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Lifting porch roof to r&r columns Cubby 07-10-2008
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Posted by Cubby on July 10, 2008, 11:06 pm
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,
cc



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Posted by Robert Neville on July 10, 2008, 11:22 pm


>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.

Lally Column?

http://www.hammerzone.com/archives/framecarp/supplement/floor/joist1/raising.htm


Posted by RicodJour on July 10, 2008, 11:48 pm
> >I need to raise up the roof of a porch a bit to get old columns out and =
new
> >ones in. =A0 I was hoping to use the type of jacks I see (and used ages =
ago)
> >on concrete pours to plumb up the forms. =A0 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. =A0 First question:
> >What are these called? =A02nd: =A0 Can I do this or am I asking for trou=
ble?
> >Next, if these are not recommended for use, then I suspect I'll be headi=
ng
> >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). =A0 Thanks for any inputs.
>
> Lally Column?
>
> http://www.hammerzone.com/archives/framecarp/supplement/floor/joist1/...

That's not a Lally column. Lally is a trademarked name, and the one
in that article is a post jack (generic term), which is different than
a Lally column. You did point the guy in the right direction, though.

The OP can use a hydraulic bottle jack, a car scissor jack, a post
jack, a railroad jack or simply use a 4x4 at an angle and some
wedges. A porch roof doesn't have much weight, and each jacking point
would probably be bearing a few hundred pounds or so - probably
wouldn't be as high as a quarter ton.

I Googled this:
jacking up a porch roof to replace a column

and came up with this as the very first link:
http://www.hammerzone.com/archives/framecarp/repair/porch/beam13/replace.ht=
m

R

Posted by Cubby on July 11, 2008, 8:31 pm


That's not a Lally column. Lally is a trademarked name, and the one
in that article is a post jack (generic term), which is different than
a Lally column. You did point the guy in the right direction, though.

The OP can use a hydraulic bottle jack, a car scissor jack, a post
jack, a railroad jack or simply use a 4x4 at an angle and some
wedges. A porch roof doesn't have much weight, and each jacking point
would probably be bearing a few hundred pounds or so - probably
wouldn't be as high as a quarter ton.

I Googled this:
jacking up a porch roof to replace a column

and came up with this as the very first link:
http://www.hammerzone.com/archives/framecarp/repair/porch/beam13/replace.htm

R

Yup, saw that one before I posted. They use a bottle jack. I was hoping
to avoid buying 4-5 bottle jacks to do this. I have to lift the entire
roof (approx. 24') at the same time and leave it there
long enough to dig new footings, pour concrete, and install new posts.
This is also 150 miles from my home so chances are of me getting all of this
done in a weekend is slim so I want something that I can
put in place and not worry about it lowering the roof (ie. I worry about
that with bottle jacks).
Cheers,
cc



Posted by Bob F on July 14, 2008, 6:13 pm

>
>
> That's not a Lally column. Lally is a trademarked name, and the one
> in that article is a post jack (generic term), which is different than
> a Lally column. You did point the guy in the right direction, though.
>
> The OP can use a hydraulic bottle jack, a car scissor jack, a post
> jack, a railroad jack or simply use a 4x4 at an angle and some
> wedges. A porch roof doesn't have much weight, and each jacking point
> would probably be bearing a few hundred pounds or so - probably
> wouldn't be as high as a quarter ton.
>
> I Googled this:
> jacking up a porch roof to replace a column
>
> and came up with this as the very first link:
> http://www.hammerzone.com/archives/framecarp/repair/porch/beam13/replace.htm
>
> R
>
> Yup, saw that one before I posted. They use a bottle jack. I was hoping to
> avoid buying 4-5 bottle jacks to do this. I have to lift the entire roof
> (approx. 24') at the same time and leave it there
> long enough to dig new footings, pour concrete, and install new posts. This is
> also 150 miles from my home so chances are of me getting all of this done in a
> weekend is slim so I want something that I can
> put in place and not worry about it lowering the roof (ie. I worry about that
> with bottle jacks).
> Cheers,

Jack it up, insert 4x4s, and lower it on them.



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