Closed cell foam - is it worth spending additional $5500?
IÃ¯Â¿Â½m trying to understand if going with an entirely spray foamed house for ~$5500 more is worth the extra cost or not. Hopefully some of you can help me understand the potential ROI. Thanks in advance!
HereÃ¯Â¿Â½s some details
forced air natural gas high efficiency ~96%
cost/ Therm = ~$0.63 (guessing this will rise but who knows by how much per year)
~3500 sq ft two story located in Minneapolis, MN
~1500 main floor, ~2000 2nd floor, extra space coming from living area above the garage
10Ã¯Â¿Â½ ceilings on main floor
9Ã¯Â¿Â½ ceilings in basement and 2nd floor
Basement will be unfinished for the time being
House will be built in a residential area with moderate tree coverage
2 adults, 2 kids (3 and 5 now)
Winter months - $300+
(average in old house was ~$250)
Summer months - $150+
(average in old house was ~$100)
based off my current house which isnÃ¯Â¿Â½t insulated as well but is smaller (~2000 sq ft above ground)
Current insulation plans
Walls Ã¯Â¿Â½ 2x6 with Blown in fiberglass to give R-21
Ceiling Ã¯Â¿Â½ thin layer of closed cell foam to seal ceiling, blown insulation over closed cell overall R-44
Basement Ã¯Â¿Â½ foil faced foamed placed on basement wall R-15 (not sure exactly on this)
Cost to insulate to this plan - ~$12k
All spray foam for above grade walls and ceiling Ã¯Â¿Â½ $17.5k
Can you help me understand if spending the extra $5500 is worth it? Any idea on the payback period? IÃ¯Â¿Â½m aware of some of the other benefits of foam over just R value like air sealing and the benefits that offers.