Type X fire rated gypsum drywall that is 5/8 -inch (15.9mm) thick and installed on each side of nominal 2-inch x 4-inch (38x89mm) wood studs spaced 16-inch (400mm) o.c. or 3-5/8 inch (610 mm) steel studs spaced 24" o.c. has a minimum fire rating for the assembly of 1 hour, which is a typical requirement for many building codes.. Type C fire rated drywall (sometimes referred to as Improved ...

About products and suppliers: The robust water proof gypsum powder board. on Alibaba.com offer revolutionary techniques in the construction sector.They process gypsum powder excellently to come up with exciting and elegant construction products. Made of sturdy materials, they are amazingly durable because they endure the tough conditions they work in, including dust, heat, and mechanical impacts.

- Have water resistant agent (Siloxane) compare to standard gypsum board. Features and Benefits. Formulated with water repellent additives and encased in specified moisture-resistant face and back liner papers. Designed to perform in compliance with the building codes. Suitable for …

Steps to repair water damaged gypsum board ceilings. Step 1. If the ceiling has been water damaged, it will often sag down. Press the gypsum board up against the joist and secure it tightly along the seam with drywall nails or screws driven into the center of the joist. Step 2. Water can bleed through normal primer.

Gypsum is a popular material widely used in construction and known for its fire-resistant qualities. One of its more popular construction uses is gypsum wall board, also known as drywall or Sheetrock®. Though the material's positive attributes outweigh the negatives, gypsum's limitations are worth discussing.

Answer (1 of 2): Gypsum is calcium sulphate dihydrate CaSO4.2H2O Calculate the molecular weight Ca=40.078 S=32.06 O=15.999 x 6 =95.994 H=1.008 x 4 = 4.032 = 172.64 the two water of crystallization have a molecular weight of 34.014 (four hydrogens two oxygens) therefore the percentage of water...

ABSTRACT OF THE DISCLOSURE Disclosed are a composite gypsum board and a method of preparing composite gypsum board. The board contains at least one set gypsum layer sandwiched between two cover sheets. The set gypsum layer is formed from at least stucco and water. The stucco material generally includes a high salt impurity content, for example, when the stucco is calcined from …

1/4 – inch (0.635 cm) – A low-cost gypsum board used as a base in a multilayer application for improving sound control, used to cover existing walls and ceilings in remodelling and for curved surfaces.Generally, a gypsum ceiling board is an ideal choice for home décor. 3/8 – inch (0.9525 cm) – A gypsum board principally applied in a double-layer system over wood framing and as a face ...

ProRoc® Moisture Resistant Type X – gypsum (noncombustible) with proprietary formula for fire resistance performance and hydrophobic treatment. EDGE Tapered, paper bound – factory finished END Square – factory cut PRODUCT STANDARDS • CAN/CSA-A82.27 Gypsum Board • ASTM C 1396 Gypsum Board • ASTM C 630 Water-resistant Gypsum Backing ...

GYPSUM BOARD. Gypsum wallboard, gypsum sheathing, gypsum baseforgypsum veneerplaster,exteriorgypsum soffit board, predecorated gypsum board or water-resistant gypsum backing board complying with the standards listed in Tables 2506.2, 2507.2 and Chapter 35. GYPSUM PLASTER. A mixture of calcined gypsum or cal-

water. The calcined gypsum (or hemihydrate) (CaSO 4 l 1/2H 2O) pow-der is then used in producing the base for gypsum plaster, wallboard and other gypsum products. To produce gypsum board, the calcined gypsum is mixed with water, and additives to form a slurry which is fed between continuous sheets of paper on a continuous belt line. As

National Gypsum Company is the exclusive service provider for products manufactured by Gold Bond Building Products, LLC, PermaBASE Building Products, LLC and ProForm Finishing Products, LLC.

Gyproc Moisture Resistant consists of an aerated gypsum core with water repellent additives encased in, and firmly bonded to, strong moisture resistant paper liners that are green in colour. It has some unique features such as water resistant, ease of finishing, & tile fixing.

Gypsum Board This type of wallboard is the most common material used on walls in home construction. Gypsum board is not the best choice of material for bathroom walls, however. When exposed to moisture, which any wallboard will be in a bathroom, gypsum board swells, molds and deteriorates.

Does water damage cause black mold? Stachybotrys chartarum is a greenish-black mold. It can grow on material with a high cellulose content, such as fiberboard, gypsum board, and paper. Growth occurs when there is moisture from water damage, water leaks, condensation, water infiltration, or flooding. Constant moisture is required for its growth.

The water or moisture to which the gypsum board was exposed was uncontaminated1. The gypsum board can be dried thoroughly before mold growth begins (typically 24 to 48 hours depending on environmental conditions). The gypsum board is structurally sound and there is no evidence of rusting fasteners or physical damage that

Traditional gypsum board products do not like water. Some of the new panels and boards are designed to function better in a moist or wet environment; however, the regular wallboard that is the most familiar to applicators must be kept dry. GA-216, "Application and Finishing of Gypsum Panels Products," is very clear when it addresses water ...

Since they were introduced over 100 years ago, Sheetrock® Brand gypsum panels have consistently set the standard for the highest-quality and best performing walls and ceilings. The most popular drywall on the market. #1 in highest overall quality. Easiest to score and snap. "USG is at the cutting edge with gypsum …

The invention provides in one embodiment a gypsum-containing slurry including stucco and an aqueous pre-dispersion of a pregelatinized starch. Also provided is a method of making gypsum wallboard by providing a pre-dispersion of the pregelatinized starch in water, and adding the pregelatinized starch pre-dispersion to the gypsum-containing slurry.

The panel is manufactured with a wax-treated, water-resistant core faced with water-repellent paper on both face and back surfaces and long edges. Exterior Gypsum Sheathing is available in 1/2" & 5/8" thick, 4' wide square edge product. 5/8" Exterior Gypsum Sheathing has a …

The different types of gypsum board are standard board, foil-backed gypsum, abuse-resistant board, core board, fire-resistant gypsum board, moisture-resistant, water-resistant gypsum board and paperless gypsum board. Gypsum is naturally available in shades of white, yellow, red, brown and grey. Gypsum boards can have laminate, wallpaper and ...

Gypsum (CaSO4) is a water soluble mineral that can be found in fertilizers and mixed in many other products. It is pH neutral, therefore, its application does not have the risk associated with alum treatments. Gypsum works for water clarification by attracting clay particles together to form clumps or what we call floccules.

Since 1965, Georgia-Pacific Gypsum has been committed to developing the highest quality gypsum building products in the industry. Our versatile ToughRock ® gypsum boards are ideal for a wide range of commercial and residential interior applications, and our Dens ® family of high-performance fiberglass mat-faced gypsum products offer exceptional strength and superior moisture, …

Water and Drywall. Drywall is a rigid panel made of white gypsum mineral rock sandwiched between thick exterior paper. Its main drawback is the fact that it absorbs water readily. This can present significant water-related issues, including the following: Once saturated, drywall tends to retain water and dry very gradually.

The different types of gypsum board generally available in the market are clued wallboard, backing board, core board, fire-resistant gypsum board, water-resistant gypsum board, and gypsum form board. Gypsum board also is known as drywall, plasterboard, or wallboard is used to form panels made of gypsum plaster pressed between two thick sheets ...

Water-resistant gypsum backing board, however, cannot be used in areas where it will have direct exposure to water or continuous high humidity. Additionally, on ceilings, 1/2-inch panels cannot be used when the framing spacing exceeds 12 inches or for 5/8-inch panels when the …

Gypsum board is occasionally mistakenly identified as the culprit when water vapor has been found to have condensed and collected in a wall cavity between the interior wall surface and the exterior sheathing; some builders have even asserted that evaporation from drying joint compound is sufficient to result in condensation in wall cavities ...

XP® Gypsum Board was designed to provide extra protection against mold and mildew compared to standard gypsum board products. The face paper is folded around the long edges to reinforce and protect the core, and the ends are square-cut and finished smooth. Long edges of the panels are tapered. With PURPLE® paper on the face side and heavy ...

Water-resistant gypsum backing board shall not be used in the following locations: . Over a vapor retarder in shower or bathtub compartments. Where there will be direct exposure to water or in areas subject to continuous high humidity.; On ceilings where frame spacing exceeds 12 inches (305 mm) o.c. for 1 / 2-inch thick (12.7 mm) water-resistant gypsum backing board and more than 16 inches ...

Greenboard is a water-resistant gypsum board or drywall panel that came out in the 1960's. The product is essentially a more durable gypsum board. It has the same gypsum core that you'll find on standard drywall all over homes, but it comes with a thicker coating of paper that's protected by wax for water …

Gypsum rock is first mined or quarried, then crushed and ground to a fine powder. It then goes through a process called calcining where heat at 350 degrees is supplied to the gypsum powder which removes 3/4 th of the water molecules. Hemihydrate is the name of calcined gypsum which is then used in gypsum board, gypsum plaster, and other products.

C.Water Resistant Gypsum Backing Board: ASTM C1178, Type X, 16 mm (5/8 inch) thick. D.Paper facings shall contain 100 percent post-consumer recycled paper content. 2.2 GYPSUM SHEATHING BOARD

First of all, gypsum board products have a certain level of water in the paper, and water is chemically bound into the gypsum itself. Under normal circumstances, this water is not detrimental to the performance of the gypsum board. It is well known that gypsum board products are subject to damage by water and high humidity.