I want to build a house to passive house standards and keep it to a relatively small budget. I stumbled upon ICFs and Gigacrete while researching building materials, but haven't seen a lot of passive houses built with these materials. Is there a reason why? They seem to be a pretty efficient method of building houses, can be air tight without a lot of additional work, dont have thermal bridges, and they tend to have a hard time catching fire (important where I live). I'm looking for an educated opinion because I am such a rookie.
Current info and references for Legalett Air Heated Shallow Foundation system
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