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Pavers over concrete patio?

Posted on 4/12/21 at 9:06 am
Posted by Polar Pop
Member since Feb 2012
10748 posts
Posted on 4/12/21 at 9:06 am
I want to install pavers on top of my 10x15 concrete patio. Is the bed of sand necessary or can I just glue every paver down along with the perimeter strip?

The concrete it is going on top of is only 2 years old with no defects.
Posted by lsugolfredman
Member since Jun 2005
1844 posts
Posted on 4/12/21 at 11:10 am to
Interesting concept. I would like to do something similar on aggregate concrete patio. Not sure of how this would work.

Posted by dlambe5
Prairieville
Member since Jul 2009
625 posts
Posted on 4/12/21 at 11:13 am to
If you are putting it on top of concrete, don’t think you need a bed of sand. I would use some mortar to adhere to the concrete.
Posted by Zissou
Member since Jun 2012
284 posts
Posted on 4/12/21 at 11:14 am to
Looking at the same exercise here, and got written instructions from Firerock Pavers.

LINK

Scroll down, and they recommend grout on top of slab, no sand.
Posted by Zappas Stache
Utility Muffin Research Kitchen
Member since Apr 2009
38624 posts
Posted on 4/12/21 at 11:20 am to
Of you are grouting perimeter bricks, you are creating a bathtub when it rains. So you need to grout all bricks so there is no opportunity for water to get down there.
Posted by Geauxld Finger
Baton Rouge
Member since Jan 2005
31657 posts
Posted on 4/12/21 at 11:22 am to
mortar set the pavers on top of the concrete and mortar all the joints. you need it to be water tight or its going to trap water. (what zappas said)

not sure on aggregate but i'd expect it would be the same. that look would be awful if visible though
This post was edited on 4/12/21 at 11:23 am
Posted by doomsday
Member since Dec 2009
11 posts
Posted on 4/12/21 at 12:04 pm to
I've done it. Glue outside perimeter with landscape adhesive. Use polymeric sand for the joints. The rain draining off the roof will cause you to refresh the polymeric sand every few years where it hits. Much easier than mortar.
Posted by lnomm34
Louisiana
Member since Oct 2009
12602 posts
Posted on 4/12/21 at 12:45 pm to
quote:

I've done it. Glue outside perimeter with landscape adhesive. Use polymeric sand for the joints. The rain draining off the roof will cause you to refresh the polymeric sand every few years where it hits. Much easier than mortar.



I've been researching this myself. I read one article that suggested drilling holes (completely through to the dirt) in the existing concrete to allow for drainage.

Not sure how valid that approach is.
Posted by doomsday
Member since Dec 2009
11 posts
Posted on 4/12/21 at 1:04 pm to
Drainage is certainly a concern. I was not comfortable with the pavers being above the slab lines and above the weep holes so I left a 2 foot gap from the brick for drainage and painted the concrete slab. The patio already had the proper tilt for drainage and is completely exposed with brick on 2 sides.
Posted by Zappas Stache
Utility Muffin Research Kitchen
Member since Apr 2009
38624 posts
Posted on 4/12/21 at 1:33 pm to
quote:

I read one article that suggested drilling holes (completely through to the dirt) in the existing concrete to allow for drainage.


Don't do that. When water gets under concrete it will heave and/or crack.
Posted by Polar Pop
Member since Feb 2012
10748 posts
Posted on 4/12/21 at 2:05 pm to
Thanks for the replies.

What I am trying to do is raise the entire footprint of my patio to alleviate water pooling in heavy rains.

I installed a channel drain along the front (15ft) but on downpours it doesnt take much to back up.

That feeds into the terrible design of my yard draining down into my heavily sloped patio. I am basically dealing with a "V".

Had one of my very experienced contracting customers come out and inspect for a possible pour-over, but the hardi plank comes down too low to do it at a proper thickness.

I would definitely mortar all joints, I need this thing tight as shite.

So yall say use mortar as the adhesive for all tiles to concrete?
This post was edited on 4/12/21 at 2:07 pm
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