"Bob F" wrote in message
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"Cubby" wrote in message
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Hiya Folks,
I need to raise up the roof of a porch a bit to get old columns out and
new ones in. I was hoping to use the type of jacks I see (and used ages
ago) on concrete pours to plumb up the forms. Basically was thinking of
attaching a 4x4 to each end of the jack and then be able to turn the
turnscrew in the center to raise and lower the roof. First question:
What are these called? 2nd: Can I do this or am I asking for trouble?
Next, if these are not recommended for use, then I suspect I'll be
heading the bottle jack route which is fine but I'll
have to do each one individually as I don't have 4 bottle jacks (number
of colums to be removed). Thanks for any inputs.
Cheers,

I just layed a 4x4 on the deck, across the joists, another at the top, and
another between the top one and the lifting part of an automotive floor
jack laying on the bottom one. You can prop it with more 4x4s after you
get it lifted.



Thanks. I may be able to use this idea as well. I have to demo the deck
but perhaps I can do this from the ground up.
Cheers,
cc