How do I lay a patio extension?
Thursday, March 11th, 2010 at
1:38 am
I currently have a concrete (cement) patio that is 15′-20′. I have an
8′-20′ area of grass behind it. I want to take out the grass and lay
18"-24" concrete slabs that are about 1 1/2” thick. I would like to leave a couple inch gap between the slabs and put in pea gravel. Is this complex? Please give advice.
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The best way to do this is to take out the grass and some of the dirt, leaving the area about 4" lower than you want the finish product. Rent a vibratory compactor and compact the dirt. Then fill this area with a fine compactable rock to about minus 2 1/2" from finish elevation. Compact the rock. This may require a little bit of water sprayed on it to compact well. Keep filling until you are minus 2 1/2" from finish. Then install a fine compactable sand to within 1" from finish. Compact the sand. Screed off (smooth) the fine sand to exactly minus 1". Using string lines, install the cement blocks. Be careful not to disturb the finish sand elevation. From one end, begin filling the area with a mixture of pea gravel and the silica sand. A broom works well for this. This will lock in the blocks where you want them. The cement blocks are now 1/2" high and will settle down to the desired elevation. The sand will dissapear and you will only see the pea gravel. All these products can be purchased at Home Depot or Lowes. Good luck!
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