The u value is a measure of how much heat is lost through a given thickness of a particular material but includes the three major ways in which heat loss occurs conduction convection and radiation.
R19 vs r30 attic.
Don t stuff r 30 into a space that just fits r 19 5 1 2 because you will lose efficiently if you do.
The bigger the r value the better the insulation is at slowing down the heat transfer.
Over the ajoined rooms is a vaulted ceiling.
That said use as much as you can.
We now know what r value is but how does this compare to u value.
Drill holes in the sheathing and blow insulation into the empty wall.
What you want to do is fill the space between the framing members.
So r19 is better insulation than r13 and r30 is better than r19.
In florida 2 000 sq ft ceiling r19 to r30 reduces btus by 2 002 btus with r4 duct in the attic.
I ve been renovating parts of my home over the last year and am finally rounding third base on my kitchen dining room.