I’m weighing the pros and cons of having gypcrete poured vs. pouring concrete. The project is a 1200 sf single story house w/ RFH throughout. About half of the house will have wood flooring, i.e. sleepers w/gyp. or concrete in between. Remainder will be tile or carpet over slab. It seems to me that the concrete will be cheaper and provide more mass. The extra weight seems easily handled by going to 11 7/8″ joists. Am I missing something here?
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More mass means a slower response time. So if the outside conditions change (sun, air temp), then the house takes a while to adjust. On the other hand, if you have hot days and cold nights, the extra mass can allow you to turn off the heating system a month earlier/later. More mass (off the ground) is definitely bad in an earthquake.