I’m remodeling a house that has two exposed 6x12 glulam beams that extend from the open-plan living space into an attached sunroom, which cools to near the outdoor temperature at night. Is there a good way to eliminate conductive heat loss through the exposed beams?

A. Steve Baczek, an architect in Scituate, Mass., responds: There are several ways to deal with the problem directly. For instance, you could insulate the beam on the inside to minimize its ability to take on heat from the indoor air, then box it in with some sort of finish material. That will reduce heat loss, though some or all of glulam’s top...

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