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Rock Adhesive advice

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  • Aug 18th, 2019 6:45 pm
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Rock Adhesive advice

I've been tinkering around with my backyard landscaping since June, which was when I took home the remnant cuttings of muskoka rock slabs that were used to build a house. The slab bricks stack easily, and I have used them for the perimeter of both a flower and herb garden.

Was looking for suggestions on what to use to keep things together.
I'm looking for something that would enhance structural strength, but would also be somewhat easily removable should I decide to reshape/adjust.
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[OP]
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To help visualize, here's a pic from a week ago.
The stacking was rough - just to give me an idea of perspective.
Will level and stack more carefully when finalizing.

Am I nuts for thinking that a few dabs of silicone caulking (between layers) might do the trick?
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They have a "landscaping adhesive" for stone/rocks: LINK or just use general construction adhesive like PL Premium, which is good for exterior and old temperatures.

Just use a few dabs per stone instead of lots of adhesive and it should be strong enough for your needs (as long as you don't expect people to sit/stand on it) and yet easy to separate (probably with a mallet).
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shikotee wrote:
Aug 17th, 2019 11:14 am
To help visualize, here's a pic from a week ago.
The stacking was rough - just to give me an idea of perspective.
Will level and stack more carefully when finalizing.

Am I nuts for thinking that a few dabs of silicone caulking (between layers) might do the trick?
Silicone is unlikely to help. It dries out rapidly in the outdoor environment and loses all strength.

I've had better luck with the Bondex cement-like filler compound: https://www.rona.ca/en/concrete-patch-repair-38l
It at least has a cement-like texture and colour that goes better with rock. It can act as a glue, but it won't have a lot of strength holding rock together against a tension force.

Last resort would be to drill through the rock slabs and put in a hidden rod.
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Maple
Construction adhesive PL products. They are used for outdoor landscaping.
[OP]
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I've never used PL products before.
How much of it should I use?
Would a dab on each end of rock suffice, or would I have to cover all contact points?
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I would say more than a dab but you don't have to cover all contacts. The more is the better.
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Just to clarify - I would apply the dabs after stacking (the sides), or apply the dabs and squish like a sandwhich?
Sorry - total masonry noob.

The slab cuts are smooth, and the rock is very flush when stacked. Would the dabs impact this, or would the weight make no difference?
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shikotee wrote:
Aug 17th, 2019 10:14 pm
Just to clarify - I would apply the dabs after stacking (the sides), or apply the dabs and squish like a sandwhich?
Sorry - total masonry noob.

The slab cuts are smooth, and the rock is very flush when stacked. Would the dabs impact this, or would the weight make no difference?
I would make a line of squish, the weight of the rock will push/balance the adhesive around under the rock,

I suggest to search on youtube.
https://ca.video.search.yahoo.com/yhs/s ... ction=view
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teoconca wrote:
Aug 17th, 2019 10:51 pm
I would make a line of squish, the weight of the rock will push/balance the adhesive around under the rock,
Agree to squish but it’s not mortar. Will even it out when applied right and keep it from rocking but only so much if you have a kid that wants to walk on it as I’m sure my nut bar kid would.
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My kid does hardscaping as a summer job, works for a high end company. He said Gator Block XP is better than PL when we were looking for adhesive for a small stone job, it'll hold level better if you are using a large dab to even out stones. Out east Arntz sells it.

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