Archive for August, 2010

House in Westchester County NY

August 21, 2010

Schematics above are for a new house with grandma suite on a 75′-wide, flat, wooded site in a shoreline community.

Wireframes by Salvador Behar Architects

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NYC ECC

August 13, 2010

Buildings Bulletin

Issuer: First Deputy Commissioner

Issuance Date: May XX, 2010

Purpose:  This document clarifies when an addition, alteration, renovation or repair to the building envelope may be exempt from the New York City Energy Conservation Code (NYCECC) pursuant to section NYCECC 101.4.4

Related Code Selections: NYCECC 101.4.4 Chapter 10

Subjects: Alteration: repair; roof replacement; exterior wall; curtain wall; wall exterior; wall curtain; wall masonry; wall frame; wall foundation; wall basement; door exterior; insulation; building envelope; envelope; energy code

New York City Energy Conservation Code (NYCECC) Section ECC 101.4.4 requires that additions, alterations, renovations or repairs (“work”) conform to the NYCECC unless they would “create an unsafe or hazardous condition or overload existing building systems” ….This bulletin establishes parameters for insulation in such alterations, renovations or repairs to reduce the likelihood of overloading the building envelope system.

In addition to the exceptions in Section ECC 101.4.4, the following types of work may not need to comply provided that energy use of the building is not increased:

1. Exterior Doors: Replacement of existing doors that separate conditioned space from the exterior shall not require the installation of a vestibule or revolving door, provided, however, that an existing vestibule that separates a conditioned space from the exterior shall not be removed.

2. Insulated Envelope: Work to insulated envelope elements shall be insulated to meet the requirements of NYCECC unless the requirement exceeds the thermal value of the existing envelope elements and the resulting increase in the thermal value of the element would cause freeze-thaw and water management problems to the envelope system. In such case, the requirements for un-insulated envelope elements in Item 3 below shall govern.

3. Uninsulated Envelope: The following work to the un-insulated envelope elements is clarified as follows:

A. Roofs

i. Flat roofs: If the scope of work on the roof affects less than 50% of a roof as bounded by a wall, parapet, rail or edge, or a minimum roof portion of 20,000 square feet, whichever is less, then insulation shall not be required.

ii. Sloped roofs: If the scope of work on the roof affects less than 50% of a roof plane as bounded by a ridge, wall, edge, parapet or rail, then insulation of that roof shall not be required.

B. Above-grade walls

i. Solid masonry wall: Unless an entire wall plane is being re-built insulation shall not be required.

ii. Cavity masonry wall: If the scope of work of the wall affects less than 50% of a wall plane, then insulation of such wall plane shall not be required.

iii. Framed wall: If the scope of work of the wall affects less than 50% of a wall plane, then insulation of such wall plane shall not be required.

iv. Curtain wall

a. If a vision panel is replaced within the system, then the thermal qualities of such vision panel shall meet the requirements of the NYCECC.

b. If the exterior glazing of a shadow-box panel is replaced, then the replacement exterior glazing may be treated in accordance with section ECC 101.4.4, exception 2.  If the shadow-box panel is replaced, the entire panel shall comply with the requirements of the NYCECC.

c. If a non-vision panel is replaced, it shall meet the requirements of the NYCECC.

C.  Below-grade wall as defined by Section 802.1.1.2 in the ECCCNYS, 2007

i. If the scope of work of the wall plane affects less than 50% of the wall plane, then insulation of such wall plane shall not be required.

D.   Slab-on-grade

i. Perimeter insulation shall be required where work is made to slab-on-grade.