NEXUS LEED Homes PresentationPresentation Transcript
LEED-H is Different from LEED-NC
Why LEED for Homes?
Independent third-party oversight
Provides framework for constructing a more environmentally sensitive project
Sets a goal for the project
Recognizes leadership in high quality green homebuilding
Why LEED for Homes?
System based on measurable results
Benefits to the homeowner include:
Lower energy and water bills
Better indoor air quality; reduced exposure to mold, mildew, and other indoor toxins
Reduced greenhouse gas emissions & other environmental benefits
Certified projects: 1027
Certified units: 1707
Certified Projects: 42
Certified Units: 74
Four levels of certification:
Certified, Silver, Gold, and Platinum
Eight categories in which to claim credits:
Innovation & Design
Location & Linkages
Energy & Atmosphere
Materials & Resources
Indoor Environmental Quality
Awareness & Education
Program intake meeting
Plan and spec review
Questions and requirement clarifications
Certification call with the USGBC
LEED for Homes Prerequisites
Shown on the next 21 slides
Prepare for Intake Meeting – review credits
Select credits at Intake Meeting
Assign responsibility for each credit
Select LEED for Homes target level
Complete Durability Risk Evaluation Form
Identify durability issues
Develop measures to address issues
Identify moisture control measures needed
(expanded next slide)
Incorporate measures in construction plans
List all measures – locations – in checklist
Moisture Control Measures 1 (Durability Planning)
Tub, shower, spa – non paper faced backer board
Kitchen, bath, laundry, spa – use water resistant flooring (no carpet)
Entry area within 3’ of door – use water resistant flooring (no carpet)
Tank water heater in or over living space – install drain and drain pan
Moisture Control Measures 2 (Durability Planning)
Cloths washer in or over living space – install drain and drain pan or install accessible single throw supply valve.
Conventional cloths dryer – exhaust directly to outdoors
Condensing cloths dryer – install drain and drain pan
Builder must have a quality management process in place
Builder must inspect and check off each measure in a durability checklist
Stockpile and protect topsoil from erosion
Control the path and velocity of runoff
Protect sewer inlets, streams, and lakes
Provide swales to divert water from hillsides
Stabilize soils on sloped areas
No Invasive Plants
Introduce no invasive plants into the landscape
ENERGY STAR Homes
Meet the performance requirements for ENERGY STAR Homes
Third party Inspections
Reduced Distribution Losses
Do not install ducts in exterior walls unless extra insulation is added that maintains the UA value of an exterior wall without ducts
Ducts run in interior walls must be continuous hard ducts. Seal duct joints and seams before walls are enclosed.
Refrigerant Charge Test
Provide proof of proper refrigerant charge of air conditioner systems (homes with AC)
Framing Waste Order Factor Limit
Limit overall framing waste factor to 10% or less
Calculate overall waste factor if any portion exceeds 10%
FSC Certified Tropical Wood
Provide all wood product suppliers with notice containing all the following:
Builder's preference is to purchase products containing tropical wood only if FSC certified.
Request country of manufacture of each product supplied.
Request a list of FSC-certified tropical wood products the vendor can supply.
If tropical wood is used, use only FSC-certified tropical wood products .
Construction Waste Management Planning
Investigate and document local options for diversion (recycle, reuse) of all major waste stream constituents including cardboard and household recyclables.
Document diversion rate for construction waste.
Basic Combustion Venting Measures
No unvented combustion appliances allowed.
A carbon monoxide detector must be installed on each floor of every unit.
All fireplaces and woodstoves must have doors
Space and water heating equipment that involves combustion must meet one of the following
designed and installed with closed combustion
designed and installed with power-vented exhaust
located in detached utility building or open air facility
Basic Outdoor Air Ventilation
Design and Install whole building ventilation system that complies with ASHRAE Standard 62.2-2007
Basic Local Exhaust
Design and install local Exhaust systems in all bathrooms and kitchen to meet Section 5 of ASHRAE 62.2-2007.
Kitchen range hood >= 100 cfm.
Bathroom fans >= 50 cfm.
Design and install fans and ducts to meet Section 7 of ASHRAE 62.2-2007.
Exhaust air to outdoors.
Use ENERGY STAR labeled bathroom exhaust fans.
Room by Room Load Calculations
Forced air: perform duct calculations (ACCA Manuals J and D and ASHRAE Fundamentals or equivalent) and install accordingly
Non ducted: perform design calculations (ACCA Manuals J and D and ASHRAE Fundamentals or equivalent) and install accordingly
Install air filters MERV >= 8.
Forced air: ensure air handlers maintain adequate pressure and air flow, air filter housings are airtight.
Non Ducted: MERV 8 in mechanical ventilation if applicable.
Radon-Resistant Construction in High Risk Areas
In EPA Zone 1, design and build home with radon-resistant construction techniques as prescribed by EPA, International Residential Code, Washington State Ventilation and Indoor Air Quality Code, or equivalent
No HVAC in Garage
Place all air-handling equipment and ductwork outside fire-rated envelope of garage
Provide home's occupants with basic operations and maintenance owner's manual and a one hour walk through
Primary Roles in LEED-H
Keep all prerequisites in mind
Get a provider involved as early as possible
Collect the proper documentation in an organized system (Assign responsibility)
Use the reference guide for guidance on program requirements
Don't chase points - do what makes sense for the project