How to Lift a Sinking Deck


There are a number of potential causes for the drooping that you have seen on your deck, which is an inconvenient problem that you may be asking how to fix. How much does it cost to repair a deck that has started to sink? Homeowners spend an average of $1,891 to fix problems with their decks, according to Bob Vila, although the amount varies depending on the size, material, origin of the issue, and current state of the deck. It is possible that you may additionally need to get a permit if the scale of the work is large.

How to Fix a Deck That Is Sagging in the Middle

According to Period House Guru, drooping decks may be the result of termite damage, uneven terrain, rotting posts, issues with the joists, or decaying posts. Other potential causes include difficulties with the posts. Installing a jack on both sides of the deck’s lowest location beneath each horizontal support beam is one strategy for addressing a deck that has sagged to an uneven level. Use a jack that requires manual cranking, such as the one used for changing tyres, or a joist jack if the deck is too high for them. After that, pump both of the jack handles until your deck is level, and then use a level to ensure that it is in good condition.

After you have jacked up the deck to the appropriate height, you may add temporary supports built from 2x4s to keep the deck in place while you work on it. You’ll also need to construct crossbraces out of 2x4s to provide additional support for the joists. Install them at intervals that are parallel to your joists and at the same distance apart as the other supports and posts. These crossbraces may be fashioned from discarded pieces of lumber, which you probably already have lying around your home.

How to Fix Sagging Deck Joists

Hangers made of metal are often used to fasten the ends of deck joists. These hangers need to be affixed to the deck using strong hanger nails. It is recommended that you repair the joists if they are broken, bent, or drooping in any way. To get started with this replacement, remove the blocking from both sides and remove any nails or screws that are holding it in place. You will need to snap a straight chalk line and cut the boards using a circular saw and a straightedge in order to straighten them.

In addition to this, you will want to inspect the ledger, which is a horizontal board that is directly linked to the house by a metal hanger and serves to bind the ends of the floor joists. Alongside the ledger, there should also be a long piece of metal flashing; if there isn’t one, you should either install one or ensure sure the one that is there is firmly attached to the ledger using carriage bolts, decking screws, or nails. If you have a raised deck, it most certainly has vertical wood pillars that are resting on concrete piers or in concrete-filled holes. If your deck is not raised, it most likely does not have pillars. These should not be decaying or cracking and should be three times the width of the post they are attached to. Sagging can also be addressed by securing the deck posts to the concrete underneath.

Problems With Posts and Beams

The majority of decks are constructed using huge, horizontal beams that are positioned on top of piers and pillars that serve as support. The floor joists get the principal support that they need from these beams. Unfortuitously, they are vulnerable to water damage as well as fractures, and any of these issues may cause damage to your deck, necessitating its repair. These beams have to be firmly fastened to the wall and they can’t droop in any direction; otherwise, additional supports could be required. A height of at least 12 inches above the ground is required for beams that are built from untreated wood.

On raised decks, you’ll often find long, vertical wooden supports. These pillars should be firmly fastened to the deck frame at the top and the concrete support at the bottom. You may test these supports to see whether they have been damaged by water; the wood shouldn’t be spongy or squishy. If these supports have deteriorated or been damaged in any way, you will need to replace them. In addition to diagonal bracing, other deck footing repair solutions for drooping decks include working with a soil engineer to amend the soil in the event that it has settled, and using diagonal bracing.

2 by 4 boards


Screws!!-!!!!-!!!!-!! Nails

The sound of metal clattering!!-!! Bolts for the carriage!!-!!!!-!! Screws for the deck!!!-!!! Supports for!!-!! on the deck Hand-crank jack or joist jack


Driver for a screwdriver!!-!! Hammer

Chalk line

Circular saw





Chalk line

Circular saw