Create a beautiful patio block mailbox column in a few simple steps.
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Before beginning any excavation, check for underground utilities. Call the North America One Call Referral Service at 1-888-258-0808 (or just dial 811) for a national directory of utility companies.
Wall block sizes vary by style and market. Use the quantities of block and retaining wall pins in the material list as guides. Also, when purchasing wall block, remember that some block has an interlocking lip on the bottom for use in retaining walls, not stacked block projects.
Install the first course. Place the blocks as shown, centered within the 42-inch square. Level front-to-back and side-to-side, making sure each block is level to each other. Insert the interlocking pins into the pinholes.
Install the second course. Center the next course of units using the interlocking pins for alignment, and secure them with adhesive when necessary. Insert the pins into the pinholes. Continue to build the column, alternating between course layouts.
Dry fit each course of blocks before you apply the construction adhesive to ensure that you have the correct blocks, orientation and fit.
Install the first mailbox course. Place the units and secure with adhesive when necessary. Use a semirigid backing material, (e.g. non-expanding spray foam) to create a seal 4 inches behind the face of the mailbox. Next, fill in the space around the mailbox with grout so that it’s flush with the mailbox face. Make sure the mailbox will open and close freely. Insert the interlocking pins in the highlighted center pinholes.
Install the second mailbox course. Place the units and secure with adhesive when necessary. Fill in the space around the mailbox as described in the previous step. Clean and dry the top surface of these units to prepare for the cap units.
Finish with 12 caps. Once you have all eight of the caps for the bottom layer in place, lift one cap at a time and glue the caps to the column using concrete adhesive. Center the four caps for the second cap layout to complete the column.