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Crawl space insulation

last month

We recently had a bedroom addition put on . The bedroom is very cold. Theres a crawl space below the addition. Only the walls of the crawl space are foam insulated. Nothing on the celing. I asked the builder why no insulation on the ceiling and he said its a conditioned space and doesnt get insulated . Its very cold in the crawl space and seems to be the obvious cause of the cold room . Ive researched but couldnt find a clear answer. Should it have been insulated by the builder?

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