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Extending Fence Posts

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Extending Fence Posts ianjones 10-11-2006
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Posted by Heathcliff on October 12, 2006, 6:40 pm



ianjones wrote:
> This is a duplicate from alt.home.lawn.garden - I did not know the best
> place to post it.
>
> I am replacing the panels on my fence because of rot and lack of
> integrity (1 x 3 cross pieces). It is currently 4' tall and I am
> installing 6' panels. The posts are cemented in and in good shape - I
> would like to keep them. They are on 8' centers. What would be the best
> method for adding 2'+ to the posts? I was thinking I could toe nail
> (least desirable) but I could also use some square metal brackets on 2
> sides (not bad) or several wood dowels (time consuming - there are 45
> posts). I think the best and cleanest install would be to use (if it
> exists) a screw that is threaded on both ends. With a couple pilot
> holes I could screw into the extension and then twist the whole unit
> onto the existing post. The panels have 3 cross pieces and since 1
> would fall on the extended piece it should keep it from ever twisting.
>
> My question is what would be the best option as far as stability, ease
> of installation and aesthetics (in that order I think). If my screw
> option is the best - do those exist and what would they be called? Does
> anyone have a online resource for that stuff? Are they made big enough?
>
> Thanks!
> Ian

Another way would be to join the existing post and the extension piece
with a lap joint. Like so:

| |
| |
| _|
|_|
_
_| |
| |
| |
| |

Using glue and screws or bolts. Might be better looking than the
mending plates.. -- H


Posted by David Nebenzahl on October 13, 2006, 2:17 pm


ianjones spake thus:

> ... I think the best and cleanest install would be to use (if it
> exists) a screw that is threaded on both ends. With a couple pilot
> holes I could screw into the extension and then twist the whole unit
> onto the existing post.

Such things do exist; they're called dowel screws, basically a
double-headed wood screw.

But keep in mind that this would be the weakest possible way to do it,
since screws don't hold well in end grain, which is where they'd go in
this case. Dowels would be better, but, as you point out, a pain in the
butt if you have 45 posts to extend. Plus they'd have to go pretty deep
into both ends.


--
Save the Planet
Kill Yourself

- motto of the Church of Euthanasia (http://www.churchofeuthanasia.org/)

Posted by Goedjn on October 13, 2006, 3:40 pm


On Fri, 13 Oct 2006 11:17:35 -0700, David Nebenzahl

>ianjones spake thus:
>
>> ... I think the best and cleanest install would be to use (if it
>> exists) a screw that is threaded on both ends. With a couple pilot
>> holes I could screw into the extension and then twist the whole unit
>> onto the existing post.
>
>Such things do exist; they're called dowel screws, basically a
>double-headed wood screw.
>
>But keep in mind that this would be the weakest possible way to do it,
>since screws don't hold well in end grain, which is where they'd go in
>this case. Dowels would be better, but, as you point out, a pain in the
>butt if you have 45 posts to extend. Plus they'd have to go pretty deep
>into both ends.


If you're going to extend a stick, you use the joints that are
designed for extending sticks. Generally, you'd use
a half-lap, a finger-joint, or a variant of a scarf joint.
Of those, a half-lap would be easiest, and if you set it
perpendicular rather than parallel to the fenceline,
the weakness will be in a direction that shouldn't
get much stress.

Alternatively, you could use decorative (or plain)
metal straps or collars, but that can get expensive
fast.






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