What is asphalt board used for? The cover board is adhered using hot asphalt or a specially formulated adhesive that is applied over the top surface of the bottom layer of insulation. Second, the cover board serves to insulate the fastener eliminating energy loss and possible thermal bridging at fasteners and insulation joints.
What is asphalt used for?
What is Asphalt. Asphalt is a mixture of aggregates, binder and filler, used for constructing and maintaining roads, parking areas, railway tracks, ports, airport runways, bicycle lanes, sidewalks and also play- and sport areas. Aggregates used for asphalt mixtures could be crushed rock, sand, gravel or slags.
What is asphalt fiberboard made of?
Fiberboard structural sheathing is an engineered product made with ground up wood chips and lumber waste glued together with an asphalt binder or resin. Accordingly, what is Southern Pine asphalt impregnated board?
What are the components of asphalt?
The components of asphalt include four main classes of compounds: Naphthene aromatics (naphthalene), consisting of partially hydrogenated polycyclic aromatic compounds Polar aromatics, consisting of high molecular weight phenols and carboxylic acids produced by partial oxidation of the material
When was asphalt first used in Britain?
The first British patent for the use of asphalt was "Cassell's patent asphalte or bitumen" in 1834.
Are asphalt boards waterproof?
The material is noncombustible for high fire resistance and is water-resistant. Dens-Deck provides an excellent substrate for all types of conventional low-slope roofing membranes, particularly in fully adhered assemblies. The material is durable and provides superior impact and puncture resistance.02-Mar-2004
Can you cut asphalt impregnated board?
Cut really easy with a NEW skill saw blade.18-Jan-2022
What is the black fiberboard sheathing?
Fiberboard sheathing, also called black board, gray board, or buffalo board sheathing in some areas, is a fibrous material impregnated by (or in some cases coated with) a stabilizer and water repellant - asphalt on early versions of this material that we have found.
What is black insulation board made of?
It's a wood fiber board with a thin asphalt coating often called "buffalo board" or "beaverboard", the trade name of the long defunct Beaver Board Co. It was an inexpensive exterior wall sheathing.
Does asphalt impregnated board smell?
Fiberboard sheathing releases small amounts of asphalt odor, especially when heated by the sun. Fiberboard sheathing emits low levels of formaldehyde.25-Mar-2020
Is asphalt impregnated board toxic?
Burning of asphalt impregnated and/or coated wood can produce irritating and potentially toxic fumes and gases, black smoke, carbon dioxide, carbon monoxide, sulfur oxides and hydrogen sulfide.12-Jan-2009
Is fiberboard stronger than plywood?
Strength of Wood Board Types For all structural purposes, plywood is much stronger than fiberboard, reveals plywood/" rel="nofollow noopener">Bob Vila. Plywood is made from several individual layers glued together perpendicular to each other to provide strength.
Does fiberboard contain asbestos?
Fiberboard does not contain asbestos. Asbestos was banned in 1977 and cannot be used for any construction materials.
Are Buffalo Boards strong?
Decking Delivery's Plywood Buffalo Board is strong, durable and easy to work with. Perfect for indoor or outdoor use with a quality smooth finish.
Does all Celotex have asbestos?
Probably not. Celotex™ Cane fiber products [Cane products were not an asbestos-containing product, though some may have been manufactured at facilities where asbestos was present - Ed.]
Does insulation board have asbestos?
It is sometimes referred to as asbestos insulating board. LDB can contain up to 70 per cent asbestos fibres by volume.
What is asphalt used for?
In its fluid-like form, asphalt is used to waterproof walls and surfaces, as well as in shingles for residential roofing. A variety of industrial and recreational uses of asphalt make it an ideal choice for many areas of construction.
Why do architects use asphalt?
Asphalt is also an ideal solution for flood control and soil erosion.
What is the difference between mastic and asphalt?
It contains volatile chemicals and is restricted in many areas. Mastic – A dense and durable formula, mastic asphalt is a waterproofing medium.
What is mastic asphalt?
Mastic – A dense and durable formula, mastic asphalt is a waterproofing medium. It is a mixture of asphalt, stone filler and mineral powder that is heated and mixed at hot temperatures.
What is asphalt pavement?
Asphalt is nearly everywhere you look in American communities. Asphalt is a sticky, black, semi-solid form of petroleum used to bind aggregate together. A versatile material, asphalt creates a smooth, durable surface for driveways, walking paths, roads and parking lots.
How much asphalt is used on roads?
As one of the most recycled and reused types of pavement on the market, asphalt is used on 94 percent of paved roads in America. However, not all asphalt is created equal. Chemical composition and other properties determine what type of asphalt you’re driving on.
What is cold mix asphalt?
Cold mix can be used in cold or warm weather for pothole and crack repairs—and it even outlasts the surrounding pavement. Contractors use cut-back asphalt for tack coats, fog seals, slurry coats and as a stabilization element in mixes, while mastic asphalt is used in building and waterproofing for rooftops and underground storage.
How is asphalt made?
Asphalt is produced in an asphalt plant. This can be a fixed plant or even in a mobile mixing plant. It is possible to produce in an asphalt plant up to 800 tons per hour. The average production temperature of hot mix asphalt is between 150 and 180°C, but nowadays new techniques are available to produce asphalt at lower temperatures.
What is the first layer of asphalt called?
In general the asphalt layers are paved on a bound or unbound road base layer. Starting at the road surface, the first layer is called the surface course . The second layer is mostly called the binder course. The lower layers are the base courses.
What is aggregate used for?
Aggregates used for asphalt mixtures could be crushed rock, sand, gravel or slags. Nowadays, certain waste and by-products, such as construction and demolition debris, are being used as aggregates, which increases the sustainability of asphalt. In order to bind the aggregates into a cohesive mixture a binder is used.
What is surface course?
The surface course constitutes the top layer of the pavement and should be able to withstand high traffic- and environmentally-induced stresses without exhibiting unsatisfactory cracking and rutting. Its main mission is to provide an even profile for the comfort of the user, while providing enough texture to ensure minimum and safe skid resistance. Depending on local conditions, functional characteristics such as skid resistance, noise reduction and durability are often required for wearing courses. In some cases, rapid drainage of surface water is desired while in other cases, the wearing course should be impermeable in order to keep water out of the pavement structure. A wide range of surface layer products can be used depending on specific requirements. Surface layers types are: 1 Asphalt Concrete (AC) 2 Béton Bitumineux Mince (Thin Layer Asphalt Concrete – AC-TL) 3 Asphalt Concrete Very Thin Layers (AC-VTL) 4 Asphalt Concrete Ultra Thin Layer (AC-UTL) 5 Stone Mastic Asphalt (SMA) 6 Hot Rolled Asphalt (HRA) 7 Porous Asphalt (PA) 8 Double layered Porous Asphalt (2L PA) 9 Mastic Asphalt (MA) 10 Soft Asphalt (SA)
What is the second layer of pavement called?
The second layer is mostly called the binder course. The lower layers are the base courses. The surface course constitutes the top layer of the pavement and should be able to withstand high traffic- and environmentally-induced stresses without exhibiting unsatisfactory cracking and rutting.
What is the temperature of hot mix asphalt?
Hot Mix Asphalt (HMA) Hot asphalt mixes are generally produced at a temperature between 150 and 180 °C. Depending on the usage, a different asphalt mixture can be used. For more details of the different asphalt mixtures, go to “Asphalt products”.
Is bitumen a binder?
Most commonly, bitumen is used as a binder, although nowadays, a series of bio-based binders are also under development with the aim of minimising the environmental impact of the roads. An average asphalt pavement consists of the road structure above the formation level which includes unbound and bituminous-bound materials.
What is asphalt concrete?
The word "asphalt" is instead used to refer to asphalt concrete, a mixture of construction aggregate and asphalt itself (also called "tarmac" in common parlance). Bitumen mixed with clay was usually called "asphaltum", but the term is less commonly used today.
Where does the word "asphalt" come from?
The word "asphalt" is derived from the late Middle English, in turn from French asphalte, based on Late Latin asphalton, asphaltum, which is the latinisation of the Greek ἄσφαλτος ( ásphaltos, ásphalton ), a word meaning "asphalt/bitumen/ pitch ", which perhaps derives from ἀ-, "not, without", i.e. the alpha privative, and σφάλλειν ( sphallein ), "to cause to fall, baffle, (in passive) err, (in passive) be balked of". The first use of asphalt by the ancients was in the nature of a cement for securing or joining together various objects, and it thus seems likely that the name itself was expressive of this application. Specifically, Herodotus mentioned that bitumen was brought to Babylon to build its gigantic fortification wall. From the Greek, the word passed into late Latin, and thence into French ( asphalte) and English ("asphaltum" and "asphalt"). In French, the term asphalte is used for naturally occurring asphalt-soaked limestone deposits, and for specialised manufactured products with fewer voids or greater bitumen content than the "asphaltic concrete" used to pave roads.
Why is asphalt a hydrophobic matrix?
Asphalt was used starting in the 1960s as a hydrophobic matrix aiming to encapsulate radioactive waste such as medium-activity salts (mainly soluble sodium nitrate and sodium sulfate) produced by the reprocessing of spent nuclear fuels or radioactive sludges from sedimentation ponds. Bituminised radioactive waste containing highly radiotoxic alpha-emitting transuranic elements from nuclear reprocessing plants have been produced at industrial scale in France, Belgium and Japan, but this type of waste conditioning has been abandoned because operational safety issues (risks of fire, as occurred in a bituminisation plant at Tokai Works in Japan) and long-term stability problems related to their geological disposal in deep rock formations. One of the main problems is the swelling of asphalt exposed to radiation and to water. Asphalt swelling is first induced by radiation because of the presence of hydrogen gas bubbles generated by alpha and gamma radiolysis. A second mechanism is the matrix swelling when the encapsulated hygroscopic salts exposed to water or moisture start to rehydrate and to dissolve. The high concentration of salt in the pore solution inside the bituminised matrix is then responsible for osmotic effects inside the bituminised matrix. The water moves in the direction of the concentrated salts, the asphalt acting as a semi-permeable membrane. This also causes the matrix to swell. The swelling pressure due to osmotic effect under constant volume can be as high as 200 bar. If not properly managed, this high pressure can cause fractures in the near field of a disposal gallery of bituminised medium-level waste. When the bituminised matrix has been altered by swelling, encapsulated radionuclides are easily leached by the contact of ground water and released in the geosphere. The high ionic strength of the concentrated saline solution also favours the migration of radionuclides in clay host rocks. The presence of chemically reactive nitrate can also affect the redox conditions prevailing in the host rock by establishing oxidizing conditions, preventing the reduction of redox-sensitive radionuclides. Under their higher valences, radionuclides of elements such as selenium, technetium, uranium, neptunium and plutonium have a higher solubility and are also often present in water as non-retarded anions. This makes the disposal of medium-level bituminised waste very challenging.
What is asphalt viscosity?
Asphalt, also known as bitumen ( UK: / ˈbɪtjʊmɪn /, US: / bɪˈtjuːmən, baɪ -/ ), is a sticky, black, highly viscous liquid or semi-solid form of petroleum.
How much asphalt is used in the US?
There are about 4,000 asphalt concrete mixing plants in the US, and a similar number in Europe.
How long can you be exposed to asphalt?
The National Institute for Occupational Safety and Health (NIOSH) has set a recommended exposure limit of 5 mg/m 3 over a 15-minute period.
Where is the largest asphalt deposit in the world?
The largest natural deposit of asphalt in the world, estimated to contain 10 million tons, is the Pitch Lake located in La Brea in southwest Trinidad ( Antilles island located on the northeastern coast of Venezuela ), within the Siparia Regional Corporation.
Product Overview
This fiberboard wall sheathing offers high insulation value, a sturdy panel and sound-deadening and can be used in many above ground applications. This cost-efficient product features interknit wood fibers that protect against on-the-job abuse and help supplement required wall bracing in traditional stud wall construction.
Info & Guides
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What is fiberboard insulation?
Fiberboard insulation is an organic insulating board that is composed of wood or bayasse (cane) fibers. A finished board can be left plain or it can be impregnated with asphalt, which makes it more moisture-resistant. The fiberboard can also be coated with asphalt, which not only provides additional resistance to moisture, but it also improves its bonding characteristics. If moisture enters into the insulation it changes its dimensions, which is a serious disadvantage. To avoid the extrusion of moisture into the insulation, it is normally required that a vapor barrier be installed between the interior of the building and the insulation. This is especially true of buildings with high moisture conditions.
Why cover board over insulation?
First, it reduces the shank length of the fastener by as much as one-half of the total insulation thickness. The fastener is only required to penetrate through the bottom layer of the insulation.
What is the fastener on a cover board?
The fastener is only required to penetrate through the bottom layer of the insulation . The cover board is adhered using hot asphalt or a specially formulated adhesive that is applied over the top surface of the bottom layer of insulation.
What type of insulation is used for low slope roofs?
There are four common types of insulation that can be used as cover boards in conventional low-slope membrane roof systems: fiberboard, perlite, Dens-Deck and isocyanurate composite boards.
How should insulation board joints be aligned?
The insulation board joints should be butted and aligned in both directions with the end joints staggered by maximum dimensions possible in relation to joints on the bottom layer of insulation. Make sure that the board ends and sides touch all along their length. Minor gaps in boards should be filled with roof adhesive.
What should be the joints of insulation boards in the top layer?
The joints of the insulation boards in the top layer should be vertically staggered and offset from the joints of the insulation boards in the bottom layer. The edges of the insulation boards should be square, flush and have moderate contact with the edges of the adjacent insulation boards. End joints between boards should be staggered.
Can you move cant strips without board breakage?
If insulation boards, cant strips or tapered edge strips can be lifted or moved by hand without board breakage, they are not attached well enough. The roof designer and contractor can be of benefit to their clients if they know when to apply cover boards, the types of materials suitable to the project, and proper installation procedures.
Uses of Fiberboard
Fiberboard is seen across various industries. When it comes to uses, here are the most common uses of fiberboard:
Disadvantages of Fiberboard
Just like other products, fiberboard also comes with its disadvantages, including:
Conclusion
Even though fiberboard is considered an eco-friendly material, it is very important to note that it also contains specific chemicals including urea-formaldehyde, which is a carcinogen ingredient that could be hazardous if not appropriately treated. As such, it is important to treat your product in a well-ventilated location.
What is OSB sheathing?
Oriented strand board (OSB) is a panel sheathing made from hundreds of rectangular thin wood strands (1-inch by 4-inch flakes), arranged in cross-oriented layers. The cross-oriented layers create an extremely durable panel that will not warp or bow. The strands are hot pressed onto sheets with a resin and wax adhesives. OSB come in sizes up to 8 feet wide and 16 foot long and is used in commercial and residential construction
Why is fiberboard sheathing so heavy?
Fiberboard sheathing is heavy because it is so dense, which can make it difficult to handle. Fiberboard sheathing releases small amounts of asphalt odor, especially when heated by the sun. Fiberboard sheathing emits low levels of formaldehyde.
What is structural sheathing?
Two common types of structural wall sheathing are oriented strand board (OSB) and fiberboard sheathing. They attach to the exterior wall framing and brace the walls against positive and negative forces. Both are wood products, which makes them earth friendly. However, there are several differences between OSB and fiberboard structural sheathing.
Is fiberboard a stable material?
Fiberboard is dimensionally stable, so resistant to expansion and contraction. Fiberboard sheathing permits water vapor generated inside the structure to pass through the wall cavity, thus reducing the potential of trapped water within the wall.
Is OSB fiberboard or structural sheathing?
Structural Sheathing OSB Cons: OSB is susceptible to dimensional instability and may expand and contract with changes in temperature. OSB requires significantly more processing and energy to manufacture than fiberboard, so it has a bigger environmental impact and contributor to global warming than fiberboard.
Is OSB stronger than fiberboard?
Structural Sheathing OSB Pros: OSBs are durable panels that are solid and dense throughout the product, with no soft spots. OSB is stronger than fiberboard sheathing. OSB holds fasteners well and creates a strong bond between studs.
Does fiberboard hold screws?
Fiberboard sheathing does not hold screws as well as OSB. Fiberboard has slighter greater insulation value than OSB. Both are susceptible to mold, wood rot, and swelling due to moisture intrusion; however, fiberboard is more permeable than OSB.
What is fiberboard sheathing used for?
Shown at the start of this article is brown fiberboard sheathing used to enclose a soffit overhang. Fiberboard products have been widely used on building exteriors as a non-structural wall sheathing, even on some roofs as roof sheathing, and on building interiors as a ceiling or wall covering.
How long has fiberboard been used?
In addition to plywood, OSB, and gypsum board, impregnated fiberboard produced in 4 ft. widths and varying lengths up to 12-feet has been used as exterior building insulating sheathing in North America since at least 1907.
What is fiberboard insulation made of?
Fiberboard insulating sheathing was and continues to be made of plant cellulose such as wood fibers, combined with a binder, a water-resistive coating or component (such as paraffin and/or asphalt), and other treatments that we detail below.
Is asbestos a fiberboard?
Asbestos is not an "official" ingredient in fiberboard insulating sheathing. However there are possibilities of cross-contamination of such products by asbestos as asbestos was processed at some of the same fabrication facilities that also made wood or vegetable fiber board products.
Overview
History
The use of natural bitumen for waterproofing, and as an adhesive dates at least to the fifth millennium BC, with a crop storage basket discovered in Mehrgarh, of the Indus Valley Civilization, lined with it. By the 3rd millennium BC refined rock asphalt was in use in the region, and was used to waterproof the Great Bath in Mohenjo-daro.
In the ancient Middle East, the Sumerians used natural bitumen deposits for mortar between bricks and stones, to cement parts of carvings, such as eyes, into place, for ship caulking, and for waterproofing. The Greek historian H…
Terminology
The word "asphalt" is derived from the late Middle English, in turn from French asphalte, based on Late Latin asphalton, asphaltum, which is the latinisation of the Greek ἄσφαλτος (ásphaltos, ásphalton), a word meaning "asphalt/bitumen/pitch", which perhaps derives from ἀ-, "not, without", i.e. the alpha privative, and σφάλλειν (sphallein), "to cause to fall, baffle, (in passive) err, (in passive) be balked of". The first use of asphalt by the ancients was in the nature of a cement for securing or joining various objects, and it thus seems likely that the n…
Composition
The components of asphalt include four main classes of compounds:
• Naphthene aromatics (naphthalene), consisting of partially hydrogenated polycyclic aromatic compounds
• Polar aromatics, consisting of high molecular weight phenols and carboxylic acids produced by partial oxidation of the material
Occurrence
The majority of asphalt used commercially is obtained from petroleum. Nonetheless, large amounts of asphalt occur in concentrated form in nature. Naturally occurring deposits of bitumen are formed from the remains of ancient, microscopic algae (diatoms) and other once-living things. These natural deposits of bitumen have been formed during the Carboniferous period, when giant swamp forests dominated many parts of the Earth. They were deposited in the mud on the bottom of the ocean or lake where the organisms lived. Under the heat (above 50 °C…
Modern use
The vast majority of refined asphalt is used in construction: primarily as a constituent of products used in paving and roofing applications. According to the requirements of the end use, asphalt is produced to specification. This is achieved either by refining or blending. It is estimated that the current world use of asphalt is approximately 102 million tonnes per year. Approximately 85% of all the asphalt produced is used as the binder in asphalt concrete for roa…
Production
About 40,000,000 tons were produced in 1984. It is obtained as the "heavy" (i.e., difficult to distill) fraction. Material with a boiling point greater than around 500 °C is considered asphalt. Vacuum distillation separates it from the other components in crude oil (such as naphtha, gasoline and diesel). The resulting material is typically further treated to extract small but valuable amounts of lubricants and to adjust the properties of the material to suit applications…
Recycling
Asphalt is a commonly recycled material in the construction industry. The two most common recycled materials that contain asphalt are reclaimed asphalt pavement (RAP) and reclaimed asphalt shingles (RAS). RAP is recycled at a greater rate than any other material in the United States, and typically contains approximately 5 – 6% asphalt binder. Asphalt shingles typically contain 20 – 40% asphalt binder.
Asphalt naturally becomes stiffer over time due to oxidation, evaporation, exudation, and physical hardening. Fo…