® 09 23 00/NGC Gold Bond BRAND 09 26 13/NGC Plaster Resource Manual Table of Contents How to use We’ve even included a glossary of plaster terms and definitions. SECTION PAGE this Manual For technical inquiries, contact our Lath & Plaster............................................ 3 Designed for contractors, architects and specifiers, this useful manual Technical Services Department at Gypsum Plaster Base and Metal Lath .................... 4 contains a broad range of helpful 1-800-NATIONAL (628-4662), or information about our lath and fax 1-800-FAX-NGC1 (329-6421). Conventional Plaster Accessories ........................ 5 plaster systems and veneer plasters. You can also access our Internet home page at nationalgypsum.com Basecoat Plasters ....................................... 6 Since conventional lath and plaster or nationalgypsum.com/espanol. differs from veneer plaster, we’ve Finish Plasters .......................................... 7 simplified the manual by dividing it Note: Further information on into two distinct sections. our plaster products is available Problems & Solutions ................................... 8 in National Gypsum Company’s The first section contains descriptions Veneer Plaster .......................................... 13 Gypsum Construction Guide. of our gypsum plaster systems including Veneer Plaster System Components .................... 14 lath, metal accessories and plasters. You’ll also find construction recom- Veneer Plaster Accessories ............................. 16 mendations to help you get the Recommendations ..................................... 17 most from this conventional finish. The second section, devoted to Problems & Solutions .................................. 21 veneer plaster, features descriptions ® Glossary ................................................ 26 of our products including Uni-Kal , X-KALibur® and Kal-Kote®, along with a comparison of one-coat and two-coat systems. In both sections, we look at unique conditions common to plaster finishes, and we recommend solutions to these problems. 2 Lath & Plaster 09 23 00/NGC Features/Benefits Recommendations m Provides a smooth, high quality m Control joints should be installed surface in ceilings without perimeter m Requires no joint taping and relief with a maximum distance finishing between joints of 30' with a maximum undivided area of m Resists nail pops better than 900 sq. ft. With perimeter relief, gypsum wallboard the maximum distance between m Enhances overall wall strength joints is 50' with a maximum undivided area of 2500 sq. ft. m High impact and abrasion On side walls, control joints resistance should be installed every 30'. m Masks framing components and m Where dissimilar plaster bases mechanical service areas adjoin, use strip-metal lath with Selecting 15 lb. felt paper between the Plaster Bases metal lath and underlying base. m National Gypsum Company manu- Carefully inspect all lath and fur- factures all of the most common ring before plastering to ensure types of gypsum base plaster and adherence to job specifications finishing plaster. and good practice standards. m These products perform well Select from the suggested in appearance, structural ability, specifications that accompany Description General Uses sound isolation and fire endur- the description of each system. ance ratings, allowing architects to Conventional gypsum lath and Gypsum plaster systems are suitable PRODUCT SHELF LIFE plaster systems have long been for all interior plastering except design virtually any number of ceilings and partitions. Storage/ considered the industry standard areas directly exposed to free Product Shelf Life in wall construction. water or severe moisture. Lath Two-Way Hardwall 6 months and plaster is not recommended Performance Ideal for both residential and Gypsolite® Plaster 6 months commercial applications, lath and for exterior applications such as The relative performance of gypsum carports, soffits and open porches. and metal lath varies depending Gauging Plaster 3 months plaster systems provide smooth, Molding Plaster 3 months high quality wall surfaces, regardless Gypsum plasters are non-com- on the type of construction. When of framing alignment. bustible and act to prevent passage plaster on metal lath forms a mem- brane, as in a suspended ceiling or Lath and plaster deliver exceptional of intense heat from fire for extended periods. For specific fire resistance hollow partition, it’s more subject beauty and durability in interior to cracking than plaster on gypsum partitions and non-loadbearing ratings, see National Gypsum’s Gypsum Construction Guide. lath. On solid partitions, metal lath exterior walls. Conventional plaster is generally less subject to plaster systems are also commonly used cracking than gypsum lath. as the panel material for radiant heating systems in ceilings. When used with expanded metal lath, conventional plasters create a mechanical bond for maximum strength and durability. Gypsum plasters are also excellent for sculpting, casting decorative objects, and historic restoration. 3 Gypsum Plaster Base and Metal Lath Kal-Kore® Plaster Base Metal Lath Products* DIAMOND MESH LATH Used as a plaster base and rein- forcement on almost all types of walls and ceilings, over wood or steel framing, flat or curved surfaces. SELF-FURRING DIAMOND MESH LATH Used extensively in stucco work, as a plaster reinforcement over interior masonry walls, and in steel column fireproofing. The self-furring dimples hold the metal lath 1/4" away from the surface to be plastered. Description Technical Data 1/8" FLAT RIB LATH Kal-Kore® is a tapered edge gypsum Kal-Kore is available in two basic Designed to meet the demand for wallboard plastering base having a types: Regular and Fire-Shield Type rigid expanded metal lath used as blue absorptive face paper surface. X. Kal-Kore is 4' wide and is sup- a plaster base in all types of work. Although specifically designed as plied in 8’ through 16’ lengths. Widely used as reinforcement for a base for veneer plaster, it also Thicknesses are as follows: basecoat in ceramic tile work. provides an excellent base for con- Regular: 3/8" and 1/2". ventional basecoat plasters such as Gypsolite or Two-Way Hardwall. Fire-Shield: 1/2" Fire-Shield C, 5/8" Fire-Shield, 5/8" Fire-Shield C, produced to meet ASTM C 588/ C 1396. 3/8” RIB LATH Note: Installation of gypsum lath The 3/8" rib lath is used for ceilings and metal lath shall be in accor- under steel joist construction and dance with ASTM C 841. Do not metal reinforced concrete floors. It use 3/8" Kal-Kore Plaster Base with is also recommended for concrete conventional basecoat plasters. slab floors over steel joists. * Metal products are not manufactured by National Gypsum Company. 4 Conventional Plaster Accessories* DOUBLE V EXPANSION JOINT BULL NOSE CORNERBEAD Minimizes cracking in large plaster Reinforces exterior corners where areas. Also provides ground to rounded edges are required. Nose assure proper plaster or stucco 3/4" radius. Galvanized steel. thickness. DOUBLE V CORNER WIDE FLANGE EXPANDED EXPANSION JOINT CORNERBEAD Similar in design to Double V Has 3-3/16" expanded flanges expansion joint but preformed to for use on masonry, beams and for fit corner angles. Galvanized steel column fireproofing. Galvanized or zinc. steel. EXPANSION JOINT L RUNNER Designed to relieve stresses in Perforated – Ceiling or floor large gypsum and portland cement support for 2" solid lath plaster areas. Material will expand and plaster partition. and contract to allow for 1/8" Plain – Ceiling support for 2" to 5/8" opening. Incorporates a solid wallboard partition using 1" weather resistant joint. Galvanized shaftliner. steel or zinc. EXPANDED FLANGE COLD ROLLED STEEL SQUARE CASING CHANNEL Has short, 90 degree return at plaster Used as studs for attaching metal surface, serving as a plastering stop. lath in 2" solid partitions. For furring or runners in suspended ceilings. EXPANDED CORNERBEAD BEAM FURRING CLIP The 2-1/2" expanded flange ends Used to attach lath to flanges of 1/4" from the nose of the bead steel beams, joists and columns. providing reinforcement where Tempered spring steel. needed most. * Metal products are not manufactured by National Gypsum Company. 5 Basecoat Plasters Gold Bond ® BRAND Gold Bond ® BRAND Two-Way Hardwall Gypsum Plaster Gypsolite® Plaster Description Description Gold Bond® Two-Way Hardwall Gold Bond® Gypsolite® is a light- Plaster is a basecoat plaster which weight gypsum basecoat plaster requires the job site addition of an mixed at the mill with correctly aggregate and water to provide sized and proportioned perlite working qualities and is designed aggregate, requiring only the for interior use over all accepted Strength addition of water on the job. It High Insulating Value plaster bases. It may be applied by Two-Way Hardwall Plaster properly is manufactured to be trowel- Gypsolite has a “k” factor of 1.5 hand or used through pump/ spray proportioned with aggregate forms applied over gypsum plaster base, which provides about 3-1/2 times the plastering machines. a hard, durable base for the finish and in some cases metal lath insulating value of sanded plaster. (see LIMITATIONS.) Features/Benefits coat. Its high tensile and compres- Fire Resistance sive strength results in increased Gypsolite has excellent fire-resistive Controlled Uniformity Features/Benefits resistance to minor structural qualities and generally provides fire Two-Way Hardwall Plaster is set- Uniform Strength and movements,