by Cashmere » Tue 06 May 2008, 08:28:06
Kpeavy - real asshole answer.
Trial and error. Seriously man, why bother to take the time to type those words? Who the hell wants to spend a bunch of time on something just to rip it out?
I have no issue with a 12' pole as long as you have some way of getting to the line. For example, if you had the other end at 5' or on the house or on a porch.
My last pole was at about 6 feet, which, depending on the length of the line, can be too low. Hang several wet sheets on that line in the middle and you've got enough sag so that the sheets are scraping the ground.
In any case, treated wood 4x4 buried 4 feet, regardless of what's sticking out, is probably fine for a basic line. No concrete needed. Use an auger on a tractor or a post hole digger. Disturb as little dirt as possible. Use a wedge/tamp to set earth around the 4x4. That's important - if you just throw the 4x4 back in the hole and back fill with your foot and shovel, the pole will be leaning as soon as you put lateral pressure in it. Use a wedge tamp to drive dirt down all around the pole, especially in the top 2' of the hole. You may want to have the pole be listing slightly away from the line to "pretension" it.
If you want it to stay close to vertical, then setting it in concrete will do the trick for sure.
Do it once, forget about it.
Negatives are - a lot more work - more money - difficult to remove and discard if you don't want it in your yard.
If you do choose to use concrete, make sure the top of the concrete sticks above the ground a few inches, and make sure that you taper the top away from the wood - I'd seal it as well so no water could get in between the wood and the concrete. Use one of those cylindrical forms from Home Cheapo or bLowes to get smooth sides and prevent heaving. 4' would be great. 3' would probably work ok.
do it that way, and throw some water seal on the wood every few years, and that pole will be there after we're gone.
I don't like using metal for stuff like that because it always rots - it's just a matter of time.
For the line, I think the best stuff is the plastic encased wire - maybe 10 gauge braided with plastic around it. I've had some of that up for many years.
Rope will sag, collect debris, and so on.
If you go with rope, go with the polyester braided stuff - cotton rope will rot fairly quickly.
Good luck.