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Old 08-16-2013, 04:14 PM   #1
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Bedding Sand to level pre-cast wall block & pillar kit?


Can I use a bit of coarse sand under a 2' high planter wall w/ pillars?

I have the base pretty well leveled with 6" of compacted RCA but when I test a few blocks of the first row I see some spots need a bit of tweaking. (perhaps 3/16" or 1/4").

Does the wall block & pillars need to go directly on the RCA base or can I screed a bit of sand under it? I'm doing a patio as well and realize that a 1" bed of sand is needed under the pavers, but I'm thinking perhaps only about half that under the wall would really help me get it perfect. Yes or No?



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Old 08-17-2013, 03:52 AM   #2
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Bedding Sand to level pre-cast wall block & pillar kit?


its yours so why not ? ' pretty well leveled ' seems inadequate to me - did you screed the base before AND after compaction ? usually watering base helps w/compaction & sand don't compact

better to do it right the 1st time than do it over & suffer the scorn from our honey-do list originators, ain't it ?

good luck !

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Old 08-17-2013, 01:17 PM   #3
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Bedding Sand to level pre-cast wall block & pillar kit?


Yes, you can use sand, it's what's generally used commercially to level the first course........
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Old 08-17-2013, 08:59 PM   #4
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Bedding Sand to level pre-cast wall block & pillar kit?


Yes very well compacted. State grade RCA. 3 lifts 2" per.
Multiple passes each lift & sprayed until it made a ball w/ no water squeeze.

Just worried that the sand would wash out.
Install guide shows wall block down on base w/ no sand.

Base is close but sand would help tweak it to perfection

Last edited by brianosaur; 08-17-2013 at 09:04 PM.
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Old 08-17-2013, 09:08 PM   #5
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Bedding Sand to level pre-cast wall block & pillar kit?


Quote:
Originally Posted by brianosaur View Post
Yes very well compacted. State grade RCA. 3 lifts 2" per.
Multiple passes each lift & sprayed until it made a ball w/ no water squeeze.

Just worried that the sand would wash out.
Install guide shows wall block down on base w/ no sand.

Base is close but sand would help tweak it to perfection
You're probably better off following the block manufacturer's recommendations (the guide) the washing out of the sand does sound like a viable concern.
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Old 08-17-2013, 09:52 PM   #6
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Bedding Sand to level pre-cast wall block & pillar kit?


For a wall that low, it does not require any real concerns if the drainage of the soil behind is taken care of. If there is no soil behind the planter/seat the possibility of problems are minimized.

The paver specifications I gave are the typical for interlocking concrete pavers that was worked well for installations from 200 sf to 30 acres, except the base compaction on the latter one was a little more since it was only 4' above the water table and carried 40,000#+ straddle loaders turning and stopping with ocean shipping containers. The 4"x 8"pavers were 100 mm ( 3-7/8")thick instead of the 60 mm for patios or the 80 mm used for driveways and streets.

Dick


Last edited by concretemasonry; 08-17-2013 at 09:55 PM.
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