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Laying a wall-pass mailbox

Put a mailbox outside is not always a guarantee of security. Its watertightness is sometimes doubtful and besides, it is neither practical nor comfortable to pick up the mail when it rains. Opening an opening in a door or gate can alter its safety function and is not very aesthetic. On the other hand, to carry out the operation that we propose to you: to put a mailbox through a wall, is a much better solution.

Necessary material

  • Metre
  • Pencil
  • Mallet
  • chisels
  • Bubble level
  • pegs
  • Formwork boards
  • Shield
  • Float

Steps

  1. Drilling the wall and positioning the box
  2. Mortar casting and finishes

Drilling the wall and positioning the box

Tracing the opening to dig for the installation of the box

Tracing the opening to dig for the installation of the box

1. Trace precisely the limits of the opening. Plan to do it in height, double the thickness of the box to be able to work conveniently.
Depending on the type of expansion box, straight or offset (the inner exit is then lower than the outer entrance, which allows the mail to "fall"), plan the height of the inner opening. We chose here a straight expansion box that can be embedded in walls from 26 to 43 cm thick.

Delimitation of the opening on the plaster of the wall

Delimitation of the opening on the plaster of the wall

2. Start by "cutting" the line in the plaster and then attack the site by the center. The drilling is done here with the chisel and the hammer on a stone wall. But depending on the nature of the material (brick or breeze block for example), the help of a grinder can save time if you do not fear dust. Work then with a mask.

Upgrading the box's input

Upgrading the box's input

3. With the boring completed, position the outer face of the box on the base of the opening. Block and check its horizontality at the bubble level.

Checking the positioning of the box on the wall

Checking the positioning of the box on the wall

4. Also check that the front of the box is in line with the wall plane. Do the same with the expandable part of the box on the inside of the wall.

Laying the formwork on the inside of the wall

Laying the formwork on the inside of the wall

5. Close the inner opening with a formwork that you will hold on the wall with pegs. Use only good quality planks, well planed, to obtain a smooth plaster. Wet before pouring the mortar.

Mortar casting and finishes

Mortar filling of the contours of the box

Mortar filling of the contours of the box

1. Pour the mortar through the outer opening provided high enough for this purpose. It should not be too thick to close the spaces around the body of the box and its facades, nor too liquid to be smoothed outside without formwork. Use the shield as a support and push the mortar into the opening with the trowel.

Smoothing the plaster fittings on the outside of the wall

Smoothing the plaster fittings on the outside of the wall

2. Let the mortar "pull" a bit and then make a first smoothing with the trowel. Depending on the condition of the mortar draft, smooth dry or slightly moisten your tool. Perform the same operation on the inside of the wall, after removing the formwork. Lay the front of the box. You will have to fix on it (outer facade), the identity tag to make your mailbox operational. If necessary, finish smoothing.

Finished installation of the inner face (opening) of the box

Finished installation of the inner face (opening) of the box

3. This is the front of the mailbox visible inside the wall. Note the lock and the control window that allows you to see if mail has been dropped.

(photos / visuals: © DIY-Prod, except special mention)

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