Air sampling protocol document, 130 Cedar Street, Jan 2005

NYC 9/11 Public Portal Document

130 Cedar Street July 15,2004 Selective Demolition and Façade Restoration Koenen Associates

C. Stopping and Resuming Work: Rake back 1/2 brick length in each course; do not tooth. Clean exposed surfaces of set masonry wet units lightly (if required) and remove loose masonry units and mortar prior to laying fresh masonry. •

D. Built-In-Work

1. As the work progresses, build in items specified under this and other Sections of these specifications. Fill solidly with masonry around built-in items. in

2. Grout In door frames, access doors, louvers and other metal items embedded or built into masonry work solidly with grout.

3. Grout under lintels bearing plates, and steel bearing on masonry with solid bed of mortar.

4. Grout around sleeves, pipes, ducts and all other items which pass through masonry walls solidly with mortar, so as to be air tight and prevent air leakage. Refer to Section 07271 for packing of voids In rated masonry walls.

5. Fill vertical cells of masonry units solid with mortar or grout which have anchoring, reinforcing rods, supporting of hanging devices embedded In the cell including all required anchors.

6. Fill vertical cells of masonry units solid with mortar on each side of door frames to sixteen (16) inches beyond.

7. Unless otherwise noted, fill vertical cells of masonry units solid with mortar which are below steel bearing plates, steel beams, and ends of lintels, to eight (8) Inches beyond bearing and from floor to bearing.

8. Place wire mesh in horizontal joint below masonry unit cells to be filled with mortar, to prevent mortar from dropping into unfilled cells.

9. Any masonry indicated as being reinforced shall have all voids filled solid with grout. Grout shall be consolidated in place by vibration or other methods which insure complete filling of cells. When the least clear dimension of the grouted cell is less than two (2) inches, the maximum height of grout pour shall not exceed twelve (12) inches. When the least clear dimension is two (2) inches or more, maximum height of grout pour shall not exceed forty-eight (48) inches. When grouting is stopped for one (1) hour or longer, the grout pour shall be stopped 1- 1/2" below the top of a masonry unit. Vertical bar reinforcing shall be accurately placed and held in position while being grouted, and shall be In place before grouting starts. All such reinforcing shall have a minimum clear cover of 5/8". Lap all bars a minimum of forty (40) bar diameters and provide steel spacer ties (not to exceed 192 bar diameter) to secure and position all vertical steel and prevent displacement during grouting. Provide continuous horizontal reinforcement embedded In mortar joints every second course.

E. Cutting and Patching

1. All exposed masonry which requires cutting or fitting shall be cut accurately to size with motorized carborundum or diamond saw, producing cut edges.

2. Do not saw cut any masonry openings in face brick construction without Architect's approval and after a procedure has been reviewed and approved.

Unit Masonry 04200-7

NYC-WTC 000125164