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Homasote

Homasote is a brand of engineered structural fiberboard composed primarily of over 98% recycled cellulose fibers derived from paper, combined with a wax emulsion for moisture resistance and other additives for enhanced performance, serving as a versatile, eco-friendly building material for applications including soundproofing, insulation, and sheathing.^[1] Founded in 1909 by Eugenius H. Outerbridge as the Agasote Millboard Company in New Jersey, Homasote represents the oldest U.S. manufacturer of building products made from recycled materials, operating from a 600,000-square-foot facility that processes 100 tons of cellulose fiber daily and conserves approximately 750,000 trees annually.^[2] In 1916, the company introduced its flagship "Versatile Homasote Board" for weather-resistant uses, and by 1925, it rebranded as the Homasote Company, shifting focus to insulation and construction products.^[2] Key innovations include the 1935 "Precision Built System" for modular housing, wartime contributions to military projects during World War II, and the 1980s launch of the 440 SoundBarrier, a high-density board specifically designed for acoustic control in walls, floors, and ceilings.^[2] More recent developments feature products like PINnacle, a sanded, tackable interior panel, and fire-retardant variants such as the 550 and NCFR boards, which incorporate hydrated alumina to reduce flammability and smoke.^[2]^[1] Homasote's environmental credentials are central to its identity, with products containing 98% recycled content that diverts over 30 million pounds of solid waste from landfills each year, and the company pioneered a closed-loop water recycling system in the U.S. in 1956.^[3]^[2] These boards are non-toxic, resistant to mold, termites, and fungi, and contribute to green building standards, including LEED certification, while offering practical benefits like lightweight handling, ease of cutting, and an R-value of approximately 1.2 for thermal insulation in standard 1/2-inch thicknesses.^[3]^[1] Beyond construction, Homasote extends to sustainable packaging solutions like PAK-LINE, underscoring its commitment to reducing environmental impact across industries.^[2]

History

Founding and Early Development

Homasote traces its origins to 1909, when industrialist Eugenius H. Outerbridge founded the Agasote Millboard Company in West Trenton, New Jersey, as an offshoot of his Bermuda Trading Company ventures. Outerbridge, a prominent entrepreneur with interests in shipping and manufacturing, acquired a secret process from England for producing high-density fiberboard from wastepaper, establishing the company on the site of an abandoned paper mill to capitalize on local resources. The initial focus was on creating durable, lightweight panels as sustainable alternatives to traditional wood products, addressing the growing demand for efficient materials in transportation and construction.^[2]^[4]^[5] From its inception, the Agasote Millboard Company produced sanded panels primarily for lining railroad carriages and later automobile tops, leveraging the material's water-resistant and structural qualities derived from compressed cellulose fibers. These early products marked a pioneering shift toward recycled content in building materials, utilizing wastepaper to form a dense hardboard that could be worked like wood but offered superior lightness and durability. By 1915, the panels had gained traction in automotive applications, including models from Ford and Buick, demonstrating the company's early adaptability and Outerbridge's vision for eco-friendly industrial innovation.^[2]^[4]^[6] In 1916, the company introduced the Homasote brand board, an unsanded, versatile panel explicitly manufactured from recycled newspaper, which solidified its reputation as a leader in sustainable fiberboard production. This product, initially promoted for its weather-resistant properties, represented a refinement of the original process, emphasizing repulped newsprint as the core ingredient to create strong yet lightweight sheets suitable for broader applications. The innovation aligned with Outerbridge's commitment to resource conservation, positioning Homasote as an early advocate for recycling in manufacturing.^[2]^[6]^[4] The company's evolution culminated in 1925 with its renaming to the Homasote Company, reflecting a strategic pivot toward emphasizing the building and insulation potential of its flagship product over transportation uses. This rebranding underscored nearly two decades of development under Outerbridge's leadership, transforming a niche millboard operation into a cornerstone of recycled building materials.^[2]^[5]

Key Milestones and Historical Uses

During World War I, Homasote panels were employed by U.S. military officials for the construction of field hospitals and military housing in France, valued for their weather resistance, soundproofing capabilities, and insulating properties that provided effective barriers against environmental extremes and noise in temporary medical facilities from 1917 to 1918.^[2] In the late 1920s, the product's lightweight and insulating qualities led to its selection for high-profile expeditions; notably, Admiral Richard E. Byrd incorporated Homasote panels into the structures at his winter headquarters during the 1928-1930 Antarctic expedition, where they served as soundproofing and thermal insulation in the harsh polar conditions.^[2] As the United States prepared for potential conflict in the late 1930s, Homasote played a role in innovative pre-war housing initiatives demonstrating rapid modular construction. In 1935, under the company's "Precision Built System of Construction," 977 homes were erected in Vallejo, California, within just 73 days, showcasing the material's efficiency for large-scale, affordable housing projects that foreshadowed wartime needs.^[2] World War II further expanded Homasote's applications in urgent defense-related builds, including barracks and facilities at the Kodiak Naval Base in Alaska from 1939 to 1940, and a massive 1942 project at the Norfolk Naval Shipyard where 5,000 homes were completed in under six months to accommodate naval personnel.^[2] Following World War II, Homasote panels were used in the construction of radar sites along the Distant Early Warning (DEW) line in the Arctic, providing insulation and structural support in extreme cold environments during the Cold War era.^[2] By the mid-20th century, Homasote introduced enhanced variants, including weather-resistant and structural grades, building on the original 1916 formulation to meet evolving demands for durable, multi-purpose building materials in both residential and industrial settings.^[2] In the 1950s, Homasote earned recognition as the oldest U.S. manufacturer of recycled building products, highlighted by a 1956 award from the U.S. Army Corps of Engineers for pioneering water recycling in production processes, underscoring its early commitment to sustainable manufacturing practices.^[7]^[2]

Composition and Manufacturing

Materials and Ingredients

Homasote is primarily composed of recycled cellulose fibers derived from post-consumer paper and newspaper, which form the structural backbone of the board.^[2] These fibers account for more than 98% of the board's content, making Homasote a non-wood fiberboard akin to a rigid form of papier-mâché.^[8] The company processes up to 100 tons of this recycled material daily, diverting it from landfills and conserving natural resources.^[9] To enhance durability, small amounts of additives are incorporated during production. A wax emulsion is added to provide moisture resistance by coating the fibers; the wax comprises 2% paraffin wax.^[10] Additional processing aids include a retention aid polymer to improve water drainage and fiber retention, and aluminum sulfate (alum) to separate the wax for deposition on the fibers.^[8] A biocide such as copper metaborate (less than 0.1%) is included to protect against termites, rot, fungus, and mold.^[11] In certain variants like fire-rated boards (e.g., Homasote 550), further additives such as aluminum trihydrate (30-40%) and starch (1-6%) are used to improve fire resistance and strength, while the cellulose content ranges from 50-60%.^[12] The manufacturing begins with these materials in a hydrapulper, where post-consumer paper is mixed with hot water (18,000 gallons at 140°F) to create an initial slurry consisting of 98% water and 2% pulp.^[2] The distinctive gray color of the final product originates from the ink in the recycled newsprint.^[2] After processing, the finished boards retain approximately 5% moisture content.^[2] Homasote contains no asbestos, formaldehyde, urea, phenolic additives, or toxic adhesives, ensuring it is free of harmful substances commonly found in other building materials.^[9] This composition emphasizes sustainability, with nearly all fibers sourced from post-consumer waste, though specific formulations may vary slightly across product lines like 440 SoundBarrier or NCFR boards.^[8]

Production Process

The production of Homasote boards takes place at the company's 600,000 square foot manufacturing facility in West Trenton, New Jersey, which has been operational since 1909. In 1956, the facility implemented a closed-loop water recycling system that reuses hundreds of thousands of gallons daily, a innovation recognized by the U.S. Army Corps of Engineers.^[2]^[13] The process begins with the delivery of tons of post-consumer recycled paper and newspaper, from which cardboard is separated and resold. The paper is then pulped in a hydrapulper measuring 13 feet deep and 20 feet wide, using 18,000 gallons of water heated to 140°F to form a slurry of 98% water and 2% pulp; at this stage, a wax emulsion and biocide are added.^[2] This slurry is pumped into 8 by 12 foot molds, where nearly 25% of the water is expelled.^[2] The mat is subsequently pressed at 1,600 to 2,200 pounds per square inch to attain the necessary density and structural integrity.^[2] The pressed material is then dried in a 300-foot enclosed dryer until the moisture content reaches approximately 5%, after which the boards are cut to standard dimensions, such as 4 by 8 foot sheets in thicknesses from 1/4 to 1/2 inch.^[2]^[14] This manufacturing method enables the recycling of up to 100 tons of cellulose fiber daily, conserving approximately 750,000 trees annually.^[2]

Physical and Acoustic Properties

Mechanical and Structural Characteristics

Homasote boards exhibit a density ranging from 25 to 40 pounds per cubic foot, depending on the product variant, which contributes to their lightweight nature while providing adequate structural integrity for applications such as sheathing and underlayment.^[15]^[16] The material demonstrates tensile strength parallel to the surface of 200 to 700 psi and modulus of rupture values up to 1,100 psi, enabling it to serve as a structural component in building assemblies.^[15]^[16] Hardness, measured by the Janka ball test, reaches a minimum of 230 to 275 pounds, supporting its use in load-bearing scenarios without excessive deformation.^[14]^[16] Standard dimensions for Homasote sheets include 4 feet by 8 feet panels, with thicknesses typically from 3/8 inch to 3/4 inch, though 1/2-inch variants are most common.^[15]^[16] These boards weigh approximately 1 pound per square foot for 1/2-inch thickness in standard formulations, increasing to about 1.5 pounds per square foot for higher-density options, facilitating handling during installation.^[15]^[16] Homasote offers excellent workability, allowing it to be cut, drilled, and shaped using standard woodworking tools without splintering, though cutting produces fine dust requiring appropriate personal protective equipment and ventilation.^[14]^[17] It provides strong nail-holding capacity, with fasteners driven directly into the surface holding securely due to the dense fiber matrix, and it resists splitting under mechanical stress.^[18] Durability is enhanced by integral treatments with biocides such as copper metaborate, rendering the boards resistant to termites, rot, and fungal growth, even in humid environments.^[14]^[16] When properly sealed or coated, Homasote exhibits weather resistance suitable for protected exterior use, maintaining structural performance over time.^[16] Visually, Homasote is identifiable by its uniform gray to gray-tan coloration and homogeneous, non-layered cross-section, which lacks the visible grain or delamination seen in wood-based panels.^[6] The surface often displays subtle manufacturing-induced patterns from the compression process, contributing to its distinctive texture.^[6]

Sound and Thermal Insulation Performance

Homasote exhibits strong acoustic performance, particularly in reducing airborne and structure-borne noise transmission in building assemblies. When used as a sound barrier, such as in the 440 SoundBarrier product, it achieves Sound Transmission Class (STC) ratings of 50 or higher in wall, floor, and ceiling configurations, with specific assemblies reaching STC 55 when installed as a single layer decoupled from gypsum board in metal-stud walls filled with fiberglass or mineral wool insulation.^[11]^[19] Its noise reduction coefficient (NRC) is 0.20, contributing to effective dampening of ambient sounds in residential and commercial settings.^[20] For thermal insulation, Homasote provides moderate heat retention with an R-value of approximately 2.4 per inch of thickness, calculated from tested values of R-1.2 for 1/2-inch boards and scaling proportionally for thicker variants like 5/8-inch (R-1.33) and 3/4-inch (R-1.4).^[20] This performance, roughly twice that of solid wood, supports its use in energy-efficient envelopes while maintaining structural integrity.^[14] Certain Homasote formulations, such as those treated with fire-retardant chemicals like NCFR Homasote, achieve a Class A fire rating with a flame spread index of 25, meeting UL standards for low flame propagation and self-extinguishing behavior in interior applications.^[21] Untreated variants, including 440 SoundBarrier, are rated Class C with higher flame spreads (76-200), suitable for non-critical fire zones.^[20] Homasote handles moisture through absorption and vertical wicking, with a maximum water uptake of 7% by volume after 2-hour immersion and minimal expansion (0.25%) under humidity cycles from 50% to 90%, rendering it resistant to mold, rot, and fungi but prone to softening if fully saturated.^[20]^[14] Early laboratory tests in the 1930s confirmed its sound control efficacy, building on anecdotal evidence from prior decades and establishing its role in noise reduction for buildings.^[22]

Applications

Building and Construction Uses

Homasote serves as a versatile material in wall and ceiling applications within residential and commercial construction, primarily as soundproofing barriers, tackable panels, and decorative coverings. Products like 440 SoundBarrier are installed directly on framing in room partitions and peripheral walls to attenuate noise transmission, offering superior sound control compared to traditional gypsum board when used in recommended assemblies.^[14] As tackable panels, Homasote boards, such as the 1/2-inch or 5/8-inch thick varieties in 4-foot by 8-foot sheets, function as bulletin boards or substrates for fabric wrapping in educational and institutional settings, where their fibrous composition allows pins and tacks to penetrate easily without damage.^[23] For decorative purposes, these panels provide a smooth, paintable surface that enhances aesthetics while contributing to acoustic comfort in interiors.^[24] In sheathing and underlayment roles, Homasote provides structural support and noise reduction in floors and exterior walls. As resilient underlayment, 440 SoundBarrier is applied over wood or concrete subfloors beneath finished flooring like carpet or hardwood, with joints gapped 3/16 to 3/8 inches and secured using APA-approved adhesives and nails, effectively dampening impact and airborne sounds.^[23] For exterior wall sheathing, panels are installed vertically on framing spaced up to 24 inches on center for 5/8-inch thickness, nailed at 4 to 6 inches along edges, serving as a nailable base for siding while offering incidental thermal insulation with an R-value approximately double that of wood.^[23]^[14] Homasote products are employed in roof insulation, particularly as fire-retardant thermal barriers in roofs and attics. FireStall roof decking, a UL Class A fire-rated structural board, functions as nailable insulation over steel joists or wood framing, providing both thermal resistance and fire protection in cathedral ceilings and flat roofs.^[25] Easy-Ply roof deck, a multi-ply high-density variant, is used similarly for weather-resistant applications, installed with grooves down and secured by screws to ensure durability in exposed conditions.^[25] Historically and in modern contexts, Homasote has been integrated into modular and prefabricated housing for insulation and structural elements. In the 1930s, the company developed the Precision-Built system, using Homasote panels in factory-assembled wall sections for rapid on-site assembly, as demonstrated in early developments and wartime projects like the U.S. Navy housing in Portsmouth, Virginia.^[2]^[26] Today, it continues in multi-family prefab constructions for sound control and sheathing, supporting quick-assembly homes without compromising performance.^[27] Homasote meets relevant building codes for these non-structural interior panels and sound-rated assemblies, including compliance with the International Building Code (IBC) and California Building Code (CBC) Chapter 12 for insulating boards, as verified by ICC-ES Evaluation Report ESR-1374.^[10] Fire-retardant products such as NCFR Homasote and FireStall roof decking achieve Class A fire ratings per ASTM E84 and UL 723, with flame spread of 25 and smoke developed of 20, while standard products like 440 SoundBarrier have Class C ratings but contribute to UL fire-resistance-rated assemblies.^[23]^[28]

Specialized and Niche Applications

Homasote has found significant application in model railroading as a roadbed material for layouts, valued for its sound absorption properties that reduce operational noise and its ability to securely hold spikes and nails without splintering.^[29] This makes it particularly suitable for hand-laid tracks and detailed hobbyist constructions, where its lightweight and easy-to-cut nature facilitates custom shaping with a mat knife or saw.^[29] In industrial packaging, Homasote's PAK-LINE division produces custom protective solutions from recycled fiberboard, designed for shipping fragile items such as auto parts, glass, refrigerators, and metal coils.^[30] These products offer shock absorption, reusability, and moisture resistance, with features like adjustable side walls for securing auto glass racks or interlocking containers for single-person assembly in under 10 minutes.^[31]^[32] For acoustic treatments, Homasote 440 SoundBarrier panels serve as effective sound barriers in recording studios, theaters, and home theaters, reducing airborne and impact noise transmission when installed in walls, floors, or ceilings.^[18] Laboratory-tested per ASTM C208 standards, these structural boards provide resilient underlayment and are commonly used in UL fire-rated assemblies for professional audio environments.^[18] Beyond these, Homasote has been employed in temporary field structures, including U.S. Army field hospitals in France during World War I and barracks at Kodiak, Alaska, for the U.S. Navy in 1939-1940.^[2] In Antarctic expeditions, it formed panels for Admiral Richard E. Byrd's 1928-1930 base at Little America, covering exteriors, roofs, and insulating internal walls of facilities like labs, bunkhouses, and mess halls; a 1947 inspection revealed the material remained unharmed after 18 years of exposure to extreme cold and moisture.^[2] In modern green building, Homasote accents, such as PINnacle panels, enhance sustainable interiors and protected exteriors with their formaldehyde-free, tackable surfaces made from 100% recycled content.^[33] Homasote products are widely available through building supply stores, lumber yards, and home centers via a dealer locator, with custom cuts and sizes offered by select retailers for niche project needs.^[34]^[35]

Environmental Impact and Sustainability

Recycling and Eco-Friendly Aspects

Homasote products are manufactured using high levels of post-consumer recycled paper, primarily sourced from newspapers and waste paper, with content ranging from 44% to 98% depending on the product, which diverts over 30 million pounds of material from landfills annually, equivalent to up to 100 tons per production day.^[2]^[36] This recycling process also contributes to substantial resource conservation, helping to save over 1.37 million trees each year by reducing the demand for virgin timber.^[9] The company's manufacturing employs a closed-loop system implemented in 1956, which recycles all process water, dust, scrap, and product rejects, thereby minimizing waste generation and energy consumption while eliminating nearly all liquid and solid effluents from the production stream.^[13] This innovative approach, recognized by the U.S. Army Corps of Engineers, processes hundreds of thousands of gallons of water daily without external discharge, further enhancing operational efficiency and environmental stewardship.^[9] Homasote holds several certifications underscoring its eco-friendly profile, including recognition as a qualifying material under the U.S. Green Building Council's LEED program due to its high recycled content and sustainable production methods.^[36] Products are also FSC-certified for responsible sourcing of reclaimed materials and are fully recyclable at end-of-life, allowing them to re-enter the paper recycling stream.^[37] As a pioneer in recycled building products since its founding in 1909, Homasote has maintained a legacy of environmental innovation, becoming one of only two global manufacturers of structural products from post-consumer waste paper.^[13] This focus results in a low carbon footprint, with production using up to 70% less energy than processes relying on virgin wood pulp, and it avoids synthetic additives that could increase embodied energy in comparable boards.^[9]

Advantages and Limitations in Use

Homasote offers several practical advantages in construction and interior applications, primarily due to its cost-effectiveness and ease of handling. As a structural fiberboard, it is priced comparably to or lower than oriented strand board (OSB) or plywood, making it an economical choice for sheathing, subflooring, and soundproofing without compromising performance.^[2] Its lightweight nature relative to traditional wood products facilitates straightforward transportation and installation, particularly for DIY projects where panels can be easily cut, shaped, and fastened using standard tools.^[2] Despite these benefits, Homasote has notable limitations that require careful consideration during use. It is susceptible to damage from prolonged exposure to moisture, potentially leading to expansion, contraction, or sagging if not properly protected or allowed to dry thoroughly before installation.^[38] Unlike rigid foam insulation, Homasote is significantly heavier—for instance, a standard 1/2-inch by 4-foot by 8-foot sheet weighs approximately 36 pounds based on its density of 25 to 29 pounds per cubic foot, compared to about 2.7 pounds for a similar-sized foam board— which can complicate handling in large-scale projects.^[39]^[40] Potential shrinkage may occur in varying humidity conditions if the material is not sealed, affecting dimensional stability over time.^[38] Installation practices must address these challenges to maximize Homasote's utility. Panels should be shielded from weather during storage and construction, with sealing recommended in humid environments to prevent moisture ingress and maintain integrity. While versatile for many interior uses, its weight and moisture sensitivity make it less ideal for high-load roofing applications without additional support, as noted in some construction guidelines. Availability can be limited and more expensive in certain regions, often requiring special orders from suppliers. In comparisons, Homasote provides superior sound dampening over foam but offers lower water resistance unless treated.^[38]^[24]

References

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Products | Homasote
### Composition of Homasote Products
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### Summary of Homasote Company History and Product Development
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Homasote 440 SoundBarrier will reduce transmission of airborne and impact sounds. Lightweight and easy to work with and cut.Where to Buy440 SoundBarrierAbout HomasoteApplicationsProducts
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Homasote was founded by Eugenius Harvey Outerbridge, but he is best remembered as the first chairman of the New York-New Jersey Port Authority, which was ...
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Some of my favorite things | Life of an Architect
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Homasote Company is the nation's oldest manufacturer of building products from recycled material, fiberboard products made from post-consumer recycled paper.
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As supplied and shipped, this product does not constitute a combustible dust explosive hazard. Section 3 – Composition/Information on Ingredients. Component.
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Each year approximately 65,000,000 pounds of waste paper – up to 250 tons each workday – are diverted from the waste stream to be recycled into sustainable, ...Missing: day | Show results with:day
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Learn about Homasote 440 SoundBarrier for superior sound control. Ideal for floors and walls, providing exceptional noise reduction.
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Physical Properties. Board Classifications. 440 Homasote 460 Homasote. Density lb/ft. 3 minimum. 25. 28 grams/cm. 3 minimum. 0.400. 0.450. Tensile Strength.
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In combination with conventional partition and floor systems, Homasote sound control products will reduce transmission of airborne and impact sounds.
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layer of Homasote 440 SoundBarrier® achieves an STC rating of 55. † empty cavity, no published tests with insulation. ** Test method ASTM E90. Sensible. Sound.
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Thermal Resistance: When tested in accordance with ASTM C 209 per. ASTM C 518: a. R-value: 1.2 for 1/2 inch (13 mm) thick board. b. R-value: 1.33 ...
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Homasote makes structural building boards designed for use in residential and commercial buildings that require a Class A (25 flame spread) rating.
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Homasote has scores of uses, from decorative wall coverings to fire-retardant roof insulation. If you already know how you want to use Homasote, use this list.Missing: sources | Show results with:sources
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Homasote is the gold standard in sound control. It can be installed any time of year, in virtually any weather, without interrupting the work of subcontractors.Missing: modular prefab
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All products are free of asbestos, formaldehyde, urea and phenolic additives. In the descriptions of specific boards in Sections 3.1 through 3.6, all ...
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Homasote building products are in compliance with major building codes, and are backed with a limited warranty, as stated below.
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For model railroad boards; To create lawn ornaments; To make a Christmas tree stand; For cut-out letters or other shapes. 440 SoundBarrier®. Use all-purpose ...
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Homasote's PAK-LINE provides packaging for items like auto parts, glass, and refrigerators. It's made of recycled fiberboard, is reusable, and shock-absorbing.
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Homasote's PAK-LINE solution uses adjustable side walls and bases with die-cut holes to secure auto glass racks, allowing one pack to transport six different ...
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PAK-LINE Solution: PAK-LINE Single Roll Suspension Pack. A unique interlocking container that can be assembled by one man in under 10 minutes. Packs have made ...
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Where is the product manufactured? Homasote products are manufactured at our sole manufacturing facility located in West Trenton,. New Jersey, 08628. 5.
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440 SoundBarrier is a lightweight sound deadening material, with a density of 25 to 29 pounds per cubic foot that is manufactured in thicknesses of 1/2”, ...
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FOAMULAR 1/2 in. x 4 ft. x 8 ft. R-3 Square Edge Rigid Foam Board ...
Out of stock Rating 4.7 (390) Excellent energy efficiency in the form of a high R-5 per inch. R means the ... Product Weight (lb.) 2.7 lb. Sheathing Size. 8 ft. x 0.5 in. x 48 in ...