I have contractor company building a retaining wall for me which is 6 feet tall wall. They don't install fence.
So I have the cap glued down properly and secured. Can I get the railing install on top of the cap. the railing will be bolted to cap.?
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I recommend you use six-foot (72 inch) posts inserted about halfway into the wall. The tops of the posts, or the top of the railing they will support, should be 39 inches above the grade of the gravel behind the wall.
The wall blocks seem to be hollow, and filled with gravel. So you could insert the posts into the blocks as the wall is built and tamp gravel around them.
A stronger construction is to bury the posts' lower halves just behind the wall. This loses about 6 inches of real estate but minimizes chances of cracking the blocks.
Of course you should have planned the railing and installed the uprights as the wall was being built. Your contractor is not going to like digging up gravel and tamping it down again.