Blown-in insulation (also known as loose-fill) looks like a thick, fluffy blanket of fibrous material. It is designed to fill every nook, cranny, and crevice in attic floors and wall cavities.
Blown-in insulation lasts 20 to 30 years on average. While the material itself won't naturally expire, its effectiveness significantly degrades over time due to settling, moisture exposure, and pests.
Insulators also refer to it as “loose-fill” and “blown-in” insulation. Colors to look out for in these pebbles are grayish, brown, or silvery gold. If your home was built before the 1990s and contains this texture and color, it may contain zonolite or some variation.
Blown-in insulation is popular for filling irregular spaces, but it presents notable drawbacks like settling over time, poor moisture resistance, and messy maintenance. Proper attic ventilation is also required to prevent the material from shifting or clogging airways.
Spring (March – May): Moderate Demand, Competitive Pricing
Spring is a transitional period where insulation demand starts to decrease after the winter rush. Since contractors are not as busy as they were during peak winter months, you might be able to secure better pricing and quicker installation times.
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.
When balancing upfront cost and overall thermal efficiency, the cheapest and most effective standard insulation is fiberglass batt insulation. However, if you are looking for long-term savings through superior air sealing, dense-pack cellulose often provides the best overall value.
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.
Limited Energy Savings
Compared to insulating exterior walls or attics, insulating interior walls often provides less significant energy savings. The impact on your overall home energy efficiency may be minimal, especially if your home already has good exterior insulation and an efficient HVAC system.
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.
What are the Different Types of Blown-In Insulation? A Guide to Blown-In Insulation
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.
Effective wall coverings for cold walls include thermal insulation wallpaper (PE foam or cork), insulated lining paper, rigid foam boards, and thick acoustic panels to reduce heat loss and improve warmth. Popular solutions include Adhesive Thermal Insulation Wallpaper (3.28 x 32.8 ft) and 19. 7 in. X 16. 4 ft. Thermal Insulation Wallpaper, which offer easy installation for immediate improvement.
Messy Installation and Airborne Dust – The loose cellulose fibers blown into a home during the insulation process produce significant dust during installation, which can create a mess for homeowners.
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.
You absolutely can insulate interior walls, though it is rarely required by building codes. While not needed for primary energy efficiency like exterior walls, homeowners often add insulation for soundproofing, fire safety, or to create temperature-controlled zones (like isolating a home office or a rarely used guest room).
Convenient and cost effective, insulating cold walls from the inside is often done with panels or boards. While effective, the solution can be bulky and may reduce living space within your home. Another option is installing a thermally efficient coating over your interior walls.
The best overall choice for interior walls is mineral wool (stone wool), specifically products like Rockwool Safe'n'Sound. It is highly dense, providing exceptional sound dampening between rooms, superior fire resistance, and an easier, less-itchy DIY installation than standard fiberglass.
The Five Most Efficient Insulation Materials
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.
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.
If you are exploring alternatives to traditional fiberglass or spray foam insulation, the best options span natural, recycled, and high-performance synthetic materials. These choices improve indoor air quality, provide excellent sound dampening, and avoid the respiratory hazards associated with conventional materials.
What products are eligible? Typical bulk insulation products can qualify, such as batts, rolls, blow-in fibers, rigid boards, expanding spray, and pour-in-place. Products that air seal (reduce air leaks) can also qualify, as long as they come with a Manufacturers Certification Statement, including: Weather stripping.
6 Signs That You Need New Insulation in Your Home