The two control layers we re concerned about here are.
Air infiltration from attic through ceiling.
This is building science 101.
A form of un controlled attic ventilation will also have an influence on the moisture balance.
Loose connections should be clamped taped and caulked.
During the summer standard ceiling insulation reduces the transfer of heat from the attic to the living space.
In a cold un insulated attic heat conducted through the ceiling warms the air near the attic floor.
In the day temperatures can get up to 140f in the attic.
Any ceiling vents need to be foamed and sealed where they meet the ceiling.
It reduces energy consumption because the temperature in the attic is lower.
Additionally the air tightness of the attic construction itself the un intentional air infiltration i e.
In the day temperatures can get up to 140f in the attic.
The warm air rises toward the roof where it loses its heat.
If you have an attic ac unit you should take this opportunity to check the air seals on the duct work.
During the summer standard ceiling insulation reduces the transfer of heat from the attic to the living space.
Then there are the control layers meant to control the flow of heat air and moisture across the building envelope.
Spray foam also reduces infiltration through the ceiling.
Consider swapping out or upgrading any duct work that is not insulated properly.
It reduces energy consumption because the temperature in the attic is lower.
One source is from outdoors through the attic ventilation and the other is from indoors through air leakage across the ceiling plane.