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[TowerTalk] Routing coax across roof (long)

To: <>
Subject: [TowerTalk] Routing coax across roof (long)
From: (Pete Goudreau)
Date: Thu, 14 Feb 2002 22:28:30 -0600
Jim White, K4OJ wrote:

> can you route the cable through a PVC pipe...gray stuff/UV exposure
> rated?

Thanks, hadn't thought of that either.

> That would be easier to tie down I would think...

Should be, not sure how to do it though.  Going to have to wander 
around Home Depot this weekend and see if there's some kind of 
strapping or whatnot that can go up under shingles for sealing. 
Wouldn't want to start breaking shingles doing it though.  Tough 
problem, this.

Thanks again,
Pete, AD5HD

> K4OJ

> ----- Original Message -----
> From: "Pete Goudreau" <>
> To: <>
> Sent: Wednesday, February 13, 2002 8:34 PM
> Subject: [TowerTalk] Routing coax across roof (long)

>> A question to the list.

>> From a planned antenna installation on a chimney, coax (BuryFlex)
>> needs to be routed roughly 10' along the adjacent sloping roof
>> surface to a ridge where it needs to run about 20' to the gable 
>> where it can run down an unrelated fiberglass mast and then to the
>> ground along with a couple of other feedlines.

>> The problem I'm trying to find a simple solution to is one of
>> protecting the shingles from damage as a free coax run would cause 
>> working back and forth across the shingles in the wind over time.

>> Anchoring the coax seems to be a good solution but with what? And 
>> to do it so the wind won't lift the whole line and damage the
>> shingles or cause a leak?

>> An alternative seems to be to rig sleepers over and along the ridge
>> so that they don't have to be anchored but how to keep the whole
>> thing from lifting in the wind and causing damage anyway? And what
>> would they be made of? Commercial sleepers are PVC but meant to lie
>> flat on a flat roof, not sure it'd be a good choice in this
>> application.

>> Thought about running a cable directly from the lower chimney mount
>> to the fiberglass mast (pretty much a level run) and having it
>> support the feedline, as a catenary, but the tension required is in
>> the hundreds of pound range for a sag of a foot or more. Not sure I
>> want to subject the chimney to any more loading than is necessary 
>> it's a bit of a side load on the fiberglass mast, too.

>> So, I'm pretty much out of options. Is there some commonly 
>> roofing item that makes this an easy thing to do or is there some
>> other way to do this that I'm missing?

>> Running in to the attic space is not an option, I think, as 
there's a
>> gas line for the furnace there and lightning wouldn't be a good
>> thing.

>> This feedline, and the others it meets up with at the fiberglass
>> mast, are to be grounded via Times ground kits, through a Harger 
>> clamp, to a copper clad ground rod where they come to the ground 
>> are then buried around to the master ground bar at the service
>> entrance. This ground rod is part of a lightning ground field as
>> well.

>> Any suggestions, thoughts, pointers, etc., are greatly appreciated.

>> Thanks, Pete Goudreau, AD5HD

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