1. Site Layout and Design.
A. Streets. Streets shall be designed so that the buildings in the subdivision or land development shall be oriented with their long axis within 20 degrees of a true east-west orientation. Solebury Township may permit a proportion of the streets to diverge from this requirement if the geography and site demands such. (Also refer to Chapter 22, Part 5, of the Solebury Township Code relating to Design Standards.)
B. Lot Design. The lot design shall provide for lots of adequate width, depth, and shape for solar energy orientation, to provide open area, to eliminate overcrowding, and to be appropriate for the location of the subdivision or land development and for the type of development contemplated. Lots and building setback lines shall be designed so that the buildings in the subdivision or land development can be oriented with their long axes within 20° of a true east-west orientation. In subdivisions or land developments of more than five buildings, a minimum of 80% of the proposed buildings must be oriented as required by this subsection.
C. LEED for Neighborhood Development (LEED-ND) design and certification shall be encouraged.
2. Building Placement and Design.
A. Buildings shall be placed on an axis within 20° of a true east-west with the longest wall facing southward to benefit from solar energy, natural shading, natural lighting, and thus reduce energy requirements. In subdivisions or land developments of more than five buildings, a minimum of 80% of the proposed buildings must be oriented as required by Subsection 1. Group of connected townhomes is to be considered one building for the purposes of this rule.
B. Buildings shall be placed within the topography such that walkout basements (where used) are positioned so that the exposed or walkout part of the basement is on the southward facing side of the building.
C. Lots shall be laid out to permit buildings to employ renewable energy sources such as closed-loop geothermal energy, wind energy, or solar energy in the mechanical heating and cooling of any building, at the time of construction or in the future.
D. No structure, whether principal use or accessory use; and no coniferous plant materials, whether trees, shrubs, or other; and no permanently fixed equipment, shall be of such a height that it would cast a shadow during daylight between 9:00 AM and 3:00 PM of the winter solstice (the shortest day of the year) on any solar gathering component of an existing or proposed solar energy system.
E. LEED building design and certification shall be encouraged.
3. Shading.
A. Buildings shall be built incorporating an overhang, awning, deciduous trees, or other methodology that casts a shadow on all fenestration on the southward exposure of the building during daylight between 9:00 AM and 5:00 PM (daylight savings time) of the summer solstice (the longest day of the year).
4. Landscaping.
A. All required landscaping, street trees, and buffers shall be provided in accordance with the regulations for the zoning district in which the project is located and in accordance with the Chapter 22, Subdivision and Land Development, as applicable.
B. Prevailing winds are to be identified and landscaping shall be positioned to provide a windbreak for any occupied building.
C. Street trees shall be placed considering solar access and shading.
D. Coniferous trees shall be placed on the north side of a structure to provide a windbreak in the winter and deciduous trees may be placed on the south side of structures to provide shading in the summer and solar energy access in the winter. If evergreen trees are placed on the north side of a structure to provide a windbreak, they may count toward required street or shade trees.
E. All landscape berms shall be encouraged on the north side of any occupied building upon a lot.
F. At least 80% of the required plants shall be native.
5. Cool/Green Roofs.
A. The use of green roofs and cool roofs on nonresidential, flat, or slightly sloped, (0-30° pitch) roofed buildings, and structures, is encouraged to supplement measures to reduce energy consumption, reduce heat island effects, and provide other environmental benefits such as a reduction in stormwater runoff.
B. Cool roofs shall have a Solar Reflectance Index of 50 or greater in accordance with the Cool Roof Rating Council and ANSI/CRRC S100 (2016), Standard Test Methods for Determining Radiative Properties of Materials.
C. Green roofs shall include vegetation on at least 50% of the roof area of all buildings in the project and shall use only drought-tolerant landscaping. Green roofs shall be installed in accordance with ANSI standards for fire, wind uplift, and root repellency (ANSI/SPRI VF-1, ANSI/SPRI RP-14 and ANSI/SPRI VR-1.) See Subsection 6 for available bonus provisions.
6. Green Walls/Living Walls.
A. The use of green walls, interior or exterior, is encouraged to supplement measures to reduce energy consumption, heat island effects and provide other environmental benefits such as improved air quality.
B. Green walls may be modular or soilless types.
7. Thermal Mass Walls.
A. The use of thermal mass walls is encouraged to supplement measures to reduce energy consumption in combination with renewable energy sources and other passive energy reduction strategies as outlined in this Part.
B. In accordance with the 2018 Pennsylvania Alternative Residential Energy Provisions, as published by the Pennsylvania Housing Research Center, and the Pennsylvania Energy Code, thermal mass walls must have an R value of 8 or an R value of 13, when more than half the insulation is on the interior.