Green Housing for ALL- Habitat program 9-18-2017Green Housing for ALL Design Competition(modified from Pioneer Valley Habitat for Humanity standard program)Design Guidelines# unitsBedroomsMin. SizeMax. SizeBathroomsZero Lot LineHeatFoundationOneOne500
sq. ft.800 sq. ft.One fullYesAir-source heat pumpSlab on gradeOneTwo650 sq. ft.900 sq. ft.One fullYesAir-source heat pumpSlab on gradeOneThree800 sq. ft.1,000 sq. ft.One & ½NoAir-source
heat pumpSlab on grade
Zero lot line should not use common wall (i.e., use two independent walls)
Box is best
Covered main entryway with simple roof, no enclosed porchNet Zero Energy with photovoltaic arrays, Energy Star and Energy Stretch Code requirementsEPA radon & ASHRAE 62.2 ventilation
guidelines- passive radon mitigation system stone under slab through roofSimple, volunteer friendly designs with proven technology, minimize need for professional helpLow homeowner life-cycle
cost for homeownerInclude attached shed for unconditioned storage, no garage and no basementDesign home to be visitable by someone in a wheelchairLimit homeowner options - not a custom
houseWalls Single 2x6 bottom plate, double 2x6 top plate on exterior walls2x6 exterior walls, 16” or 24” on center studs at standard stud length7/16” OSB sheathingInsulated headers as
shown on plans.2x4interior partition studs at 16” on center unless shown otherwise on plans.FloorsMinimum 2” XPS rigid foam installed around the perimeter inside the foundation and under
the slab and at least six inches of 1 ½” stone under the rigid foam.Pressure-treated or otherwise rot-resistant 2x6 sill plate above foundation. Sill sealer installed below rim joist
and between sill plate and foundation.Engineered 2x10 floor joists, sizes, spacing etc. to be determined by manufacturer.¾” T&G ‘Advantech’ or equivalent subfloor sheathing (first and
second floors only, no sheathing in attic)RoofPrefabricatedroof trusses, installed according to manufacturer’s specifications.5/8" plywood sheathing. (Zip System or equivalent water
resistant sheathing and taping may be used if temporary water resistance is needed before shingles can be installed.)Siding, Trim - Windows, Doors, Corner boards, Fascia, Sub-Fascia,
Frieze Boards, Band Boards, Soffits etc.Pre-finished fiber cement clapboard and/or large format panels or equally low cost low labor siding.All siding installed over integrated rain
screen/air sealing system (sheathing seams sealed with zip tape, 2”rigid foam XPS installed over sheathing and sealed with Dow or equivalent tape).If siding is fiber cement, use primed
pine trim (rabbet the trim to form a channel, prime and paint)Vinyl soffits, perforated at eaves for air flowSimple horizontal eave/soffit returnsOne coat primer and two coats finish
on all non-vinyl exterior trimWindows and Exterior DoorsWindows and doors to meet or exceed current Energy Star and Stretch Code performance standards. All doors and windows to be installed
to wooden framing members. Gaps to be sealed with expanding foam and/or mineral wool, with weatherstripping applied where appropriate.Doors to conditioned space to be insulated fiberglass
with low-E insulated glass panel(s). Doors to unconditioned space (e.g. bulkheads, exterior sheds) to be fiberglass or metal.Locksets and deadbolts provided by Yale(or current gifts-in-kind
partner) through HFHI.Exterior doors are factory primed and will receive two coats of acrylic latex (semi-gloss or similar finish).RoofingThirty year architectural shingles (in solar
reflective colors, where possible), on top of underlaymentContinuous ridge vent36” bituminous membrane waterproofing above exterior plane on all eave edgesMinimum 5 ½” heavy gauge drip
edge on all roof edgesPorches and DecksStair treads and decking to be 5/4” x 6” composite. Framing will be pressure-treated. All porch and stair posts to be 4x4 PT.Porch and stair railings
to feature 2x4 base rails and 1” balusters. Porch roof construction varies but prefer simple shed or gable roof – see plans for details.LandscapingInstallation of driveway in accordance
with site plan, typically to consist of 9” gravel base and 3” of trap rock gravel or reprocessed aggregate as top coat.Front walkway to be constructed with a 6” gravel base and finish
material similar to the driveway surface.Compacted soils to be tilled to 6”. Topsoil to be spread over disturbed areas and raked to remove debris to a minimum depth of 4”. Yard to be
seeded with drought-resistant weed-free grass seed.No turf in densely shaded undisturbed areas. Steeply sloped areas should be protected against erosion.InteriorInsulation, Air and Moisture
SealingShell design will meet or exceed current Energy Star andStretch Code standards, features will include high thermal performance with continuous insulation at outside plane, integrated
air sealing, and cavity insulation. Products (e.g. rigid foam, flashing, building tape) to be acquired through Dow – HFH Gifts in Kind partnership when possible. Attic (R60): cellulose
in floor bays above finished living spaces with Propa or solid draft stops as necessary, attic hatch to have R-60 rigid foam, weatherstripping and blocking to stop loss of cellulose.
Note: cellulose in attic will extend above framing – attic not suitable for storage.Exterior Walls: dense pack cellulose inside 5 ½” walls (R20) plus2” rigid foam (R10) on exterior of
sheathingBasement walls: R10 XPS for unfinished space, R20 XPS for finished space.Electrical and plumbing openings between floors to be sealed with firestop.Other: rigid foam board in
window and door headers where possible.
MechanicalsHeat and hot water sources and systemswill be appropriate to the design of the house with the goal to minimize energy and long term maintenance and repair costs. Air conditioning
via mini splits may be provided when mini splits are used for heating.
Electrical Service: 200 Amp, with service panel and circuit breakers acquired through Schneider Electric - HFH Gifts in Kind partnership. All bulbs to be LEDs or compact fluorescent.
Minimum of one overhead light fixture in each room, plus one fixture over kitchen sink and one over bathroom vanities.All entrances to have exterior-rated fixture w/interior switch.
One motion detector flood at main entrance. No bedroom closet lights.Air flow: Constant duty rated exhaust fan (100 CFM minimum capacity) programmed to run at constant vent rate (~
35 cfm but tbd based on house testing), vented to exterior. (Generally installed in 2nd floor bath.) Kitchen range hood to be vented outdoors. (If range is not installed on exterior
wall, 6” soffited exhaust ducts to be installed.)Water: include town meter, drains to be town sewer (where possible), both tied in at foundation. Supply piping to be PEX or copper. Drain,
waste and vent to be ABS.
Fixturesand AppliancesAll light fixtures to have sockets for LED or compact fluorescent bulbs.All ceiling fan fixtures to be Energy Star rated.Kitchen: drop-in single or double bowl
stainless sink with basket strainer and water sense rated faucet.Full Bath: 24” to 30” vanity with basicone piece top and water sense rated faucet (flow rate <= 2.0 gpm); high-efficiency
toilet (< 1.28 gallons per flush); 60” fiberglass tub/shower surround with low-flow showerhead.Half Bath: 24” vanity with basic one piece top and water sense rated faucet (flow rate
<= 2.0 gpm); high-efficiency toilet (< 1.28 gallons per flush)Laundry: washer and dryer hook-ups in location shown on plan.A floor drain and drain pan shall be considered for all clothes
washers and hot water heaters with greater than 6 gallons of storage capacity.Exterior: at least one frost-free faucet w/interior shutoff.Basic refrigeratorand gas or electric range
provided by Habitat from Whirlpool Giftin Kind catalog subject to Whirlpool’s continuing participation in the Habitat Gift in Kind (GIK) program. Basic exterior vented range hood provided
by Habitat or the cost of the range hood provided to the homeowner towards the purchase of a range hood/microwave combination. Clothes washer, dryer, dishwasher, garbage disposal and
microwave are owner options at owner’s expense. All appliances to be Energy Star compliant where possible.Walls and CeilingsWalls covered with Ultralight sheetrock or equivalent: 5/8”
on top floor ceilings, ½” elsewhere (bathrooms to have mildew-resistant panels). Basement stairwell finished to bottom of basement stairs or per plans. Interior ceilings to have one
coat primer and one or two coats latex ceiling paint. Interior walls to have one coat primer and two coats low-VOC eggshell finish. Kitchen Cabinets and CountertopsUse simple durable
kitchen cabinets. Typically this means all plywood sides, backs and drawers with solid wood face frames.Kitchen countertops and backsplashes will be plastic laminate.Total width of
base cabinets to be no more than 150 inches, the total width of wall cabinets to be no more than 216 inches and the total square feet of countertops, including sink, to be no more than
33 square feet without a special exception.Homeowner may have a choice of cabinet and countertop style and finish within specified budget.Interior Doors, Closets Shelves and TrimHollow-core
six-panel composite doors w/split jambs and colonial casing, Yale (or similar gift in kind provider) door hardware.Door and window trim to be 2 ½” paint-grade colonial casing. Windows
to have drywall or paint-grade wood returns. Sills, if used, to be fabricated from finger-jointed pine. Baseboards to be 3 ½” colonial finger-jointed pine.Interior doors and trim to
have one coat factory prime and one coat low-VOC semi-gloss finish.Closets to have 1x12 primed finger-jointed pine shelves finished with one coat low-VOC semi-gloss finish and wooden
clothes bars mounted on wooden cleats or metal shelf supports. Linen closets to have four shelves mounted on wooden cleats.Communications
Cable TV jacks in living room and all bedrooms. One telephone jack in living room.Stairs and Flooring FinishesMain staircase to feature triple 2x10 stringers, yellow pine treads with
nosing and finished with clear polyurethane, painted risers and skirts. Basement stairs if existing to be unfinished with 2x10 pine treads and closed risers, unskirted.Ceramic tile or
equivalent flooring in kitchen, bath and laundry spaces, also in entryways within 36” of exterior doors. 3/8” laminate flooring in bedrooms, hallways, living and dining rooms.