Given that the house was designed to be built with lightweight materials, a mass wall dividing the solarium from the main space was included to mitigate energy fluxes and maintain any heat absorbed during the day. The mass wall is 23 feet long, 14 feet high, with a width that varies from 5.5 to 16 inches. The wall surface area maximizes the rate of thermal transfer and the shape allows material with little room for flow. Once the final design was chosen, guides were cut using a CNC milling device. The more than 100 guides were then used to hand cut a high density polystyrene formliner that allowed for the wall to be completed in a single three hour concrete pour.
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