Repairing Guides

how to repair a sinking deck

by Darby Runolfsson Published 3 years ago Updated 2 years ago
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Reliable Solutions to Fix Your Deck or Addition

  • Steel piers are pressed through unstable soil down to a solid bedrock in strategic areas along the foundation.
  • The piers are attached to the footing with custom high carbon steel brackets designed specifically for each application.
  • Heavy-duty hydraulic jacks are used to raise and level the deck, porch, or patio.

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Full Answer

How do you keep your deck from sinking?

The deck has held up well, except one corner started to sink 4 or 5 years ago. Last year I dug down below the footing, jacked the deck and footing up 2 1/2 inches and placed bricks under the footing. That fix lasted for about 9 months (I checked for level every month).

Will my deck sink if I anchor it to footings?

Likewise, if you anchor a deck to footings that are built on soil that is not properly compacted, your deck will probably sink. Needless to say, this is something you want to avoid. If you suspect your soil is unsettled, you will either have to wait for the yard to settle or dig the footings to a depth where the ground is compact.

How do you fix a sagging deck post?

Jack up the deck, using high-lift jacks. Dig under the deck post just enough to place the deck post into the hole and release the pressure on the jacks. The post settles into the 4-by-4 hole in the footing for a permanent concrete foot that resists sinking. This is an economical approach to a sinking deck that can be accomplished in one afternoon.

Why does my deck sink?

It is not uncommon for this to cause patios and driveways to crack. Likewise, if you anchor a deck to footings that are built on soil that is not properly compacted, your deck will probably sink. Needless to say, this is something you want to avoid.

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How do you fix a sinking deck?

0:003:43How To Raise an Uneven or Sloping Deck - Home Repairs - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd realistically if you want to raise it back up all you need to do is grab the jack. And a 4x4MoreAnd realistically if you want to raise it back up all you need to do is grab the jack. And a 4x4 something strong place it underneath a beam. And if you don't have any beams.

Can you fix a sagging deck?

Don't worry, a sinking deck doesn't have to mean a ruined summer! With a little DIY skill, you can repair your sinking deck with your own two hands (and some tools).

What causes a deck to sink?

Period House Guru explains that sagging decks can be caused by termite damage, ground that isn't level, rotting posts, problems with the joists and decaying posts. One way to address a sagging deck is to install a jack on both sides of the deck's lowest position underneath each horizontal support beam.

How much does it cost to fix a sagging deck?

National Average: $1,891 That's why the average cost can be as little as $790 or as high as $3,050. Most homeowners spend around $1,891 to repair a deck. Aside from the amount of repair needed, you'll also need to take into consideration the overall size, materials, customizations, and labor.

How do you reinforce a sagging deck?

Fixing Crowned JoistsMove the Joist. Push down on the joist by attaching a pipe clamp or Deck Devil to the top of the joist and to the bottom of the beam. ... Remove Material From the Joist. Remove the blocking on each side of the joist. ... Turn the Joist Upside Down. ... Add a Sister Joist. ... Pull Up on the Joist. ... Replace the joist.

How much does it cost to reinforce a deck?

Smaller repairs and fixes cost $48 to $150, and more extensive repairs cost $1,800 to $3,000. The total cost to repair a deck will depend on its size, the extent of the problem and the cost of the materials....Deck repair costs:National average cost$500Low-end cost range$48-$150High-end cost range$1,800-$3,0001 more row•Sep 11, 2020

Why is my deck sagging in the middle?

Sagging decks almost always indicate a lot of damage because the joists, the posts, and the deck boards all contain damage to make a deck sag in the center. A deck that sags in the middle isn't safe to use, and you shouldn't try to test the boards or see how damaged it is yourself.

How do you reinforce a deck?

To stiffen the deck, go underneath and install a row of 2x8 blocks down the center, perpendicular to the joists. Stagger them with enough room to nail or screw them in place through the end grain, then fasten the treated 2x4s to the underside of the joists so they run from corner to corner, forming an X.

When should I replace my deck posts?

Clear grass or stone away from the bottom of the deck post. Prod along the bottom of the post with a screwdriver or an awl. If the wood is spongy or pieces easily peel away, you'll need to replace the post.

How much should it cost to reboard a deck?

Pressure Treated Wood: Between $1.60 to $2.00 per square foot. Cedar Deck Boards: Between $3 to $6 per square foot. Redwood Deck Boards: Between $10 to $15 per square foot. Ipe Deck Boards: Between $10 to $20 per square foot.

How much does it cost to replace a 12x12 deck?

High-end deck repair cost - $10,000 to $17,000. A high-end deck repair includes replacing an entire wood decking of a 12x12 deck. Replacing railings or upgrading to composite decking material will add up to that price.

How long should a deck last?

Traditional wood deck: Typically 10 to 15 years. Capped composite: Industry experts agree these boards can last 25 to 30+ years. Capped polymer (the best of the best): Because of its superior material composition, capped polymer boards can last much longer, potentially 50 years or more.

How do you jack up a sagging porch?

2:244:49How to Raise and Level Sinking Front Porch Deck Handy Manny - YouTubeYouTubeStart of suggested clipEnd of suggested clipTo put the jack on top on top of and then I raised the porch from there a jack. You may or may notMoreTo put the jack on top on top of and then I raised the porch from there a jack. You may or may not be surprised. Most people know somebody who has one.

How do you fix sagging composite deck boards?

2:093:47Sagging Deck Planks Repair - YouTubeYouTubeStart of suggested clipEnd of suggested clipPossible I go in about an inch on the outside planks I drill down a little bit and then angle as farMorePossible I go in about an inch on the outside planks I drill down a little bit and then angle as far as I can get away with. So I can feel it go all the way through. I'll do it to both sides.

How do you reinforce a deck?

Reinforce post connections Strengthen post connections with carriage bolts. Drill holes, knock the bolts through, then tighten a washer and nut on the other side. Ideally, posts should sit directly under the beam or rim joist to support the deck.

How do you jack up a deck to replace beam?

0:304:08How To Replace Deck Supports - YouTubeYouTubeStart of suggested clipEnd of suggested clipBut they can raise it up by turning this screw. I rented two of these and the plan is to use aMoreBut they can raise it up by turning this screw. I rented two of these and the plan is to use a couple of two by fours between the jack posts. And slowly raise the deck back up to its normal height.

What to do before digging frost footings?

Before you dig your frost footings, you will want to make sure the soil is properly compacted to support the deck load. Often when new houses are built, the process of digging the foundation disrupts the soil and leaves the yard unsettled. This means the entire yard will slowly drop in elevation relative to the house. ...

What to do if your yard is unsettled?

If you suspect your soil is unsettled, you will either have to wait for the yard to settle or dig the footings to a depth where the ground is compact. Certain kinds of soils are more problematic than others.

Can a deck sink if you anchor it to a footing?

It is not uncommon for this to cause patios and driveways to crack. Likewise, if you anchor a deck to footings that are built on soil that is not properly compacted, your de ck will probably sink.

How do you know if your deck is sinking?

Taking a closer look, it appears that the feet of the deck have become shorter. You sight down the horizontal boards and sure enough, the deck is sinking.

Why does my deck sink?

Sinking decks often occur because of improper inspection of the soil before the deck is built. The major issue is typically the soft fill dirt that originated when the home was built. Before you begin to lift and stabilize the deck, know where the soft dirt ends and the solid earth begins.

How wide is a footloose deck?

Molded concrete deck feet are available to spread the weight of the posts. This type of footing is about 12 to 16 inches wide and about 12 inches tall with a 4-by-4 hole centered on top.

What to do when you can't drive rebar?

When you absolutely can't drive the rebar any farther by hand, you've hit solid footing. If you're still not satisfied you've hit solid ground, consult the frost level for your area. You'll need to be at least that deep.

How to use rebar in soil?

Do this by hand, using a piece of rebar bent at 90 degrees. Push it into the soil as hard as possible, using the bent top as a handle. The rebar should penetrate through the soft soil relatively easily. When it hits solid ground, continue pushing with more force.

Why does my foundation crack?

The property surrounding your house slopes or angles toward it creating water puddles around the home’s base, particularly during heavy rainfall. The soil can loosen and erode over time causing your foundation to sink and crack.

Can a sinking deck be returned to its original condition?

When damage is caught early enough, sinking decks and other additions such as concrete patios, wood porch decks, sunrooms, and bay windows pulling away can be returned to their original elevation and condition.

What to do if a deck post is sagging?

You will need to do so to either fix a bowed post or to refill the hole beneath the post with new concrete and packing to help brace the deck against future sagging.

Why does my deck settle over time?

One of the realities of any deck project is that it will settle over time. This is because soil eventually shifts, compresses and otherwise moves with Mother Nature. While you can use recommended installation methods to build the deck as securely as humanly possible, settling issues are sure to arise.

How long does it take for a deck to settle?

Or it may only settle once in 15 years. It all depends on the conditions of your soil and the area where you live. If the deck continues to sink over time, you will eventually reach a point when you will need to completely replace the deck. Tim Anderson has been freelance writing since 2007.

Can you raise a deck all at once?

A mistake that you should avoid is raising the deck all at once. If you try to jack the deck up in this manner, you will cause the joists to crack, split and, in the worst case, break in half. The goal, once you have your cross-joist braces in place, is to put the jacks under the braces and then raise them incrementally 1/4 inch at a time.

Can you jack up a deck?

One of the most important aspects of jacking up a deck is that you cannot simply place jacks under two or three of the joists and expect to be able to lift the entire section. If you do this, you will simply lift sections of the deck, not the whole area.

How thick should a deck footing be?

Make the footing as thick as possible, but the minimum thickness is at least the width of the distance from the face of the 12" tube and preferably more because it probably not placed, vibrated and finished like most concrete footing poured when there is better access.

What to do if your footing is built on fill?

The only thing you can do is put in temporary support, remove the post and old footing, then dig down to virgin soil and place a new footing at this level.

Why is my brick post pushed down into soft soil?

In any event that particular post location is on poor soil. and the brick just pushed down into a soft soil because there were carrying more load to the soil. Your plan sounds good. Go as wide as possible to put in a spread footing while the load is removed from the deck.

Can deck footings be placed on top of the ground?

Because the ground does not freeze here, code allows deck footings to rest on top of the ground. But I went the extra step to dig a hole down to undisturbed dirt before pouring the footing using a 1' diameter sonotube.

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