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Deep Energy Retrofits Building Enclosures—Part 1 Whole House; (Above Grade). Rob Dumont [email protected]. Case Study Deep Energy Retrofit Double-Wall Double Roof Retrofit. Location: Saskatoon, Canada Latitude 52 N Annual Heating Degree Days: 10950 Fahrenheit 1968 Bungalow . - PowerPoint PPT Presentation
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Deep Energy RetrofitsDeep Energy RetrofitsBuilding Enclosures—Part 1Building Enclosures—Part 1Whole House; (Above Grade)Whole House; (Above Grade)
Rob DumontRob [email protected]
Case StudyCase StudyDeep Energy RetrofitDeep Energy RetrofitDouble-Wall Double Roof Double-Wall Double Roof RetrofitRetrofit
Location: Saskatoon, Canada Location: Saskatoon, Canada Latitude 52 NLatitude 52 N Annual Heating Degree Days: 10950 Annual Heating Degree Days: 10950
Fahrenheit Fahrenheit 1968 Bungalow 1968 Bungalow
Pre-RetrofitPre-Retrofit
Post RetrofitPost Retrofit
Pre-RetrofitPre-Retrofit
Energy ResultsEnergy Results Peak Heat Loss reduced from 13.1 kW to Peak Heat Loss reduced from 13.1 kW to
5.5 kW5.5 kW
Step 1. Cut off eaves and Step 1. Cut off eaves and wrap roof and walls with wrap roof and walls with polypoly
Step 2. Add second roofStep 2. Add second roof
Step 3. Add exterior wall Step 3. Add exterior wall systemsystem
Step 4. Finish details Step 4. Finish details around windows & doorsaround windows & doors
Insulation of walls & Insulation of walls & bsmt wallsbsmt walls
R40 on Roof ; R40 on R40 on Roof ; R40 on Walls; R40 in Bsmt WallsWalls; R40 in Bsmt Walls
Post Retrofit—Asphalt Post Retrofit—Asphalt Shingles, Stucco WallsShingles, Stucco Walls
Comparison of Pre and PostComparison of Pre and Post
Pre-RetrofitPre-Retrofit Post-Post-RetrofitRetrofit
RatioRatioPost/PrePost/Pre
Attic InsulationAttic Insulation R20R20RSI 3.5RSI 3.5
R63R63RSI 12.5RSI 12.5
3.63.6
Wall InsulationWall Insulation(Nominal)(Nominal)
R 7R 7RSI 1.2RSI 1.2
R 47R 47RSI 8.3RSI 8.3
4.34.3
Bsmt Floor Bsmt Floor InsulationInsulation
R 0R 0 No change ;No change ;Later R20 was Later R20 was addedadded
WindowsWindows R2R2 R3R3 1.51.5
Air TightnessAir Tightness 2.95 ac/h @50 2.95 ac/h @50 PaPa
0.29 ac/h0.29 ac/h@50 Pa@50 Pa
0.100.10
Advantages of Deep Advantages of Deep Exterior Envelope Exterior Envelope RetrofitsRetrofits
1. Conduction losses greatly reduced1. Conduction losses greatly reduced 2. Air leakage great reduced2. Air leakage great reduced 3. Heating system can be greatly simplified.3. Heating system can be greatly simplified. 4. Works best when simultaneous need for 4. Works best when simultaneous need for
upgraded siding and roofingnupgraded siding and roofingn 5. No interior space loss5. No interior space loss 6. House can be occupied during work.6. House can be occupied during work.
DisadvantageDisadvantage Attic upgrades are usually much less Attic upgrades are usually much less
expensive than a double roof retrofit, but expensive than a double roof retrofit, but in some cases the attic is non-existent or in some cases the attic is non-existent or inaccessible.inaccessible.