It’s an important distinction when comparing mineral wool vs. fiberglass insulation derived from rockwool. The Department of Energy says that the average fiberglass contains 20 to 30 percent recycled material, while rockwool contains 75 percent recycled content, making it a more eco-friendly choice. Rockwool is generally more …Rockwool insulation is more durable than fiberglass Batt insulation. Fiberglass, unlike Rockwool, is neither water- nor fire-resistant and if exposed to water, ...May 6, 2012 ... On the other hand, the glass fibers melt in common structure fires - where the rockwool does not melt and maintains a fire break better. This ...Fiberglass insulation, rock wool, and slag wool insulation products installed to code levels in single-family homes save more than 100 times the amount of energy used to manufacture those products over a 20-year period. 1; ... Mineral wool insulation products vary by makeup. Rock wool insulation contains an average …Solid product, when it's a good product Unfortunately 1/3 of my purchase was mineral wool that was crumbling and falling apart. Can't return because there is a 120 day back order on the product. And I cannot delay my project another 3 months. Furthermore, no bulk discount and price increase of over $12/bag from just a few …The installed cost for R13 of spray foam insulation has been shown to be nearly 3-4 times as much for the same R-Value as fiberglass. 1 Additionally, spray foam insulation has a high cost of entry with required training and equipment. A spray foam rig can cost upwards of $70,000. Fiberglass insulation is the go-to …Learn about the four main types of home insulation products: fiberglass, mineral wool, cellulose, and spray foam. Find out how they perform, what they cost, and …Mineral wool insulation is about 10 percent more expensive than fiberglass insulation options. R-15 fiberglass insulation to fit a 4-inch wall will cost roughly $0.51 per square foot. R-15 fiberglass insulation to …(like mineral wool/fiberglass bats) without consulting with a knowledgeable person about the specifics of your space. If fiberglass batts or other vapor barriers are used, make sure the backing material/vapor barrier is facing towards the inside of the house to prevent moisture from accumulating. It is ok to use fiberglass in dry basements,When the temperature drops and the cold weather sets in, it’s important to keep your feet warm and cozy. One essential item that every woman should have in her winter wardrobe is a...Mineral Wool. While mineral wool was at one time the most common type of insulation, its market share was largely lost to fiberglass in the 1960s and 1970s. In the past few years, however, the product appears to have begun a comeback. There are currently several manufacturers of mineral wool in the U.S. and about eight plants that produce it.When it comes to surviving the harsh Canadian winters, having the right clothing is essential. One item that should be a staple in every Canadian’s wardrobe is a merino wool sweate...Here we examine rock wool vs. fiberglass properties to understand the similarities and differences between these two sound-deadening materials. ... Rock wool is made from rocks and is also known as mineral wool. This product is available in the same form as fiberglass. Rock wool is produced by heating rocks up to 3,000 °F, …Wrap-Up On Rockwool vs Fiberglass vs Mineral Wool Insulation So, when it comes to Rockwool, Fiberglass, and Mineral Wool insulation, each material has its unique strength and advantage. By assessing your specific requirements and considering the factors stated above, you can make an informed decision to go for …Jan 16, 2023 ... Leftover mineral wool insulation · 2 · Recommended Insulation For Finished Basement · 0 · How do I insulate the floor under my shed? 1 ...Mineral wool is also known as mineral fiber, mineral cotton, mineral fiber ... fiberglass, stone wool, and ceramic fibers makes ... ^ Jump up to: "Mineral Wool or ...Note 2: You need more budget to collect Rockwool while fiberglass needs less budget. Note 3: Rock wool is more environmentally friendly than fiberglass. Note 4: Cellulose has a higher R-value than fiberglass. It contains air holes which also help to absorb sound waves.Mineral wool by nature is stronger and DENSER since it is “ROCK” SLAG. The Lamba the ability to retain HEAT is a bit better lets say give Fiberglass a 7 and rock wool a 10…..Rock wool seems to do a little bit better with “diffusion” since it is denser and may just slowing things down a bit…perms for both are about the …Nov 18, 2013 ... Cost wise in my area it looks like stone wool is about 25% more than fiberglass(59 sq feet per pack versus around 78 for fiberglass, the ...Almondjoy247. • 6 yr. ago. As far as safety is concerned modern fiberglass is non cancerous and much less dusty than in the past. It even dissolves in your lungs. I don't remember explicitly, but I do believe mineral wool has similar functionality. The only major safety concern I would state is that many mineral wool suppliers use …Here we examine rock wool vs. fiberglass properties to understand the similarities and differences between these two sound-deadening materials. ... Rock wool is made from rocks and is also known as mineral wool. This product is available in the same form as fiberglass. Rock wool is produced by heating rocks up to 3,000 °F, …Spray Foam. 4 /7. Liquid sprayed-in foam offers a high R-value and can fit in supertight spaces when it dries hard, providing a perfect air barrier to keep your home cozy. This option can be more ...To help you decide which attic insulation material is right for your home, let’s compare cellulose and fiberglass insulation in 9 various aspects: 1. Thermal Performance. Cellulose: Offers a higher R-value, providing better thermal insulation. Fiberglass: Has a lower R-value, so thicker insulation may be required to achieve the same level of ...On a square-foot basis, mineral wool batts cost more than fiberglass batts. As an example, the R-15 mineral wool costs about 80¢ per sq. ft. vs. 60¢ for fiberglass. There are at least three brands of mineral wool batts for thermal wall insulation: Johns Manville TempControl, Roxul ComfortBatt and Thermafiber …On 2018-12-29 by (mod) - which is better: fiberglass or mineral wool for primary insulation. I don't think there is an objective right a wrong answer to your question although there may be specific advantages in one building insulation area shape or ease of application between the two products. Compare cost and R-value.Fiberglass. Fiberglass—one of the most common types of insulation—used to contain formaldehyde binding agents, which have mostly been phased out. But some forms of mineral-wool fiber insulation may still contain as much as 5 percent formaldehyde. The fibers from these forms of insulation pose inhalation risks, particularly during installation.Rockwool and Fiberglass have comparable sound absorption except for ~125 Hz where Rockwool performs much better. But I can buy 3x as much fiberglass than rockwool for the same price, covering nearly my entire room. Should I go for less of the better material or more of the cheaper option? Most studios I've seen aren't entirely …Fiberglass Insulation. The smart choice to make spaces more comfortable and energy efficient. R-Value. The ability to resist heat flow — insulation's thermal resistance. Thermal Properties. Ability to provide thermal resistance for comfort and efficiency. Insulating for Sound. Sound absorption characteristics, helping reduce noise transmission.R-Value is the measure of thermal resistance, which tells you how well your insulation will perform. Mineral wool and open cell spray foam both carry a similar R-value, between R3 to R4 per inch—while closed cell spray foam has a significantly higher thermal resistance, between R6 and R7 per inch. This means …R-Value is the measure of thermal resistance, which tells you how well your insulation will perform. Mineral wool and open cell spray foam both carry a similar R-value, between R3 to R4 per inch—while closed cell spray foam has a significantly higher thermal resistance, between R6 and R7 per inch. This means …Jan 12, 2022 ... Mineral Wool; Fiberglass. Characteristics: Cellular v. Fibrous. Cellular Insulation/Closed-Cell. Fibrous Insulation. Has a non-interconnected ...JM CladStone Water & Fire Block Mineral Wool. Manufactured from inorganic fibers derived from volcanic rock, Johns Manville CladStone™ Water & Fire Block Insulation is inorganic, noncombustible, moisture repellent and will not mildew or support corrosion. Data Sheet - CladStone 45. Data Sheet - CladStone 60. Data …Mineral wool has a higher R-value/inch than fiberglass, is more dense, and provides superior sound blockage. It also holds a more firm shape …Mineral Wool. Mineral wool actually refers to several different types of insulation: glass wool, fiberglass manufactured from recycled glass; rock wool, made from basalt or slag wool which is ...This one’s self-explanatory: mineral wool is better at insulation than most similar products on the market. It’s fibrous, dense, and specifically designed for maximum efficiency. Mineral cotton boasts a market-leading R-value per inch (R-15 and higher) which makes it an energy-efficient option. An eco-friendly product.Learn the pros and cons of mineral wool and fiberglass batts for residential wall and attic insulation. Compare thermal performance, sound control, fire resistance, moisture …Fiberglass. Fiberglass—one of the most common types of insulation—used to contain formaldehyde binding agents, which have mostly been phased out. But some forms of mineral-wool fiber insulation may still contain as much as 5 percent formaldehyde. The fibers from these forms of insulation pose inhalation risks, particularly during installation.Mineral wool is a superior insulation material in many ways compared to fiberglass insulation. It boasts a higher R-Value per inch than fiberglass- precisely- 22-37% improved R-Value. Additionally, mineral wool contains 70% recycled materials hence an environmentally friendly material compared to 20-30% recycled materials.Nov 18, 2013 ... Cost wise in my area it looks like stone wool is about 25% more than fiberglass(59 sq feet per pack versus around 78 for fiberglass, the ...The resulting mineral wool is an excellent insulator, which reduces your energy consumption and helps to prevent overheating in summer. Mineral wool is easy to install between joists and is more fire resistant than fibreglass insulation. Installing mineral wool insulation can help to improve the fire resistance of your property …Fiberglass is an inorganic material, and as such, is a noncombustible insulation material that is not flammable. The main issue that arises is that many people will apply vapor ret...Mineral wool is an excellent soundproofing material. Its high density and material composition make it good for acoustic performance. In addition, it has an open fiber matrix that helps it absorb sound waves. Compared to fiberglass, mineral wool is superior in thermal insulation, noise reduction, fire resistance, …If you check with the North American Insulation Manufacturers Association, they’ll assure you that fiberglass or mineral wool is definitely your best choice for attic insulation. Spray Foam Attic Insulation. Spray foam offers the best attic insulation performance available. Choose from two types: closed-cell and …Apr 8, 2014 · The author explains why mineral wool insulation is different from fiberglass insulation and why it is the best product for residential applications. He covers the advantages of mineral wool over fiberglass in terms of R-value, installation, air sealing, and vapor retarder. He also compares the products and availability of mineral wool in the U.S. market. The extreme density of Rockwool makes it heavy and unwieldy. Made from molten rock and steel residue, mineral wool is very tough and durable. The rock fibers can get embedded in the skin during installation, causing rashes and itchiness. Old and discarded mineral wool can be recycled to form new insulation products.Fiberglass repair is a common service that many people require at some point. Whether it’s for a boat, car, or any other fiberglass surface, finding reliable repair services near y...Jan 12, 2022 ... Mineral Wool; Fiberglass. Characteristics: Cellular v. Fibrous. Cellular Insulation/Closed-Cell. Fibrous Insulation. Has a non-interconnected ...Mineral wool offers higher R-values per inch compared to fiberglass, ensuring better thermal insulation. It contains approximately 70% recycled materials, making it an environmentally friendly choice. The high density of mineral wool contributes to its superior sound-deadening capabilities, providing enhanced acoustic insulation.The R-value of a batt of insulation is calculated by multiplying its thickness with the R-value per inch of the Rockwool material. For example: Taking 3.65 as the R-value per inch, a 5.2 inch thick Rockwool batt has an R-value of 19 (3.65 x 5.2 = 19 approximately). Ref: Insulation thickness calculator. Table of Contents.mineral wool would be the way to go. Fiberglass would work great too, maybe a good choice if this is not your forever home. In either case ...Jan 30, 2021 ... Mineral wool. Ceramic wool. It seems so far that Fiberglass is cheap but not as good as the other types, ... compared to Superwool Plus or ...STC Rating of Fiberglass vs Cellulose (Which one soundproofs the best) ... Fiberglass: 25: 50: Mineral Wool (Rockwool) 25: 50: Spray Foam: 75: 450: Mass Loaded Vinyl: 25: 250: Cellulose: 25: 50: Both cellulose and fiberglass have a very low flame spread index and smoke development rating. Just remember that cellulose is made out …The density of mineral wool makes it much heavier than fiberglass. When used as wall insulation this does not present a problem. Used in attics where it is likely resting on drywall screwed to the trusses or joists may cause weight problems. R-40 mineral wool insulation in an attic adds over 2lb. per square foot.Mineral Wool. Mineral wool insulation has a loose fill. It comes from recycled materials, such as blast furnace slag or a fine-grain rock. Installers can combine mineral wool with a liquid for spraying onto open walls. Mineral wool also works for blowing into wall cavities. This type of blow-in insulation can cause health hazards if it’s inhaled.Cost-effective. Fiberglass is generally cheaper compared to other insulation materials. Its batts and rolls, for example, range between $0.64 and $1.19 (including installation) while loose-fill costs …Fiberglass. Fiberglass—one of the most common types of insulation—used to contain formaldehyde binding agents, which have mostly been phased out. But some forms of mineral-wool fiber insulation may still contain as much as 5 percent formaldehyde. The fibers from these forms of insulation pose inhalation risks, particularly during installation.Thermal R Value In terms of insulating value, mineral wool carries an R-value of just above R4 per inch, meaning that it requires 3.5” to achieve R15. It …When it comes to cleaning your fiberglass shower, many people are concerned about using harsh chemicals that can be harmful to both their health and the environment. Fortunately, t...Fiberglass. Fiberglass—one of the most common types of insulation—used to contain formaldehyde binding agents, which have mostly been phased out. But some forms of mineral-wool fiber insulation may still contain as much as 5 percent formaldehyde. The fibers from these forms of insulation pose inhalation risks, particularly during installation.Mineral Wool vs. Fiberglass If you think mineral wool is better than fiberglass for acoustical value, you might be surprised. For both sound transmission and sound absorption, mineral wool and fiberglass are nearly identical. They both provide excellent solutions for acoustical performance, and the tiny differences are …The R-value of mineral wool is higher than that of fiberglass. In the US, mineral wool batts for 2x4 stud walls comes in R-15, while common fiberglass comes in R-11 or R-13 (excepcionally R-15); similarly, batts for 2x6 walls comes in R-23, while common fiberglass comes in R-19 (special ordered batts may come in R-21).Nov 1, 2021 · Looking ahead to insulating his new house, Wiscoguy says he’s planning to use an R-14 layer of exterior insulation along with mineral wool in the stud bays. But there’s a sticking point—cost. Quotes for fiberglass insulation have come in at about $10,000. Mineral wool (sold commercially by Rockwool and Knauf) would cost $16,000. Mineral wool insulation is one of the most common insulation options out there, but is it safe? Is it sustainable? Is mineral wool affordable? Is it a good i...Having read this thread I am concerned about the potential health hazards of mineral wool and fiberglass. Having looked at Bob Gold's list I see that Thermafleece is somewhat comparable to Owens Corning 703 above 500 hz, but much less absorbent in the lower frequencies. So perhaps it would work OK for cloud absorbers...Mineral Wool vs. Fiberglass: Factors to Consider Construction. The most important difference, at least as far as acoustic professionals, building managers, and installers are concerned, is the construction of mineral wool or fiberglass panels. Mineral wool is a loose material; it doesn’t hold a rigid or semi-rigid shape like fiberglass.Insulation Materials Specification Chart from the NIA National Insulation Training Program. This chart provides the reader with material properties as typically specified in ASTM material specifications and is a guide to performance characteristics but may not be sufficient for writing specifications. This was created by NIA for use by …Having read this thread I am concerned about the potential health hazards of mineral wool and fiberglass. Having looked at Bob Gold's list I see that Thermafleece is somewhat comparable to Owens Corning 703 above 500 hz, but much less absorbent in the lower frequencies. So perhaps it would work OK for cloud absorbers...An R-value tells you how well a type of insulation can keep heat from leaving or entering your home. Insulation R-values vary based on the type, thickness and density of the insulation material. Typically, a higher insulation R rating means better climate control and better energy efficiency for your home. A higher insulation R …For your insulation question- mineral wool SAFB is (Rockwool AFB, Owens Corning Thermafiber etc.) is always a great option if in budget. ... Nothing wrong with falling back on fiberglass insulation but mineral wool is money well spent if sound is a concern. My wall in my master between my twins room and ours is 4” SAFB, National Gypsum ...Mineral Wool. Mineral wool can create a highly effective thermal barrier in almost any climate and environment. Its open fibre structure allows it to hold a large amount of air, providing excellent heat regulation ability. Mineral wool also works great as a sound barrier for those living on a busy street. Mineral wool insulation costs $1.40 to ...ROCKWOOL ROXUL Safe® Fire safing insulation. ROCKWOOL ROXUL Safe® is a semi-rigid, mineral wool batt insulation designed to provide enhanced fire protection in ...Owens Corning Johns Manville ROCKWOOL Fiberglass Stone wool Mineral wool 15 15.25 15.5 16 19 19.25 23 23.62 23.75 24 47 48 93 10 20 30 40 60 90 100 120 130 150 160 180 190 240 Attic Basement Ceiling Crawlspace Floor Wall 5 4. ... Thermafiber Fire and Sound Guard Plus mineral wool insulation is designed to …ROCKWOOL is a company that manufactures stone wool insulation. Also known as mineral wool, stone wool is created by spinning molten rock and minerals with steel slag to create a cotton-candy-like wool product. Pressed into rolls and sheets, stone wool creates incredibly effective insulation with sound-absorbing and fire …Natural fibers are those that come from a plant, animal or mineral source. Cotton and linen are examples of plant fibers, while silk and wool come from animal sources. Asbestos is ...Mineral wool can contain basalt rock or recycled steel slag. Fiberglass insulation is less than 1/3 of the price of mineral wool insulation. When ordering fiberglass batts, the …Mineral Wool vs. Fiberglass If you think mineral wool is better than fiberglass for acoustical value, you might be surprised. For both sound transmission and sound absorption, mineral wool and fiberglass are nearly identical. They both provide excellent solutions for acoustical performance, and the tiny differences are …The five most common types are fiberglass, mineral wool, cellulose, polyurethane foam and polystyrene foam. Each has their benefits, but also negative factors. In comparison to aerogel insulation, one understands how those negative factors can out-weigh the benefits. 1. Fiberglass. Fiberglass is the most common insulation.Dec 13, 2022 · People will often choose fiberglass over mineral wool because it’s much cheaper and still effective. On average, mineral wool can be anywhere from 20% – 50% more expensive than fiberglass. 3 This is mainly due to the substantial manufacturing process mineral wool undergoes. And the cost is a major factor for many, as evidenced by the ... Mineral Wool vs. Fiberglass: Factors to Consider Construction. The most important difference, at least as far as acoustic professionals, building managers, and installers are concerned, is the construction of mineral wool or fiberglass panels. Mineral wool is a loose material; it doesn’t hold a rigid or semi-rigid shape like fiberglass.Mineral wool and fiberglass insulation are two widely used types of insulation in residential construction, with Owens Corning and Rockwool being the most popular brands. While both are referred to as mineral wool insulation, they are made from different minerals – one from stone or rocks and the other from glass. …All thickness combinations of Mineral Wool (MW) batts with 89mm Fiber Glass (FG) batts (with I-I single layer gypsum each side) gave lower STC assembly performance for MW batts. The greatest lowering (2 to 8 STC units) was for assemblies with a single layer of 5/8” Type X gypsum board on each side of the steel stud assembly.Glass wool is an insulating material made from glass fiber arranged using a binder into a texture similar to wool. The process traps many small pockets of air between the glass, and these small air pockets result in high thermal insulation properties. ... to produce glass. The fiberglass is usually produced by a method similar to …Almondjoy247. • 6 yr. ago. As far as safety is concerned modern fiberglass is non cancerous and much less dusty than in the past. It even dissolves in your lungs. I don't remember explicitly, but I do believe mineral wool has similar functionality. The only major safety concern I would state is that many mineral wool suppliers use …On a square-foot basis, mineral wool batts cost more than fiberglass batts. As an example, the R-15 mineral wool costs about 80¢ per sq. ft. vs. 60¢ for fiberglass. There are at least three brands of mineral wool batts for thermal wall insulation: Johns Manville TempControl, Roxul ComfortBatt and Thermafiber …There are many reasons to install a fiberglass shower in your bathroom. They’re easy to clean and maintain, they can change the look of your bathroom and they’re fairly inexpensive...Discover the various types of insulation and their performance characteristics. From mineral wool to foam plastic, sheep's wool, and wood fiber insulation, each type offers unique benefits for thermal efficiency, fire resistance, and noise reduction. Learn about their applications in residential and commercial buildings, as well as their respective thermal …MINERAL WOOL (Thermafiber, Roxul) FIBERGLASS (Owens Corning) FIBERGLASS (Owens Corning) R-stud® 1 + 1 Type X GWB Thermafiber/Roxul 50 STC R-stud® 1 + 2 Type X GWB Thermafiber/Roxul 52 STC R-stud® 2 + 2 Type X GWB Thermafiber/RoxulNatural fibers are those that come from a plant, animal or mineral source. Cotton and linen are examples of plant fibers, while silk and wool come from animal sources. Asbestos is ...Loose-fill fiberglass: R3.1: 16″-20″ Owens Corning Atticat Expanding Fiberglass Insulation: Loose-fill mineral wool: R3.1: 8″-12″ ROCKWOOL Stone Wool Insulation Granulate : Loose-fill cellulose: R3.4: 15″-20″ ThermoFloc Loose Fill Cellulose Insulation: Fiberglass batt: R2.5: 20″-26″ Owens Corning Kraft Faced …Mineral wool offers higher R-values per inch compared to fiberglass, ensuring better thermal insulation. It contains approximately 70% recycled materials, …
The extreme density of Rockwool makes it heavy and unwieldy. Made from molten rock and steel residue, mineral wool is very tough and durable. The rock fibers can get embedded in the skin during installation, causing rashes and itchiness. Old and discarded mineral wool can be recycled to form new insulation products.. Best websites for free movies
Fiberglass insulation has a density of about 0.5 to 1.0 pounds per cubic foot, allowing it to reduce sound by 4 to 10 decibels. Rockwool insulation has a density of around 1.7 pounds per cubic ...When it comes to comfort and warmth, few materials can match the cozy embrace of wool. That’s why wool house slippers have gained popularity among those seeking a luxurious and com...Mineral Wool Panels vs Fiberglass Panels. Mineral wool (2” thick) panels have an STC between 45 and 52, and an NRC range from 0.95 to 1.09. They work well in walls and as panels to absorb sound, reverberation, and echo. Fiberglass (2” thick) panels have an STC of 44 and an NRC of 0.50 to 0.95 …When it comes to comfort and warmth, few materials can match the cozy embrace of wool. That’s why wool house slippers have gained popularity among those seeking a luxurious and com...Fiberglass repair is a common service that many people require at some point. Whether it’s for a boat, car, or any other fiberglass surface, finding reliable repair services near y...Mineral wool batts and blown cellulose are heavier than fiberglass batts and blown fiberglass. Tradeoff considering the cost and labor of beefing up your ceiling joists. Mineral wool batts are not cheap, either (tho I like them for the initial layer or for walls where R-value/inch matters). I would reuse the fiberglass batts you remove.A: Glass wool and mineral wool insulation are two types of thermal insulation materials. The main difference lies in the composition of the fibers used. Glass ...If you’re considering installing a pool in your backyard, fiberglass pool shells offer a durable and low-maintenance option. However, the cost of a new pool can be quite expensive....MINERAL WOOL (Thermafiber, Roxul) FIBERGLASS (Owens Corning) FIBERGLASS (Owens Corning) R-stud® 1 + 1 Type X GWB Thermafiber/Roxul 50 STC R-stud® 1 + 2 Type X GWB Thermafiber/Roxul 52 STC R-stud® 2 + 2 Type X GWB Thermafiber/RoxulROCKWOOL is a company that manufactures stone wool insulation. Also known as mineral wool, stone wool is created by spinning molten rock and minerals with steel slag to create a cotton-candy-like wool product. Pressed into rolls and sheets, stone wool creates incredibly effective insulation with sound-absorbing and fire …Jul 29, 2023 ... Wrong on all counts - Rockwool (when sold/used for insulating a loft) has the same thermal performance as fibreglass. Fibreglass insulation is ...Wrap-Up On Rockwool vs Fiberglass vs Mineral Wool Insulation So, when it comes to Rockwool, Fiberglass, and Mineral Wool insulation, each material has its unique strength and advantage. By assessing your specific requirements and considering the factors stated above, you can make an informed decision to go for …When it comes to surviving the harsh Canadian winters, having the right clothing is essential. One item that should be a staple in every Canadian’s wardrobe is a merino wool sweate...The density of mineral wool makes it much heavier than fiberglass. When used as wall insulation this does not present a problem. Used in attics where it is likely resting on drywall screwed to the trusses or joists may cause weight problems. R-40 mineral wool insulation in an attic adds over 2lb. per square foot.The primary difference in rock wool vs. fiberglass is that rock wool wins hands down as being far more expensive than fiberglass.Sep 30, 2021 ... Fiberglass insulation has a density of about 0.5 to 1.0 pounds per cubic foot, allowing it to reduce sound by 4 to 10 decibels. Rockwool ...R.I.P. Joined 2006. 2012-11-24 11:39 am. #3. The best stuffing material for sealed boxes is fiberglass. It has been shown in test after test. It does the best job of enhancing box volume (lower bass) and damping of reflections off the rear wall. My rule of thumb is use about 1 lb per cu. ft of volume to stuff.The extreme density of Rockwool makes it heavy and unwieldy. Made from molten rock and steel residue, mineral wool is very tough and durable. The rock fibers can get embedded in the skin during installation, causing rashes and itchiness. Old and discarded mineral wool can be recycled to form new insulation products..