Raise the jack so it contacts the wooden floor joist supporting the decking.
How to lift or jack up sunken floor joists.
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.
You cannot jack up a house in one day.
Jack up that portion of the house and place new footers.
Identify the area of the deck that is sagging and locate the support post that needs to be shimmed.
Get the jacks under the floor.
It has to be jacked up slowly over days or even weeks to avoid cracking drywall plaster windows and even structural elements.
Jacking up the deck and shimming the post can resolve deck sag problems.
Anything involving 20 ton house jacks will take time.
Step 1 access the area under the deck.
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.