I can not answer that question for you but would think you would
want the heat gain we want to reject.
The air space may be the same answer as the tar paper. Here, any
rejection of heat gain is a gain for us.
Our home energy dollars are spent on cooling not heating.
You have to deal with ground heaving from frost, most of us, ocassionaly
have to scrape frost from our car windows, if we leave them outside
overnight. You bury your home water pipes deep under ground, sometimes we have
to wrap a wash rag around our spigots to prevent freeze damage. Here if the
temperature drops to 32F you would think we were under attack, they ask us not
to drive and to stay home and not go to work.
So I do not know if it is conflicting information or just information
adjusted for different climates.
Clark
I've
been getting conflicting information re radiant barriers. Are they useful in
cold climates (VT/NH). At the moment it seems as if it is not cost-effective.
Need
to have at air space (3 inches is most common
recommendation) between itself and warm air space wall/ceiling. Then pile
on insulation. It is difficult to retrofit a house with these specs,
and not cost-effective.
--
gilbert midonnet
