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Old 07-23-2009, 05:23 PM   #46
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Pavers over concrete patio?


The problem I see is drainage. I just installed brick pavers 20'x25' and it came out flawless however I did it over gravel and sand. I watched an video on a site called thediyhomepro and learned how to do it, on the video they stated that the gravel was a compactable base that provided good drainage. If you do it over cement you will probably need to drill drainage holes in it first so that your pavers aren't covered by water when it rains. I guess you could always add sand and taper the pavers off to one side at a small slope for drainage.

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Old 07-24-2009, 03:45 PM   #47
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Pavers over concrete patio?


My patio is already sloped for drainage. But I must maintain the same slope angle. But I was thinking. If i use sand to lock the pavers in place then water will drain beneath the pavers. Or if i use mortar, the water should drain over the pavers. Thats if mortar is water proof. I'm not sure. What do you think.
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Old 08-23-2009, 10:24 AM   #48
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Pavers over concrete patio?


I have a similar question. I put in a concrete walkway from my front walk over to my driveway to get across the lawn when it rains really heavy. the walkway is (13' long x 36" wide) to act as a base for some slate 'tiles' that are 1' thick. I was going to put in an alternating pattern of 12"x12"/12"x18" pieces with mortar to bond them to the concrete. Even though these aren't pavers, does the same type of rules apply?

P.S. The concrete walk was made of hand-mixed 80 lb bags of concrete mix from Home Depot, with roughly 5-6 bags per square at around 4-5" deep. There has been some spalling of the tops of a couple of squares over the past two years, but i attributed that to the fact that the concrete was never meant to be the finished layer, so I didn't do the regular edging/brushing that would be done to a 'exposed/finished' walkway. BTW, there have been no cracks and the walkway has seen two winters with standing ice and snow.

Last edited by ControlTech; 08-23-2009 at 10:29 AM.
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Old 09-15-2009, 01:29 PM   #49
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Pavers over concrete patio?


I have not done pavers anywhere except in va. I worked for 3 years running a paver crew, and now do ceramic tile. I did a job once where the homeowner was an engineer and poured a 10" thick concrete slab in his parking area which had a steep driveway surrounded by two retaining walls that we put in. It basically made a river to the parking area. We screeded 3/4" 'stone screenings' across the concrete and placed the pavers on it, and tamped as usual. Instead of sweeping the screenings in the joints as usual we used a product new to us at the time. This sand was a polymuric joint sand that once wet would harden but remain flexible. The slab also was presloped to a large drain since the area was surrounded by walls and the house. There was also a large grate drain at the bottom of the driveway where it connected to the parking area. This job went well, and has had zero issues. The freezing will not be an issue, and the water run off is greatly taken care of by the use of proper slopes and the hardened joint sand.
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Old 05-18-2010, 11:43 PM   #50
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Pavers over concrete patio?


Works GREAT!!! It never occurred to me to "ask" if you could, should or even "how to" lay pavers on an existing concrete patio, sidewalk, slab, etc. I just did it. I started in the back corner against the house with my first paver and laid them from there. I lay them DIRECTLY on the concrete. I DO however; mortar a very thin layer around the bordering pavers surrounding the entire perimeter TO the concrete slab to prevent movement (after straight & tight) and then I will use mortar in the middle. BUT....not mortar the middle to the concrete, just mortar between ALL the paver joints to prevent water from seeping in, thus allowing the water to "run off" as it did when it was a concrete slab w/it's natural run off grade. (I haven't mortared the middle in the attached photo...that's tomorrows project.....then when it's dry I'll use a sealant) I mortar the joints AFTER my brick cuts & after I've made sure all my pavers are tight and as close as they could possibly be & everything is as straight as I can get it. (Tip to ponder: To mortar between the joints, pour DRY mortar (the kind w/"just add water") over the joints & use a strong broom to sweep & fill in/up in all the joints and SWEEP OFF the actual brick part. Then; get your hose & lightly water to activate mortar & set. I CAUTION YOU: TEST FIRST. I did this in my backyard & my sons family uses this method, however; make sure the mortar is OFF the brick itself or it'll ruin your brick. Maybe try a test row & see if this method will work for you. I ONLY knew how to do this by watching my sons family. But BOY OH BOY.....is this a HUGE time, back & knee saver!!! Whew wee!!! I've tried to attach before & after photos, hopefully it worked! This is my front yard. I did my backyard COVERED patio 15 yrs ago & its still as perfect as the day I finished it! SUPER EASY w/existing concrete.
Attached Images
 

Last edited by funnthesun; 05-19-2010 at 12:49 AM. Reason: Explain mortar method
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Old 05-19-2010, 08:27 AM   #51
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Pavers over concrete patio?


Looks pretty good. I have actually just started getting stuff together to lay over my sidewalk again. I just did a big walk for my dad the original way (with crushnrun base). Got me thinking about doing mine again. There are very few concrete pads I have seen that I would lay pavers DIRECTLY over. They are always too bumpy, uneven, or flat out on different planes between relief joints). I have decided the best way for me is to thinset the pavers with a 1/2 u notch trowel and to use polymuric (sp?) joint sand in the joints like I would normally. Glad it worked out for you. Hope you got all that mortar dust off the surface of your pavers. A leaf blower works great.
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Old 06-01-2010, 11:36 PM   #52
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Pavers over concrete patio?


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Originally Posted by Jimbo View Post
I am thinking of installing pavers for a 20' by 25' area. Right now the entire area is covered in concrete which is in very good condition. Do I need to remove all that concrete, or can I somply lay the pavers over it? Anyone have experience doing this?

Thanks, Jimbo

As long as you are confident the conc. slab is structurally sound and pitched away from the house. All you have to do is drill holes in the existing slab every couple of feet with a concrete drill bit, to allow water to drain, and clean. I would use a construction adhesive for the soldier course and allow to dry. (Directly to the existing slab) Next step is to use an underlayment such as weed mat fabric to prevent the bedding sand from dissipating. Place thin layer of bedding sand on fabric to match hgt of soldiers, sweep in sand lock. Next use a small plate compacter to even and settle things. sweep in again and wet it down. Note: the sand lock is not regular sand it's a polymeric mixture sold in bags. It hardens and dosn't allow for as much water penetration.

Good luck

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Old 03-04-2011, 05:28 PM   #53
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Pavers over concrete patio?


We live in AZ, in the desert, and have a large patio. Break into two pieces and tip each slab toward the middle where there is a 1 in 25 ft long drain leading out and you have it. The patio now has a deterioratiing cement coating. Thinking of going the paver route. I intend to hire someone to do it but want to be prepared...if I go the sand under the paver route, I'm concerned the sand underneath will migrate to the center drain..even tho we only get 6 inches of rain per year. On the other hand, I like the sand idea because it should be easier to get the dust off the pavers since the water from my hose will force the dirt downwards every few inches or as wide as the pavers are. On the other other hand, if I use thinset, with mortar between the bricks, I run the risk of those hairline cracks on the original slab migrating up to the pavers, plus it still will be harder to hose down the pavers since the dirt/dust won't drain between the pavers. Thoughts, please?
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Old 04-24-2011, 03:05 PM   #54
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Pavers over concrete patio?


Quote:
Originally Posted by KScrafter View Post
Found this as I, too, am looking to cover a concrete patio. I have not used it....has anyone else?
http://www.handydeck.com/
I did this in Texas Panhandle. A 12X12 slab that had cracks. Blasted out cracks with air and water. Filled with sand and leveled to the surrounding area. Now this was my idea and not one else. I used concrete grey 12X12 inch blocks and asked for the strongest tube of adhesive at Lowes on concrete to concrete. Don't remember the name of the tube. The outside edge I used the tubes around each block and an x in the middle. The fine layer of sand kept it level. I then laid my pavers in a design of my liken and bingo, the patio looked brand new. I did get noise when you walked on them, so I added more sand and it seem to stop the problem. I found the water run off from the patio when I started and made sure that I had openings to let water out of the patio. Then sold the house and moved.
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Old 10-18-2011, 01:47 AM   #55
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Pavers over concrete patio?


If your concrete slab is in good condition, I found an article that uses thick pavers or retaining wall caps for the border which are glued with a polyurethane construction adhesive to the slab perimeter and regular brick pavers or other types of stone for the "field" pavers which rest on a bed of sand which covers landscape fabric laid directly on the slab to bring the field pavers up to the level of the border pavers. Check it out at www.familyhandyman.com/DIY-Projects/Outdoor-Projects/Patio/Patio-Pavers/how-to-cover-a-concrete-patio-with-pavers OR email me for a file containing the step-by-step.

Last edited by a3dsail; 10-18-2011 at 01:54 AM. Reason: to add a sentence
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Old 10-18-2011, 03:18 AM   #56
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Pavers over concrete patio?


Thanks a lot for your suggestion. I had 5 contractors give me 5 different way to do it...but redoing the whole patio from stractch meant we wouldn't need the ugly deco drain running down the center of the patio..so that won out.
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Old 10-24-2011, 10:30 AM   #57
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Pavers over concrete patio?


Have to agree with Concretemasonry here. This is similar to paving over an underground structure or a roof deck. Always provide a horizontal drainage plain (with relief drains or voids at the perimeter).
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Old 12-05-2011, 08:01 AM   #58
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Pavers over concrete patio?


I agree with many of those here who anticipate water problems by laying the pavers over a concrete slab using sand. If there are water issues, which most likely there will be especially since you are in NJ I am in NJ also), it will be a nightmare. It should cost you around $800 to remove the slab and then you will have a correct installation (stone base, etc.). You can see a diagram here. Paver Installation

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