This is because concrete over 4000psi is supposed to be waterproof. Low
grade concrete will wick water, but the higher grades will not. Bridge
supports don't wick water, and they are concrete. Either bury the post
deeper than normal, or set it in high psi concrete. It will probably be
eaten by a critter before it rots. By the way, .60 treated southern
yellow pine should be much better than redwood. Its what they use to
build wood foundations which are burried for life.
On Wed, 27 Oct 2004 08:27:39 -0500 "Keith Dutson"
<kjdutson@earthlink.net> writes:
> My barn is built on 4X6 20-foot Wolmanized pine posts set in concrete
> to a
> depth of 4 feet. It was erected in 1977. There is no evidence of
> rot.
>
> Keith NM5G
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Tim Makins,
> EI8IC
> Sent: Wednesday, October 27, 2004 1:31 AM
> To: TowerTalk
> Subject: Re: [TowerTalk] Mounting a 4x4 in concrete
>
> I think setting timber in concrete is a bad idea. Water can get in
> around
> the timber and cause rot. Why not set a length of steel I-beam or
> similar
> into the concrete, and bolt the timber to that ?
>
> 73s Tim EI8IC
> www.mapability.com/ei8ic/
> Ham Map Heaven. Newbie and Contester Resources. APRS stuff.
>
> ----- Original Message -----
> From: "Derek Cohn/WB0TUA" <vibroplex@mindspring.com>
> To: <towertalk@contesting.com>
> Sent: Wednesday, October 27, 2004 5:45 AM
> Subject: [TowerTalk] Mounting a 4x4 in concrete
>
>
> Dear All,
>
> I'm trying to elevate my very low dipole that is fed with balanced
> line.
> I'm trying to go with a non-metallic support so the balanced line
> does not
> interact. My dipole is currently 18' in the air.
>
> I recently purchased a 22' fiberglass mast from The Mast Co. This
> is their
> heavy duty windsock pole. I'm planning on mounting it to a 20'
> redwood 4x4
> with the Kwik-Block mounting blocks they also sold me. I plan to
> set the 4
> x4 in concrete.
>
> I checked around and one of the local deck builders says I need to
> put about
> 4' of the redwood 4x4 into the concrete. That would reduce my
> effective
> height of the 4x4 to 16'. If I overlap the fiberglass mast a foot
> or two, I
> have 16' + 20' = 36' which is roughly double the height I have now.
>
> What do you guys think about the 4' of 4x4 into the ground. Too
> much, too
> little, just right? I noticed that you can put l-bolts into the
> concrete
> footer and mount a u-shaped bracket on top of the footer that will
> accept
> the 4x4. This is advertised for deck applications and I think it
> wouldn't
> support 20 feet of 4x4. However, it would give me four more feet of
> height
> if it could be made to work. Has anyone tried this?
>
> 73,
>
> Derek Cohn
> Morse Telegraph Club - Alton Chapter
> Telegraph Office UD, sine DJ
> Amateur Radio Station - WB0TUA
> 1969 M274A5 Mechanical Mule
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers",
> "Wireless
> Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041
> with any
> questions and ask for Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers",
> "Wireless
> Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041
> with any
> questions and ask for Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers",
> "Wireless Weather Stations", and lot's more. Call Toll Free,
> 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
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_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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