mike,
i was against the method used, but since i'm just an employee it was not my call. because the part of the tree that was standing is in such bad shape my boss was afraid of pulling down the rest of the tree. also to avoid any possible liability issues he didn't want us to climb the tree to set a pulley. typiclly we would set a pulley up high in the tree, set the rope high a few feet back from the gutter and pull it up off the roof, then cut piece's off the bottom.
when my boss got the go ahead from the ins co told them we would damage the gutter and possibly the eve. the roof was already trashed. so since the ins co is already paying to reroof a terra cotta roof a gutter was a drop in the bucket.
i've used the prop up method before, but ithe spar was only hanging by a thread. i would not have worked on the limb till it was on the ground. i cut it free with a power pruner
. the prop methed i;ve used more in up rooted tree's where i don't have to worry about any drop and i know it's still semi attached to the ground.
if i propped this tree then i would have had to go up on the spar to take it down. the piece's would have had to been roped since it was over a slate walkway and close to the windows. the shock of roping it off itself could have snapped it free. when we were cutting the bush off the roof as the weight changed it twisted and almost broke free then.
but i'm still interested to hear other ideas. has any one ever set up scaffoling uder a tree?