How to Build a Floating Deck

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The main reason we moved to Michigan was to be closer to family. Which of course means more projects get added to the “to do” list. We love to build but even more we love to help out family, so when my brother-in-law asked me to help out on a deck build I jumped right in! We designed this deck to be a freestanding deck, we did this because in the county he lives in a deck attached to the building becomes taxable. To avoid this we decided a floating deck would be the best option. We wanted to keep the design simple and clean, so with the help of our friends over at Kreg Tool Company, we used the deck jig and let the wood do all the talking.

Note: The following post is by no means the only way to build a deck, or even the best way. It is the way that we choose based on our needs.

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How to build a Floating Deck

First and foremost, always check your local codes and pull permits if required. Since this is a free standing deck and less than 36″ off the ground our local code did not require a permit. Pure coincidence, or maybe not. Since this is not connected to the house the deck blocks were sufficient for us and saved us a lot of time. If you are connecting the deck to the house you will more than likely need to pour concrete footings that will extend beyond the frost line to prevent the deck from heaving up with a frost. The required depth of your footing is determined by your local code. To do so, dig your holes with a rented auger or post hole digger and pour the cement into the hole to create a footing. With our deck being freestanding, the frost may heave it up slightly but once it thaws it will settle back into place.

Now that we got that out of the way. We started by marking where we wanted the deck blocks and dug down about 6″ and tamped it down to make sure we were placing our deck blocks on solid ground. We used 16′ beams so with a maximum span of 6′ and 2′ of overhang on both sides we only needed 3 posts per beam. Our deck was 20′ wide so the spacing between beams is 8′ with 2′ of overhang on both sides. This meant we would need three beams however, there was a bump out in the house that would require another small beam. Either way we needed 11 holes for the deck blocks.

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Next, we added about 6″ of stone dust (aka paver base or slag) and tamped it down.

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Next, we placed the deck blocks and assured they were where they needed to be. Then we made sure they were level and if not we added more stone dust to the low side, tamped it down and checked again. The overall height of the blocks was not crucial at this point as long as it was no higher than 18-20″ below the bottom of the door. We ideally wanted to be slightly lower than that.

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Now we placed our 4×4 posts in the deck blocks and marked them with a laser level 18″ (9-1/4″ for beams + 7-1/4″ for joists + 1″ for decking + 1/2″ for good luck) below where we wanted the top of our deck to be. Then, we headed over to the saw and cut them all down to size making sure to place them back in their correct block.

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Now we attached the BSC post cap bracket to the post using 1-1/2″ connector screws. This allows us to connect the 4×4 post to the beam which will be two 2x10s screwed together.

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Now we screwed our two 2x10x16′ together using 2-7/8″ heavy-duty screws.

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Placing the beams we double checked for level and made sure the beams were square to the house and spaced correctly apart.

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Then, we added the cap to our beams since we would be using the beams to create a step.

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We decided to space our 2×8 joists 16″ apart to allow them to span a larger gap (8′ between beams). Leaving about 1/2″-1″ between the house and the deck for drainage, we marked where the edge of our joists should go.

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Then, we toe nailed the 2x8x12′ joists in place with an overhang of 2′ on both sides and added end caps to the sides. We stopped our joists 16″ short of the end of the beams to create the first step down. Then the freestanding box built from 2x8s spaced 20″ apart was built for the final step.

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To create the first step down we installed joist hangers and a 2×8 within the beams and added 2×8 joists spaced 20″ apart.

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Then, we laid and leveled 4″ concrete blocks for the final step to rest on. It ended up being a little higher than I would have liked but I think we will eventually add a row of pavers or something if the last step proved to be too high.

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How to Install Decking with Concealed Fasteners

Kreg Deck Jig Banner

This was one of my favorite parts of the whole deck build. This screwless look is so cool! To conceal the fasteners we used the Kreg deck jig. It was more work but in the end we are so glad we did it. Kreg states that it will work with cedar or redwood decking as well as composite decking with a square edge (not with the groove in the side). Since we went with 5/4 cedar decking (actual thickness = 1″) we are good to go. Isn’t she beautiful?

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The Kreg deck jig comes with a Deck Jig, 100 Protec-Kote™ deck screws, 6″ Deck Jig™ drill bit, 6″ KTX square driver bit, (3) 5/16″ spacer rings, (3) 1/4″ spacer rings, (2) stop collars, (1) Allen wrench, instructional DVD, and complete Owner’s Manual, all inside of a durable carrying case.

We got 2 jigs to help us get jiggy with it speed things up. We also discovered that with the 5/4 cedar deck boards, you really didn’t need to pre-drill the holes except for the ends of the boards. This also helped speed thing up.

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Here’s a quick gif so you can see it in action.

Kreg Deck Jig

After all the deck boards are secured we dropped a chalk line and cut it with a circular saw.

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Then we repeated the same process for the steps and the deck was done!

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Or so we thought. Stay tuned for the deck stain post. The color turned out so fricken amazingly you are not going to want to miss it!

Questions? Comments?

As always, if you have any questions don’t hesitate to comment below and especially don’t forget to post pictures of your finished products in the comments! ENJOY!

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  • joshskies

    Jut started following this blog and this build is awesome! Two quick questions though…

    1st – were there building permits involved? it is technically not connected to the house, so I’m guessing it isn’t required.
    2nd – What are your thoughts on the resilience of the decking with the pocket screw-type method you used? any additional warping or cracks in the wood could require maintenance and it looks like you would have to remove all of the board from the end to the board requiring help! Of course, sealing and other preventative measures would help, but for the sake of argument…

    Again, this is awesome. Love the blog/website. Keep on keepin on! Break the mold! Be all you can be. Like a rock. ehm… The more you know. “insert motivational caption here”.

    • Yep, you got it. Keeping the deck not attached to the house avoided the need to pull permits plus keeps it not taxable.
      As for the cracking and warping issue, There will more than likely be some cracking issues as the deck settles. You can access the screws from between the boards, so you can just make the repairs as needed without removing additional boards.
      And thanks a ton for the motivational words of encouragement. We seriously appreciate it. Happy building my friend.

  • Chris Duchardt

    Just built one of these myself and thought I would throw in some pics as well…The Zip System building is my shop. I added a small piece to that end of the deck so I can walk right out the door and into the shop without having to go up and down. I also ran the deck right into my “old” garage so that everything was at the same level as my garage is a dirt floor and the walls set right on the ground.

    • Dude this looks awesome! Like how everything is at one level.

  • American Patriot

    Would you mind giving us an approximate dollar amount for what it cost you to build your deck? I’ve never built a deck before but some of the quotes we’ve been given from contractors are prompting me to want to do it myself.

    • We built the deck out of cedar which made it a little more on the pricey side, but it cost about $1500 to build.

  • Rafael Fagundes

    hey. What kind of wood you used? cheers from brazil

  • Peter Wojas

    I have a similar design in mind. I’m just wondering if you get any lateral movement? Also, how are the blocks handling the weight after some years? I’m wondering how many blocks I can get away with using. Tia

  • Elchompis

    Great build, the deck looks great, its been a year and days after you did this build i have couple of questions for you hopefully you have some time to answer them 🙂 how is the deck performing? at this point would you change anything that you did? is everything ok with the use of the Kreg deck gij? do you see any problems with the way you install the boards with no visible screws?

    Thanks in advance “)

  • Dp

    One question. What length of 2×8 did you use for the joists on this deck to make it 20′ wide? Did you use 2x8x12’s and cut them down by the 4′ to make the deck 20′ wide?
    Thank you.

    • I used 12′ boards and overhung them in the middle.

  • Jay Zee

    Did you put in weed barrier and stone below the deck? Also how does the lowest step attach to the main structure?

  • Ryan

    Hi there. I’d like to follow your example when building my deck. I have a few weird spots I’m trying to wrap my head around. The biggest question is joining beams. I need to run 20′ and local shops only carry up to 16′ for 2×10. Could I simply run by beams 12′ long and but in additional beam running 8′?
    Even if I were to change their direction, the plan is for 18′ wide, so I’d have a similar problem that way.

  •  ʎppɐpʎɹɐuıq 

    Hey Jamison! My sister just closed on her house today and I’m headed up to Ypsilanti this weekend to put this deck behind her house! You did great here and can’t wait to follow suit on the design! Are you close by? Wanna come over and supervise?! LOL

  • Bryan

    Hey Jamison I built this floating deck this spring in time for our sons graduation. Great plans easy to follow. The design and concept seemed a perfect fit for the cold of New England. We added a side rail to keep the young children from jumping off the sides

  • q1712593

    If you want to make your own woodworking yourself just look for WoodPrix website. There is all you need to make it 🙂