Malcolm Hoar wrote:
In article , "Edwin Pawlowski" wrote:

"Malcolm Hoar" wrote in message

3. And most of all, because the outside walls are subject
to the wind chill effect. More heat loss. The floor is
insulated by the dirt and rock -- quite a few feet of
it too ;-)

But the earth is cooler than the inside air. As long as it is cooler, is not
Insulated, it is drawing heat. Insulation helps.


Sure, more is always better. Insulatio ad absurdum.


Energy efficient homes are built with 1" or 2" of insulation under the slab.


But the OP doesn't have a slab.

Besides, what is 1" or 2" of insulation under a slab? It's
effectively 1" or 2" of air.

The OP already has that and more.


I agree that other places have much more heat loss, but over time, loss is
loss and if you can stop it you save money.


It generally costs money to insulate and some of those
investments can pay for themselves very quickly. Others
never recoup the initial cost.

And if inappropriately installed insulation creates or
contributes to moisture problems, rot and mold one has
a highly negative return.


Don't just take my word for it.

http://www.hgtvpro.com/hpro/bp_insul...150_3463250,00.
html

http://www.buildingscience.com/resou...our_basement.p
df

https://www03.cmhc-schl.gc.ca/b2c/b2...1EN&areaID=000
0000042&productID=00000000420000000051


Since the OP doesn't have a basement or a slab I'm not
sure what point these links are trying to make.


Don't listen to these people, insulate.

As far as venting etc, you are chinging things from what they were over
the last 150 years, so things will change....

If you are worried about moisture etc, use foam.