Home ImprovementU Do ItVideo

How to Install a Mailbox and a New Mailbox Post

In this video I show you how to install a mailbox on a newly installed mailbox post. How high should you install it? There are regulations published by the USPS on how high to install a mailbox. It also states how far back to install a mailbox from the curb. This requires measuring the height from the ground to the mailbox so that it should fall within the 41 inches to 45 inches. The mailbox I install in this video is rather large so I choose to install it at 38 inches. The position of the mailbox should be setback 6 inches to 8 inches from the curb or sidewalk. This is a newly installed post. I created a video on how I installed this post and I will provide a link to the video once it is available.

To install the mailbox I must first install a crossmember. I do this using the same wood by joining them together using a cross-lap joint.

USPS Mailbox Installation Guidelines

USPS Mailbox Installation Guidelines

Video Chapters

0:00 Intro
0:09 Follow the measurement guidelines set by the USPS
0:15 Measure the crosslaps
0:36 Cut out the crosslap joint on the post
1:51 Measure and cut the crosslap joint of the cross member
2:55 Install the crossmember onto the post
3:29 Cut a 2×8 for the the mailbox mount
4:04 Install the mount onto the crossmember
4:21 Secure the crossmember on the post with lag screws
5:27 Mount the mailbox onto the mount

The Tools Used to Install a Mailbox

List of tools and materials for mailbox replacement and installation: https://amzn.to/3xE24Ud

  • Wood saw
  • Combination square or speed square
  • Tape measure
  • Drill and drill bits
  • Driver (preferably an impact driver)
  • Right angle driver attachment and torx bit for construction screws

Materials

  • Mailbox
  • Construction Screws
  • Deck Screws
  • 6 x 6 post or 4 x 4 post

Mailbox Installation

I determine the topmost height of the cross member by determining where I want the bottom of the mailbox. Once I determine this I mark two horizontal lines outlining the top and bottom where the cross-lap joint will be made. In this case that is 5.5 inches since I am using 6 x 6 pressure treated lumber. I then cut into the wood 2 3/4 inches, which is 1/2 of 5.5 inches. On my cross member I decide where I want it to join on the post and I cut the same thing out on that. I join the cross member into the post, drill out holes for the construction screws and then install the construction screws which secures the cross member to the post.

With the cross member installed I install a 2 x 8 piece of wood on top of the cross member where the mailbox will be installed. I predrill the holes on that 2 x 8 so I know where the holes of the mailbox will be. That way, when I install that 2 x 8 on top of the cross member I know where not to put screws that would prevent me from installing the screws to secure the mailbox. Then I install the cross member and install the mailbox.

Safety First

You are responsible for following safe practices when working. Safety is a mind set that needs to be applied to all areas and not just while using tools. Yes, tools can be dangerous but you can also trip on items on your work area. If you feel uncomfortable with any of these steps it is recommended that you consult with a licensed handyman or licensed general contractor.

If you are interested in other U Do It™ articles you can see them here.

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