Actually, the R value for the board I wanted to use, is about 7.2 per inch,
3.6 per 1/2".
I decided to use a felt paper instead of Tyvek. Installing it right is the
key
Thanks for all replies.
Luke
"Tom The Great" wrote in message
...
On Mon, 04 Sep 2006 02:00:25 GMT, "LM" wrote:

I'm replacing my siding and find lots of gaps in the fiberglass inulation
(in-wall). I am thinking of adding foam boards to the exterior walls to
better seal them and add little insulation. Going by R-value, this doesn't
add much (1/2" R4) but maybe this would protect better against winds etc.
I
am installing hardie plank siding. Will this home 'breath' ?
ventilation? Anyone has experience with this type of insulation?

Luke



R value sounds a little high for 1/2", but reguardless these R values
are under 'ideal' conditions. Meaning as you pound down the nails,
the insulation becomes damage. It does seem to help ensure your
building envelope is increased. If you really want to reduce windy
effects, might want to take the time to use a properly installed house
wrap.

I heard on one DIY show, drafts account for the majority of heat loss
in a home, followed closely by poor insulation.

Do your self a favor and take this time to get some professional
advice. The cost of fuel is ever increasing, and a few bucks to a
professional energy advisor might help in the long run.

Also, follow up with what you did, atleast I'm curious the end result.

imho,

tom @ www.FreelancingProjects.com