added value can increase. A local real estate agent can provide a more accurate estimate of the added value from your finished attic.
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. While you might think that too much insulation can't be bad, there are some significant consequences to consider.
The "best" attic insulation depends on your budget and whether you plan to use the space. For most traditional, vented attics, blown-in cellulose or fiberglass is best for the floor. For unvented attics or conditioned spaces, spray foam is superior.
Top Benefits of R30 in Roofing
Moisture Resistance: Polyisocyanurate insulation is inherently moisture-resistant, making it suitable for roofing applications where exposure to weather elements is a concern. This helps prevent mold growth and structural damage.
The Amish control mice through non-chemical, self-sustaining methods, relying on active trapping, natural scent repellents, and structural exclusion. Rather than using commercial poisons, they focus on physical barriers and natural predators to keep rodent populations in check.
While Rockwool (mineral wool) is highly valued for its thermal and acoustic properties, it has key disadvantages: higher costs compared to fiberglass, potential respiratory and skin irritation during installation, heavy weight making overhead handling difficult, and lack of biodegradability, which causes environmental concerns.
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.
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.
Removing old insulation might not be the sexiest home project, but it's one of the smartest. It gives you a chance to air seal, identify hidden issues, and build back better with materials that actually perform.
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.
Most regions fall into recommendations ranging from R30 to R60, with R49 and R60 representing the higher end of the spectrum. These premium R-values typically make sense in extreme climates or for homeowners prioritizing maximum energy efficiency.
Achieving an R-60 insulation value in your attic typically requires about 20 to 22 inches of blown-in cellulose or 22 to 24 inches of loose-fill fiberglass. The easiest and most cost-effective way to hit this mark is by air-sealing the attic floor and blowing in cellulose.