Mineral wool (often called rock wool) is generally superior to fiberglass in thermal performance, fire resistance, and soundproofing, though fiberglass is much more budget-friendly.
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.
Mice do not like rockwool insulation in the way they like fiberglass—its dense, fibrous mineral makeup is abrasive and unpalatable, meaning they cannot easily eat it for nourishment. However, it is not rodent-proof. Because rockwool is warm and mold-resistant, mice will still happily chew through it to create soft, insulated nests.
Mineral wool insulation provides excellent fire resistance and soundproofing, but it is 252525-50% more expensive than fiberglass and can cause severe skin and respiratory irritation during installation. Because it is dense, it requires specialized cutting tools, and it readily absorbs moisture if exposed to open air.
What time of year is Insulation cheapest?
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.
Whether you need a vapor barrier depends on your local climate zone and the specific building assembly. Mineral wool (e.g., Rockwool) is highly vapor-permeable. It allows moisture to pass through, meaning a separate vapor barrier may be required by local building code or climate.
Mineral wool itself does not mold because it is an inorganic material (made of rock and slag) that provides no food source for mold spores. However, if exposed to constant moisture, mold can grow on the dust and organic debris that accumulates on the insulation's surface.
Material Type 1: Fiberglass
Laying fiberglass batts is the easiest method for a DIY job. Loose-fill fiberglass insulation requires the use of a blowing machine that you can rent from a home improvement store.
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.
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.
Loose Fill Fiberglass
As the name suggests, this is a loose insulation that you'll need to blow into your walls using a special machine. Because it's a loose material that tends to fall in on itself, loose fill fiberglass insulation is less appealing to rodents and pests than other types 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 Environmental Protection Agency banned spray-on asbestos insulation in 1973, certain types of pipe and block insulation in 1975 and new asbestos insulation products in 1989. In 2024, the EPA banned most uses of chrysotile asbestos products, including imports.
Much like fiberglass insulation, mineral wool sheds slivers of material that can affect the skin. Anyone who inhales those slivers may develop lung damage as a result. For this reason, installers must wear protective clothing and face protection when handling the insulation.
According to some sources, Rock Wool may have also manufactured asbestos insulation in the past. But current forms of rockwool insulation, regardless of the brand, do not contain asbestos.
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.
Mineral wool (often called Rockwool or slag wool) and fiberglass are both effective insulators, but mineral wool is denser, provides superior soundproofing, and resists fire and moisture better. Fiberglass is lighter, significantly cheaper, and easier for beginners to cut and install.
Mineral wool fibres are also elastic and have the ability to interlock with each other, creating a dense structure. Because of this, mineral wool does not require a dedicated air gap or air cavity to perform its insulating function—unlike reflective insulation, which often needs an air space to be effective.
The cheapest insulation for a ceiling is fiberglass batt or roll insulation, which typically costs around ** $0.40 to $0.75 per square foot**. If you have an unfinished attic and open joists, blown-in cellulose is another highly affordable, DIY-friendly option with comparable pricing.
It takes time for your home to warm up and cool down. If you're not sure how long it takes, try turning the heating on about 30 minutes before you need it. You should turn it off 30 minutes before you'll stop needing it.
Block out any drafts
Use draft excluders at the base of doors and check for gaps around windows where cold air might be able to creep in. If needed, you could also think about investing in some thermal curtains to help block out drafts and retain more heat in your bedroom.
The most effective way to insulate walls without removing drywall is the "drill and fill" method. Installers drill small holes in the drywall or siding, blow in dense-pack cellulose or inject expanding foam into the cavities, and patch the holes, leaving your interior mostly intact.