Gold Bond brand ® Plaster Resource Manual 09 23 00/NGC 09 26 13/NGC
Table of Contents SECTION PAGE Lath & Plaster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Gypsum Plaster Base and Metal Lath . . . . . . . . . . . . . . . . . . . . . 4 Conventional Plaster Accessories . . . . . . . . . . . . . . . . . . . . . . . . . 5 Basecoat Plasters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lath & Plaster 09 23 00/NGC Features/Benefits Recommendations m Provides a smooth, high quality m Control joints should be installed surface m Requires no joint taping and finishing m Resists nail pops better than gypsum wallboard m Enhances overall wall strength m High impact and abrasion resistance 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.
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 .
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 .
Basecoat Plasters Gold Bond ® brand Two-Way Hardwall Gypsum Plaster Gold Bond ® brand Gypsolite® Plaster Description Description 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 .
Finish Plasters PHYSICAL PROPERTIES OF BASECOAT PLASTERS (TYPICAL TEST RESULTS PER ASTM C 472) Plaster Properties Gypsolite Regular Mix . . . Approximate .Compressive . . . . .Strength .lbs . .per .sq . .in . .(kPa) . Approximate .Tensile . . . . .Strength .lbs . .per .sq . .in . .(kPa) . Mill .Mix . . 900 . . (6201) . 160 . . (1102) . Two-Way Hardwall to Sand by Weight 1:1 . . 1600 . . (11024) . 250 . . (1722) . 1:2 . . 1150 . (7923) . 190 . (1309) . 1:3 . . 750 . (5168) . 120 . (827) .
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 . action m .Painting .plaster The .cause(s) .
Construction Probable Cause Cracks At Wall Or Ceiling Angles 1. Plaster .over .gypsum .lath . 2. Plaster .over .masonry . 1. a. Thin .plaster . 1. a. Be .sure .proper .plaster- 1. a. Apply .second .coat .of . b. Failure .to .use .expanded . ing .grounds .are .in .place . plaster .to .proper .thickness . metal .reinforcement . . b. .Always .apply .expanded . b. Cut .out .plaster .and . c. .Structural .movement . metal .reinforcement .in .all . patch . 2. .Failure .to .tie .walls . interior .angles . c.
Construction 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).
Condition Construction 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.
Condition Construction Probable Cause Preventive Action Corrective Action 1. Basecoat plaster too dry. 2. Finish coat mixed too stiff. Follow good plastering practices. 1. Apply finish coat over green base or spray the dry base lightly with water before finishing. 2. Use correct amount of water when mixing finish coat. FINISH COAT PROBLEMS (cont.) Finish Coat Works Hard Gypsum finish over basecoat.
Veneer Plaster 09 26 13/NGC Two-Coat System Features/Benefits (Kal-Kote®) m .Kal-Kote .System .may .be .used . for .plaster-embedded .electric . radiant .heating .cable .systems . m .Same .application .techniques .as . for .conventional .plaster . m .Greater .crack .resistance .than . one-coat .systems . m .Can .be .applied .directly .to . concrete .block . Limitations m .Not .recommended .for .exterior . use .or .where .subject .to .weathering, .direct .water .contact .or . temperature .
Veneer Plaster System Components SPECIFICATIONS Size 4' .x .8' . (1219 .mm .x .2438 .mm) 4' .x .8', .12' . . (1219 .mm .x .2438 .mm, .3657 .mm) . 4' .x .8', .12' . .(1219 .mm .x .2438 .mm, .3657 .mm) . 4' .x .8', .12' . .(1219 .mm .x .2438 .mm, .3657 .mm) . Thickness 3/8" .(9 .5 .mm) . Edge Tapered . 1/2" .(12 .7 .mm) . Tapered . 1/2" .(12 .7 .mm) FSK-C 5/8" .(15 .9 .mm) . Tapered . FSK 5/8" .(15 .9 .mm) . Tapered . Pcs./Bdl. 2 2 2 2 FASTENERS FOR ATTACHING KAL-KORE Framing Screw . Studs .& .
Kal-Kote® Base Plaster Kal-Kote® Smooth Finish Kal-Kote Base Plaster is a specially designed high strength basecoat plaster for application 1/16" . minimum thickness over Kal-Kore, masonry or monolithic concrete that has been treated with a . bonding agent. Kal-Kote Smooth Finish is designed to provide a white smooth trowel finish using conventional plastering techniques. Apply not exceeding 1/16" over Kal-Kote Base.
Veneer Plaster Accessories* Used in Both One-Coat and Two-Coat Systems VENEER CORNERBEAD E-Z STRIP® CONTROL JOINT Formed .of .galvanized .steel .to .protect . exterior .corners .with .veneer .plastering . .Flange .length .1-1/4" . . Designed .for .drywall .or .veneer . plaster .systems . .A .vinyl .extrusion . used .as .an .expansion .or .control . joint .for .ceilings .or .partitions . . EXPANDED VENEER CORNERBEAD KAL-MESH TAPE Used .as .an .alternate .to .the .KalKorner .Bead .for .exterior .
Recommendations Veneer Plaster for Metal and Wood Framing 1. Wood Studs or Joists. Wood members shall meet the minimum requirements of local building codes. Framing shall not exceed spacing shown on page 14. Most partition fire ratings require that Kal-Kore be applied vertically. When such ratings are not required, horizontal application may be used to minimize joints. For ceilings, application at right angles to framing is preferred. 2. Metal Studs.
Kal-Mesh Treatment Method Do not use self-adhering mesh. 1. Center and secure Kal-Mesh over all joints and interior angles with 1/4" or 5/16" staples. 2. Position staples a maximum of 24" apart as follows: A. Joints: at alternate edges for the run from end to end and directly opposite one another at either end. B. Angles: along ceiling edge only for wall-to-ceiling angles. Along one edge for wall-to-wall angles. 3.
Smooth Finish Over Basecoat 1. Apply only over properly pre- pared Kal-Kote basecoat plaster. Scratch-in tightly, then double back with material from the same batch immediately to create a uniform coat not exceeding 1/16" in average thickness. 2. Remove trowel marks, “cat faces,” and other major surface imperfections by “drawing-up” or “laying down” the surface with light trowel pressure when plaster has stiffened.
Recommendations 1. Surface must be free from dirt, grease, oil, mold, parting agents, or any material which will prevent plaster adhesion. 2. When erecting masonry, strike joints flush. If masonry has recessed joints, fill joints flush to masonry surface with basecoat plaster, Uni-Kal or X-KALibur and allow to set. Exterior Corners Install cornerbead with adhesive at least 4 and preferably 16 hours before plastering. Apply a continuous .
Veneer Plaster Problems and Solutions Conditions/Causes/ Prevention/Correction Veneer plaster problems are generally related to job conditions or abuses and marginal or improper plastering techniques or practices and infrequently to a product quality deficiency.
Condition Probable Cause Preventive Action Corrective Action 1. Large gaps between adjacent plaster base boards. 2. Improper/insufficient number/ location of fasteners. 3. Gypsum base board edges damaged. 4. Wrong type or no reinforcing mesh used. 5. Joints not pre-treated prior to general plastering. 6. Rapid drying conditions. 1–3. Apply undamaged plaster base board according to . recommended procedures using proper fastening. 4/5.
Condition Probable Cause Preventive Action Corrective Action 4. Excessive use of retarder to slow setting, so partial dry-out occurs. 5. Adulteration of the plaster on the job site by addition of substances other than clean graded silica sand or excessive use of sand. 6. Application of plaster over improper substrate. 7. Application of plaster over contaminated substrate, dust, dirt, oil, soot, etc. 8. Application of plaster over substrate with excessively high suction – too high absorptivity. 9.
Condition Probable Cause Preventive Action Corrective Action PLASTER APPLICATION CONDITIONS (cont.) Quick Set 1. Dirty equipment. 2. Excessive mixing. 3. Contaminated mixing water. 4. Plaster has become wet or contaminated prior to mixing. 5. Excessive use of accelerator. 6. Excessively low air/plaster mix, water temperatures below 40°F (4°C). 7. Partial bag mixed. 1. Follow recommended clean-out procedures. 2. Do not exceed 5 minutes mixing time. 3. Use only potable water. 4.
Condition Probable Cause Preventive Action Corrective Action 1. “Double-back” coat of finish troweled over “scratch” coat which has stiffened excessively or set. 2. Trowel pressure during “drawup” too strong for stiffness and thickness of finish. 1. “Scratch” and “double-back” with finish from the same batch, minimizing time between coats. 2. Use only light, even trowel pressure when “drawing-up”. See Prevention. 1. Plaster not completely dry. 2. Wrong type of paint used. 3. Plaster surface chalky.
Glossary of Terms Accelerator . . . . . . . . . . . . . . . . . . . . A substance used to shorten or speed up the setting action (time) of the plaster. Admixture . . . . . . . . . . . . . . . . . . . . . A substance other than water, or aggregate added to the plaster to alter its properties. Aggregate . . . . . . . . . . . . . . . . . . . . . An inert material used as a filler or texturing aid. Anhydrite . . . . . . . . . . . . . . . .
Lean Mixture . . . . . . . . . . . . . . . . . . High aggregate to plaster ratio; often exhibits poor working qualities. Light Weight Aggregate . . . . . . . . Expanded perlite or vermiculite. Lime . . . . . . . . . . . . . . . . . . . . . . . . . . Oxides or hydroxides of calcium or calcium and magnesium. Lime Putty . . . . . . . . . . . . . . . . . . . .
CUSTOMER SERVICE SALES AREAS m Atlantic Area Phone: (800) 237-9167 . Fax: (877) 252-0430 m Central Area Phone: (800) 252-1065 . Fax: (866) 232-0440 m Gulf Area Phone: (800) 343-4893 . Fax: (866) 482-8940 m Midwest Area Phone: (800) 323-1447 . Fax: (866) 692-8590 m Northeast Area Phone: (800) 253-3161 . Fax: (866) 632-1480 m Southeast Area Phone: (800) 548-9394 . Fax: (866) 732-1990 m Southwest Area Phone: (800) 548-9396 . Fax: (866) 792-7520 m Western Area Phone: (800) 824-4227 .
