Southworth Retirement Residence
Walls and Roof
Subslab assembly
Foundation - There is no slab. A hardwood floor is fastened directly on ¾” advantech which in turn is fasted to 2X4 sleepers over 12” of salvage polyisocyanurate foam insulation (R-55), above a vapor barrier and 30” of compacted sand. The four foot foundation frostwall is insulated from the inside with 3” of rigid insulation board (polyiso) that makes direct contact with the wall insulation (dense packed cellulose). There is neither basement nor crawl space.
Subslab R-value
55.0
Above grade wall assembly
The bearing exterior wall is 2X4 construction covered (going outward) with 1/2” plywood then 2” of rigid polyiso foam insulation then tape and rain drain then horizontal strapping and finally 3/4” white cedar vertical siding. A second 2X2 wall was built 12” inside the building and gusseted to the 2x4 wall with ½” plywood gussets. It is nonbearing and rests on the subfloor (advantec) which was held back to allow the polyiso subfloor insulation to be in direct contact with the dense packed cellulose wall insulation that was blown in between the two walls. The wall R-factor is calculated at R-49 for 12” of cellulose plus 2” of polyiso. This effort was to assure continuous thermal isolation and is compromised only by the gussets and the window and door bucks.
Above grade wall R-value
49.0
Roof Assembly
The roof structure was built with 37 trusses each spanning 26ʼ with a 9/12 roof pitch. These attic trusses were customized by a horizontal 2X6 added 40” up from the bottom chord to allow for 40” of loose packed cellulose below the attic walking surface. To this basic roof rectangle of 26ʼ X 72ʼ were added three site built bump-outs with 2/12 roof pitches (see photos). All parts of the roof received continuous eve venting with double sheathing up to above attic insulation to assure a cold roof. The attic has gable vents.
Windows and Doors
Window Assembly:
ThermoTech Fiberglas Fenestrations
Door Assembly:
ThermoTech Fiberglas Fenestrations
Average window U-factor
0.19
Solar Heat Gain Coefficient
0.61
Mechanical Systems
Domestic hot water - Manufacturer & Model
80 sqft of solar collector, 120 gallon Vaughn stone lined tank with electric resistance backup.
Ventilation - Manufacturer & Model
Zehnder
Lighting Manufacturer and Model
Lighting Efficiency
Mechanical Equipment Installation Details and Comments
EPA certified wood stove (Morso from Denmark) with dedicated combustion oxygen for primary heat. 2250 watts of electric resistance heating for backup: five 450 watt ECO wall mounted heaters each with its own thermostat. No mechanical cooling. Full window sun shades on the south facing windows.
Envelope
Air Changes per hour, ACH50
0.65 ACH50
Air Changes per hour, CFM50
Walls and Roof
| Subslab assembly |
Foundation - There is no slab. A hardwood floor is fastened directly on ¾” advantech which in turn is fasted to 2X4 sleepers over 12” of salvage polyisocyanurate foam insulation (R-55), above a vapor barrier and 30” of compacted sand. The four foot foundation frostwall is insulated from the inside with 3” of rigid insulation board (polyiso) that makes direct contact with the wall insulation (dense packed cellulose). There is neither basement nor crawl space. |
|---|---|
| Subslab R-value | 55.0 |
| Above grade wall assembly |
The bearing exterior wall is 2X4 construction covered (going outward) with 1/2” plywood then 2” of rigid polyiso foam insulation then tape and rain drain then horizontal strapping and finally 3/4” white cedar vertical siding. A second 2X2 wall was built 12” inside the building and gusseted to the 2x4 wall with ½” plywood gussets. It is nonbearing and rests on the subfloor (advantec) which was held back to allow the polyiso subfloor insulation to be in direct contact with the dense packed cellulose wall insulation that was blown in between the two walls. The wall R-factor is calculated at R-49 for 12” of cellulose plus 2” of polyiso. This effort was to assure continuous thermal isolation and is compromised only by the gussets and the window and door bucks. |
| Above grade wall R-value | 49.0 |
| Roof Assembly |
The roof structure was built with 37 trusses each spanning 26ʼ with a 9/12 roof pitch. These attic trusses were customized by a horizontal 2X6 added 40” up from the bottom chord to allow for 40” of loose packed cellulose below the attic walking surface. To this basic roof rectangle of 26ʼ X 72ʼ were added three site built bump-outs with 2/12 roof pitches (see photos). All parts of the roof received continuous eve venting with double sheathing up to above attic insulation to assure a cold roof. The attic has gable vents. |
Windows and Doors
Window Assembly:
ThermoTech Fiberglas Fenestrations
Door Assembly:
ThermoTech Fiberglas Fenestrations
| Average window U-factor | 0.19 |
|---|---|
| Solar Heat Gain Coefficient | 0.61 |
Mechanical Systems
| Domestic hot water - Manufacturer & Model | 80 sqft of solar collector, 120 gallon Vaughn stone lined tank with electric resistance backup. |
|---|---|
| Ventilation - Manufacturer & Model | Zehnder |
| Lighting Manufacturer and Model | |
| Lighting Efficiency | |
| Mechanical Equipment Installation Details and Comments |
EPA certified wood stove (Morso from Denmark) with dedicated combustion oxygen for primary heat. 2250 watts of electric resistance heating for backup: five 450 watt ECO wall mounted heaters each with its own thermostat. No mechanical cooling. Full window sun shades on the south facing windows. |
Envelope
| Air Changes per hour, ACH50 | 0.65 ACH50 |
|---|---|
| Air Changes per hour, CFM50 |