RCP BLOCK & BRICK
San Diego County & SW Riverside Locations:
(800) 794-4727|
Installation: Country Manor Mailbox
Country Manor Mailbox Installation

Building a Country Manor Mailbox

*This project video and walkthrough provided by Keystone Retaining Walls and serves as a general explanation of how to build this project. Measurements and products may slightly vary when using RCP manufactured units. Please contact us if you have any questions.

Overview: Getting Started

This project idea is a takeoff of the standard 30"x30" Country Manor Column. By simply adjusting the top two block courses, you can create this awesome mailbox option! Maximum height recommendation of this project is 54" (8 courses above grade with 2 courses of 3" cap)

Mailbox Detail OverviewMaterials Needed:

  • (34) Country Manor Large Block
  • (38) Country Manor Small Block
  • (12) Cap
  • (42) Keystone Pins
  • (2) Tubes Masonry Adhesive
  • (6 cuft) 3/4" Crushed Gravel
  • Mail Box (Sold Separately)
    Fit into 10"W x 12"H x 20"D opening
  • Non Shrinking Grout

Required Tools

  • Shovel
  • Hand Tamper
  • Level
  • Trowel
  • Dead Blow Hammer
  • Calking Gun

Excavate BaseStep 1: Preparing the Location

Mark the column location and excavate a 12" deep x 42" square. Compact the soil. Add 6" of granular base material. Compact and level base to avoid settling.


course 1 3 5 7Step 2: Install the First Course

Place the blocks as shown, centered within the 42" square. Level front-to-back and side-to-side making sure each block is level to each other. Insert the Keystone Interlocking pins into the highlighted pinholes as shown above.

Note: Use this layout for courses 1, 3, 5, & 7

It is suggested that you dry fit each course of blocks before you apply the construction adhesive to ensure that you have the correct block, orientation & fit.


courses 2 4 6Step 3: Install Additional Courses (2-7)

Center the next course of units (as shown) using the Interlocking pins for alignment, and secure them with adhesive when necessary. Insert the Keystone Interlocking pins in highlighted pin holes.

Note: Use this layout for courses 2, 4 & 6

It is suggested that you dry fit each course of blocks before you apply the construction adhesive to ensure that you have the correct block, orientation & fit.


first mailbox courseStep 4: First Mailbox Course
(Course 8)

Mailboxes comes in a variety of sizes and shapes. Make sure you select a mailbox unit that will fit within the 10"W x 12"H x 20"D opening.

Place the units as illustrated and secure with adhesive when necessary. Use a semi-rigid backing material, (e.g. a non expanding spray foam) to create a seal 4" behind the face of the mailbox (see “Detail A”). Then fill around the mailbox with grout so that it’s flush with the mailbox face. Make sure that the mailbox will open and close freely. Insert the Interlocking pins in the highlighted center pin holes (as shown).


Second Mailbox CourseStep 5: Second Mailbox Course
(Course 9)

Place the units as illustrated and secure with adhesive when necessary. Fill in around mailbox as described in step 4. Clean and dry the top surface of these units to prepare for the cap units.

Next step is finishing the mailbox with the capping units.


Capping the MailboxStep 6: Capping the Mailbox

Finish with 12 caps (two layers, as shown). Once you have all 8 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 4 caps for the second cap layout (as
shown) to complete the column.