Breatheing walls and foil insulation

[kbs2244]

These 2 things seem to generate a lot of questions and debate.
I found these sites that have expert advise on how and why you want to do what

Dry walls

https://www.protradecraft.com/walls-can-breathe-are-walls-can-dry


Foil install for and heat and moisture control

https://www.protradecraft.com/radiant-barriers-7-minutes-bs—building-science-wa-beat