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I have a two-part problem.

Problem #1: The grade under my deck has developed a slope towards the foundation of the house. I have begun to get water seeping onto the floor of my finished basement. The deck is about 3 feet above the ground at the house and about feet above ground 14 feet away from the house. I've crawled under to check it out (there's just enough room to crawl around) and sure enough, the four feet closest to the house (the old back fill) has sunk about a foot, and in places there are bigger sink holes leading right to the basement wall.

Problem #2: The deck itself now slopes back toward the house. I built the deck (14'x24") 23 years ago. Three years after the house was built. I decided NOT to attach the deck to ledger board (BIG MISTAKE!) and build it "free standing" right up the house with access to a kitchen door. I dug (4)post holes about 2' from the basement wall, and filled them with concrete. They were inspected to be sure they were deep enough and below the frost line. The back fill has sunk, pulling the deck down with it.

Question: Should I just tear the whole thing apart, fix the grade, and build a new deck? Or is it possible to dismantle the deck, fix the grade, install a ledger board, and rebuild the deck saving as much material as possible? I need to address the water problem ASAP before I have Problem #3: Mold in my basement!

The deck boards are installed perpendicular to the house, so I cant just remove some of the boards. They must all go!

  • Considering the age of everything I'd expect that most of the settling that was going to happen has happened. Is that the case? – isherwood Sep 21 '16 at 18:11
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    I would like to believe that is the case. My inspection found significant sink holes around the post holes that drain right toward the foundation wall. I believe very dry weather (mini drought in NE Ohio) cause the earth to dry and pull away from the foundation wall creating about a 2' path straight down to the footer drains. – Tim Niederkorn Sep 22 '16 at 20:49
  • Make that 2 inch path, not 2 feet! – Tim Niederkorn Sep 22 '16 at 21:01
  • 3' is plenty of room to fix the grade. Fixing the deck is up to you, and w/o pictures, who's to say? – Mazura Feb 7 '18 at 1:31
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I've been there. If your deck is nailed together, it'll be a real pain to dismantle and save the boards (so much denailing!).

You may be able to more easily save the joists if they are in good shape, but at 23 years, this is not a young deck (on East Coast anyway).

Your instincts are right about what could happen if you leave this as-is. In my case it was rotten sill plates and rim joists... no fun at all.

TL;DR - tear it down, regrade and build a new deck; treat salvaged material as a bonus. It's not worth the hassle.

  • Thanks. I'm leaning that way. I'm not as young as I was when I built it, so I'm thinking "contrator." – Tim Niederkorn Sep 22 '16 at 20:50
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You did not say what kind of the wood the deck is made of and the condition (other than old). I have completely rebuilt some 30+ year old redwood decks in the past that were nailed with a nail jack like this. The boards bay be able to be turned over and an almost new surface is possible after a little sanding. if the surface has been well maintained and the nails are pulled without damaging the surface of the wood screws could be used to replace the boards in the original positions. this will take more time than replacing the decking but can save thousands. You will also find material cost has dramatically increased and the quality of the lumber is lower today than it was 20+ years ago. it all depends on if there is any rotten ares with the decking if it can be reused redwood and cedar have very long lives compared to other soft woods.

  • The deck is made of pressure treated wood. The decking is showing some age with a few cracks and splits. The underside joists and posts all seem to be in decent shape. – Tim Niederkorn Sep 22 '16 at 20:32

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