The equal thickness forms can be put together forwards, backwards, or sideways and still fit. More generic and universal ensures easier assembly for the not so strong in the brain. Less possible mistakes equals better chance for success.
Adding extra insulating layers on the exterior has lots of benefits. The two more important are as follows:
1. Dew point and freezing point moves into exterior foam layer
2. Enclosed concrete adds thermal mass to the inside of the house
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