Posted by Andy Martin on January 02, 2016 at 19:43:06 from (209.213.149.120):
In Reply to: Lowering a roof posted by notjustair on January 02, 2016 at 19:18:18:
A Scaffolding will hold a lot of load. You could build four towers out of scaffolding to safely support the four corners and support the roof while you replace the poles or build walls and not lower the roof. X brace between the four towers with cable and come-a-longs and you have a very stable structure. Scaffolding rents pretty cheaply by the month.
B To lower the roof you would need to come up with a jacking system to lower the roof controlled. One method is to build the walls you want with the scaffolding A above holding the roof. Then hire a crane for one day and lift the roof slightly while you remove scaffolding and let the roof down to the wall height.
C Without bringing in a crane, you can collect a lot of cribbing enough to crib all four corners the height of you scaffold sections. After you support the roof with scaffolding and get the poles out of the way, crib all the way from beams across the next lower scaffold section, then jack up 1/4 inch, remove one layer of cribbing, lower to the next lower level of cribbing and so on. Requires jacks that will travel al little more than your cribbing. 4x4 cribbing with 5 inch stroke jacks lets you walk it down four inches at a time. Takes a while but requires no expensive lifting equipment and the roof supported on four corners with 5 ft by 8 ft scaffold towers is stable.
D Set up six poles outside the roof, higher than the roof, with beams running under the roof to support the roof. X-brace the poles below the level you want to lower the roof to. Set up winches, or chainfalls on each pole to support the ends of the beams, like house movers. Lift the beams slightly, cut out old poles, install new poles or walls, then lower the chainfalls to let the roof down. Poles will hold against wind one direction, and x-bracing will hold against the other direction.
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