Name
Rachel Conly
12/30/2020 21:17
Building company
Thompson Johnson Woodworks
Builder's name
Heather Thompson
Architecture firm
Rachel Conly Design LLC
Architect's name
Rachel Conly
Passive building consultant
Rachel Conly
Date when the project began or is expected to begin (enter "01" for the day if you only know the month and year)
2014
Type of structure
wood-frame
Town or city
Peaks Island
State or province
Maine
Original construction year
1900
Year when passive building work was or will be completed
2016
Lot type
suburban
Building use type
residential
Brief description of the retrofit project
Deep energy retrofit, dormer additions, complete new interior and exterior
Type of retrofit
whole-building-retrofit
Why did you choose to do a whole, partial, or phased retrofit?
needed total update/client request
What were the main goals of the retrofit?
total rebuild- both
Was this a registered historic building?
no
Did you use historic tax credits?
no
Total area of the structure (in square feet)
1900
Passive house certified?
no
If certified by another group, please list the organization:
How many months did the renovation take? If ongoing, how many months is the renovation expected to take?
24
Were people living in the building during renovation?
no
Air tightness (ACH)
17ACH50
Energy use intensity (EUI)
n/a
Annual electricity usage (kWh)
10,486
Annual electricity costs (USD)
1874.71
Annual heat usage (kBtu)
Annual heat costs (USD)
1972
Heat source(s)
existing-boiler
Annual hot water usage (kWh)
Annual hot water cost (USD)
n/a
Hot water system
electric
Air tightness (ACH)
.04ACH50
Energy use intensity (EUI)
Annual electricity usage (kWh)
Annual electricity costs (USD)
Annual heat usage (kBtu)
Annual heat costs (USD)
Heat source(s)
heat-pump, electric, wood-stove
Annual hot water usage (kWh)
Annual hot water cost (USD)
Hot water system
electric
Is the retrofit now using renewable energy sources?
no
If using renewable energy, please describe the type, kWh generation and any other system specs
Were/are any passive house certified materials used?
none
Please describe your reasoning in using certified or non-certified materials
costs
availablity
Door type before renovation
Uninsulated/wood
Door type after renovation
Lemieux double pane
Please describe any methods you're using for controlling thermal bridging, water, vapor and air movement related to doors
U-value of doors before renovation
U-value of doors after renovation
Window type before renovation
Old wood double hung, single pane
Window type after renovation
Jeld-Wen double pane
Please describe any methods you're using for controlling thermal bridging, water, vapor and air movement related to windows
all exterior insulation
nothing specific to windows
U-value of windows before renovation
U-value of windows after renovation
Materials in the wall assembly before renovation (listed from outside to inside)
Materials in the wall assembly after renovation (listed from outside to inside)
Please describe methods for controlling thermal bridging, water, vapor and air movement related to the wall assembly, e.g. materials used and construction
R-value of wall assemblies before renovation
13
R-value of wall assemblies after renovation
40
What rough percentage (0 - 100) of the wall assemblies have thermal bridges after renovation?
2
Materials in the roof assemblies before renovation
undersized 2x6 wood rafters
Materials in the roof assembly after renovation
Please describe methods for controlling thermal bridging, water, vapor and air movement related to the roof assembly, e.g., materials and construction
roof section: asphalt shingles, ice and water shield on 1x sheathing,; closed cell foam gussets added to 2x6 framing; dense pack cellulose
R-value of roof assemblies before renovation
0
R-value of roof assemblies after renovation
46
Please upload up to four images of the structure and/or retrofit
Ventilation strategy (type and number of ERV or HRV) before renovation
None
Ventilation strategy (type and number of ERV or HRV) after renovation
Venmar 515 ECM
If any make-up air systems were used, please describe
custom damper connected to pressure gauge placed behind refrigerator
Please describe any thermal bridging issues before renovation
No preventative measures against thermal bridging
Please describe strategies to mitigate thermal bridging after the renovation
Full exterior insulation wrap of building
Please describe any moisture issues before renovation
Old, poor flashing, no ground water control, etc.
Please describe the moisture control strategy after renovation
Added: rain screen, air barriers, vapor retarders, vapor barrier at slab, drainage, overhangs
On a scale of 1 to 10, what was the perceived comfort of the structure before renovation?
On a scale of 1 to 10, what is the perceived comfort of the structure after renovation?
What was the total cost, or estimated cost, of design for the retrofit project (in dollars)?
12-15% of total cost
Total construction cost per square foot, or estimated cost, for the project (in dollars)
330
Roughly what percentage (0 - 100) of the project was financed?
100
What types of funding did you use?
personally-funded
Total door cost (in dollars)
Total windows cost (in dollars)
Total wall assembly cost (in dollars)
Total roofing cost (in dollars)
Total ventilation cost (in dollars)
Total foundation cost (in dollars)
What is the expected life of this retrofit (in years)?
100
If you calculated it, what was the energy return on investment, i.e. the EROI (in dollars)?
On a scale of 1 to 10, how much did you take the EROI into consideration before starting the project (if it was calculated)?
Please upload up to four images of the structure and/or retrofit
What would you say was the most successful part of the process?
The team: It was essential that the client, builder and designer were all on board with the mission and communication was strong between all parties. It was also critical that the builder was very skilled at high performance details.
Rate the following in terms of difficulty...
Section 1: Contact
The first section is just to get your contact info...
Working with your builder and/or architect
Procuring materials
Technical challenges
Local regulations and rules
Financing
What do you wish you knew before starting the project?
Issues of carbon footprint
If you do another retrofit, what would you do differently?
Less foam- specifically exterior poly-iso. Would prefer Rockwool or wood fiber insulation instead.
Less concrete in foundation by using a wooden slab 2 layers of ply over insulation
Any additional notes or comments