This document summarizes the key aspects of a holistic design for a sustainable home retrofit project. The retrofit aims to improve the structure, weather barrier, insulation, air tightness, moisture management, ventilation, comfort, daylighting, durability, design, lifecycle costs, environmental impact, and deconstructability of the home. Schematic designs and typical assembly details are provided to illustrate the proposed envelope upgrades, including high performance walls, roof, slab, and basement designs. Performance targets for heating loads, efficiency, and air tightness are also listed.
25. Holistic Approach
• Set goals for performance and design
• Overlay architectural program
• Make the home safe for people (code compliance)
• Control temperature, air, and moisture
• Add ventilation
• Make the envelope air- and weather-tight
• Add continuous insulation to meet the energy goals
• Assess moisture transfer through shell
• Design robust climate zone-appropriate assemblies
27. Schematic
DEEP ENERGY REDUCTION RETROFIT (AFTER) TYPICAL EXISTING BUILDING (BEFORE)
OPTIONAL SOLAR THERMAL
OR SOLAR PHOTOVOLTAIC
SO ADIN R)
SH MM
LA
(SU
SUPPLY AIR
R
G
E
PAS
SIVE
HEA S
T GA OLAR
(WIN IN
TER S EXTRACT AIR
)
RETROFIT CONDITION EXISTING CONDITION
INTERNAL
- ADVANCED WINDOWS - INSUFFICIENT INSULATION
HEAT GAINS
AND DOORS - LOW-PERFORMANCE
- PEOPLE
- AIR-TIGHTNESS LAYER WINDOWS AND DOORS
- EQUIPMT.
- CONTINUOUS INSULATION - AIR LEAKAGE
PACKAGE - NO VENTILATION
EXHAUST
AIR-INTAKE
RETROFIT CONDITION EXISTING CONDITION
HEAT-RECOVERY LARGE "ACTIVE"
- WATER PROOFING - NO WATER PROOFING
VENTILATION & MECHANICAL SYSTEM
AND MANAGEMENT AND MANAGEMENT
SMALL HEATER - FURNACE OR BOILER
- ADDED INSULATION - NO INSULATION AT AND
- MITIGATION OF BELOW GRADE
THERMAL BRIDGES - THERMAL BRIDGES
28. First Floor Plan
1. Entry
2. Powder room
3. Mud room/ laundry
4. Living room
DN
8 1 2 3 9 5. Kitchen
6. Dining area
7. Family area
UP DN
8. Covered entry
DN
9. Rear entry
10.Patio
6 10
4 5
7
N
0 2' 4' 8'
29. Basement Floor Plan
1. Homeschool Room
2. Mechanical
3. Unexcavated
3
UP
1 2 3