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Join Date: Nov 2015
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Stacked Paver Retaining Wall - Pinning

11/08/2015 2:26 PM

I picked up a pallet of paver retaining wall block at an auction. I do not know what the brand is and I have been unable to confirm how the layers need to be pinned. I plan to use these to level and area for a paver patio. The height will be a maximum of 15". Should I join them with rebar? Do I need to pin them?

I have attached photos of what the pavers look like. They are about 5" tall.

I couldn't get photos to upload but here are some links.

https://www.dropbox.com/sc/qhgv0u95xa7i148/AABPvONtJGb-RiByr2GH0A78a

https://www.dropbox.com/sc/l9ghz7bf151lei6/AAByCIzXEOZcLpT-qB2QWp7Ia

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#1

Re: Stacked paver retaining wall - pinning

11/08/2015 2:41 PM

I'd use a landscape block adhesive available from any big box hardware store.

Such as

Store InfoChange Store

LOCTITE PL 10-oz Adhesive

Item #: 214677 | Model #: 1654392

26 Reviews

$4.99

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#2

Re: Stacked Paver Retaining Wall - Pinning

11/08/2015 10:14 PM

Those don't look like the ones I've used. The ones I've used have a small lip or tab at the bottom rear which sits over the block below to prevent it from slipping forward. Yours look like they rely on something like a 'biscuit' to prevent slipping. Since you're only planning to go 3 or 4 high, Lyn's suggestion is fine. I'd be more concerned about whether a pallet is enough, and what will you do to finish the job if it's not enough? If you measure and make a count, you may find that it takes a lot more than your 'eyeball' estimate.

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#3

Re: Stacked Paver Retaining Wall - Pinning

11/09/2015 7:00 AM

Thank you for the advice. I'll give the adhesive a try. BTW, I actually have two pallets and only need the wall on one side to level the small patio area.

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#4

Re: Stacked Paver Retaining Wall - Pinning

11/09/2015 8:44 AM

It appears that you have picked up what are called Segmental Retaining Wall (SRT) concrete blocks with a shear key cast into the bottom (?) of them.

Since you are only going to have a maximum exposed wall face of 15-inches I would not worry about "pinning" them together, UNLESS you are driving a vehicle on the retained soil behind the wall.

Yes, use the adhesive to tie the wall blocks together to help minimize displacement due to the effects of Frost Action.

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#5

Re: Stacked Paver Retaining Wall - Pinning

11/09/2015 9:01 AM

The slot appears to be in the middle, which is counter to most "pinned" solutions. Usually, a typical fiberglass pin connects two courses of retaining blocks, providing a setback gradient to the finish wall. The holes/slots are not centered on both sides of the block. These blocks do not appear to be produced for that, on the other hand, 15" is 3 courses? A pin could work fine, will # 3 (3/8") rebar work? The advantage being that they can be dissassembled for fine adjustment, the liquid adhesive can be a pain.

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#6
In reply to #5

Re: Stacked Paver Retaining Wall - Pinning

11/09/2015 9:44 AM

I agree. It looks to me like they're made to have a piece of rebar driven into the ground through the slot, to hold them in place. Maybe not a piece of rebar through every one, but often enough to stabilize the wall. And maybe every 4th or 5th one turned 90 degrees to act as a deadman with the rebar through it.

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#7

Re: Stacked Paver Retaining Wall - Pinning

11/09/2015 10:17 AM

I would stake the base course with rebar to ensure stability then use an adhesive on the next courses of stone.

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#8

Re: Stacked Paver Retaining Wall - Pinning

11/09/2015 7:12 PM

It would be better to use hot dip galvanised re bar this close to the surface.

Jim

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#9

Re: Stacked Paver Retaining Wall - Pinning

11/10/2015 1:01 PM

I agree with Lyn, You're only going 3 courses high so you're not holding back too much force. I made a 3 - 4 foot tall retaining wall and it held up perfectly with just the adhesive. The wall wasn't holding back a mountain, it was just holding back a sloped front yard.

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