How do you stop air leaks in an old 1950's house?

Don Fraser
Updated: Sept. 8, 2021

My daughter owns an early 1950's 1 1/2  story house.  What do you recommend be done to reduce air loss  throughout the house. The subflooring laying on the joists are diagonally laid planks rather than plywood ( Assume plywood was not used at that time) which results in gaps between the planks  at the perimeter of the main floor and under all walls, and under the half walls under the roof. My understanding is that air and resulting heat loss is a major problem in this design of house.

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