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Deck On A Slope

General Building and Construction matters including sustainable building, green construction
Posts: 4
Joined: 30 Dec 2016, 14:34

Deck On A Slope

Postby Whisper » 03 Jan 2017, 20:55

I am getting ready to start working on the right side of my property in time for summer, and although I am pretty handy, this job will be somewhat of a challenge and I am in need of some advice.

The Problem...

I have a decent sized yard, but the 32 foot in-ground swimming pool takes up most of it. I have a good sized chunk of my yard that is currently not used for anything other than drainage for the pool filter (extension pvc I added for backwashing) and for a gutter extension I added (aluminium tube). I uploaded a bunch of pictures so you could see what I am up against. http://www.drumrx.com/Yard/Yard.htm

What I am looking to do...

I would really like to take advantage of this space and build an extension to my existing deck. The entire property is sloped in the rear. The existing retaining wall that holds up the dirt and decking at the pool rear ends and takes a roughly 45 degree turn.

How to go about this...

Should I simply build a triangular shaped free standing deck with some REALLY DEEP footings and somehow tie it in to the existing deck? If so, do the footings need to go 4 feet (NJ code I think) below the lowest existing retaining wall at the bottom of the slope, or do they need to go 4 feet below my neighbour property level for a total of about 5 1/2 feet?

Or, This may sound silly... Can I continue and extend the retaining wall from where it ends and have it wrap around the entire property line at a 90 degree angle going up toward where the kids play house is? My thinking is that I could also tie in some crossmember of railroad ties by extending the pseudo planter boxes and connecting them to the new retaining wall for strength. Can you even build a deck by running joists off of a retaining wall??? Do I then need to backfill, add add footings to the backfill?

Either way I go about this, I am also planning on continuing the PVC fence all the way around. With the freestanding deck, how do I go about attaching the fence to it?

Any advice as to the best, safest, and (of course) least expensive way to go about this would be greatly appreciated.

Posts: 2
Joined: 20 Dec 2010, 10:14

Deck On A Slope

Postby muckmarster » 09 Jan 2017, 07:24

You can solve all your deck foundation problems with judicious use of cantilevers, so that all your footings will be inside the retaining wall and/or far enough from the neighbour's plot. To do that, you'll need the help of a qualified design professional.

Posts: 4
Joined: 30 Dec 2016, 14:34

Re: Deck On A Slope

Postby Whisper » 09 Jan 2017, 13:21

Cantilevers? Didn't think of that. I am not an engineer, so I would have NO IDEA how to do this...

Are you saying that the footings would be like half way up the slope and the beams would be floating in thin air at the lowest point of the slope? Seems dangerous to me, especially since I would not have the weight of a building or something ultra heavy to counterbalance the weight of the overhang.

Not to sure about this... Why did you suggest this? And why do you call this impossible?Just curious??? Is it because the footings would need to be where the low retaining wall is and this is not possible due to the retaining wall itself.

I am confused. Thanks for the response though. :?

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