What type of substrate should I use to install pavers over an existing poured slab patio


I have a 18x20 second floor deck with three 6x6 support posts. Under the deck is a 40-year-old, well-settled, 12x20x6" concrete patio. The deck posts are set outside of the patio, set on footings underground - so the posts are buried. I'd like to extend the concrete patio so it matches the dimensions of the deck. That makes for a 6x20 extension.

One of my concerns with the concrete extension is that the new pour would surround the posts and I want to take the necessary precautions so I don't cause any future problems.

As for the extension, my plan is to implant short lengths of rebar into the side of the patio to help keep it and the new pour even. I will make sure the new pour is deep enough keeping the frost line in mind and using compacted aggregate underneath. Any thoughts or concerns with this approach?

I've read where I should use a 1/2" rubber wrap around the posts to accommodate post and/or concrete expansion. Is this advisable? Can I (or should I) seal...

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Make a plan.

A good plan is essential to a successful paver project. Think about where you want your path,


, or


, and then use graph paper to make a scaled drawing of the immediate area.


in your paver project. You'll have to play around with your design a bit, so be sure to use pencil and keep your drawing neat. Your project will need to have adequate drainage if you want it to be safe and durable. You'll also want to make sure that it slopes away from your house and other structures. To ensure adequate drainage, you should have a slope of at least 1/8" per linear foot (1/4" slope per linear foot is often recommended).



/2/26/Install Pavers Step 1 Version...

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Dirk Lentfer: How could I go about pavers over my existing concrete drive way or slate strong enough to drive on ?

Ron Budman: I had two issues with the way I built this patio over the old concrete one. First, the holes left from the 2 X 4s’ between the slabs should have been filled with concrete. Rain water seeped down through the tiles and washed some of the leveling sand down and through these holes. Apparently there is quite a bit of wash out under some of the slabs. I had to pull up most of the center pavers and fill the holes with concrete and then re-level with sand. It really wasn’t a pleasant experience. The second issue was when I decided to coat the patio with Thompson's Water Seal. Well with just one coat, the water seal changed the color to a dark gray brown blotchy mess. So to make it look smooth and consistent, I had to give it two coats, and at about three gallons a coat, it got expensive. The water seal does the job; however, I never thought it would cause so much...

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Although a concrete patio can provide you with a functional space to enjoy outside of your home, it may not offer the ambiance and esthetic value that you’d like. Fortunately, this problem can easily be remedied by installing pavers on top of the existing concrete surface.

Numerous homeowners throughout NJ and its surrounding areas make the decision to do so each year. It’s not uncommon, then, for us to receive inquiries about the process.

Some of our customers wonder if installing pavers over concrete will be reliable and offer structural integrity, while others are concerned with the necessary steps for construction and the total cost of the project. The intent of this post is to address these common inquires and help you to make the best decision about your patio upgrade.

Why do people install pavers over concrete?

If you’ve already got a concrete patio, you may be wondering why you’d want to expend the time and effort on covering it up in the first...

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Pavers are fast becoming the most popular materials used in patios and driveways throughout the world. Thanks to their popularity, there are many questions surrounding their installation and use. Here are the most popular or often asked questions. If you have questions, please feel free to ask and we will answer them as soon as possible. However, most questions can be answered here.

Why should I choose pavers over other forms of patio flooring?

Pavers last longer and more far more durable than any other type of flooring including patterned asphalt, stamped concrete, concrete poured slabs, or wooden structures of any kind. Pavers are also far less expensive over the long haul, considering they will never need to be replaced… only repaired should they become damaged. Repairing pavers is also easier and less obvious than patching any of the other options.

Exactly how long can I expect my pavers project to last?

Believe it or not, a pavers patio or even...

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Hello nomoremoney and welcome to the community!

I have to say I like you screen name it really describes the amount of the work being done around your "new' home :smileyvery-happy:

Can you use slate tiles on the outdoors really depend on your geographical location and the type of the slate tiles being used.

In other words, if you live in the cold climates where during winter you have a frequent freeze and thaw cycles I would be careful when selecting slate.

So in order to determine which slate can uses on your patio I would need to know you location first?

Especially with being said that previous owner poured patio himself and there are some rocks from the base falling out.

Rocks are probably falling out because they were not sufficiently compacted at the first place and in addition concrete may not be air entrained and controlled with joints.

Are there any cracks on the patio and are there any control joints?

When it comes to...

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Since nobody else it going for this, then I'll give my two cents (based on limited experience, so please, anyone else feel free to chime in).

When it comes to concrete roads, for example, after patching it a few times the road eventually becomes too worn out, and the concrete is rubblized (into crush and run). Then fresh pavement is layed on top. Here's a look at some overlaying options for roads: Concrete Pavement Overlay Design. This isn't a manual and it's not extremely helpful but some of the pictures might help you visualize your own possible solutions.

With that being said, I realize this is just a patio... but the similarities to highways is not so remote that you couldn't glean something from studying how they're done. I think the biggest issue you have to deal with is levelling the area. I'm afraid that I don't really know what's going to work for you. Your idea of whitetopping may be okay... but you also said something about 2 inches... so, I think that the...

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Do you have a concrete slab and want to install pavers directly over the top?

This is a very popular question amongst homeowners. Many people want the look of a new driveway or patio but don't want the cost and hassle of having to rip up the existing concrete slab. There are many different views on this and it really does depend on the nature of your particular project and the condition of your existing concrete slab.

Pavers Over Concrete—Can it be done?

Yes, it can be done but there a few things to consider before carrying out such a project. First, it is a good idea to get professional advice. So contact a licensed contractor and ask as many questions as you may have. Basically, installing pavers over concrete has its limitations. If money and time are not an issue to you, it is best to get rid of your concrete slab and start your new project from scratch. However, if this is not an option for you there are varying opinions on how it should...

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Do pavers need to be mortared into place?
No mortar is needed to install concrete pavers. It is recommended that you use course granular sand, which will bind the pavers together with a friction joint. This sand is swept into the joints and compacted to achieve the proper installation.

What is the white residue on the pavers?
The white residue on top of the pavers is a condition called efflorescence. This condition is greatly minimized with the use of Pavestone pavers because of an additive that Pavestone uses to control this condition. Efflorescence will wear off in about 2 to 3 months naturally but it can be removed with whitewall cleaner and a wire brush. Ask your Pavestone dealer about other professional cleaners.

Where can I get a plate compactor and what do I need it for?
Just about any equipment rental yard will have a plate compactor usually renting for about $45-$60. One of the final steps in completing your Pavestone paver project is running a...

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Many people want to install pavers over concrete. Perhaps they have an old installation built on a concrete slab, or perhaps they want to avoid doing the work necessary to rip up an old concrete patio or driveway. Installing a base of aggregate may be the best option, but perhaps the best is not needed in this situation. A consumer or contractor may ask: can laying pavers over concrete be a good idea?

Yes, But…The Disadvantages

In short, yes, it is possible, but with a few things to keep in mind. First, having a pre-set base like concrete will restrict your creativity and freedom to add to the patio, driveway, or walkway. With an aggregate base, you have the ability to create new patterns or shapes; this is not the case if you are installing pavers over concrete. Ultimately, whether or not laying pavers on top of the pre-existing slab will depend on the project type itself. Laying pavers over a concrete patio may work fine, since it will experience little stress,...

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Common Questions

Q: Why not skip the sand and glue down all the pavers?

A: You could do that. But gluing down hundreds of pavers will add a few hours to the job and you'll spend at least $100 on adhesive.

Q: I want a bigger patio. Can the pavers extend beyond the current footprint?

A: The pavers could continue onto a standard gravel base. But the gravel base and the existing slab might shift in different ways, creating a gap or hump where they meet. So it's best to keep them separate. If you want to add a grilling area, for example, separate it from the main patio and set a steppingstone or two between the two paved areas.

Q: Can I glue pavers over the steps?

A: Yes. If your patio includes steps, you must cover the treads in order to maintain the height of the steps. Or you can completely cover the steps if you like. Just be sure to leave a gap of at least 1/2 in. between the pavers on the steps and those on the patio to allow for...

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What was once a freshly laid asphalt or concrete patio eventually begins to lose its luster through time and weathering. An ugly patio surface has the ability to mar the look of your landscape. Fortunately, there is an easy way to give your patio a facelift without the backbreaking work of demolishing and removing the existing slab. Under the right conditions and with proper preparations, paver stones can be laid across the existing patio to create a new, fresh surface that is both functional and aesthetically pleasing.

Types of Pavers

Any type of paver is appropriate for use when covering up an old patio, as long as the stones fit together and create a tight surface. This includes flagstone, brick or natural paver stones; however, if you plan to use mortar, bricks should not be used if the existing surface is asphalt. Remember that you need stones to cover the center of the patio as well as the perimeter. Flat, level pavers make the best border stones, since these...

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