Answer: There are a
couple of ways you can raise and replace the deck posts. One way is to use a
jack designed for home construction projects. In addition, you will need
Take two of the 2”x4”s and nail
them together such that the end side of one butts up against the flat side
of the other to form a T. Repeat the process with another pair of 2x4s.
Next, temporarily install a
section of 2”x4” across 3 of the deck floor joists near the area where the
post to be replaced resides. Use a couple of screws to hold it in place.
Next place a section,
approximately 3-4 feet in length, of either a 2”x 6” or 2”x 8” on the
ground. Make sure the section of material is level and on solid footing. The
jack will rest on this surface.
Next place one of the
T-formed 2”x4” pieces up underneath the 2”x4” that is nailed to the
floor joists. Preferably locate the top of the T-formed 2”x4” under the
middle floor joist area that the attached 2x4 section runs across.
Toe-nail in the top of the T-formed 2”x4” to the section of 2”x4”
connected to the floor joists. This will prevent the T-formed section
from slipping out when it is under load.
Now place the jack underneath
the T-formed 2”x4”. The jack should be resting on the 2”x6”/2”x8”.
Note: You may need another small block of flat surface material to sit
between the bottom of the T-formed 2”x4”s and the jack itself. You may also
need to trim the T-formed 2”x4” to length to allow the jack to be positioned
Next, make sure the deck post is
free to lift from the concrete base that it sits on.
Turn the jack-screw to raise the
deck up. You will only need to raise the deck up about a half inch to have
clearance to remove and replace the old deck post.
Once you have the deck raised,
place the other 2”x4” T-formed-piece between the 2”x4”-section attached to
the floor joists and the 2”x6”/2”x8” that is lying on the ground. You will
probably need to cut this to length. The purpose of this T-formed piece is
to add some safety to the project.
With the post off the ground you
can simply remove it from the deck and replace it with the new 6”x6” post.
An alternative to a Jack
If you do not have access to a
jack, you can alternatively use a couple of 2x4s to create an inverted V to
lift the deck.
In this situation, toe nail two
2”x4”s to the section of 2”x4” that is attached to the deck joists. The
2”x4”s should rest on the 2”x6”/2”x8” piece on the ground, however they must
be of length that they form an inverted V.
Using a sledge hammer, wedge the
two 2”x4”s together to form a tighter V. This will raise the deck. Once the
deck is raised, attach a couple of small blocks of wood (using 16-penny
nails) to the 2”x6”/2”x8” on the ground so that they butt up against the
outside edges of the two vertical 2”x4”s. This will prevent them from
Finally, place a 2”x4”
T-formed-piece between the 2”x4”-section attached to the floor joists and
the 2x6/2x8 that is lying on the ground for added safety.
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