specs

Section 09220
Page 5
7. Do plastering in brightly lighted areas to provide the maximum of visibility in order to obtain even,
smooth finishes.
8. Cut out openings with each coat of plaster while plaster is dry.
9. Check grounds, screeds, corner beads and other accessory items and anchors for rigidity before applying
plaster.
10. Apply plaster in accordance with ASTM C 926, PCA Plaster Manual, and manufacturer’s instructions.
Utilize most stringent requirements if conflicts exit.
11. Apply plaster by machine or hand. Interrupt plaster only at junctions of plaster planes, at openings, or at
control joints.
12. Layout to permit completion of an entire surface in one application. Maintain a wet edge. Work to
corners and joints, and do not allow material to set up within a distinct wall area.
13. Interrupt plaster at control joints. Tool through second and finish coat to produce “V” joint at intersection
of frames and other items of metal or wood which act as plaster grounds.
B. Cement Plaster and Stucco Application:
1. Scratch Coat - Apply with sufficient material (min. thk. 3/8 in.) and pressure to form full keys with metal
lath, cover well, cross scratch after setting. Cure and dry a minimum of 7 days before applying brown
coat. Keep scratch coat moist for a minimum period of 48 hours after application.
2. Brown Coat - Apply to a minimum thickness of 1/4" in two applications and bring to a true, even plane by
rodding and floating. Leave rough to receive finish coat. Dampen scratch coat to provide suction before
applying brown coat. Leave brown coat to dry a minimum of 7 days.
3. Finish Coat - Apply Thorowall finish over plaster with smooth clean stainless steel trowel using sufficient
manpower and equipment to insure a continuous operation without cold joints, scaffolding lines, etc.
3.04 PATCHING
A. Plaster with cracks, blisters, pits, checks or discoloration will not be acceptable.
B. Such plaster shall be removed and replaced with plaster conforming to this Specification.
C. Point around tile, steel, iron, fixtures, outlet boxes, switch plates, and other items abutting or extending into
plaster.
D. Upon completion give plaster work a final inspection and repair defects, cracks, and damaged spots.
E. Patch defects in workmanship and materials. Patches in finished areas shall match adjacent surfaces.
F. Existing Plaster Repair:
1. Ensure existing substrate is sound.
2. Remove plaster adjacent to repair area that is cracking, chipping, and spalling off, then remove old paint
from adjacent area.
3. Scarify adjacent old plaster area and apply bonding agent to prevent old plaster from extracting water from
the new plaster before it cures.
4. Patch holes with new plaster and blen the finish coat with adjacent scarified areas.
G. Adjusting:
1. Upon completion, point-up plaster around trim and other locations where plaster meets dissimilar
materials.
2. Apply fog coat to integral color plaster to ensure uniform color.
3. Cut out and patch defective or damaged plaster. Cut out and patch stained or discolored finish plaster.
4. Match patch of defective or damaged plaster to existing work in form, texture, and color.
5. Obtain Architect’s acceptance of plaster color and texture prior to scaffold removal.
3.05 CLEAN-UP AND PROTECTION
A. Refer to Section 01710-Cleaning.
B. Clean aluminum surfaces at the end of each days work since plaster stains and discolors aluminum.
C. Protect finished work.
D. Upon completion of the work, excess materials and debris shall be removed from the premises.
3.06 GUARANTEE
A. Upon completion and acceptance of the project, furnish to the Owner through the Architect a written guarantee.
B. Guarantee items and work included in the Section for a period five years from the date of acceptance against
defective workmanship and/or materials.
NAPA CENTURY CENTER XD 12
#165582