If the driving force of air infiltration and stack affects is the weight pressure of that denser cold air outside the house pushing in and lifting the warm air inside (once again, warm air doesn't really have any force of it's own to rise, it's pushed up by heavier cold air). That pressure difference outside should be higher than the warm air pressure inside at the top of the house, thus "plugging" the force pushing warm air out ?????????????
If so, then is the stack affect in a house driven more by cold air infiltration ,or by warm air losing heat that is not leaking out in streams, but being lost by radiating through glass, walls and ceilings, then becoming heavier as it cools down and condenses and sinking to replace warm air from below ?
Then the stove and chimney are all that needs make-up air, right ?
Chicken or the egg ?