Towers

If your eve bracket is well mounted there should be little flex on the 2" collar. You could also slide your 3" sleeve over the collar to further mitigate flex at the threads.

If you do decide to crossbolt through both pipes, keep any through holes well away from the ends of either pipe. I personally would do a single 5/16" crossbolt centered in your overlap, along with at least 2 set bolts to keep movement between the pipes to a minimum.

1 1/2" will fit inside of most 2" sch. 40, but some cheaper pipe may have a large longitudinal weld inside that won't allow 1 1/2" to fit. Just thought I would throw that out there fyi.

Specs say 1 1/2" will fit, but it doesn't always actually fit. The only real way to know if 1 1/2" will fit would be to unscrew your top section and take it down to the supply house and try it. You could also run into problems at the collar. If the pipe was cut on a threader it could be smaller from the cut and you would have to file the end to open it back up.

If it was mine, I'd much rather go to the extra effort to try to use 1 1/2". 95% of the time it will fit.

You could get away with a shorter piece, because it is the 2" that would be the problem.

That should be fine for the imax I have always had mine on a push up pole never any
problems...

Suggestion,

Cut the 2 inch pipe in ground down to 3 ft then slip a 3 inch 20 ft. pipe over that and drill holes and bolt it with large bolts. Then you have the 3 inch base. The 20ft. section will be high enough to attach to the eave of your house for added support.

For 36 ft, you really need 3 sections of pipe slip inside each lower section then bolted for strength and sturdiness. The next two sections can be cut down to reduce the overall weight of the mast while the remaining pipe length will be slipped inside the lower section for strength and support or better still, get 10 ft pipe. Telescope the next 2 section 8 ft. each until you get 36 ft.

2 sections will support your antenna but it's most likely to lean and for visual appearance in your neighborhood, you want it to stand up straight.

Troubleshooter said:

... I have a 10 foot 2" pipe 4 feet in the ground in 11 bags of concrete with rebarb and another 10 foot 2" pipe screwed into that with the pipe threads only, then bracketed to the house.. Not sure this can be saved in anyway properly at least........

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Well, you could cut the 2" pipe about 3 feet above the concrete,.... then add a 2 1/2 pipe to it,with proper over lapping ( I would slide it all the way down to the concrete) and pinning.. then continue up with your 2" overlapped section above that.

Heck,depending on how high you are going, you might even consider stubbing a 3" outside the 2 1/2

this will allow you to use you concrete slab and your eave bracket too.

good luck and BE CAREFUL.

Troubleshooter said:

a 3" 20 foot pipe is going to weigh quite a bit,

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True, but this pipe is being supported by the 2 inch pipe in concrete and the eave bracket. You can also cut the 3 inch pipe down and have the middle section supported by the eave bracket and that leaves just the smaller top section freestanding. I believe most houses are 14 ft. at the top of the A frame. I think that would be best.

Just measure the height from the ground to the eave bracket to determine the length of the bottom 2 sections. You still don't want any section fully extended either so calculate a few feet of excess of pipe slipped down into each section. I would use 10 ft for the top section and slip 2 ft in the middle section and bolt it.

Also, You really don't need a 3 inch pipe per se, just one large enough to slip over the 2 inch, then telescope up from there. As you an probably imagine, telescoping smaller diameter pipe into 3 sections is stronger and sturdier than 1 or 2 longer sections. 36 ft may not seem high, but with the weight of the mast and antenna along with wind loading, it's getting close to the point where guy wires might be necessary to keep it straight and sturdy. Over 40 ft and guy wires would most likely be needed.

Just something to think about before you start from scratch again.

1 1/4" pipe will not fit inside 1 1/2" pipe. 1 1/2" tubing will usually fit inside 1 1/2" pipe. 2 1/2" pipe is really hard to find in most cities, and expensive too. This all depends on the size of the seam inside the pipe. Not all pipe is the same, so there are no guarantees