Sunnyvale Bungalow Renovation

PROJECT

Project Name: Sunnyvale Bungalow Renovation
Completion Date:
2017
Building Type:
Single Family Home
Project Description:

These clients requested an extention to their existing 2-bedroom, 1 bathroom home and a repair of their foundation, which was cracked and rotating. Despite our best efforts to save much of the original structure, the only part we could salvage was the garage slab and footings.  The rest of the house replaced the existing footprint, with a small expansion to the rear yard.  The size of the house was increased from 1,100 sf to 1,500 sf, and a careful reconfiguration allowed the addition of another bedroom and small bathroom. New framing allowed us to vault the main living space to make the house feel expansive and the addition of a large, glass sliding door opened up the family room to a big new deck at the rear of the property.  At 1.43 ACH n50, this project did not quite meet Passive House air-tightness levels for a renovation, but the project was modelled in the PHPP and is performing in line with the predicted model.  A full solar array has been added to the rear, south-facing roof slope and is expected to produce sufficient energy to cover both house and vehicle-charging needs. 

Location:
Balsam Avenue
94085 Sunnyvale, CA
No. of units:
1
Construction Type:
Wood frame construction
Construction Cost:
$400


TEAM

Owner:
-
Architect/Designer:
Bronwyn Barry
Engineer/s:
Sezen Moon Structural Engineering
PH Consultant:
Allen Gilliland
Contractor:
One Sky Homes
Other:
Miscelaneous:


PREDICTED PERFORMANCE

METRIC VALUES

Treated Floor Area:
1357 ft2
126 m2
Typical Calc. Area:
1488 ft2
Exterior Walls:
29.18 hr.ft2.ºF/BTU
0.195 W/m2K
Floor/Slab:
31.06 hr.ft2.ºF/BTU
0.183 W/m2K
Roof:
40.96 hr.ft2.ºF/BTU
0.139 W/m2K
Overall Window:
4.98 hr.ft2.ºF/BTU
1.140 W/m2K
Window Frame:
4.73 hr.ft2.ºF/BTU
1.200 W/m2K
Window SHGC:
0.49
0.49 %
Entry Door:
5.12 hr.ft2.ºF/BTU
1.108984375 W/m2K
Ventilation:
68.80 %
68.80 %
Heating Source:
Fujitsu heat pump
Cooling Source:
Fujitsu Heat Pump
Hot Water Source:
Stiebel Eltron Heat Pump WH
Airtightness:
0.00 ACH50
Green materials:
Reclaimed interior windows, mineral wool rigid insulation.
Annual Heat Demand:
6.02 kBTU/ft².yr
18.99 kWh/m2yr
Heating Load:
4.12 BTU/ft².hr
13.00 W/m2
Primary Energy Value:
22.82 kBTU/ft².yr
71.99 kWh/m2yr


CERTIFICATION

Certification:
Issued by: