In part 2 of this insulation introduction, I discuss the main types of insulation used for ceilings, floors and wall.

For more information about insulation materials, check out Level.org.nz from BRANZ:

http://www.level.org.nz/fileadmin/downloads/Materials/LevelMInsul.pdf

For more on the properties of wool, including great microscopic imagery, check out:

http://www.biotechlearn.org.nz/focus_stories/wool_innovations/wool_fibre_properties

and

http://en.wikipedia.org/wiki/Wool_insulation