I justify it to myself by trying to eliminate the basement, so I'm moving my concrete up essentially. On my simple shaped ~2,000sqft house plan, that adds around 150,000 lbs to the exterior walls. For an exterior wall, a 6" core concrete is about 75lbs sqft (150lbs/ft^3), while a 2圆 wall assembly is around 12lbs sqft. In your thermal mass estimate, I bet an ICF house is closer to 3x the weight of a conventional house, with most of the difference in the walls. Concrete isn't immune to the pesky laws of thermodynamics. A flatter curve means you don't need to design for as large of a peak, but overall energy usage would be the same throughout a 24 hour period. The dampened curve is also probably why ICF manufactures love to point out how their HVAC systems can be smaller. But your point remains, insulation would be better year round.
#Zip share insulated windows
For cooling, shifting the peak cooling to the evening could be pretty beneficial as now you could simply open windows or have your ERV bringing in cooler exterior air. I did read through that, I think it is a great demonstration of how it impacts your house. Because they are relying on the fictitiously high claims of ICF R values. Be careful, some of the brands have thicker concrete cores, and thinner EPS than the typical 2.5" per side. Our plan is Amvic's R30, so we are a bit beyond traditional ICF R values. Typically, ICF contractors can do flatwork, windows, framing, and roofing, so we can get a shell built with one sub, and you don't have much to worry about with finding contractors that are familiar with ICF from there. We are planning an owner with ICF for the similar reasons. The only thermal buck in the test had pretty bad results. They all came out with their EPS thermal bucks instead. When the easiest solution was the answer. 10 years ago, the ICF manufacturers pooled money and did lots of testing on this, in order to come up with a uniform solution. The best assemblies will install/air seal the windows directly to the concrete, same with trusses or any other penetration. The other thing to remember with ICF is that the foam is not your air/water/vapor barrier. Probably why the ICF community will exaggerate it so much, it's just a decent bit better than the norm. Continuous R22 with a pretty solid (literally) air barrier is a decent bit better than a typical tract house, or most older homes with R13 haphazardly stuffed in the walls. Your thermal mass modified R value in the summer could be very high if you get 60* nights and 90* days. The numbers that ICF manufacturers like to brag are from when the outdoor temperature crosses the indoor temperature within the 24 hour window. At the end of the day, your true R value is what the foam is, R22 in most cases. Borst has an ICF thermal mass modified R-value calculator you can try, it's a bit finicky. The thermal benefit exaggeration is huge.
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