VA 09 26 00-2011 VENEER PLASTERING.pdf

1、10-11 09 26 00 - 1 SECTION 09 26 00 VENEER PLASTERING PART 1 GENERAL 1.1 DESCRIPTION This section specifies veneer plaster and veneer plaster base. 1.2 RELATED WORK A. Metal framing: Section 09 22 16, NON-STRUCTURAL METAL FRAMING. B. Gypsum backing board on multi-layer systems: Section 09 29 00, GYP

2、SUM BOARD. C. Application of sealants: Section 07 92 00, JOINT SEALANTS. D. Lead lined veneer base: Section 13 49 00, RADIATION PROTECTION 1.3 TERMINOLOGY A. Definitions and description of terms in accordance with ASTM C11, C843, C844, and as specified. B. Underside of Structure Overhead: Where stee

3、l trusses or bar joists are shown, the underside of structure overhead is the underside of the floor or roof construction supported by the trusses or bar joists. C. “Yoked“ Gypsum Board cut out for opening with no joint at the opening corners. 1.4 SUBMITTALS A. Submit in accordance with Section 01 3

4、3 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES. B. Manufacturers Literature and Data: 1. Gypsum veneer plaster. 2. Gypsum Base for Veneer Plaster. 3. Accessories. 4. Joint reinforcing materials. 5. Laminating adhesive. C. Shop Drawings: Typical veneer plaster installation, showing corner details, ca

5、sing details, control joint details, and other similar details. 1.5 APPLICABLE PUBLICATIONS A. Publications listed below form a part of this specification to the extent referenced. Publications are referenced in the text by the basic designation only. B. American Society for Testing and Materials (A

6、STM): C11-10 . Terminology Relating to Gypsum and Related Building Materials and Systems C472-99(R2009) . Physical Testing of Gypsum, Gypsum Plasters and Gypsum Concrete Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 09 26 00 - 2 C475-02(R2007

7、) . Joint Compound and Joint Tape for Finish Gypsum Board Construction C587-04(R2009) . Gypsum Veneer Plaster C1396-04 . Specification Gypsum Board C631-09 Bonding Compounds for Interior Plastering C843-99(R2006) . Application of Gypsum Veneer Plaster C844-04(R2010) . Application of Gypsum Base to R

8、eceive Gypsum Veneer Plaster C954-10 Steel Drill Screws for the Application of Gypsum Panel Products Board or Metal Plaster Bases to Steel Studs from 0.033 in. (0.84mm) to 0.112 in. (2.84mm) in thickness C1002-07 . Steel Drill Screws for the Applications of Gypsum Panel Products Board or Metal Plast

9、er Bases C1047-10 . Accessories for Gypsum Wallboard and Gypsum Veneer Base D3678-97(R2008) Rigid Poly (Vinyl Chloride) (PVC) Interior-Profile Extrusions SPEC WRITER NOTE: Make material requirements agree with applicable requirements specified in the referenced Applicable Publications. Update and sp

10、ecify only that which applies to the project. PART 2 - PRODUCTS 2.1 VENEER BASE ASTM C1396, plain, Type “X“, 16 mm (5/8-inch) thick. SPEC WRITER NOTE: Use 17.2 MPa (2500 psi) plaster for finish coat on projects where the veneer plaster finished walls/partitions are not protected with handrails and g

11、uardrails. 2.2 GYPSUM VENEER PLASTER ASTM C587. / Minimum compressive strength of finish coat plaster shall be 17.2 MPa (2500 psi) in accordance with ASTM C472./ 2.3 ACCESSORIES A. Corner Bead, Edge Trim and Control Joints: ASTM C1047 or D3678, except as specified. B. Corner bead and edge trim (casi

12、ngs): Minimum 0.38 mm (0.015-inch) thick zinc-coated steel sheet or rigid PVC plaster. C. Flanges not less than 22 mm (7/8-inch) wide with punch-outs or deformations as required to provide plaster bond. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,

13、-10-11 09 26 00 - 3 2.4 JOINT REINFORCING TAPE ASTM C475, Paper tape. 2.5 LAMINATING ADHESIVE ASTM C475 joint compound chemical setting type or as recommended by veneer base manufacturer. VOC not to exceed 20g/l; free of antifreeze and pesticides. 2.6 FASTENERS A. Screws: ASTM C1002 or C954. B. Stap

14、les: Flattened zinc-coated steel wire, minimum 15 mm (9/16-inch) leg for securing corner beads or casing and minimum 9 mm (3/8-inch) leg for securing joint reinforcement. 2.7 BONDING COMPOUND ASTM C631. PART 3 EXECUTION SPEC WRITER NOTE: 1. Read ASTM C840, C843, and C844; coordinate with project spe

15、cification and drawing requirements. 2. Extend finish to underside of structure overhead for fire partitions, smoke partitions, shafts, and sound rated partitions. Seal penetrations and edges for fire, smoke or acoustical requirements. 3. At new suspended ceilings, extend finish not less than 100 mm

16、 (4 inches) above suspended ceiling. 4. At existing ceilings, finish may terminate at ceiling except for conditions stated in NOTE 2. 5. Insure partitions are fully detailed for all requirements and types. Detail construction to conform to UL rated assemblies. Show location of control joints. 3.1 IN

17、STALLATION CRITERIA A. Where fire rated construction is required for walls, partitions, columns, beams and floor-ceiling assemblies, construct the same as that used in fire rating test. B. Requirements for fire rated and sound rated assemblies and materials: Construct as shown and specified; the pro

18、visions of the Scope Paragraphs 1.2 and 1.3 of ASTM C843 and 1.2, 1.3, and 1.4 of ASTM C844 regarding details of construction shall not apply. C. Requirements for ventilating unheated spaces above veneer plaster ceilings: Construct as shown and specified; the provisions of the Scope Paragraph 1.5 of

19、 ASTM C844 regarding ventilation shall not apply. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 09 26 00 - 4 3.2 APPLICATION OF VENEER BASE A. Gypsum Board Heights: 1. Extend gypsum board from floor to underside of structure overhead on parti

20、tions and furring as follows: a. Two sides of the following: SPEC WRITER NOTE: Delete “5. Corridor Partitions,“),“ from list, if buildings are fully sprinklered. 1) Fire rated partitions. 2) Smoke partitions including cross corridor smoke partitions. 3) Sound rated partitions. 4) Full height partiti

21、ons shown (FHP). 5) Corridor partitions. b. One side of the following: 1) Inside of exterior walls and furring. 2) Room side of rooms without suspended ceilings. 3) Furring for pipes and duct shafts, except where fire rated construction is shown. 2. Extend layers of gypsum board construction used fo

22、r fireproofing of columns from floor to underside of structure overhead, unless shown otherwise. 3. In locations other than those specified above, extend gypsum board as follows: a. Not less than 100 mm (four inches) above suspended acoustical ceilings. b. To ceiling of suspended gypsum board ceilin

23、gs. /c. To existing ceilings. / B. Installation: 1. Apply veneer base in accordance with ASTM C844, except as otherwise specified or shown. 2. Use veneer base of maximum practical length. 3. Install veneer base with long dimension direction as follows: a. On ceilings, at 90 degrees to framing to whi

24、ch it is applied. b. On partitions, horizontally or vertically, except when the partition is fire rated apply base as designed in the fire rating test. 4. In vertical application of veneer base, use panels of length required to reach full height of vertical surfaces in one continuous piece. 5. Erect

25、 veneer base so that the leading edge of the base is first attached to the open end of the metal stud flange. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 09 26 00 - 5 6. Leave a space approximately 6 mm (1/4-inch) at bottom and top of venee

26、r base for caulking or sealant. 7. Edge and End Joints: a. Locate edge joints over framing in fire rated partitions. b. Locate end joints over furring or framing in all cases. c. Stagger end joints of adjoining boards or multiple layer boards. SPEC WRITER NOTE: 1. Show and clearly define on drawings

27、 locations of control joints. 2. Detail control joints. 3. See ASTM C844 for design criteria. 8. Control Joints: a. ASTM C844, paragraph 7.4. b. Locate at both side of jambs of openings if gypsum board is not “yoked”. Use only one system throughout. c. Not required for wall length less than 9 m (30

28、feet). d. Do not extend veneer base across control joints. e. Extend control joints the full height of the wall or length of soffit/ceiling veneer plaster membrane. 9. Two-Ply Construction: a. Apply in accordance with ASTM C844 with joints between layers staggered or offset and falling over framing

29、member, except at control joints. b. Use screws to hold veneer base in place. 10. Accessories: a. Set plastering accessories plumb, level and true to line, neatly mitered at corners and intersections, and securely attach to supporting surfaces with screws or staples. b. Install in one piece, within

30、the limits of the longest commercially available lengths. c. Corner Beads: 1) At all external corners. 2) Where required as grounds. 3) Where shown. SPEC WRITER NOTE: Detail and show expansion and control joints. Maintain integrity of fire, smoke, and sound partitions. d. Casings Beads: 1) At both s

31、ides of expansion and control joints, except as otherwise shown. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 09 26 00 - 6 2) Where veneer plaster terminates against dissimilar materials and at perimeter of openings, except where covered by

32、flanges, casings or permanently built-in equipment. 3) Where non-load bearing veneer plastered surfaces abuts load bearing members. 4) Where shown. 3.3 SEALANT APPLICATION A. Apply sealants to veneer plaster base to cut outs, penetrations, and intersections with adjoining materials prior to applicat

33、ion of veneer plaster for acoustical partitions. B. Coordinate with Section 07 92 00, JOINT SEALANTS, for application of sealants. 3.4 VENEER PLASTER APPLICATION OVER GYPSUM BASE A. Mix and apply veneer plaster in accordance with ASTM C843 for one-component plasters, except as specified otherwise. B

34、. Joint Reinforcement: ASTM C843. C. Apply smooth-trowel finish. D. On fire rated, smoke barrier, sound barrier and other partitions specified or shown to extend to underside of structure overhead or full height (floor to floor), the veneer plaster finish may terminate 100 mm (four inches) above the

35、 suspended ceiling. E. Seal and reinforce all joints and fastener heads above ceilings. SPEC WRITER NOTE: 1. Add new paragraphs for direct applications on masonry or concrete if this occurs in project. 2. See ASTM C843 for Surface Preparation. 3. Coordinate and specify substrate requirements in appr

36、opriate sections. Require flush joints on new masonry work to receive veneer plaster. 3.5 CLEANUP AND PATCHING Remove any plaster splashes from adjacent surfaces. Repair defects in veneer plaster. Plaster surfaces shall be smooth, clean, and in condition to receive the finishing materials that will

37、be applied. 3.6 UNACCESSIBLE CEILINGS At Mental Health and Behavioral Nursing Units, areas accessible to patients and not continuously observable by staff (e.g., patient bedrooms, day rooms), ceilings should be a solid material such as veneer plaster. This will limit patient access. Access doors are

38、 needed to access electrical and mechanical equipment above the ceiling. These doors should be locked to prevent unauthorized access and secured to the ceiling using tamper resistant fasteners. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 09 26 00 - 7 - - - E N D - - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-