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Posted by dpb on May 25, 2008, 11:00 am
curt wrote:
...
> The overhang is 25' X 22', supported on 4 posts at the corners and is
> additionally anchored to the adjoining house. The rotted Trilam is 25'
> long and extends perpendicularly from the house. The roof joists all run
> at 16" offsets parallel to the house and are sitting in metal joist
> hangars. The carport sits 13' 6" off of the ground.
>
> I am planning on using some sort of beam supported by adjustable steel
> columns which can jack up the carport and hold all ceiling joists in
> place while we remove the rotted Trilam and replace it. Is there
> anything we should watch out for when doing it this way? Is there a
> better way to do it?
...
I'd suggest a couple (or even three) shorter temporary beams (4x4 w/
supports at 4-6 ft should be adequate (if it's only a carport roof it
isn't that much weight). Working from one end to the other w/ a helper,
set a column and w/ a jack raise to proper height, then block and move
down. For ease in handling overhead, I usually will make a temporary
hanger to support the beam overhead as simple as a spike and wire so
don't have to muscle it up while starting the raising process. Then
wedge in place using shims for final adjustments if needed and add a
cleat to hold in place.
Depending on availability, I use poles cut to appropriate length or old
used pipe or drill stem (but it's easily obtained as scrap here) --
where you're located will have a lot to do w/ what is a suitable and
easily obtainable useful column material that is also not terribly
expensive. Ideally, one would use cribbage and build solid supports so
the lever arm isn't long if one were really jacking, but if it's in
place and you're only using the columns as support or minimal raising
back, it should be fine to use columns, especially if limit the size of
the individual beams rather than trying to have one full length of the span.
Just be smart (as in cautious) in how you approach it--something as
light as a carport roof isn't much of a lift really despite looking
somewhat daunting if you've not done such before...
--
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