Midcentury Deep Energy Makeover by [bundle] design studio

"The main goal of this retrofit project was to take a home that was built in 1952 and get it ready for the next 100 years."

Homeowner

Key Features

• Walls: Double wall retrofit, R-23 total: existing 2x4 16" o.c. with fiberglass batts, replaced drywall with CDX plywood, horizontal 2x3s 24" o.c. and R-11 fiberglass batts and drywall. On exterior, topped old 1x sheathing with self-adhered WRB, metal siding.
• Roof: Gable roof: Covered existing 1x sheathing with membrane taped, new 9.5" I joists, OSB, self-adhering membrane; composite shingles.
• Attic: Vented vaulted ceilings: 5.5" + 8.5" R-54 fiberglass batts.
• Foundation: Vented crawl space: batt insulation in 2x8 floor. Topped existing subfloor with ½" EPS, radiant floor tubing, 2" poured concrete slab.
• Windows: Thin-film triple-pane, argon-filled, low-e, fiberglass frame; U=0.18, SHGC=0.30.
• Air Sealing: 1.34 ACH50, all edges and holes sealed with joint sealer, vapor air barrier with sealed edges on existing roof deck, self-adhered WRB over existing sheathing.
• Ventilation: HRV, MERV 13 filters, separately ducted in conditioned attic.
• HVAC: Air-to-water C02 heat pump for hot water and radiant floor heating. 5.2 COP.
• Hot Water: Air-to-water CO2 heat pump for hot water and radiant heat. 119-gal, 3.00 EF.
• Lighting: 100% LED.
• Appliances: ENERGY STAR refrigerator, dishwasher, clothes washer, heat pump dryer.
• Solar: 13.44 kW, 42 320-W rooftop panels, passive solar design.
• Water Conservation: EPA WaterSense showerhead, smart recirculation pump.
• Energy Management System: Smart thermostats.
• Other: EV charging; accessible floorplan, shower; low-VOC paints, finishes.