Steve O'Hara-Smith wrote:
On Thu, 14 Aug 2008 12:51:02 GMT
[email protected] (Robert Scott) wrote:

There is something disturbing about making something that gives you
an incentive to continue to have poor attic ventilation, or even to
make your attic ventilation worse in order to raise the efficiency
of the water heating system.

Why ? What's so good about ventilating an attic rather than
using it as a heat trap.

Well, for one thing heat is the enemy of shingles--if you don't have
proper ventilation and are in a hot climate they'll very likely fail
prematurely.

Then there's elimination of moisture--without adequate ventilation you
can get enough moisture buildup in the attic to result in mold on the
structure, and where there is mold there is shortly after rot.

Then there are ice dams in winter.

There's a reason that every new roof that goes on in most of the US
has a ridge vent, and the reason is not that it looks snarfy or makes
big profits for the roofer.

That is like a government basing its budget on
having a tax on prostitution.

Everywhere prostitution is legal it is taxed just like any other
income. I don't think it's a substantial part of any governments
income though.

--
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)