[TowerTalk] Nube rebar question

[Bill Aycock]

Jim--
Thanks, I thought that was the case. I have a Rohn (25) tower, mounted in 
almost that way. (Mine uses the "Tilt-Base" version, with 3 bolts for the 
stationary part.
Bill--W4BSG

-----Original Message----- 
From: James Wolf
Sent: Tuesday, December 16, 2014 7:21 PM
To: 'Bill Aycock' ; towertalk at contesting.com
Subject: RE: Nube rebar question

I just googled it and it appears they don't call it a roof mount any more.
Rohn calls it a Concrete Base Plate.  P/N BPC45G.
Mine is slightly different in that it has three holes in it to bolt it to
the roof.

See pages 47 and 64 in their slick sheet for images.
http://www.3starinc.com/manuals/45G_buyers_guide.pdf

Jim - KR9U


-----Original Message-----
From: Bill Aycock [mailto:billaycock at mediacombb.net]
Sent: Tuesday, December 16, 2014 7:59 PM
To: jbwolf at comcast.net; towertalk at contesting.com
Subject: Re: [TowerTalk] : Nube rebar question

Jim-
Your terminology has confused me.  Can you describe what you mean by a "Roof
Mount"?
Thanks--Bill--W4BSG

-----Original Message-----
From: James Wolf
Sent: Tuesday, December 16, 2014 6:17 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] : Nube rebar question

Gentlemen,

I'm baffled that so many of us put part of a tower in the cement base when
installing a guyed tower.
I know I've said it here before, but on most guyed towers, why not use a
simple roof mount?  Put threaded rods in the cement that rise enough to bolt
to the roof mount so it won't turn or twist.

Reasons to consider this:

- No drainage to worry about in the tower section below ground level.
- Weep holes should be or can be made in the roof mount where they can be
easily inspected and cleaned out.
- You are not locked into changing to a different tower later in life -
assuming the cement base will handle it.
- You don't have to worry about getting the tower section in the cement
exactly vertical.
- For those who worry about lightning cracking the base, there would be a
lot less chance of it.  [maybe an old wives tale by now].
- It's probably less expensive.
- It's certainly simpler.

I installed my 120 ft. of Rohn 45 with a roof mount 25 years ago and I've
seen no issues.

Can anyone provide a good reason not use a roof mount for these
installations?   I would be very interested.

Jim - KR9U



___________________

On Tue,12/16/2014 9:27 AM, Kent Olsen wrote:
> What do you do in the bottom where the rebar sits on the dirt? Is this
just a sacrificial bit?

A layer of gravel at the bottom of the hole. If you put the bottom section
of the tower into the concrete pour as many of us do, the layer of gravel is
important for another reason -- it provides drainage for water that comes
down the legs of the tower.


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