Section 27-652
* § 27-652 Scope. The provisions of this subchapter shall establish
minimum requirements for the design and construction of the foundations
of buildings. In addition, within special flood hazard areas, and below
the regulatory flood datum, as described in article ten of subchapter
four of this chapter, foundations shall conform with the applicable
provisions of reference standard RS 4-5.
* NB There are 2 § 27-652's
Section 27-653
§ 27-653 Standards. The provisions of reference standard RS-11 shall
be part of this subchapter.
Section 27-654
§ 27-654 Definitions. For definitions to be used in the interpretation
of this subchapter, see subchapter two of this chapter.
Section 27-655
§ 27-655 Plans. For the requirements governing the filing of plans and
the work to be shown on the plans, see subchapter one of this chapter.
Section 27-656
§ 27-656 Permits. For the requirements governing equipment work
permits and for equipment use permits, see subchapter one of this
chapter.
Section 27-657
§ 27-657 General requirements. Except as otherwise specifically
provided herein, the foundations of buildings including retaining walls
and other structures shall bear on, or be carried down to, satisfactory
bearing materials in such manner that the entire transmitted load will
be distributed over the supporting soils at any depth beneath the
foundation at unit intensities within the allowable bearing values
established in this subchapter. In addition, foundations shall be
proportioned to limit settlements to a magnitude that will not cause
damage to the proposed construction or to existing adjacent or nearby
buildings during or after construction.
Section 27-658
§ 27-658 Depth of foundations. (a) Footings and Pile Caps. The bottom
surface of any footing, pier, pile cap, or other foundation
construction, other than grade beams, shall be carried down at least
four feet below the lowest level of the adjoining ground or pavement
surface that is exposed to frost, except as follows:
(1) In refrigerator, cold storage, or similar areas, the depth shall
be increased as required to found the construction below the potential
level of freezing in the soil, or loss of heat from the soil shall be
prevented by insulation, warm air ducts, circulating systems, or
equivalent means.
(2) For foundation elements resting on rock, the footings may rest on
the rock surface at shallower depths than those indicated above,
provided that visual inspection of the rock surface directly underlying
the bearing area shows it to be free of seams, cracks, or disintegrated
materials that could serve as reservoirs for water and thus be subject
to freezing.
(3) For foundation elements in the interior of closed and heated
buildings, or in cases where the soil underlying the foundation is not
subject to frost action, there shall be no mandatory minimum requirement
for embedment.
(4) Mobile or portable buildings not more than one story high may be
supported on foundation elements bearing at grade, subject to the
following conditions:
a. The building shall be supported on jacks, wedges, or other devices
that will permit readjustment of level in the event of displacement.
b. The bearing capacity of the underlying soil shall be adequate to
support the building loads without rupture. Where the building is to be
supported on nominally unsatisfactory bearing materials, the provisions
of sections 27-677 and 27-679 of article four of this subchapter shall
apply except that, where the bearing material is confined under pavement
and the bearing pressure on the surface of the soil material does not
exceed five hundred psf, special investigation of the foundation will
not be required.
c. The bearing area shall be well drained and not subject to
inundation.
d. The levels of the foundations shall be checked and adjusted to
compensate for displacements at least once every year, and the owner
shall maintain a record of such work, available for inspection by the
commissioner.
(5) Where piles project above grade and displacement of the pile cap
is prevented by interposing a space between the underside of the cap and
the ground, the requirement for embedment of the cap below the level of
frost penetration shall not apply.
(b) Grade beams. The bottom surface of any grade beam shall be carried
down at least eighteen inches below the lowest level of the adjoining
ground or pavement surface that is exposed to frost.
Section 27-659
§ 27-659 Foundations at different levels. Where footings are supported
at different levels, or at different levels from the footings of
adjacent structures, the influence of the pressures under the higher
footings on the stability of the lower footings shall be considered.
Consideration shall be given to the requirements for lateral support of
the material supporting the higher footings, the additional load imposed
on the lower footings, and assessment of the effects of dragdown on
adjacent pile-supported buildings.
Section 27-660
§ 27-660 Slabs on grade. Slabs on grade within or adjacent to a
building shall be so designed to limit settlement of such slabs to a
magnitude that will not impair their usability or cause damage to the
building or its foundations.
Section 27-661
§ 27-661 Construction. The provisions of subchapter nineteen of this
chapter relating to safety and of subchapter ten of this chapter
relating to concrete, timber, masonry, and steel construction shall
apply. For inspection requirements, see article thirteen of this
subchapter.
(a) Cold weather. No foundation shall be placed on frozen soil. No
foundation shall be placed in freezing weather unless provision is made
to maintain the underlying soil free of frost.
(b) Seepage. In an excavation where soil and ground water conditions
are such that an inward or upward seepage might be produced in soil
material intended to provide vertical or lateral support for foundation
elements or for adjacent foundations, excavating methods that will
control or prevent the inflow of ground water shall be employed to
prevent disturbance of the soil material in the excavation or beneath
existing buildings. No foundation shall be laid on soil that has been
disturbed by seepage unless remedial measures, as directed by an
architect or engineer, are taken.
To the extent possible under law, Friends of Devin Balkind for Public Advocate has waived all copyright and related or neighboring rights to New York City Administrative Code. This work is published from: United States.
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