The 4 ton jack that came with my ford transit van was more than sufficient to raise the porch a couple of inches.
How to jack up a porch roof.
Stand a post up in the bracket and hold a level on its side.
Using a scrap piece of durock cement board i cranked the jack up to give it pressure enough to hold it in place.
Raise the sagging side back up where it belongs and you ll be able to install equal length posts.
If that is the case don t bring the high side down like you did with the deck.
Position a mounting bracket at one of the marks on the bottom of the porch.
Measure from the porch beam to the jack and cut the 4 4 to just under this length.
Once it is plumb mark the position on the porch roof.
Bird mouth the top cut and dig a small kicker in at the bottom of course i ll usually have post jacks in place somewhere so i can slightly jack up the roof to release the column.
1 or 3 of a porch rework more buil.
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Put your level on the porch roof beam parallel to the front of the porch and that is probably what you ll find happened.
Check to make sure the porch beam is level by raising or lowering the jack.
Position the post and use the jack to raise the porch beam slightly until the old column can be removed.
I set it about a foot out from the house as not to interfere with where i needed to work on the column.
Using 8 x 8 x 8 half cinder blocks i build a column to support the jack i would use to raise the porch.
Fortunately the adjustment i needed to make was a common size.
With this initially setup i was able to get about 7 8.
Install another bracket in this position.
I started by sitting the jack on the porch floor immediately above the porch s skirt board.
In this video i jack up the corner of porch roof so that i can successfully install a section of half round gutter.