I want to build a house to passive house standards and keep it to a relatively small budget by potentially doing some of the build myself. I stumbled upon the history of ICFs and Gigacrete while researching building materials, but haven't seen a lot of passive houses built with these type of insulating materials. Is there a reason why? Insulating concrete forms would seem to be a pretty efficient method of building houses, and 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 construction rookie - but ICF as a construction system has got me interested.
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