Step 1 access the area under the deck.
How to lift or jack up sunken floor joists.
After they were in place we hoisted up the 4 x6 x8 beam so that it crossed all four of the new joists sliding the screw jacks underneath.
Get the jacks under the floor.
Once the new joists were up we found locations where the concrete blocks could sit flat on the ground so the pressure wouldn t cause them to crack.
Jacking up the deck and shimming the post can resolve deck sag problems.
You cannot jack up a house in one day.
It has to be jacked up slowly over days or even weeks to avoid cracking drywall plaster windows and even structural elements.
Anything involving 20 ton house jacks will take time.
Raise the jack so it contacts the wooden floor joist supporting the decking.
Jack up that portion of the house and place new footers.
Continue raising the jack until the deck is no longer.