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Attic insulation options

jpcjguy | Posted in General Questions on

Hi all,

This is about my primary house attic space. At some point I am going to finish half of it off. Here is a pic of the space:

Basically when you get to the top of the stairs, what is in front of you is what will be finished. Where the HVAC is located will be left “attic storage”. This will give me roughly a 20×20 space.
So if I go to insulate this “room” should I just insulate the room itself when it is framed out? Or should I insulate the entire roof and have all of it insulated?
The 2nd floor hvac is brand new and not spec’d for the addition square footage. I was also advised to get a small minisplit system for the third floor otherwise the 2nd and 3rd floor will fight each other in maintaining temps….

The rafters are 2x8s and here is the knee wall setup:

https://lh4.googleusercontent.com/-9Fbi0jCZc-Q/VFJtdc81lQI/AAAAAAAABrw/vkUFMvUXCT4/w532-h709-no/kneewall.jpg

and the current insulation:

https://lh5.googleusercontent.com/-EweZFK89h_U/VFJuFtIlL-I/AAAAAAAABsQ/42pjMRpxHZo/w532-h709-no/attic_insulation.jpg

This project is a ways off, but I figure if the advice is to insulate to the peak across the whole attic, I can do that at my leisure and as money is available.

Thanks,
Joe

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