Lath Wikipedia. Sawn lath seen from the back with hardened plaster from the other side showing through. Sawn lath became popular after the introduction of the circular saw in the early to mid 1. Roof laths span across between the rafters and support the wood shingles. A lath or slat is a thin, narrow strip of straight grained wood used under roof shingles or tiles, on lath and plaster walls and ceilings to hold plaster, and in lattice and trellis work. Lath has expanded to mean any type of backing material for plaster. This includes metal wire mesh or expanded metal that is applied to a wood or metal framework as matrix over which stucco or plaster is applied, as well as wallboard products called gypsum or rock lath. Historically, reed mat was also used as a lath material. One of the key elements of lath, whether wooden slats or wire mesh, are the openings or gaps that allow plaster or stucco to ooze behind and form a mechanical bond to the lath. This is not necessary for gypsum lath, which relies on a chemical bond. EtymologyeditThe word is recorded from the late 1. Old English word le, a variant of the word ltt. This in turn would seem to stem from a Proto Germanic word ao, from which have sprung words in many Germanic languages, e. Dutchlat, German. Gypsum%20Board%20Assembly_Structural%20Detail_Closure%20Detail%20at%20Beam_xlarge_800.jpg?w=798' alt='Type Of Gypsum Board Pdf To Word' title='Type Of Gypsum Board Pdf To Word' />British Gypsum encasements give an assured level of fire protection to structural steelwork. They present high quality claddings with or without supplementary framing. GOLD BOND brand FIRESHIELD GYPSUM BOARD Technical Information 800NATIONAL 8006284662 Description Gold Bond brand FireShield Gypsum Board consists of a fire. Bcal1049 rev. 417 ms word 5 state of michigan rick snyder governor department of licensing and regulatory affairs lansing shelly edgerton director. Backdraft or Smoke Explosion. While smoke explosion and backdraft are often confused, there are fairly straightforward differences between these two extreme fire. GOLD BOND brand. GRIDSTONE GYPSUM. CEILING PANELS. Technical Information 800NATIONAL. Description. Gold Bond brand. Gridstone Gypsum Ceiling. Latte the root has also found its way into Romance languages, cf. Italianlatta, Frenchlatte, and is related to German lade, laden denoting a board, plank, sash, shutter, counter and hence also a shop. Types of LatheditRiven lath, each piece has been split from a log. Wooden LatheditWooden slat laths are still used today in building construction to form a base or groundwork for plaster, but modern lath and plaster applications are mostly limited to conservation projects. Tiles, slates, and other coverings on roofs and walls are often fastened to laths, sometimes also called battens or slats. Such strips of wood are also employed to form lattice work, or are used as the bars of Venetian blinds, and window shutters. Lath is also used on many tobacco farms in the Connecticut Valley as a means to carry and hang the plant in barns. This is achieved by using one of two methods hooking or spearing. A spear lath is a regular lath that is held in an upright position. A worker then mounts a spear on top and spears the tobacco onto the lath. The other form of lath is called hook lath, which has small hooks attached that allows workers to hook the stems of tobacco plants onto the lath, often between two lengths of twine attached to the lath and twisted mechanically. Laths were also used to fix reeds to a timber structure before plastering. In Cape Cod, laths were used in the early 1. Historically there were three ways of making wood lath for plaster riven lath, accordion lath, and circular sawn lath. Riven lath was traditionally split with the grain from chestnut, oak, and similar hardwoods, or from softwoods like eastern white pine. JCSTvRwMnYrf/Drywall-Gypsum-Board.jpg' alt='Type Of Gypsum Board Pdf To Word' title='Type Of Gypsum Board Pdf To Word' />Individual laths were riven and nailed in place. Because they are split with the gain, riven lath is stronger than later forms of lath production. Accordion laths are thin, sawn boards that are partially split with a hatchet or axe. The splits are then spread apart to form gaps for the plaster to key into. The name derived from the spreading action, which is like pulling an accordion open. After the circular saw came into use in the early 1. Counter latheditCounter lath is a term used in roofing and plastering for a piece of wood placed perpendicular to the lath. In roofing, a counter lath is a slight piece of timber parallel with and between common rafters to give the lath extra support, or a lath placed by eye between every two gauged ones. When plastering, sometimes a counter lath is placed perpendicular to the lath as a fillet a thin, narrow strip of material to space the lath off of the surface to allow the plaster to pass through the lath and create a key. Metal lathedit. Bostwick Steel Lath Company advertisement for steel truss loop type metal lath in 1. Metal lath dates from the late 1. In addition to providing a matrix to which the stucco can adhere, metal lath adds strength and rigidity. Metal lath can be stapled directly to studs, and is capable of bending to easily form corners and curves. Three coats of plaster are required when using metal lath. Several types of metal lath have been developed for a variety of applications Expanded metal lath is made by slitting and pulling apart a thin sheet of metal, which produces diamond shape holes through which the plaster can form keys. Ribbed lath is made from slit and expanded metal with V shaped ribs which give it more stiffness, and is designed to span larger distance between framing supports. Self furring lath is an expanded metal lath which is dimpled to hold itself off from a solid surface. Wire lath is made from welded or woven wires and is similar to hardware cloth. Paper backed wire lath is wire lath with building paper attached. Strip laths is metal lath that is several inches wide and is often used to reinforce joints and on corners. Tv Broadcasting Software Crack Download there. Corner lath is pre bent for use in making corners. Wire mesh used on inside corners to prevent cracking is called Cornerite. Gypsum LatheditGypsum lath rock lath consists of gypsum plaster sandwiched between two sheets of absorbent paper. The finish side to which plaster is trawled is treated with gypsum crystals for the plaster to chemically bond to and is sometimes perforated to allow mechanical bonding. It was commonly used in place of wood lath since it is noncombustible, easy to use, and can give better results. Gypsum board can be purchased in sheets of various sizes and screwed or nailed directly onto a buildings studs. Due to its rigidity, it is most suited for use on straight walls. Gypsum board was improved in 1. Gypsum lath is available with a foil facing which acts as a vapor barrier and heat reflector, and as a veneer base for plaster veneer. Keys are formed by plaster that oozes through the spaces or gaps between wooden lath, or the holes in metal lath, and around to the laths backside. Honda Civic Manual Transmission Linkage'>Honda Civic Manual Transmission Linkage. This secures the plaster to the lath by creating a sort of hook. Wooden and metal lath depend on the mechanical bond created by keys to adhere the plaster to the lath. FramingeditLath can be attached directly to the fame of a building, such as the studs of a wooden structure. Alternatively, lath can be attached to a wooden or metal frame called a furning, which is then attached to the building structure. Furnings are often used in masonry construction. Frames are also used when using lath and plaster to create decorative, curved, or ornamental work. Lath Failureedit. Lath with sections of failing and failed sections. There are several reasons that a plaster and lath wall may fail. First, the lath itself can sometimes pull away from the frame on which it is mounted. This is generally due to the use of non galvanized nails. The lath can also fail because of decay from moisture or insect damage. Moisture can also cause wooden lath to expand and contract, causing the plaster around it to crack. Additionally, failure can also occur in the plaster keys. Over time, the keys can deteriorate and crack, weakening their ability to hold the plaster onto the lath. The addition of hair in plaster helps to prevent this by adding strength.