Sent: Thursday, January 03, 2002 12:23
PM
Subject: Re: [GBlist] tar-paper for
roofing
When the sheathing is applied to the roof the shiny side faces down.
The difference in price between standard sheathing and the sheathing with
the foil already applied is only around five dollars per 4X8 sheet. It may
be slightly more temperature efficient to apply a radiant barrier on the
underside of the rafters when new but after a short time it is coated by
dust and would not be advantageous. The labor cost on the other hand would
cause people to just leave it out of construction all together.
The temperature difference in an attic here in South Texas utilizing
this type of product vs. one that does not is amazing.
The greatest amount of heat gain is through the roof making this
product cost and actually effective, reduces the demand for
electricity, and most important, saleable to people building a home
that would not consider green building products. Until a green building
product is in use, it isn't actually a green building product.
So the answer to the question is, no, it still works. Although it would
work better with one, if you can keep the radiant
barrier clean.
Doesn't there need to be an air space between
the radiant barrier and the tar paper for the radiant barrier to
work?
Bob
Jordan
