residential green building rating systems

Residential Green Building Rating Systems

Session 1 Part B

How the HSA worksRegional• Neutral Zone:

– 2,300 to 2,800 gsf conditioned• Adjusts the achieved point total

– Add 1 point for every 200 gsf < 2,300

– Deduct 1 point for every 200 gsf > 2,800

• Spreadsheet automatically calculates the HSA

LEED• Neutral Zone:

– gsf conditioned space +…– 2 Bedroom = 1,400– 3 Bedroom = 1,900– 4 Bedroom = 2,600

• Adjusts the award threshold with a logarithmic formula…– 3 bedroom 2,800 gsf +10– 4 Bedroom 2,800 gsf +2

• Let the spreadsheet do it!

NAHB: Neutral Zone: 2,501 to 3,999-Add 6 points to point total for < 2,500; Add 9 points for

< 2,000, etc- > 3,999 Adjust threshold up by one point

LEED: Integrated Design• How to accomplish a certified green home for less• LEED ID 1.2 Integrated project team, in addition to Builder include at

least three members with the following skill sets– Architect/Designer– Mechanical or energy engineering– Building science – Green building or Sustainable design– Civil/landscape

• At least monthly working meetings• Design the House as in integrated system

– Advanced framing: • Materials cost savings of about $500 or $1000 • 30% better insulation

– Or, high thermal mass wall with exterior insulation: No termite problems, local material

– Better windows– AC approx $450 per ½ ton

• LEED ID 1.4 Design Charrette 1-8 hour or 2-4 hour sessions

LEED: Durability Management

• Durability Planning– Risk Evaluation– Develop Measures to respond to risks, and…– The Mandatory Measures =

• Nonpaper-faced backer board• Water resistant flooring at kitchen, bath, laundry and entry• Water heater drain pan• Clothes washer drain pan or single throw valve

• Durability Management– Install the measures

• Third Party Verification (3 points)

Durability Guidelines

Durability Guidelines

The Credits

Regional• *

LEED• *

NAHB: ***

Accountability Form

NPPO

Regional• NPPO is Required, if...• It is required

LEED• SS 2.1 No Invasive plants

NAHB: 503.1.1 Natural Resource Inventory

Accountability Form

Invasive Plants

http://www.governor.state.az.us/AIS/Documents/AISMP2008.pdf

• Ordinance– Olive Trees– Mulberry– Bermuda Grass

• Sonoran Desert Conservation Plan:– Salt Cedar or Tamarisk– Giant Reed– Bermuda Grass– Fountain Grass

http://www.pima.gov/CMO/SDCP/reports%5Cd26%5C136INVSP.PDF

Invasive Plants

Site Selection

Regional• 1.1 a Outside CLS• 1.1.b Downtown Infill Incentive

District• 1.2.a Exceed open space

requirement by 50%• 1.2.b Develop at density of 75%

of max• 1.2.c Develop at density of 100%

of max

LEED• LL 2 Site Selection

– Not in 100 year floodplain– Not endangered species habitat– Not within 100 feet of wetlands– Not public park land– Not prime soils, unique soils, or

soils of state significance (farmland)

NAHB: 501.1.2 Lot Selection: Select a greyfield (previously developed) or EPA brownfield

Prime Farmland

• Web Site: http://websoilsurvey.nrcs.usda.gov/app/

ohmygod!

How to Navigate the Soils Site

LL 2.e How to Check Soils Identification go to: http://websoilsurvey.nrcs.usda.gov/app/ Click on the green button “Start WSS” On the left side, under “Navigate by…”, click on Address (If you don’t have an address see below) Enter Address, click view Set AOI (Area of Interest) with the rectangle tool in map tool bar Select Soil Data Explorer from top tab Select Suitabilities and Limitation for Use from second line of tabs (usually the default selection) On left, select land classification select Farmland classification at the bottom right of the Farmland Classification popup, click view rating At the upper right, click Add to shopping cart On the upper tab line click “Shopping Cart (Free)” click on checkout at upper right If No Address: To find the latitude and longitude of the property go to Pima County Mapguide Navigate to your property Under “-Map Tools & Map Info.-“, select Draw Point, click on Draw Point Click on property Select the point, so that it is highlighted Under “-Map Tools & Map Info.-“, select Get lat/Lon Copy these numbers down to input into the soil database above

Previously Developed

Regional• 1.3 75% of site was previously

developed– Not including farms, parks or

athletic fields– Older than 5 years

LEED• LL 3.3 75% of site was previously

developed– Preexisting paving, construction

or altered landscapes– Agricultural use, forestry use or

preserved natural area do not count

– Older than 5 years

NAHB: 501.1.2 Lot Selection: Select a greyfield (previously developed) or EPA brownfield

Previously Developed

• Pima County DOT MapGuide is your friend!

Infill/Edge

Regional• 1.4 Infill Site

– 50% of the site borders previous development

LEED• LL 3.1 Edge Development

– 25% of the site borders previous development

• LL 3.2 Infill– 75% of the site borders previous

development

NAHB: 501.1.1 Infill Lot –sites that are vacant or underutilized land, served by at least two existing physical installations: roads, electrical power, sewer, or water.

Infill/Edge

• Who’s your friend?

Community ServicesRegional• 1.5 within ¼ mile radius of bus

stop, shared use path or bike route

• 1.6.a within ¼ mile of 4 community services

• 1.6 b within ½ mile of 8 community services

LEED• LL 5 Community

Resources/Transit

– Walking route, not radius– From center of community (unless home is

more than ¼ mile from center)– Only 2 of each type count, 2 schools, etc

NAHB: 501.2.1 Access to Mass Transit: ½ mile radius to bus stop501.2.2 Sidewalks501.2.3 ½ mile of 6 community resources

Meet one of the following…

Within ¼ mile of # community services

Within ½ mile of # community services

Within ½ of transit Services that offer ## rides/weekday:

5.1 Basic 4 7 30

5.2 Extensive 7 11 60

5.3 Outstanding 11 14 125

Community Services

• Google Maps

Community Services

• Walkscore.com

Location and Linkages

Walkscore.com

Community Services

• Who’s your friend?

Right Click over the map

to get a measuring

tool

Existing Infrastructure

Regional• 1.7 Existing sewer and water

– Develop on a lot with existing municipal sewer and water service

LEED• LL 4 Existing Infrastructure

– Within ½ mile of water service and sewer service (from center of development)

NAHB: 501.1.1 Infill Lot –sites that are vacant or underutilized land, served by at least two existing physical installations: roads, electrical power, sewer, or water.

Common Space O&M

Regional• 1.8 O&M Manual for common

open space, retention, wildlife corridors, etc

LEED

NAHB:

Neighborhood Development

Regional• 1.9 credit for

– LEED ND– Enterprise Green Community– PAD like Civano

LEED• LL 1 LEED for Neighborhood

Development – Performance path

NAHB: Chapter 4: Site Design and Development. Not part of the scoring tool for an individual project

Questions