Is your old concrete patio an eyesore? You can avoid the cost and mess of tearing it out by just screwing down wood sleepers and decking over it.
A concrete slab in this condition has to be either broken up and carted away or decked over.
This was the ultimate bad patio:
severely cracked and cratered, some
areas raised by frost, others sunken after
50 years of settling. Originally, it was tiled,
then the tile was chiseled off and the
pockmarked surface got a coat
A slab with this much damage can't be fixed. But it can be covered up—and this article will show you how. The results look just like a deck, but getting them is much easier and less expensive than building a deck from scratch. In most cases, this project is also less expensive than a new patio installed by a contractor. Local contractors estimated costs of $7 to $10 per sq. ft. to remove this patio and pour a new slab. You could probably replace your patio yourself for less than the cost of this project, but DIY demolition and concrete pours are big, backbreaking jobs.
Even if your patio is in terrible shape, you can deck over it. Cracks, craters and seasonal movement along cracks are no problem. But beware of these three situations:
Covering a patio with decking typically
takes a weekend or two. This patio took
much more time—five long days. That's
partly because it's a big one (14 x 28 ft.).
The grid pattern formed with different-colored
decking also added a few hours to the job. But the biggest time factor
was the unevenness of the patio surface.
All those ridges and sunken spots meant
hours of tedious shimming under the
sleepers to form a flat surface for the
decking (see Photo 3).
The cost of this project depends mostly on the decking you choose. Decking ranges from about $1.50 per sq. ft. for treated wood to more than $10 per sq. ft. for a top-grade manufactured product. The other materials for this project add up to about $1.50 per sq. ft., so your total cost could be anywhere from $3 to $12 per sq. ft. For looks and durability, we used two different colors of decking made from PVC, but there are less expensive alternatives.
Aside from standard carpentry tools, you'll need a hammer drill for this project. You can get a hammer drill for less than $50 that will do the job. But consider spending $100 or more. Even a very small patio will require more than 50 holes, and a more powerful drill will make that chore a lot easier. Also consider buying an impact driver. Impact drivers pack a lot more torque than standard drills or drivers and will drive concrete screws much better. Most models are cordless, but you can still find inexpensive corded models online.
Sleepers screwed to the concrete allow you to screw on decking. Spacers and flashing tape protect sleepers from moisture and rot. Fascia boards hide exposed edges for a neater look.
For a, printable version of Figure A, see Additional Information, below.
Mark the sleeper locations on the patio. Don't forget about extra sleepers to support stairs or railings.
The layout of your sleepers will depend on the layout of your decking. If you want a standard decking design—all the deck boards running one direction—all you need are rows of parallel sleepers. If you want a more complicated decking pattern, like the one shown here, you'll need doubled sleepers to support any boards that run perpendicular to the others (see Figure A). We also installed sleepers to support the steps we later added to the concrete stoop (see Photo 1).
This corner of the patio had settled by more than 2 in. over the years. That meant a big reservoir after rain—and water in the basement. So we filled the reservoir with exterior-grade self-leveling compound. After the first batch hardened, we poured on a thin coat and gave it a slight slope so water would run away from the house.
Self-leveling compound hardens fast, so you can get on with the project. But it's also expensive. If you're not in a rush, you can get similar results for less than one-third the cost with concrete topping mix such as Sakrete Top 'n Bond or Quikrete Sand/Topping Mix.
We also took a couple of other water-fighting steps. To prevent water from seeping down along the foundation, we caulked the gap between the patio and the house. At the other end of the patio, a corner of the slab had sunk slightly below the level of the soil and rainwater pooled there. To correct that, we shaved off the sod with a spade, dug out a couple of inches of soil and replaced the sod.
Drill through sleepers, spacers and into the concrete with a hammer drill, then drive in concrete screws. Overhang the sleepers along one edge of the patio and trim them to exact length later.
Check for flatness with a straightedge. Raise low spots with shims. At high spots, skip the spacer; stack up shims instead.
The sleepers don't have to be level‐they can follow the slope of your patio. But they do need to form a flat plane. If your patio is in good shape, you'll get a flat plane automatically. If your patio has ridges and sunken areas, you'll spend lots of time fussing with shims.To preview the situation, lay a straight board across the patio in a few spots. Look for the highest hump in the patio and fasten your first sleeper there. Then work outward from the high spot, adding sleepers and checking for flatness along each sleeper and across them. Add shims to raise low spots.
Screwing down sleepers with concrete screws (Photo 2) is simple, but there are some things to keep in mind:
You could lay your sleepers directly on the concrete, but we bought a 1/2-in.- thick PVC trim board and cut spacer blocks from it. Here's why:
Install the deck boards just as you would on a standard deck. When you reach the end of the patio, position the last board, mark the overhanging sleepers and trim off the excess.
Before decking, we covered the sleepers with flashing tape. Without it, water soaks the tops of the sleepers and the decking prevents the wood from drying. Common grades of treated lumber will rot if kept permanently damp, and flashing tape is the best insurance against that.
Installing deck boards over sleepers is just like installing them over standard deck framing (Photo 4). We began with the darker “accent” boards, screwing them into place temporarily to act as guides for the “field” boards. When we reached the end of the deck, we removed the center divider board and cut it to final length. Then we removed and mitered the border boards and trimmed the sleepers to final length.
To cover the ends of the sleepers, we used a deck “fascia” board made from 1/2-in.-thick PVC. We cut the fascia into strips and screwed them to the sleepers.
Aside from the decking, here's an estimate of what you'll need to cover 100 sq. ft. of patio. Exact quantities depend on the shape of your patio and the layout of the decking.
The simpler you can make your deck plan, the faster and cheaper it will be to build.
For a, printable version of Basic deck, see Additional Information, below.
If you're a beginning DIYer, don't let all the details on our deck scare you away. Your project can be a whole lot easier if you choose a simple decking design like the one at right. With all the deck boards running in the same direction, all you need are sleepers centered 16 in. apart. You won't need to do the careful measuring required by our design, or make angled miters and other fussy cuts. A simple deck design makes this project almost impossible to get wrong. If you have a badly uneven patio like ours, flattening the sleepers with shims (Photo 3) may take hours. It's tedious but not complicated.
You can slash the cost by using treated wood deck boards instead of manufactured decking. And if you live in a drier climate where the sleepers won't stay damp, you can skip the spacers and flashing tape.
Whether your patio is in bad shape or just bland, there are many ways to revive it. But before you weigh the options shown below, there's one thing to consider…
The crack factor Cracks in your patio drastically limit your options. That's because cracks tend to move. Some grow wider over time, while others shrink and widen as the soil freezes and thaws. Some become uneven as one side of the crack sinks. Any movement happens so slowly that it's hard to detect. But if you know—or even think—that you have moving cracks, you have to choose a patio upgrade that can “float” over moving cracks without becoming damaged.
A concrete slab provides a firm, stable base for pavers. Cover the patio with a thin layer of sand, lay pavers over it, and the results look like a standard paver patio. It's a fairly simple project and the cost is reasonable ($3 to $6 per sq. ft.), but expect a weekend or two of hard labor. For complete step-by-step instructions, see How to Cover a Concrete Patio With Pavers.
The quickest way to hide damaged concrete—or just add color—is with an outdoor area rug. They're available in a huge range of colors, designs and prices. The largest rugs are typically 9 x 12 ft. That may not cover your entire patio, but just covering most of an ugly patio makes a huge difference. Shop online or visit a store that handles patio accessories.
Getty Images/Tim Abramowitz
Interlocking plastic tiles simply snap together; no need to fasten them to the patio. Less expensive versions are plastic only. Others are topped with wood, ceramic or stone. (Ceramic or stone tiles require a flat surface—they may crack if installed over ridges or depressions.) To browse online, search for “deck tile” or “patio tile.”
Along with the deck project shown on the previous pages, here are some other projects that can withstand moving cracks:
A coat of stain followed by a coat of sealer transforms a patio in a weekend and is one of the least expensive options. But there are downsides: You'll have to reseal every one to three years and may eventually have to restain it. Also, stain won't hide damage, and any repairs will likely show through the stain. To see how to apply stain in multicolor patterns, see Renew Your Concrete Patio.
A concrete patio is a great foundation for tile. And tile is a great way to turn a bland patio into a showpiece. The cost depends mostly on the tile you choose; the project could cost $4 per sq. ft. or three times that. Freezing water can destroy outdoor tile, so if you live in a climate that freezes, pay extra attention to the details. For the complete story, see How to Build a Patio With Ceramic Tile.
With a coat of resurfacer, you can make an old patio look like new concrete quickly and cheaply. Just mix the cement-based powder with water and spread it over the patio. You can repair cracks and resurface over them, but the cracks may return. Quikrete Concrete Resurfacer and Sakrete Flo-Coat are two common brands.
If your patio isn't cracked, you could choose any of the options above or either stain, tile or resurface the concrete.
Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.
Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.