84-505: The Tall Pines Inn is a historic log cabin resort located at the junction of Pivot Rock Road and United States Route 62 in Eureka Springs , Arkansas . Established in 1947, it features six rustic cabins built from surrounding forests and modernized to meet the needs of today's traveler. Besides these cabins, which are of log construction, the inn has three suites which are part of the original log residence (formerly occupied by
168-424: A glass with no true melting point, can be used as a glass fiber for fiberglass but has the drawback that it must be worked at very high temperatures. In order to lower the necessary work temperature, other materials are introduced as "fluxing agents" (i.e., components to lower the melting point). Ordinary A-glass ("A" for "alkali-lime") or soda lime glass, crushed and ready to be remelted, as so-called cullet glass,
252-556: A 5 mg/m total limit. As of 2001, the Hazardous Substances Ordinance in Germany dictates a maximum occupational exposure limit of 86 mg/m . In certain concentrations, a potentially explosive mixture may occur. Further manufacture of GRP components (grinding, cutting, sawing) creates fine dust and chips containing glass filaments, as well as tacky dust, in quantities high enough to affect health and
336-621: A November, 2011 modification to its Proposition 65 listing to include only "Glass wool fibers (inhalable and biopersistent)." Therefore a cancer warning label for biosoluble fiber glass home and building insulation is no longer required under federal or California law. As of 2012, the North American Insulation Manufacturers Association stated that fiberglass is safe to manufacture, install and use when recommended work practices are followed to reduce temporary mechanical irritation. As of 2012,
420-720: A basic form of log construction was used all over North Europe and Asia and later imported to America. Log construction was especially suited to Scandinavia, where straight, tall tree trunks ( pine and spruce ) are readily available. With suitable tools, a log cabin can be erected from scratch in days by a family. As no chemical reaction is involved, such as hardening of mortar, a log cabin can be erected in any weather or season. Many older towns in Northern Scandinavia have been built exclusively out of log houses, which have been decorated by board paneling and wood cuttings. Today, construction of modern log cabins as leisure homes
504-439: A binder. It is typically processed using the hand lay-up technique, where sheets of material are placed on a mold and brushed with resin. Because the binder dissolves in resin, the material easily conforms to different shapes when wetted out. After the resin cures, the hardened product can be taken from the mold and finished. Using chopped strand mat gives the fiberglass isotropic in-plane material properties. A coating or primer
588-607: A broad range of mortar or other infill materials used between the logs in the construction of log cabins and other log-walled structures. Traditionally, dried mosses, such as Pleurozium schreberi or Hylocomium splendens , were used in the Nordic countries as an insulator between logs. In the United States, Chinks were small stones or wood or corn cobs stuffed between the logs. In the United States, settlers may have first constructed log cabins by 1640. Historians believe that
672-417: A chemical solution. The individual filaments are now bundled in large numbers to provide a roving . The diameter of the filaments, and the number of filaments in the roving, determine its weight , typically expressed in one of two measurement systems: These rovings are then either used directly in a composite application such as pultrusion , filament winding (pipe), gun roving (where an automated gun chops
756-401: A combined stream from a chopper gun. Workers roll out the spray-up to compact the laminate. Wood, foam or other core material may then be added, and a secondary spray-up layer imbeds the core between the laminates. The part is then cured, cooled, and removed from the reusable mold. Pultrusion is a manufacturing method used to make strong, lightweight composite materials. In pultrusion, material
840-430: A liner to prevent gas leakage or as a barrier to protect the composite from the fluid to be stored. Filament winding is well suited to automation, and there are many applications, such as pipe and small pressure vessels that are wound and cured without any human intervention. The controlled variables for winding are fiber type, resin content, wind angle, tow or bandwidth and thickness of the fiber bundle. The angle at which
924-415: A log cabin tends to compress slightly as it settles, over a few months or years. Nails would soon be out of alignment and torn out. Log cabins were largely built from logs laid horizontally and interlocked on the ends with notches. Some log cabins were built without notches and simply nailed together, but this was not as structurally sound. The most important aspect of cabin building is the site upon which
SECTION 10
#17328017244171008-472: A love of forests, and they ended up living alongside and even culturally assimilating with them (they are the earlier and lesser-known Findian tribe, being overshadowed by the Ojibwe Findians of Minnesota, Michigan and Ontario, Canada). In those forests, the first log cabins of America were built, using traditional Finnish methods. Even though New Sweden existed only briefly before it was absorbed by
1092-674: A popular type of barn found throughout the American Southern and Southeastern regions . Crib barns were especially ubiquitous in the Appalachian and Ozark Mountain states of North Carolina , Virginia , Kentucky , Tennessee , and Arkansas . In Europe , modern log cabins are often built in gardens and used as summerhouses, home offices, or as an additional room in the garden. Summer houses and cottages are often built from logs in Northern Europe . Chinking refers to
1176-936: A post-exposure recovery period." Historic reviews of the epidemiology studies had been conducted by Harvard's Medical and Public Health Schools in 1995, the National Academy of Sciences in 2000, the Agency for Toxic Substances and Disease Registry ("ATSDR") in 2004, and the National Toxicology Program in 2011. which reached the same conclusion as IARC that there is no evidence of increased risk from occupational exposure to glass wool fibers. Genetic and toxic effects are exerted through production of reactive oxygen species , which can damage DNA, and cause chromosomal aberrations , nuclear abnormalities, mutations, gene amplification in proto-oncogenes , and cell transformation in mammalian cells. There
1260-459: A sheet called a chopped strand mat, or woven into glass cloth . The plastic matrix may be a thermoset polymer matrix —most often based on thermosetting polymers such as epoxy , polyester resin , or vinyl ester resin —or a thermoplastic . Cheaper and more flexible than carbon fiber , it is stronger than many metals by weight, non- magnetic , non- conductive , transparent to electromagnetic radiation , can be molded into complex shapes, and
1344-433: A small gabled-roof cabin of round logs with an opening in the roof to vent smoke, to more sophisticated squared logs with interlocking double-notch joints, the timber extending beyond the corners. Log saunas or bathhouses of this type are still found in rural Finland. By stacking tree trunks one on top of another and overlapping the logs at the corners, people made the "log cabin". They developed interlocking corners by notching
1428-415: A thermoplastic inner tank which acts as a preform during construction. Much more reliable tanks are made using woven mat or filament wound fiber, with the fiber orientation at right angles to the hoop stress imposed in the sidewall by the contents. Such tanks tend to be used for chemical storage because the plastic liner (often polypropylene ) is resistant to a wide range of corrosive chemicals. Fiberglass
1512-842: A variety of notches. One method common in the Ohio River Valley in Southwestern Ohio and Southeastern Indiana is the block house end method, which is exemplified in the David Brown House in Rising Sun, Indiana . Some older buildings in the Midwestern United States and the Canadian Prairies are log structures covered with clapboards or other materials. 19th-century cabins used as dwellings were occasionally plastered on
1596-427: Is a fabrication technique mainly used for manufacturing open (cylinders) or closed-end structures (pressure vessels or tanks). The process involves winding filaments under tension over a male mandrel. The mandrel rotates while a wind eye on a carriage moves horizontally, laying down fibers in the desired pattern. The most common filaments are carbon or glass fiber and are coated with synthetic resin as they are wound. Once
1680-463: Is a fully developed industry in Finland and Sweden. Modern log cabins often feature fiberglass insulation and are sold as prefabricated kits machined in a factory, rather than hand-built in the field like ancient log cabins. Log cabins are mostly constructed without the use of nails and thus derive their stability from simple stacking, with only a few dowel joints for reinforcement. This is because
1764-551: Is also indirect, inflammation-driven genotoxicity through reactive oxygen species by inflammatory cells . The longer and thinner as well as the more durable (biopersistent) fibers were, the more potent they were in damage. In the US, fine mineral fiber emissions have been regulated by the EPA , but respirable fibers (“particulates not otherwise regulated”) are regulated by Occupational Safety and Health Administration (OSHA); OSHA has set
SECTION 20
#17328017244171848-432: Is also used for septic tanks . Glass-reinforced plastics are also used to produce house building components such as roofing laminate, door surrounds, over-door canopies, window canopies and dormers, chimneys, coping systems, and heads with keystones and sills. The material's reduced weight and easier handling, compared to wood or metal, allows faster installation. Mass-produced fiberglass brick-effect panels can be used in
1932-401: Is applied to the chosen mold to allow the finished product to be cleanly removed from the mold. Resin—typically a 2-part thermoset polyester, vinyl, or epoxy—is mixed with its hardener and applied to the surface. Sheets of fiberglass matting are laid into the mold, then more resin mixture is added using a brush or roller. The material must conform to the mold, and air must not be trapped between
2016-479: Is applied to the roving to help protect the glass filaments for processing and manipulation and to ensure proper bonding to the resin matrix, thus allowing for the transfer of shear loads from the glass fibers to the thermoset plastic. Without this bonding, the fibers can 'slip' in the matrix causing localized failure. An individual structural glass fiber is both stiff and strong in tension and compression —that is, along its axis. Although it might be assumed that
2100-483: Is called pultrusion . The manufacturing process for glass fibers suitable for reinforcement uses large furnaces to gradually melt the silica sand, limestone , kaolin clay , fluorspar , colemanite , dolomite and other minerals until a liquid forms. It is then extruded through bushings ( spinneret ), which are bundles of very small orifices (typically 5–25 micrometres in diameter for E-Glass, 9 micrometres for S-Glass). These filaments are then sized (coated) with
2184-478: Is chemically inert under many circumstances. Applications include aircraft, boats, automobiles, bath tubs and enclosures, swimming pools , hot tubs , septic tanks , water tanks , roofing, pipes, cladding, orthopedic casts , surfboards , and external door skins. Other common names for fiberglass are glass-reinforced plastic ( GRP ), glass-fiber reinforced plastic ( GFRP ) or GFK (from German : Glasfaserverstärkter Kunststoff ). Because glass fiber itself
2268-529: Is credited with producing the first composite boat in 1937 but did not proceed further at the time because of the brittle nature of the plastic used. In 1939 Russia was reported to have constructed a passenger boat of plastic materials, and the United States a fuselage and wings of an aircraft. The first car to have a fiberglass body was a 1946 prototype of the Stout Scarab , but the model did not enter production. Unlike glass fibers used for insulation, for
2352-401: Is essentially an entire two-dimensional plane; with woven fabrics or unidirectional layers, directionality of stiffness and strength can be more precisely controlled within the plane. A fiberglass component is typically of a thin "shell" construction, sometimes filled on the inside with structural foam, as in the case of surfboards. The component may be of nearly arbitrary shape, limited only by
2436-513: Is pulled through forming machinery using either a hand-over-hand method or a continuous-roller method (as opposed to extrusion , where the material is pushed through dies). In fiberglass pultrusion, fibers (the glass material) are pulled from spools through a device that coats them with a resin. They are then typically heat-treated and cut to length. Fiberglass produced this way can be made in a variety of shapes and cross-sections, such as W or S cross-sections. People can be exposed to fiberglass in
2520-639: Is required, such as equipment cabinets and steel support structures, due to the ease with which it can be molded and painted to blend with existing structures and surfaces. Other uses include sheet-form electrical insulators and structural components commonly found in power-industry products. Because of fiberglass's lightweight and durability, it is often used in protective equipment such as helmets. Many sports use fiberglass protective gear, such as goaltenders' and catchers' masks. Storage tanks can be made of fiberglass with capacities up to about 300 tonnes . Smaller tanks can be made with chopped strand mat cast over
2604-510: Is sometimes referred to as "fiberglass", the composite is also called fiberglass-reinforced plastic ( FRP ). This article uses "fiberglass" to refer to the complete fiber-reinforced composite material, rather than only to the glass fiber within it. Glass fibers have been produced for centuries, but the earliest patent was awarded to the Prussian inventor Hermann Hammesfahr (1845–1914) in the U.S. in 1880. Mass production of glass strands
Tall Pines Motor Inn - Misplaced Pages Continue
2688-402: Is that the resins used are subject to contraction during the curing process. For polyester this contraction is often 5–6%; for epoxy, about 2%. Because the fibers do not contract, this differential can create changes in the shape of the part during curing. Distortions can appear hours, days, or weeks after the resin has set. While this distortion can be minimized by symmetric use of the fibers in
2772-464: Is used when tensile strength (high modulus) is important and is thus an important building and aircraft epoxy composite (it is called R-glass, "R" for "reinforcement" in Europe). C-glass ("C" for "chemical resistance") and T-glass ("T" is for "thermal insulator"—a North American variant of C-glass) are resistant to chemical attack; both are often found in insulation-grades of blown fiberglass. Fiberglass
2856-433: Is versatile because it is lightweight, strong, weather-resistant, and can have a variety of surface textures. During World War II, fiberglass was developed as a replacement for the molded plywood used in aircraft radomes (fiberglass being transparent to microwaves ). Its first main civilian application was for the building of boats and sports car bodies, where it gained acceptance in the 1950s. Its use has broadened to
2940-468: The 1952 presidential election in a landslide to Dwight D. Eisenhower . A popular children's toy in the United States is Lincoln Logs , which are various notched dowel rods that can be fitted together to build scale miniature-sized structures. Fiberglass Fiberglass ( American English ) or fibreglass ( Commonwealth English ) is a common type of fiber-reinforced plastic using glass fiber . The fibers may be randomly arranged, flattened into
3024-573: The International Agency for Research on Cancer (IARC) as "not classifiable as to carcinogenicity to humans" ( IARC group 3 ). "Epidemiologic studies published during the 15 years since the previous IARC monographs review of these fibers in 1988 provide no evidence of increased risks of lung cancer or mesothelioma (cancer of the lining of the body cavities) from occupational exposures during the manufacture of these materials, and inadequate evidence overall of any cancer risk." In June 2011,
3108-533: The 18th century still stand, but they were often not intended as permanent dwellings. Possibly the oldest surviving log house in the United States is the C. A. Nothnagle Log House ( c. 1640 ) in New Jersey. Settlers often built log cabins as temporary homes to live in while constructing larger, permanent houses; then they either demolished the log structures or used them as outbuildings, such as barns or chicken coops . Log cabins were sometimes hewn on
3192-637: The Dutch colony of New Netherland , which was eventually taken over by the English, these quick and easy construction techniques of the Finns not only remained, but spread. Germans and Ukrainians also used this technique. The contemporaneous British settlers had no tradition of building with logs, but they quickly adopted the method. The first English settlers did not widely use log cabins, building in forms more traditional to them. Few log cabins dating from
3276-555: The European Union and Germany have classified synthetic glass fibers as possibly or probably carcinogenic, but fibers can be exempt from this classification if they pass specific tests. A 2012 health hazard review for the European Commission stated that inhalation of fiberglass at concentrations of 3, 16 and 30 mg/m3 "did not induce fibrosis nor tumours except transient lung inflammation that disappeared after
3360-573: The US National Toxicology Program (NTP) removed from its Report on Carcinogens all biosoluble glass wool used in home and building insulation and for non-insulation products. However, NTP still considers fibrous glass dust to be "reasonably anticipated [as] a human carcinogen (Certain Glass Wool Fibers (Inhalable))". Similarly, California's Office of Environmental Health Hazard Assessment (OEHHA) published
3444-458: The air near manufacturing facilities or when they are near building fires or implosions . The American Lung Association advises that fiberglass insulation should never be left exposed in an occupied area. Since work practices are not always followed, and fiberglass is often left exposed in basements that later become occupied, people can get exposed. No readily usable biological or clinical indices of exposure exist. Fiberglass will irritate
Tall Pines Motor Inn - Misplaced Pages Continue
3528-599: The automotive and sport equipment sectors. In the production of some products, such as aircraft, carbon fiber is now used instead of fiberglass, which is stronger by volume and weight. Advanced manufacturing techniques such as pre-pregs and fiber rovings extend fiberglass's applications and the tensile strength possible with fiber-reinforced plastics. Fiberglass is also used in the telecommunications industry for shrouding antennas , due to its RF permeability and low signal attenuation properties. It may also be used to conceal other equipment where no signal permeability
3612-535: The cabin was built. Site selection was aimed at providing the cabin inhabitants with both sunlight and drainage to make them better able to cope with the rigors of frontier life. Proper site selection placed the home in a location best suited to manage the farm or ranch. When the first pioneers built cabins, they were able to "cherry pick" the best logs for cabins. These were old-growth trees with few limbs (knots) and straight with little taper. Such logs did not need to be hewn to fit well together. Careful notching minimized
3696-405: The cabin. The decision about roof type often was based on the material for roofing like bark. Milled lumber was usually the most popular choice for rafter roofs in areas where it was available. These roofs typify many log cabins built in the 20th century, having full-cut 2×4 rafters covered with pine and cedar shingles. The purlin roofs found in rural settings and locations, where milled lumber
3780-400: The characteristic triangular gable end. The steepness of the roof was determined by the reduction in size of each gable-wall log as well as the total number of gable-wall logs. Flatter roofed cabins might have had only 2 or 3 gable-wall logs while steeply pitched roofs might have had as many gable-wall logs as a full story. Issues related to eave overhang and a porch also influenced the layout of
3864-550: The complexity and tolerances of the mold used for manufacturing the shell. The mechanical functionality of materials is heavily reliant on the combined performances of both the resin (AKA matrix) and fibers. For example, in severe temperature conditions (over 180 °C), the resin component of the composite may lose its functionality, partially due to bond deterioration of resin and fiber. However, GFRPs can still show significant residual strength after experiencing high temperatures (200 °C). One notable feature of fiberglass
3948-412: The construction of composite housing, and can include insulation to reduce heat loss. In rod pumping applications, fiberglass rods are often used for their high tensile strength to weight ratio. Fiberglass rods provide an advantage over steel rods because they stretch more elastically (lower Young's modulus ) than steel for a given weight, meaning more oil can be lifted from the hydrocarbon reservoir to
4032-596: The decades, increasingly complex joints were developed to ensure more weather tight joints between the logs, but the profiles were still largely based on the round log. A medieval log cabin was considered movable property, evidenced by the relocation of Espåby in 1557, where the buildings were disassembled, transported to a new location, and reassembled. It was also common to replace individual logs damaged by dry rot as necessary. The Wood Museum in Trondheim , Norway, displays fourteen different traditional profiles, but
4116-642: The deep forests of inland Sweden and Norway, during Sweden's 600+ year colonial rule over Finland, who since 1640 were being captured and displaced to the colony. After arriving, they would escape the Fort Christina center where the Swedes lived, to go and live in the forest as they did back home. They encountered the Lenape Indian tribe, with whom they found many cultural similarities, including slash and burn agriculture, sweat lodges and saunas, and
4200-973: The design, a certain amount of internal stress is created; and if it becomes too great, cracks form. The most common types of glass fiber used in fiberglass is E-glass , which is alumino-borosilicate glass with less than 1% w/w alkali oxides, mainly used for glass-reinforced plastics. Other types of glass used are A-glass ( A lkali-lime glass with little or no boron oxide), E-CR-glass ( E lectrical/ C hemical R esistance; alumino-lime silicate with less than 1% w/w alkali oxides, with high acid resistance), C-glass (alkali-lime glass with high boron oxide content, used for glass staple fibers and insulation), D-glass (borosilicate glass, named for its low D ielectric constant), R-glass (alumino silicate glass without MgO and CaO with high mechanical requirements as R einforcement), and S-glass (alumino silicate glass without CaO but with high MgO content with high tensile strength). Pure silica (silicon dioxide), when cooled as fused quartz into
4284-433: The early 1940s, and many sailing vessels made after 1950 were built using the fiberglass lay-up process . As of 2022, boats continue to be made with fiberglass, though more advanced techniques such as vacuum bag moulding are used in the construction process. Though most bullet-resistant armours are made using different textiles, fiberglass composites have been shown to be effective as ballistic armor. Filament winding
SECTION 50
#17328017244174368-843: The end of the 19th century and beginning of the 20th century. Log cabin building never died out or fell out of favor. It was surpassed by the needs of a growing urban United States. During the 1930s and the Great Depression , the Roosevelt administration directed the Civilian Conservation Corps to build log lodges throughout the west for use by the Forest Service and the National Park Service . Timberline Lodge on Mount Hood in Oregon
4452-669: The exterior and sometimes interior of the house. These cabins are mass manufactured, traditionally in Scandinavian countries and increasingly in Eastern Europe . Squared milled logs are precut for easy assembly. Log homes are popular in rural areas, and even in some suburban locations. In many resort communities in the Western United States , homes of log and stone measuring over 3,000 sq ft (280 m ) are not uncommon. These "kit" log homes are one of
4536-562: The eyes, skin, and the respiratory system. Hence, symptoms can include itchy eyes, skin, nose, sore throat, hoarseness, dyspnea (breathing difficulty) and cough. Peak alveolar deposition was observed in rodents and humans for fibers with diameters of 1 to 2 μm. In animal experiments, adverse lung effects such as lung inflammation and lung fibrosis have occurred, and increased incidences of mesothelioma , pleural sarcoma , and lung carcinoma had been found with intrapleural or intratracheal instillations in rats. As of 2001, in humans only
4620-563: The fiber has an effect on the properties of the final product. A high angle "hoop" will provide circumferential or "burst" strength, while lower angle patterns (polar or helical) will provide greater longitudinal tensile strength. Products currently being produced using this technique range from pipes, golf clubs, Reverse Osmosis Membrane Housings, oars, bicycle forks, bicycle rims, power and transmission poles, pressure vessels to missile casings, aircraft fuselages and lamp posts and yacht masts. A release agent, usually in either wax or liquid form,
4704-434: The fiber is weak in compression, it is actually only the long aspect ratio of the fiber which makes it seem so; i.e., because a typical fiber is long and narrow, it buckles easily. On the other hand, the glass fiber is weak in shear—that is, across its axis. Therefore, if a collection of fibers can be arranged permanently in a preferred direction within a material, and if they can be prevented from buckling in compression,
4788-415: The fiberglass and the mold. Additional resin is applied and possibly additional sheets of fiberglass. Hand pressure, vacuum or rollers are used to be sure the resin saturates and fully wets all layers, and that any air pockets are removed. The work must be done quickly before the resin starts to cure unless high-temperature resins are used which will not cure until the part is warmed in an oven. In some cases,
4872-420: The final structure to be strong, the fiber's surfaces must be almost entirely free of defects, as this permits the fibers to reach gigapascal tensile strengths . If a bulk piece of glass were defect-free, it would be as strong as glass fibers; however, it is generally impractical to produce and maintain bulk material in a defect-free state outside of laboratory conditions. The process of manufacturing fiberglass
4956-625: The first log cabins built in North America were in the Swedish colony of New Sweden along the Delaware River and Brandywine River valleys. Most of the settlers were actually Forest Finns , a heavily oppressed Finnish ethnic group originally from Savonia and Tavastia , who starting from the 1500s were displaced or persuaded to go inhabit and practice slash and burn agriculture (which they were famous for in eastern Finland) in
5040-458: The first log structures were probably being built in Northern Europe by the Bronze Age around 3500 BC. C. A. Weslager describes Europeans as having: The Finns were accomplished in building several forms of log housing, having different methods of corner timbering, and they utilized both round and hewn logs. Their log building had undergone an evolutionary process from the crude "pirtti"...
5124-459: The gas content of the material was replaced by plastic. This reduced the insulation properties to values typical of the plastic, but now for the first time, the composite showed great strength and promise as a structural and building material. Many glass fiber composites continued to be called "fiberglass" (as a generic name) and the name was also used for the low-density glass wool product containing gas instead of plastic. Ray Greene of Owens Corning
SECTION 60
#17328017244175208-473: The glass into short lengths and drops it into a jet of resin, projected onto the surface of a mold), or in an intermediary step, to manufacture fabrics such as chopped strand mat (CSM) (made of randomly oriented small cut lengths of fiber all bonded together), woven fabrics, knit fabrics or unidirectional fabrics. Chopped strand mat (CSM) is a form of reinforcement used in fiberglass. It consists of glass fibers laid randomly across each other and held together by
5292-731: The innkeeper), twelve other cabins/suites with wood siding, and a swimming pool. The Innkeeper's house and the six original log cabins were listed on the National Register of Historic Places in 1999, as an excellent local example of Rustic architecture. Log cabin A log cabin is a small log house , especially a minimally finished or less architecturally sophisticated structure. Log cabins have an ancient history in Europe, and in America are often associated with first-generation home building by settlers. Construction with logs
5376-598: The interior. The O'Farrell Cabin ( c. 1865 ) in Boise , Idaho , had backed wallpaper used over newspaper. The C.C.A. Christenson Cabin in Ephraim , Utah ( c. 1880 ) was plastered over willow lath. Log cabins reached their peak of complexity and elaboration with the Adirondack-style cabins of the mid-19th century. This style was the inspiration for many United States Park Service lodges built at
5460-490: The largest consumers of logs in the Western United States. In the United States, log homes have embodied a traditional approach to home building, one that has resonated throughout American history . Log homes represent a technology that allows a home to be built with a high degree of sustainability . They are frequently considered to be on the leading edge of the green building movement. Crib barns were
5544-441: The legal limit ( permissible exposure limit ) for fiberglass exposure in the workplace as 15 mg/m total and 5 mg/m in respiratory exposure over an 8-hour workday. The National Institute for Occupational Safety and Health (NIOSH) has set a recommended exposure limit (REL) of 3 fibers/cm (less than 3.5 micrometers in diameter and greater than 10 micrometers in length) as a time-weighted average over an 8-hour workday, and
5628-449: The logs at the ends, resulting in strong structures that were easier to make weather-tight by inserting moss or other soft material into the joints. As the original coniferous forest extended over the coldest parts of the world, there was a prime need to keep these cabins warm. The insulating properties of the solid wood were a great advantage over a timber frame construction covered with animal skins, felt , boards or shingles . Over
5712-413: The mandrel is completely covered to the desired thickness, the resin is cured; often the mandrel is placed in an oven to achieve this, though sometimes radiant heaters are used with the mandrel still turning in the machine. Once the resin has cured, the mandrel is removed, leaving the hollow final product. For some products such as gas bottles, the 'mandrel' is a permanent part of the finished product forming
5796-449: The material will be preferentially strong in that direction. Furthermore, by laying multiple layers of fiber on top of one another, with each layer oriented in various preferred directions, the material's overall stiffness and strength can be efficiently controlled. In fiberglass, it is the plastic matrix which permanently constrains the structural glass fibers to directions chosen by the designer. With chopped strand mat, this directionality
5880-586: The more biopersistent materials like ceramic fibres, which are used industrially as insulation in high-temperature environments such as blast furnaces , and certain special-purpose glass wools not used as insulating materials remain classified as possible carcinogens ( IARC Group 2B ). The more commonly used glass fibre wools including insulation glass wool , rock wool and slag wool are considered not classifiable as to carcinogenicity to humans ( IARC Group 3 ). In October 2001, all fiberglass wools commonly used for thermal and acoustical insulation were reclassified by
5964-426: The orientation of doors and windows all needed to be taken into account when the cabin was designed. In addition, the source of the logs, the source of stone and available labor, either human or animal, had to be considered. If timber sources were further away from the site, the cabin size might be limited. Cabin corners were often set on large stones; if the cabin was large, other stones were used at other points along
6048-400: The outside so that siding might be applied; they also might be hewn inside and covered with a variety of materials, ranging from plaster over lath to wallpaper . Log cabins were constructed with either a purlin roof structure or a rafter roof structure. A purlin roof consists of horizontal logs that are notched into the gable-wall logs. The latter are progressively shortened to form
6132-446: The sill (bottom log). Since they were usually cut into the sill, thresholds were supported with rock as well. These stones are found below the corners of many 18th-century cabins as they are restored. Cabins were set on foundations to keep them out of damp soil but also to allow for storage or basements to be constructed below the cabin. Cabins with earth floors had no need for foundations. In North America , cabins were constructed using
6216-432: The size of the gap between the logs and reduced the amount of chinking (sticks or rocks) or daubing (mud) needed to fill the gap. The length of one log was generally the length of one wall, although this was not a limitation for most good cabin builders. Decisions had to be made about the type of cabin. Styles varied greatly from one part of North America to another: the size of the cabin, the number of stories, type of roof,
6300-628: The surface with each stroke, all while reducing the load on the pumping unit. Fiberglass rods must be kept in tension, however, as they frequently part if placed in even a small amount of compression. The buoyancy of the rods within a fluid amplifies this tendency. GRP and GRE pipe can be used in a variety of above- and below-ground systems, including those for desalination, water treatment, water distribution networks, chemical process plants, water used for firefighting, hot and cold drinking water, wastewater/sewage, municipal waste and liquified petroleum gas . Fiberglass composite boats have been made since
6384-482: The work is covered with plastic sheets and vacuum is drawn on the work to remove air bubbles and press the fiberglass to the shape of the mold. The fiberglass spray lay-up process is similar to the hand lay-up process but differs in the application of the fiber and resin to the mold. Spray-up is an open-molding composites fabrication process where resin and reinforcements are sprayed onto a mold. The resin and glass may be applied separately or simultaneously "chopped" in
6468-415: The workplace during its fabrication, installation or removal, by breathing it in, by skin contact, or by eye contact. Furthermore, in the manufacturing process of fiberglass, styrene vapors are released while the resins are cured. These are also irritating to mucous membranes and respiratory tract. The general population can get exposed to fibreglass from insulation and building materials or from fibers in
6552-495: Was accidentally discovered in 1932 when Games Slayter , a researcher at Owens-Illinois , directed a jet of compressed air at a stream of molten glass and produced fibers. A patent for this method of producing glass wool was first applied for in 1933. Owens joined with the Corning company in 1935 and the method was adapted by Owens Corning to produce its patented "Fiberglas" (spelled with one "s") in 1936. Originally, Fiberglas
6636-425: Was a glass wool with fibers entrapping a great deal of gas, making it useful as an insulator, especially at high temperatures. A suitable resin for combining the fiberglass with a plastic to produce a composite material was developed in 1936 by DuPont . The first ancestor of modern polyester resins is Cyanamid 's resin of 1942. Peroxide curing systems were used by then. With the combination of fiberglass and resin
6720-523: Was described by Roman architect Vitruvius Pollio in his architectural treatise De Architectura . He noted that in Pontus in present-day northeastern Turkey , dwellings were constructed by laying logs horizontally overtop of each other and filling in the gaps with "chips and mud". Log cabin construction has its roots in Scandinavia and Eastern Europe . Although their precise origin is uncertain,
6804-459: Was not available, often were covered with long hand-split shingles. The log cabin has been a symbol of humble origins in U.S. politics since the early 19th century. At least seven U.S. presidents were born in log cabins, including Andrew Jackson , James K. Polk , Millard Fillmore , Franklin Pierce , James Buchanan , Abraham Lincoln , and James A. Garfield . Although William Henry Harrison
6888-592: Was not born in a log cabin, he and the Whigs were among the first to use them during the 1840 presidential election as a symbol to show Americans that he was a man of the people. Other candidates followed Harrison's example, making the idea of a log cabin a recurring theme in U.S. presidential campaigns. More than a century after Harrison, Adlai Stevenson II said, "I wasn't born in a log cabin. I didn't work my way through school nor did I rise from rags to riches, and there's no use trying to pretend I did." Stevenson lost
6972-529: Was such a log structure, and it was dedicated by President Franklin D. Roosevelt . In 1930, the world's largest log cabin was constructed at a private resort in Montebello , Quebec , Canada . Often described as a log château, it serves as the Château Montebello hotel. The modern version of a log cabin is the log home , which is a house built usually from milled logs. The logs are visible on
7056-443: Was the first type of glass used for fiberglass. E-glass ("E" because of initial Electrical application), is alkali-free and was the first glass formulation used for continuous filament formation. It now makes up most of the fiberglass production in the world, and also is the single largest consumer of boron minerals globally. It is susceptible to chloride ion attack and is a poor choice for marine applications. S-glass ("S" for "stiff")
#416583