Gainfort & McKay House
Walls and Roof
Subslab assembly
Over the existing slab, R-20 (4 inches) of extruded polystyrene (XPS) rigid foam insulation is laid down and then a new slab is poured. Rigid XPS (R-15) is installed along the foundation walls, 3 inches thick on the exterior and 1.5 inches thick on the interior, before the new slab is poured.
Subslab R-value
20.0
Slab edge R-value
20.0
Above grade wall assembly
The double-wall construction consists of a 2x6 24-inch on-center outer wall and a 2x4 24-inch on-center inner wall spaced 0.5 inches apart with staggered studs to provide a 9.5-inch cavity that is filled with R-33 of blown cellulose. The outer wall is sheathed with CDX plywood, covered with a layer of vapor-permeable, self-adhered, air and water barrier house wrap over which are installed 1x3 furring strips and fiber cement siding.
Above grade wall R-value
33.0
Flat attic assembly
The highly insulated roof has R-33 of blown cellulose between the ceiling joists,plus R-39 of rigid insulation installed above the roof sheathing for a whopping R-72 insulation value. The isocyanurate foam is protected with an adhered cover board plus a modified bitumen roof membrane. The roof surface is slightly tapered to direct water to two drainage points, where stainless steel piping carries the rainwater to two outdoor cisterns, 1,000 gallon and 750 gallon, for garden irrigation.
Flat attic R-value
72.0
Windows and Doors
Window Assembly:
The windows feature: fiberglass frames, triple glazing, argon gas fill, two low-E coatings and a U-value of 0.20.
Average window U-factor
0.20
Solar Heat Gain Coefficient
0.29
Mechanical Systems
Space cooling - Manufacturer & Model
Split System: Heat Pump with Remote Outdoor Unit-Air-Source. Trane Model: 4TWZ0024A1
Space heating - Manufacturer & Model
Triangle Tube Model: Prestige Solo 110
Domestic hot water - Manufacturer & Model
Triangle Tube Model: Prestige Solo 110
Ventilation - Manufacturer & Model
ERV
Lighting Manufacturer and Model
LED and CFL
Lighting Efficiency
Mechanical Equipment Installation Details and Comments
A 94% AFUE high efficiency, condensing, propane-fired boiler will create hot water for both domestic use and space heating purposes. A combination of radiant tube floor heating on the 1st floor and a hydro-air system on the 2nd floor will provide the space heating. The cooling will be from a high-efficiency, 16 SEER, AC condenser.
Ventilation is provided by an energy recovery ventilator (ERV) which draws exhaust air from the bathrooms (and ventilates them) while simultaneously providing fresh air to the entire house.
Daylight will be the primary source of light. The electric lighting will be a mixture of CFL and LED fixtures.
Walls and Roof
| Subslab assembly |
Over the existing slab, R-20 (4 inches) of extruded polystyrene (XPS) rigid foam insulation is laid down and then a new slab is poured. Rigid XPS (R-15) is installed along the foundation walls, 3 inches thick on the exterior and 1.5 inches thick on the interior, before the new slab is poured. |
|---|---|
| Subslab R-value | 20.0 |
| Slab edge R-value | 20.0 |
| Above grade wall assembly |
The double-wall construction consists of a 2x6 24-inch on-center outer wall and a 2x4 24-inch on-center inner wall spaced 0.5 inches apart with staggered studs to provide a 9.5-inch cavity that is filled with R-33 of blown cellulose. The outer wall is sheathed with CDX plywood, covered with a layer of vapor-permeable, self-adhered, air and water barrier house wrap over which are installed 1x3 furring strips and fiber cement siding. |
| Above grade wall R-value | 33.0 |
| Flat attic assembly |
The highly insulated roof has R-33 of blown cellulose between the ceiling joists,plus R-39 of rigid insulation installed above the roof sheathing for a whopping R-72 insulation value. The isocyanurate foam is protected with an adhered cover board plus a modified bitumen roof membrane. The roof surface is slightly tapered to direct water to two drainage points, where stainless steel piping carries the rainwater to two outdoor cisterns, 1,000 gallon and 750 gallon, for garden irrigation. |
| Flat attic R-value | 72.0 |
Windows and Doors
Window Assembly:
The windows feature: fiberglass frames, triple glazing, argon gas fill, two low-E coatings and a U-value of 0.20.
| Average window U-factor | 0.20 |
|---|---|
| Solar Heat Gain Coefficient | 0.29 |
Mechanical Systems
| Space cooling - Manufacturer & Model | Split System: Heat Pump with Remote Outdoor Unit-Air-Source. Trane Model: 4TWZ0024A1 |
|---|---|
| Space heating - Manufacturer & Model | Triangle Tube Model: Prestige Solo 110 |
| Domestic hot water - Manufacturer & Model | Triangle Tube Model: Prestige Solo 110 |
| Ventilation - Manufacturer & Model | ERV |
| Lighting Manufacturer and Model | LED and CFL |
| Lighting Efficiency | |
| Mechanical Equipment Installation Details and Comments |
A 94% AFUE high efficiency, condensing, propane-fired boiler will create hot water for both domestic use and space heating purposes. A combination of radiant tube floor heating on the 1st floor and a hydro-air system on the 2nd floor will provide the space heating. The cooling will be from a high-efficiency, 16 SEER, AC condenser. |