Plaster Resource Manual
28Pages

Gold Bond Gypsum Board

Table of Contents SECTION Lath & Plaster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Gypsum Plaster Base and Metal Lath . . . . . . . . . . . . . . . . . . . . . 4 Conventional Plaster Accessories . . . . . . . . . . . . . . . . . . . . . . . . . 5 Basecoat Plasters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Finish Plasters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Problems & Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8...

Lath & Plaster m Provides a smooth, high quality m Control joints should be installed m Requires no joint taping and m Resists nail pops better than gypsum wallboard m Enhances overall wall strength m High impact and abrasion m Masks framing components and mechanical service areas Selecting Plaster Bases National Gypsum Company manufactures all of the most common types of gypsum base plaster and finishing plaster. Conventional gypsum lath and plaster systems have long been considered the industry standard . in wall construction. Gypsum plaster systems are suitable . for all interior...

Gypsum Plaster Base and Metal Lath Kal-Kore® Plaster Base Metal Lath Products* DIAMOND MESH LATH Used as a plaster base and reinforcement 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. Technical Data Kal-Kore is a tapered edge gypsum wallboard plastering base having a blue absorptive face paper surface....

Conventional Plaster Accessories* DOUBLE V EXPANSION JOINT BULL NOSE CORNERBEAD Minimizes cracking in large plaster areas. Also provides ground to assure proper plaster or stucco thickness. Reinforces exterior corners where rounded edges are required. Nose 3/4" radius. Galvanized steel. DOUBLE V CORNER EXPANSION JOINT WIDE FLANGE EXPANDED CORNERBEAD Similar in design to Double V expansion joint but preformed to fit corner angles. Galvanized steel or zinc. Has 3-3/16" expanded flanges . for use on masonry, beams and for column fireproofing. Galvanized steel. EXPANSION JOINT Designed to...

Basecoat Plasters Gold Bond ® brand Two-Way Hardwall Gypsum Plaster Gold Bond ® brand Gypsolite® Plaster Gold Bond Two-Way Hardwall Plaster is a basecoat plaster which requires the job site addition of an aggregate and water to provide working qualities and is designed for interior use over all accepted plaster bases. It may be applied by hand or used through pump/ spray plastering machines. Gold Bond® Gypsolite® is a lightweight gypsum basecoat plaster mixed at the mill with correctly sized and proportioned perlite aggregate, requiring only the . addition of water on the job. It . is...

Finish Plasters PHYSICAL PROPERTIES OF BASECOAT PLASTERS (TYPICAL TEST RESULTS PER ASTM C 472) Plaster Gypsolite Two-Way Hardwall to Two-Way Hardwall Two-Way Hardwall Properties Regular Sand by Weight and Vermiculite and Perlite Regular Masonry Regular Masonry Mix Mill Mix 1:1 1:2 1:3 100 lbs. (45.4 kg) 100 lbs. (45.4 kg) 100 lbs. (45.4 kg) 100 lbs. (45.4 kg) . 2 cu. ft. (.06 m3) 3 cu. ft. (.08 m3) 2 cu. ft. (.06 m3) 3 cu. ft. (.08 m3) Approximate Compressive 900 1600 1150 750 500 300 900 650 . Strength lbs. per sq. in. (kPa) (6201) (11024) (7923) (5168) (3445) (2067) (6201) (4479)...

Lath & Plaster Problems and Solutions Conditions/Causes/  Prevention/Correction Plaster problems are rarely caused by a gypsum plaster product deficiency. In general, most conventional plaster construction problems can be . classified into one of the following categories. m Cracks* m Surface defects, blemishes, stains m Weak or soft plaster m Bond failure m Finish coat problems m Working qualities and setting The cause(s) of these generally are the result of: m Conditions relating to plaster set m Poor quality or incorrect propor- m Structural movement m Improper mixing, application or...

Probable Cause Preventive Action Corrective Action Cracks At Wall Or Ceiling Angles 1. Plaster over gypsum lath. 2. Plaster over masonry. 1. a. Thin plaster. b. Failure to use expanded metal reinforcement. c. Structural movement. 2. Failure to tie walls together. 1. a. Be sure proper plastering grounds are in place. b. Always apply expanded metal reinforcement in all interior angles. c. Follow proper construction practices. 2. Follow proper construction practices. 1. a. Apply second coat of plaster to proper thickness. b. Cut out plaster and patch. c. Patch cracks. 2. Patch cracks. Cracks...

Probable Cause Preventive Action Corrective Action Soft, White, Chalky Surface Basecoat over any . plaster base. Usually occurring during dry, hot weather. Too much ventilation has removed water from the plaster before it has set. Called “dry-out”. Screen openings to minimize drafts during dry, hot weather and spray the surfaces and floors with water during the setting period. Spray dried out areas with water or a solution of alum (1 lb. alum per 3 gallons of water). Soft, Dark, Damp Plaster Surface Basecoat over any . substrate. 1. DAMP WEATHER - too little ventilation during damp weather,...

Probable Cause Preventive Action Corrective Action BOND FAILURE OF BASECOAT (cont.) Separation Of Gypsum Plaster From Monolithic Concrete Surface Basecoat over monolithic concrete. Concrete bonding agent not Apply plaster bonding agent applied. per ASTM specification – before application of plaster. No correction – remove the plaster and replaster. Brown Coat Plaster Separating From Scratch Coat Plaster Three-coat plaster work. 1. Weak scratch coat plaster. 1. See preventive actions No correction – remove the 2. Failure to provide adequate under weak, soft plaster. plaster and replaster....