09200.DOC

SECTION 09200

PART 1

GENERAL

A. Scope: Provide all labor and materials for a complete installation in locations shown on the drawings.

B. Related Sections

1) Section 03300 – Concrete

2) Section 04200 – Unit Masonry

3) Section 09250 – Gypsum Wallboard

4) Section 09900 – Painting

C. Quality: Materials, mixing, and workmanship shall be in accordance with ASA standard specifications and UBC, Chapter 47.

D. Reference Standards

1) 2006 Uniform Building Code.

2) Portland Cement Association Stucco Manual

3) 2006 UBC Standard 21-11 Masonry Cement

4) 2006 UBC Standard 19-1 Portland Cement

5) ASTM C206 – Finishing Hydrated Lime

6) ASTM C897 – Aggregates for Job Mixed Portland Cement Based Plaster.

7) ASTM C926 – Application of Portland Cement Based Plaster.

8) ASTM C932 – Surface Applied Bonding Agents for Exterior Plastering.

E. Sample Panel

1) Size 4’ x 8’

2) Construct panel using subbase, base, lathing and furring, accessories, plaster coats, color and finish texture representative of that required on the project.

3) Panel will be reviewed for proper construction, color texture, and workmanship.

4) do not proceed with work until sample panel is reviewed and approved by the Owner.

5) maintain sample panel on site for duration of project for comparison purposes.

F. Jobsite Conditions

1) Do not apply stucco when ambient temperature is below 40 degrees F.

2) Protection: Protect adjacent finished surfaces, installed prior to stuccoing, by covering with plastic sheets, non-staining Kraft paper, removable type masking tape or other appropriate means.

PART 2

PRODUCTS

A.

Accessories: Galvanized trim as recommended by manufacturer and as follows:

(1) #15 expansion joint

(2) Weep screed

(3) #66 square edge casing bead

(4) #1-D expanded corner bead

(5) Extruded aluminum ¾” x ¾”. “F” molding – Fry Reglet or equal

(6) Extruded aluminum. Reveal molding ¾” x 2”. Fry Reglet PCS-75-200 or equal.

B. Portland Cement: ASTM C150, Type 1 or 11 low alkali

C. Hydrated Lime: ASTM C206 Type S.

D. Sand: Base Coats: ASTM C897, Clean, well graded, free from soluble salts and organic matter. Finish coat: Natural or manufactured sand graded to pass the No. 16 mesh sieve, light colored.

E. Water: Clean, fresh, free from alkali and impurities.

F. Self Furring, Paper-Backed Metal Lath: “K” lath or equal, “Gunlath” on soffits.

G. Vapor Barrier: Asphalt impregnated, Kraft Grade D paper conforming to UBC Standard 14-1.

PART 3

EXECUTION

A. Examination

(1) Verify that bases to receive plaster conform to the requirements of ASTM C926.

(2) Verify that areas and conditions under which work is to be performed permit proper and timely completion of the work.

B. Application

(1) Install one layer of Vapor barrier over substrate, attach through gypsum sheathing into metal studs. Do not attach only to sheathing.

(2) Install paper backed wire lather over vapor barrier, attach through vapor barrier and gypsum sheathing into metal studs. Do not attach only to sheathing.

(3) Apply individual coats of cement plaster using machine application to achieve the required thickness.

(4) Apply cement plaster with interruptions occurring only at junctures of plaster planes, at openings, or control joints.

(5) Apply 3/8” scratch coat, brown coat as required, 1/8” final coat. Three coats, total thickness 7/8”.

(6) Material proportions of each coat shall be in accordance with U.B.C. Table 47-F and ASTM C 926.

(7) Final coat applied per Portland Cement Assoc. “Plasterer’s Manual.”

C. Curing

(1) When ambient relative humidity will be below 75% during non-work hours, moist cure the set and hardened basecoat at the end of the workday by spraying a fine mist of water over the entire surface. Repeat application of a fine mist of water morning and evening until plaster has be in place 48 hours. Alternatively, coverage of the basecoat with plastic membrane until application of subsequent coat or finish coat is permitted.

D. Finish

(1) Walls/Soffits: Uniform fine sand float texture.

E. Accessories

(1) Install weep screed at base of all walls.

(2) Install corner bead at all outside corners.

(3) Install expansion joints at all locations shown on the drawings.

(4) Install “F” reveal molding where shown on the drawings.

(5) Install reveal moldings at all locations shown on the drawings.

(6) Install square edge casing bead at all intersections with dissimilar materials.

F. Final Clean-up

(1) Point-up plaster around trim and other locations where plaster abuts dissimilar materials.

(2) Remove defective and damaged plaster by cutting it out. Replace removed plaster using plaster with same composition and brought to desired texture and color consistent with surrounding area.

(3) Remove protective materials masking adjacent surfaces.

(4) Remove stains that affect uniformity of plaster finish.

END OF SECTION

09200 - 1 H:\8348\8348003.23\Docs\B-3 Specs\Division 9\09200.DOC November 1, 2005