Drywall - Wikipedia, the free encyclopedia. Drywall (also known as plasterboard, wallboard, gypsum panel, or gypsum board) is a panel made of calcium sulfate dihydrate (gypsum) with or without additives and normally pressed between a facer and a backer. It is used to make interior walls and ceilings. It was made by layering plaster within four plies of wool felt paper. In 1. 91. 0 United States Gypsum Corporation bought Sackett Plaster Board Company and by 1. Sheetrock. An alternative to traditional wood or metal lath, it was a panel made up of compressed gypsum plaster board that was sometimes grooved or punched with holes to allow wet plaster to key into its surface. As it evolved, it was faced with paper impregnated with gypsum crystals that bonded with the applied facing layer of plaster.
Niles Cynema Soundfield CSF55A In-Wall. The Greatest Thing Since Sliced Drywall. Can I install resilient sound clips over. Staggered layout will help distribute the load of the drywall evenly. All sound tests for any brand. Resilient sound clips are installed directly to the framing roughly. Home Theater Discussions And Reviews > Home Entertainment & Theater Builder > Dedicated Theater Design & Construction > T-bar Or Drywall Ceiling. Do not install your Sound Bar in an area with heavy dust or high humidity. Screws for attachment to the wall are not included.
The sulphur is absorbed by powdered limestone in a process called flue- gas desulphurization (FGD), which produces a number of new substances. This is commonly used in drywall construction in the United States and elsewhere.
The raw gypsum, Ca. SO4. The plaster is mixed with fibre (typically paper and/or fibreglass), plasticizer, foaming agent, finely ground gypsum crystal as an accelerator, EDTA, starch or other chelate as a retarder, various additives that may decrease mildew and increase fire resistance, and wax emulsion or silanes for lower water absorption. The board is then formed by sandwiching a core of the wet mixture between two sheets of heavy paper or fibreglass mats. When the core sets it is then dried in a large drying chamber, and the sandwich becomes rigid and strong enough for use as a building material.
Drying chambers typically use natural gas today. To dry 1 MSF ( 1,0.
Effective decoupling can be accomplished by using Drywall Furring Channel & Resilient Sound Isolation Clips. Soundproofing utilizing clips & channel can. Install Overview (Free) Case Studies; SPC Friends; Testimonials. Resilient channel is a thin metal channel that is intelligently designed to substantially improve the sound insulation of drywall. Make sure that you install the resilient channel as recommended by the manufacturer to gain.
BTU (1,8. 50,0. 00 and 2,6. J) is required. Organic dispersants/plasticisers are used so the slurry will flow during manufacture, and to reduce the water and hence the drying time. Lengths up to 1. 2- feet (3. Common panel thicknesses are 1. Sound transmission may be slightly reduced using regular 5. In addition to increased R- value, thicker drywall has a higher sound transmission class. Thicknesses of plasterboard available are 9.
However four side chamfered drywall is not currently offered by major UK manufacturers for general use. Australia and New Zealand. Panels are commonly sold in 1. Sheets are usually secured to either a timber or steel frame anywhere from 1. Various companies, such as Boral and CSR, manufacture plasterboard under various brand names including Gyprock. Construction techniques.
The bulk drywall sheets are unloaded directly to upper floors via a window or exterior doorway. As an alternative to a week- long plaster application, an entire house can be drywalled in one or two days by two experienced drywallers, and drywall is easy enough to use that it can be installed by many amateur home carpenters. In large- scale commercial construction, the work of installing and finishing drywall is often split between the drywall mechanics, or hangers, who install the wallboard, and the tapers and mudmen, or float crew, who finish the joints and cover the fastener heads with drywall compound. Depending on how significant the finish is to the customer the extra steps in the finish may or may not be necessary, though priming and painting of drywall is recommended in any location where it may be exposed to any wear. Small features such as holes for outlets and light switches are usually cut using a keyhole saw or a small high- speed bit in a rotary tool.
Drywall is then fixed to the wall structure with nails or drywall screws and often glue. Drywall fasteners, also referred to as drywall clips or stops, are gaining popularity in both residential and commercial construction. Drywall fasteners are used for supporting interior drywall corners and replacing the non- structural wood or metal blocking that traditionally was used to install drywall. Their function serves to save on material and labour expenses, to minimize call- backs due to truss uplift, to increase energy efficiency, and to make plumbing and electrical installation simpler. Drywall screws heads have a curved taper, which allows them to self- pilot and install rapidly without having to be punched through the paper cover.
When finished driving, these screws are recessed slightly into the drywall. Screws for light- gauge steel framing have an acute point and finely spaced threads. If the steel framing is heavier than 2.
In some applications, the drywall may be attached to the wall with adhesives. This compound is also applied to any screw holes or defects. The compound is allowed to air dry then typically sanded smooth before painting. Alternatively, for a better finish, the entire wall may be given a skim coat, a thin layer (about 1 mm or 1/1. Another similar skim coating is always done in a process called veneer plastering, although it is done slightly thicker (about 2 mm or 1/8 inch). Veneering uses a slightly different specialized setting compound (. This application uses blueboard, which has special treated paper to accelerate the setting of the gypsum plaster component.
This setting has far less shrinkage than the air- dry compounds normally used in drywall, so it only requires one coat. Blueboard also has square edges rather than the tapered- edge drywall boards. The tapered drywall boards are used to countersink the tape in taped jointing whereas the tape in veneer plastering is buried beneath a level surface. One coat veneer plaster over dry board is an intermediate style step between full multi- coat .
Several builders' books state that thicker drywall reduces sound transmission, but engineering manuals recommend using multiple layers of drywall, sometimes of different thicknesses and glued together, or special types of drywall designed to reduce noise. Sound transmission class (STC) ratings can be increased from 3. Gypsum will soften with exposure to moisture, and eventually turn to a gooey paste with prolonged immersion, such as during a flood. During such incidents, some or all of the drywall in an entire building may need to be removed and replaced.
Furthermore, the paper facings and organic additives mixed with the gypsum core are food for mold. The porosity of the board. This capillary action can result in water spilled at the base of a wall being wicked upwards and damaging the material up to several inches off the ground. Finally, drywall's paper facings are edible to termites, which can eat the paper if they are infesting a wall cavity that is covered with drywall. This causes the painted surface to crumble to the touch, its paper backing material having been eaten. In addition to the necessity of patching the damaged surface and repainting, if enough of the paper has been eaten, the gypsum core can easily crack or crumble without it and the drywall must be removed and replaced.
The drywall may also soften around the screws holding the drywall in place and with the aid of gravity, the weight of the water may cause the drywall to sag and eventually collapse, requiring replacement. In many circumstances, especially when the drywall has been exposed to water or moisture for less than 4.
It is for these reasons that greenboard. Complaints included foul odour, health effects, and corrosion of metal within the structure. This is caused by the emission of sulphurous gases.
The same drywall was sold in Asia without problems resulting. These compounds are emitted from many different types of drywall. A number of lawsuits are underway in many jurisdictions, but many of the sheets of drywall are simply marked, . An investigation by the Consumer Product Safety Commission, CPSC, was underway in 2.
The issue was resolved in 2. US. Fire resistance. In its natural state, gypsum contains the water of crystallization bound in the form of hydrates.
When exposed to heat or fire, this water is vaporised, over a range of temperatures from 8. This makes drywall an ablative material because as the hydrates sublime, a crumbly dust is left behind, which, along with the paper, is sacrificial. Generally, the more layers of Type X drywall one adds, the more one increases the fire- resistance of the assembly, up to four hours for walls and three hours for ceilings.
Type X is typically the material chosen to construct walls and ceilings that are required to have a fire- resistance rating. Fire testing of drywall assemblies for the purpose of expanding national catalogues, such as the National Building Code of Canada, Germany's Part 4 of DIN4. British cousin BS4. For example, the National Research Council of Canada routinely publishes such findings. Generally, exposure of drywall on a panel furnace removes the water and calcines the exposed drywall and also heats the studs and fasteners holding the drywall.
This typically results in deflection of the assembly towards the fire, as that is the location where the sublimation occurs, which weakens the assembly, due to the fire influence. Cosponsored tests result in code recognized designs with assigned fire- resistance ratings. The resulting designs become part of the code and are not limited to use by any one manufacturer. However, individual manufacturers may also have proprietary designs that they have had third- party tested and approved. This is provided that the material used in the field configuration can be demonstrated to meet the minimum requirements of Type X drywall (such as an entry in the appropriate category of the UL Building Materials Directory or in the Gypsum Association Fire Resistance and Sound Control Design Manual) and that sufficient layers and thicknesses are used.
Fire test reports for such unique third party tests are confidential but may be made available to code officials upon special request. It's important to consider deflection of drywall assemblies to maintain their assembly integrity to preserve their ratings. Deflection of drywall assemblies can vary somewhat from one test to another. Importantly, penetrants do not follow the deflection movement of the drywall assemblies they penetrate.
Resilient Bar installation guide Download this as a PDF file here. It is extremely important to install Resilient Bars correctly. Improper installation will nullify any advantage gained from using it in the first place.
There are a few simple procedures that need to be followed when using Resilient Bars. On walls, the Resilient Bars should be mounted at 6.
This allows the plasterboard's weight to draw itself away from the framing. For ceilings, the bars should be spaced at 4. See photo below. Cut- away ceiling plan alongside (1. SBM5 Soundproofing Mat sandwiched between the layers all fixed to Resilient Bars)Cutting of Resilient Bar can easily be carried out with tinsnips or a hacksaw. If fitted to the underside of an existing ceiling that still has the ceiling in place, 5.
Care must be taken to ensure the battens are fixed through to the joists and NOT just to the plasterboard. Resilient Bar is made from thin hot- dipped galvanised steel incorporating a corrugated web to which the plasterboard is screwed. The base flange has rectangular holes which enable the bar to be screwed directly to the stud. The photo shows a Resilient bar System screwed to a stud wall before any plasterboard is installed.
Click here to download our brief PDF pictorial guide for soundproofing a wall with our core products. Bar Installation: The bars should be fixed to joists/battens/studwork using either drywall or self drilling screws at 4.
Plasterboard: A double layer of 1. All joints should be secured to the resilient bar with the appropriate length of self drilling screws at 2. Fixing: Secure the first or thickest layer of acoustic plasterboard to the resilient bar using the appropriate length self drilling screws. It is essential that the screws securing the plasterboard are fixed between the joists and do not come into contact with the joists or battens. It is best to mark the position of the joists and resilient bars by placing marks indicating their position on the walls. Edge Sealant: After fixing the two layers of plasterboard, our Acoustic Sealant should be applied to fill the gaps around the perimeter edges and tooled smooth before decorating. Finishing: All plasterboard joints should be finished with traditional jointing methods and plaster skimmed, if desired, before decorating.
When resilient bars are properly installed, it should be possible to slightly flex the wall or ceiling surface. Also, it usually does not matter which side of the wall is resiliently hung when insulating walls only but a better degree of soundproofing will be achieved if both sides of a stud wall are treated as described above.