NYC 9/11 Public Portal Document
130 Cedar Street July 15, 2004
Selective Demolition and Facade Restoration Koenen Associates
C. Prevent mortar from staining face of surrounding masonry and other surfaces.
1. Cover sills, ledges, and projections to protect from mortar droppings.
2. Keep wall area wet below rebuilding and pointing work to discourage mortar from
adhering.
3. Immediately remove mortar in contact with exposed masonry and other surfaces.
4. Clean mortar splatters from scaffolding at end of each day.
3.2 UNUSED ANCHOR REMOVAL
A. Remove masonry anchors, brackets, wood nailers, and other extraneous items no
longer in use unless identified as historically significant or indicated to remain.
1. Remove items carefully to avoid spalling or cracking masonry.
2. If item cannot be removed without damaging surrounding masonry, cut off item
flush with surface and core drill surrounding masonry and item as close around
item as practical.
3. Patch holes where items were removed unless directed to remove and replace
units.
3.3 BRICK REMOVAL AND REPLACEMENT
A. See Section 04200 Unit Masonry
3.4 REANCHORING VENEERS
A. Install masonry repair anchors in horizontal mortar joints and according to
manufacturer's written instructions. Install at not more than 16 inches (400 mm) o.c.
vertically and 32 inches (800 mm) o.c. horizontally, unless otherwise indicated. Install
at locations to avoid penetrating flashing.
B. Recess anchors at least 5/8 inch (16 mm) from surface of mortar joint and fill recess
with pointing mortar.
3.5 REPLACING OR RESTORING SHELF ANGLES
A. Remove existing face brick and back up at shelf angle location. Salvage undamaged
face brick for reinstallation.
B. Remove all loose materials and backup from the void to expose the steel shelf angle
for the full length of the opening.
C. Clean all exposed surfaces of the the steel shelf angle. Remove all corrosion by-
products using power wire burshing techniques.
D. Clean the steel and the opening of all loose dust and debris with oil-free compressed
air.
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CLAY MASONRY RESTORATION AND CLEANING 04901 -9
NYC-WTC 000125176
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