On 9 Oct 2006 13:02:23 -0700, "Heathcliff"
wrote:

Thinking about adding insulation to the attic, which is floored over.
The easiest thing would be to put insulation on top of the flooring.
However, I need part of the space up there for storage. If, say, I put
insulation all around except for an area in the middle, would that
eliminate most of the gains of insulation? In other words, if I leave
20% of the space uninsulated, do I cut heat loss by 80% (of what I
would by insulating all over)? -- H


The floor itself offers some insulation. The insulation property is a
factor of material, coverage area, and thickness. You could add a
thick underlayment and carpet to the floor. Often you can find used
carpeting and underlayment for free.