Name
Alan GIbson
03/05/2021 21:22
Building company
GO Logic
Builder's name
Alan Gibson
Architecture firm
GO Logic
Architect's name
Passive building consultant
Alan Gibson
Date when the project began or is expected to begin (enter "01" for the day if you only know the month and year)
01/07/2019
Type of structure
wood-frame
Town or city
Belfast
State or province
ME
Original construction year
1870
Year when passive building work was or will be completed
2021
Lot type
suburban
Building use type
residential
Brief description of the retrofit project
Demolished existing ell and rebuilt it and renovated existing main house.
Type of retrofit
whole-building-retrofit
Why did you choose to do a whole, partial, or phased retrofit?
Need to be renovated and budget allowed. Owner driven.
What were the main goals of the retrofit?
Leave as much exiting structure and interior finishes- insulate and air seal existing structure. Triple glazed windows and doors all new exterior finishes
Was this a registered historic building?
no
Did you use historic tax credits?
no
Total area of the structure (in square feet)
2640
Passive house certified?
no
If certified by another group, please list the organization:
n/a
How many months did the renovation take? If ongoing, how many months is the renovation expected to take?
Were people living in the building during renovation?
no
Air tightness (ACH)
20
Energy use intensity (EUI)
Annual electricity usage (kWh)
Annual electricity costs (USD)
Annual heat usage (kBtu)
Annual heat costs (USD)
Heat source(s)
existing-boiler
Annual hot water usage (kWh)
Annual hot water cost (USD)
Hot water system
other
Air tightness (ACH)
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
Annual hot water usage (kWh)
Annual hot water cost (USD)
Hot water system
air-source-heat-pump
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?
Please describe your reasoning in using certified or non-certified materials
didn't really come up
Door type before renovation
typical uninsulated exterior door
Door type after renovation
Kneer-Sud
Please describe any methods you're using for controlling thermal bridging, water, vapor and air movement related to doors
over insulation of frame, air sealed to rough opening
U-value of doors before renovation
U-value of doors after renovation
.16
Window type before renovation
single pane double hung, wood
Window type after renovation
triple glazed pvc
Please describe any methods you're using for controlling thermal bridging, water, vapor and air movement related to windows
installed in middle of the wall assembly, air sealed, sill pan
U-value of windows before renovation
1
U-value of windows after renovation
.15
Materials in the wall assembly before renovation (listed from outside to inside)
Materials in the wall assembly after renovation (listed from outside to inside)
2x6 wall, sheathing, 6" EPS, rain screen, siding, trim
Please describe methods for controlling thermal bridging, water, vapor and air movement related to the wall assembly, e.g. materials used and construction
New layer of air sealed sheathing, continuous exterior insulation, rain screen, siding, trim
R-value of wall assemblies before renovation
10
R-value of wall assemblies after renovation
34
What rough percentage (0 - 100) of the wall assemblies have thermal bridges after renovation?
5
Materials in the roof assemblies before renovation
wood frame, some fiber glass insulation in attic
Materials in the roof assembly after renovation
wood frame, loose fill and dense packed cellulose
Please describe methods for controlling thermal bridging, water, vapor and air movement related to the roof assembly, e.g., materials and construction
New metal roof, vented
R-value of roof assemblies before renovation
20
R-value of roof assemblies after renovation
60
Please upload up to four images of the structure and/or retrofit
Ventilation strategy (type and number of ERV or HRV) before renovation
exhaust only fans.
Ventilation strategy (type and number of ERV or HRV) after renovation
Zehnder ERV CA350Q
If any make-up air systems were used, please describe
Please describe any thermal bridging issues before renovation
through out building assemblies
Please describe strategies to mitigate thermal bridging after the renovation
Continuous exterior insulation at walls and new foundation
Please describe any moisture issues before renovation
definite presence of moisture in basement.
moisture related rot to basement framing
Please describe the moisture control strategy after renovation
structure much more airtight and added the ERV.
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)?
Total construction cost per square foot, or estimated cost, for the project (in dollars)
203
Roughly what percentage (0 - 100) of the project was financed?
What types of funding did you use?
personally-funded
Total door cost (in dollars)
6000
Total windows cost (in dollars)
26.700
Total wall assembly cost (in dollars)
Total roofing cost (in dollars)
18.000
Total ventilation cost (in dollars)
8200
Total foundation cost (in dollars)
7.700
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?
Preserving existing old structure which had architectural integrity, while adding new space at a passive level.
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?
More comprehensive design process at the beginning.
If you do another retrofit, what would you do differently?
Remove existing foundation under the ell. Thought we could make it work, but the actual condition required a whole new foundation. Completely renovate the bathrooms from the beginning.
Any additional notes or comments
The success of the project was unifying the design and program, while modernising the house to fit contemporary lifestyle.