Dust producing operations shall be wetted down to the extent necessary to control the dust.
Provision shall be made to prevent the accumulation of water or water damage to any foundations on the premises or to the adjoining property.
When existing sprinkler systems with siamese hose connections are present in structures undergoing full or partial demolition, such systems shall be maintained as a non-automatic sprinkler system, except as provided in Section 3306.9.6.1. When demolition starts, the sprinkler risers shall be capped immediately below the floor being demolished so as to maintain the sprinkler system on all lower floors for Fire Department use. Cutting and capping of sprinklers during demolition work shall be performed only by a licensed master plumber or licensed master fire suppression piping contractor who has obtained a permit for such work. Siamese hose connections shall be kept free from obstruction and shall be marked by a metal sign reading "Sprinkler Siamese Connection" and by a red light at night. The red paint required pursuant to Section 903.6 of this code shall be maintained during any demolition operations.
Requests for a variance from the sprinkler requirements of this section shall be limited to requests to remove a damaged or inoperable sprinkler system or a portion of such system in connection with demolitions or gut rehabilitations. Applications for construction document approvals for such requests shall be filed with the department by a registered design professional in accordance with the following procedure:
- The filed application shall include a complete report prepared by the professional describing the extent of the damage and attesting as to why the system cannot be restored; and
- The variance shall not be approved by the department without the concurrence of the Fire Department as follows:
- The applicant shall file the request for variance with the Fire Department;
- The Fire Department shall review and recommend any necessary safety measures required as a condition of granting the variance; and
- The applicant shall submit the Fire Department's recommendation to the department along with proof of satisfactory implementation of such safety measures.
Hazards shall be removed in accordance with the following requirements:
- Before commencement of actual demolition, all glass in windows, doors, skylights, and fixtures shall be removed.
- In any structure more than 25 feet high (7620 mm), any window or other exterior wall opening that is within 20 feet (6096 mm) of a floor opening used for the passage of debris from floors above shall be solidly boarded up or otherwise substantially covered, unless such window or opening is so located as to preclude the possibility of any person being injured by material that may fall from such window or opening.
- Before demolition is started, the cellar and all floors shall be thoroughly cleaned of combustible materials and debris. All fixtures and equipment that would cause voids in the fill shall be removed. If the cellar is to be filled to grade, the first floor construction shall be removed and the existing cellar floor shall be broken up to the extent necessary to provide ground drainage and prevent accumulation of water. If the cellar is not to be filled, positive cellar drainage shall be provided.
- All asbestos shall be removed and certifications to that effect shall be filed with the department and the Department of Environmental Protection.
- Demolition of walls and partitions shall proceed in a systematic manner, and all work above each tier of floor beams shall be completed before any of the supporting structural members are disturbed.
- Sections of masonry walls shall not be loosened or permitted to fall in such masses as to affect the carrying capacity of floors or the stability of structural supports.
- No wall, chimney, or other structural part shall be left in such condition that it may collapse or be toppled by wind, vibration or any other cause.
- No section of wall with a height more than 22 times its thickness shall be permitted to stand without bracing designed by a registered design professional.
- Where brick or masonry chimneys cannot be safely toppled or dropped, all materials shall be dropped down on the inside of such chimneys.
- All enclosed vertical shafts and stairs shall be maintained enclosed at all floors except the uppermost floor being demolished, and all work on the uppermost floor shall be completed before stair and shaft enclosures on the floor below are disturbed. All hand rails and banisters shall be left in place until actual demolition of such floor is in progress.
No bearing partition shall be removed from any floor until the floor framing system on the floor above has been removed and lowered. All header beams and headers at stair openings and chimneys shall be carefully examined, and where required shall be shored from the cellar floor through successive floors. All operations shall be continually inspected as the work progresses to detect any hazards that may develop.
Material shall not be stored on catch platforms, working platforms, floors, or stairways of any structure, except that any one floor of a building to be demolished may be used for the temporary storage of material when such floor can be evaluated by an engineer and proven to be of adequate strength to support one and one-half times the load to be superimposed. Such evaluation by the engineer shall be maintained by the permit holder and made available to the department upon request.
Storage spaces shall not interfere with access to any stairway or passageway, and suitable barricades shall be provided so as to prevent material from sliding or rebounding into any space accessible to the public. All material shall be safely piled in such storage locations in a manner that will not overload any part of the structure or create any hazard.
Before any material is stored on any floor, the existing flooring adjacent to bearing walls, shear walls, beams and columns shall be removed and the connections of the floor framing system to the bearing walls, shear walls, beams and columns shall be carefully examined by a competent person to ascertain their condition and adequacy to support such material. If the connections are found to be in poor condition or inadequate to support the stored material, no material shall be deposited on the floor until these connections are shored from the cellar floor through each successive floor or otherwise strengthened to safely support such material.
In buildings of noncombustible construction, floor slabs to an elevation of not more than 25 feet (7620 mm) above the legally established curb level may be removed to provide temporary storage for debris, provided that:
- The stored debris is piled with sufficient uniformity to prevent lateral displacement of interior walls or columns as determined by a registered design professional.
- The height of the piled material will not burst the exterior walls due to horizontal loading as determined by a registered design professional.
- The operation does not otherwise endanger the stability of the structure.
Debris stored in the cellar shall not be piled above the level of the adjacent exterior grade unless the contractor provides sheet-piling, shoring, bracing, or such other means necessary to insure the stability of the walls and to prevent any wall from collapsing due to horizontal loading created by the debris as determined by a registered design professional.
Debris, bricks, and similar material shall be removed through openings in the floors of the structure, or by means of chutes, buckets, or hoists that comply with the provisions of this chapter. Openings in any floor shall not aggregate more than 25 percent of the area of that floor unless it can be shown by submission from a registered design professional to the satisfaction of the commissioner that larger openings will not impair the stability of the structure.
Every opening used for the removal of debris in every floor, except the top or working floor, shall be provided with a tight enclosure from floor to floor, equivalent to that afforded by planking not less than 2 inches (51 mm) in thickness. As an alternative, in buildings not more than 6 stories in height, such openings may be protected by a tight temporary covering equivalent to that afforded by planks not less than 2 inches (51 mm) in thickness and laid close. Wherever such covering has been temporarily removed to permit debris removal, floor openings shall be protected by standard guardrails that meet the requirements of Section 3307.8. Such covering shall be promptly replaced in position upon the ceasing of such work at the end of each workday.
Every opening not used for the removal of debris in any floor shall be solidly planked over.