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Interesting to see the responses based on the region of the climber. If I read this post outside the pnw, I would reply with only hacks spike non removals as well .
As a C.A. who climbs five days a week, year round it's a blessing if I dont have to climb a doug fir every day. Personally the Doug Fir is the exception to the rule. I have seen four foot firs topped at thirty feet that go on to develop new tops with strong unions on a weekley basis,hundreds of them spiked and all in very healthy condition.
I'm not advocating the use of spurs but I feel it's a very risky aspect of tree work that is unnecessary. I have climbed countless firs only to reach my tip and find it was piece of deadwood the size of a pencil. Many climbers around here spike to the first solid branch send the spikes down, once they are on a known solid tip. I can't be convinced that this is harmful. The bark on 3 plus dbh or fifty year old firs is at least 2 inches thick.
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Good post brushdragon. It's almost a funny thing to tell some customers that using spikes to climb trees is harmful. They say "Well, I've had these dozen or so trees (Douglas-fir, Western redcedar, Bigleaf Maple etc) topped for my view for the last forty years and every company I've ever hired has used spikes. None of them have ever died."
So it's a hard sell to get them to spend more money paying for the same work done in a different way. And to say that a proficient climber can do the work without spikes in the same time is disingenuous. I'm efficient in all methods and I know that spikes are often by far the fastest (and safest) choice.