You only need faced insulation in an attic if you are doing a new installation and require a vapor barrier. The paper facing acts as a moisture barrier to prevent warm, humid air from your living space from condensing inside the insulation.
Choose unfaced insulation for the majority of attic projects. Use faced only when adding a single, new layer directly against ceiling drywall or in new construction without existing insulation.
In an attic, the paper or foil facing (vapor barrier) should always face downward against the warm ceiling of the living space. The pink or yellow fiberglass should be visible when you are standing in the attic, and the paper side should be touching the drywall/ceiling below.
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.
Unfaced insulation is generally cheaper than faced insulation, as it lacks the extra vapor retarder material (kraft paper or foil).
Faced or unfaced insulation in basement walls is a common question we get. Use faced insulation in basement walls when insulating between studs, with the facing toward the interior. However, if you're adding insulation over existing insulation, choose unfaced to avoid creating a double vapor barrier.
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.
Batt Insulation:
Also, when laying down additional insulation, work from the perimeter toward the attic opening. Never lay insulation over recessed light fixtures or soffit vents. Keep all insulation at least 3 inches away from recessed "can" lights, unless they are rated IC (Insulated Ceiling).
Again, the off-gassing here can be a big problem. There are other types of insulation, but these are the most common. The best non-toxic insulation is either mineral wool or foam insulation inserts.
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.
Don't Over-Insulate
Believe it or not, it's possible to have too much insulation. Overdoing it can be a mistake, as each material has a recommended R-value based on your climate. Too much insulation can cause moisture issues and lack of ventilation, which can lead to mold growth and reduce indoor air quality.
What time of year is Insulation cheapest?
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.
In most cases, you do not need to remove old insulation before adding new insulation. Laying new batting or blown-in insulation directly over existing material is often the most cost-effective way to boost your attic's energy efficiency, provided the old insulation is in good condition.
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.
Yes, you can install unfaced insulation over existing faced insulation. In fact, it is the standard and recommended method for adding a second layer of insulation.
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.
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.
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.
Skin & eye irritation: Contact with insulation can send irritating particles into the air, which can irritate the eyes and skin. Lung irritation: Fiberglass insulation particles can create respiratory problems if inhaled.
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.
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.
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.
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.
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.