Team 7471
Project Narrative
LEED score: Platinum + 18 points
(EA 25.5)
Cost: $100,832
865sf
Our design is an adaptation of the classic New Orleans shotgun, a time honored, contextually sensitive and ultimately flexible building type. By echoing the simple gabled roof, generous front porch and window pattern of the typical 3-bay New Orleans shotgun house our home complements the historic character of the Broadmoor neighborhood.
The organization of the plan, like that of most shotguns, is that of a long bar building that alternates between open and flexible living spaces and service cores containing bathrooms, closets and utility spaces. Because of the narrow lot and requirements for a highly efficient floor plan, we organized our home to eliminate interior circulation space while offering the future residents flexibility in how they use their home.
We anticipated that an elderly couple would use the master suite as their bedroom, and that the second bedroom could function as either a guestroom, a den or as a suite for a home health aide. By removing certain non structural walls that contain the closets shown in the front of the house, the residents can open the front room to be part of a continuous open living area, and, if later they prefer a second bedroom, the modification to enclose it is simple and inexpensive. Our plan includes the clear floor areas and widths required by ANSI A117.1 in all areas with the exception of the half bathroom.
Our approach to the exterior of the home integrates universal design, a response to local climate, an integrated landscape and storm water design and strategies for hurricane protection. We took the requirement for an ADA ramp as an opportunity to enhance the function of the building. By wrapping the home with the ramp we are able to create a system of exterior porches covered by deep eaves and bounded by sunscreens and integrated planters. The deep eaves shade the home from the sun while protecting the homeowner from rain. The structure that bounds the ramp can serve many functions, including accessible planting beds, integrated hand and guardrails, a trellis for climbing plants and a second skin that protects the building from debris in the event of a hurricane. Also, the slope and location of the ramp allows us to create an integrated gravity-fed rainwater collection and irrigation system that decreases water use and limits our impact on the municipal storm water system.
Our construction system uses Structural Insulated Panels for the exterior walls and roof, which provide many advantages in terms of energy efficiency, limited construction waste and speed of construction. Because SIPs are pre-fabricated, we anticipate that using this material will provide bigger savings in the future if used for the construction of multiple houses.
Preliminary Specifications for LEED and Cost considerations
Team 7471
Division 1 General Requirements
? 01700 Execution Requirements
Temporary erosion control measures to be taken during construction.
Contractor to draft and post a Waste Reduction Plan including lists of materials that can be recycled or reused and the contact information for local salvage and recycling companies. The rate of diversion for construction waste to be recorded and meet or exceed 25%.
? 01800 Facility Operation:
Create an Operations and Maintenance manual containing all operating instructions for equipment and systems, and deliver to residents.
Host an open house and tour of the completed home for the community and highlight the green building and energy efficiency features
Division 2 Site Construction
? 02400 Boring
Drive (34) 6” diameter wood piles, 35’ in length
? 02450 Foundation and Load-Bearing Elements
Reinforced concrete grade beam, 26” width, 16” depth, 30% flyash (148lf)
? 02600 Drainage and Containment
Rainwater collections system to include rain barrels fed by roof gutters, and located to be used for irrigation in front and backyard as well as gravity fed system for irrigation of integrated planter system. (5) 50 gallon barrels.
Raingardens at front and backyards.
? 02800 Site Improvements and Amenities
Curbcut for ADA ramp from right-of-way
Paved walkway from sidewalk to house suitable for ADA access (40sf)
Exterior decks and porches constructed of recycled plastic timber (430sf)
Exterior ADA ramps constructed of recycled plastic timber (295sf)
Concrete planter with integrated irrigation system, use 30% minimum fly ash (70lf).
Recycled (salvaged from site if possible) concrete pavers in back patio.
Raised beds for vegetable gardening at planting strip in right-of-way
? 02900 Planting
Per site/landscape plan, primarily native plantings.
All species to be well-adapted to New Orleans environment and require minimal watering after establishment.
No turf, select low-maintenance ground covers for side yard.
Climbing vines (star jasmine or similar) at trellis along West ramp.
Division 3 Concrete
? 03200 Concrete Reinforcement
? 03300 Cast-In-Place Concrete
As above under foundations and site amenities, use local aggregate and cement (produced within 500 miles of job site) and minimum 30% flyash.
Division 4 Masonry
? 04081 - Masonry Anchorage
Simpson Strong-Tie or similar hurricane straps at cmu piers
? 04200 Masonry Units
34 reinforced cmu piers, each containing 8 alternating double courses (544cmus)
Division 5 Metals
Division 6 Wood and Plastics
? 06090 - Wood and Plastic Fastenings
Simpson Strong-tie or similar hurricane straps per engineer
? 06100 Rough Carpentry
If tropical wood is used, builder prefers FSC certified wood and requests country of origin documentation.
Detailed framing plan and lumber cut list to be prepared per drawings
All floor framing to be 2x_ lumber, precut framing package (865sf)
Interior framing 2x_lumber, flat-framed where indicated in plan (80 lf)
All sills to be treated lumber
? 06120 Structural Panels
Exterior walls to be 4-1/2” SIP (R=16.6)
Roof to be 6-1//2” SIP (R=32.9)
? 06500 Structural Plastics
Recycled plastic lumber or thermoplastic timber for all exterior decks
Division 7 Thermal and Moisture Protection
? 07100 Damproofing and Waterproofing
Self-healing waterproof membrane at joints, thru bolts and at roof ridge.
Fill all gaps in SIPs with foam sealant
? 07200 Thermal Protection
R-21 Batt insulation pinned between floor joists, 35% minimum recycled content
? 07300 Shingles, Roof Tiles, and Roof Coverings
Standing seam metal roof, light colored (high albedo), 25% minimum post-consumer, or 50% minimum post-industrial, recycled content
? 07400 Siding Panels
HardiePlank 6” exposure fiber cement board siding, minimum 50% postindustrial recycled content.
? 07900 Joint Sealers
Seal joints to meet performance requirement of LEED EAc3.2 max 3.0 ACH50
Division 8 Doors and Windows
? 08200 Wood doors
All glazed exterior doors to meet or exceed LEED Homes EAc 4.3: U-factor <0.55, SHGC <0.30
? 08300 Specialty Doors
Verify minimum 32” clear opening on all interior and exterior doors.
? 08500 Windows
All windows to meet or exceed LEED Homes EAc 4.3: U-factor <0.55, SHGC <0.30 and hurricane ratings.
? 08700 Hardware
Install hardware designed for ease of use by the elderly and those with limited hand strength for all doors and minimum one operable window per room. The force required to operate hardware shall not exceed 5 pounds.
Division 9 Finishes
? 09200 Plaster and Gypsum Board
Gypsum wallboard throughout interior
Hardie Backer at bathroom walls
? 09300 Tile
12x12 ceramic tile in bathrooms
? 09600 Flooring
Engineered Bamboo flooring throughout
? 09900 Paints and Coatings
Low VOC paint throughout to conform to Green Seal Standard GS-11
Division 10 Specialties
? 10290 Pest Control
Install metal termite guard at the top of each foundation pier and corrosion-proof screen at all openings.
Fill all voids in foundation piers
Treat all wood members within 3’ of grade with borate
Seal all cracks, joints and penetrations with caulk
Division 11 Equipment
? 11450 Residential Equipment
Refrigerator to be Energy Star labeled
Dishwasher to use 6 gallons or less per cycle
Clothes washer to be Energy Star labeled , MEF>2 and WF<5.5
Division 12 Furnishings
Division 13 Special Construction
Division 14 Conveying Systems
Division 15 Mechanical
? 15100 Building Service Piping
Insulate hot water lines to R-4 minimum
? 15400 Plumbing Fixtures and Equipment
Water heater to be Energy Star labeled, no branch line from the water heater to exceed 20’, insulate all hot water pipes to R-4
Storage or tankless hot water heater EF>0.80.
Flow rate for sinks < 2.0 gpm
Flow rate for showers < 2.0 gpm
Flow rate for toilets < 1.3 gpf
? 15700 Heating, Ventilating, and Air Conditioning Equipment
Install Carbon Monoxide sensor.
Package system to meet minimum 16 SEER, 9 HSPF.
Size per ASHRAE 2001 for 10,000 cubic feet conditioned space.
Locate air-handling unit within the conditioned space.
Only non HCFC refrigerant.
? 15800 Air Distribution
Locate all ducts within the conditioned space.
Continuously operating whole house ventilation system with minimum 45 cfm capacity per ASHRAW 62.2.
Install >MERV 13 filters
? 15900 HVAC Instrumentation and Controls
Install Energy Star labeled programmable thermostat
Install HVAC system with additional controls to operate in dehumidification mode.
Bathroom fan to be equipped with automatic timer.
? 15950 Testing, Adjusting, and Balancing
Green Rater inspection required for batt insulation and SIP installation using the Energy Star Qualified Homes Thermal Bypass Inspection Checklist
Complete all requirements of the Energy Star Indoor Air Package
Third party testing of ventilation rates per ASHRAE 62.2
Division 16 Electrical
? 16500 Lighting
All lighting controls, switches and environmental controls to be placed within the reach ranges or 42” AFF typical except above vanity and kitchen counters.
All lighting fixtures to be Energy Star labeled
All ceiling fans to be Energy Star labeled
