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gobblet
10-31-2009, 05:44 PM
I just removed a 30ft.x4ft. high railroad tie wall. Question is: shall I still need to bury first row of block competely underground as the earth is near concrete from previous wall? As of now if I place a thin base coat of sand to level block, block is only buried about 2-3 inches below asphalt driveway.(block measurement 12"D 6"H 16"W)

DVS Hardscaper
10-31-2009, 06:56 PM
rule of thumb is you bury 1-inch of block for every 12-inches of wall height.

However, we usually always bury the entire block for piece of mind.

gobblet
10-31-2009, 07:09 PM
forgot to add, new aspalt driveway will be placed right next to wall. Does this add some stability for wall?

gobblet
10-31-2009, 07:38 PM
forgot to add, new aspalt driveway will be placed right next to wall. Does this add some stability for wall?

DVS Hardscaper
10-31-2009, 09:41 PM
forgot to add, new aspalt driveway will be placed right next to wall. Does this add some stability for wall?

No. if the block is not correctly buried, the asphalt won't keep the surcharge from bearing against the block and possibly tilting the block forward.

Also, the asphalt driveway will need replaced in 15 - 20 years.

White Gardens
10-31-2009, 10:01 PM
I go with at least 6 inches of crushed and compacted base material and then bury the first course.

GrazerZ
11-01-2009, 08:07 AM
you need to do it right or else don't do it. I see segmental retaining walls everywhere that are falling apart because they were not installed properly.
You will need to make sure the base is going to be appropriate, and therte is plenty of drainage for the wall. A 4' wall is the maximum height you can build without an engineers approval here, so make sure you do it right.

asalow
11-06-2009, 12:10 AM
I go with at least 6 inches of crushed and compacted base material and then bury the first course.

dito, sand isn't enough