[Antennas] Need good idea for chimney mount.

Tue, 14 Oct 2003 17:23:56 -0500

Right on, Jim.

I spent 8 years as a firefighter, and know from experience just how fragile
chimneys really are.  I've seen houses burn to the ground, with the chimney
still standing.  On the other hand, I've seen a minor fire in a room not
even next to the wall with the chimney weaken the supports enough that the
entire chimney overbalanced and came crashing through the rest of the house
(taking out a good section of it in the process).

One of the first things we checked before working on a roof over a fire is
if the chimney is swaying.  And you'd be surprised how many do!

Jay
AD5PE
----- Original Message ----- 
From: "FireBrick" <[email protected]>
To: "Jim Isbell" <[email protected]>; "Antenna List"
<[email protected]>
Sent: Monday, October 13, 2003 6:02 PM
Subject: Re: [Antennas] Need good idea for chimney mount.

> I'm a retired licensed Chicago mason contractor.
>
> A lot depends on the use of the chimney.
> (A Service Chimney is one that exhausts the hot gases of a furnace and or
> water heater. It usually has a 8 or 10" round hard fired clay pipe
sticking
> up out of the top of the chimney.)
> (A Fireplace Chimney is for a wood or gaslog burning fireplace. It usually
> has a rectangular clay flue liner sticking up out of the top of the
chimney)
>
> A service chimney or fireplace is usually about ~21" square.
> Both types of chimneys can be incorporated into a single unit, in which it
> is approx. 60" X 21" or more if the house requires even more fireplaces or
> furnaces.
>
> A single service chimney should not be used to support anything bigger
than
> a TV antenna.
>
> I made money repairing me, trust me on this...
>
>
> PS. A gas log fireplace will exhaust corrosive gases also. Just not in the
> same quantity as a gas burning furnace. If unused and even with the damper
> closed, warm air will still escape the chimney and could condense and
freeze
> on a rotor that is above the flue.
>
> A wood burning fireplace will exhaust tar and soot that will coat anything
> above the flue with a greasy dark messy uncleanable creosote.
>
> I made money cleaning this, trust me on this...
>
>
> ----- Original Message ----- 
> From: "Jim Isbell" <[email protected]>
> To: <[email protected]>
> Cc: <[email protected]>
> Sent: Monday, October 13, 2003 5:41 PM
> Subject: Re: [Antennas] Need good idea for chimney mount.
>
>
> > Well, we dont use the fireplace.  It doesn't get that cold here. So
> > chimney gases are not a concern.   As to the wind load, a 3 band spider
> > beam weighs less than 20 lb. and can be turned by a standard TV antenna
> > rotor so the wind load is negligible.  The reason I went for a spider
> > beam is because we have a hurricane or two here almost every year.  The
> > chimney is exceedingly strong and I think the pole would bend in the
> > middle before anything on the chimney was even stressed.
> >
> > [email protected] wrote:
> >
> > >I strongly  recommend against mounting anything on a chimney.
> > >
> > >1. Its not good for the chimeny to have any substantial wind moments on
> it.
> > >
> > >2.  Ever notice what happens to metals subjected to the corrosive
action
> of
> > >chimney flue gasses after just a few months?...it will damage  your
> antenna's
> > > support,  feedline  and the antenna itself.
> > >
> > >Bob
> > >
> > >
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