Installation Guide

Roadside Mailboxes – 4325
Bolt Mounted Post Installation Instructions
U.S.P.S. APPROVED
Installing the Bolt Mounted Post for the Mailbox onto
Anchor Bolts
When you install a curbside or roadside mailbox, make sure that it is
easily accessible to the mail carrier. By regulation it should be 41” to
45” from the ground or street surface up to the inside floor of the
mailbox. The door should be set back 6” to 8” back from the front
face of the curb or the road edge. However, you should check with
your local postmaster to ensure that the mailbox is installed
according to local regulations.
Dig the hole for the concrete footing, and prepare the concrete. You
will need approximately 4-1/2 cubic feet. The top surface of the
footing should be about 12” by 18” and extend 36” into the ground.
See the illustration for the relative position of the rectangular footing
to the post and mailbox. The bottom of the hole for the concrete
footing should be filled with about 6” of gravel to promote drainage
under the post. The top of the footing should be sloped for water
runoff.
The concrete must be below the frost line. Otherwise the post will
move when the ground freezes. Be careful not to puncture water,
sewer, or gas lines when digging holes for footing.
Four (4) 1/2”-13 by 8” long J-shaped anchor bolts and eight (8) 12”-
13 nuts are provided. Attach the anchor bolts to the base of the post
with four (4) nuts under and four (4) nuts over the bottom mounting
plate. Pour the concrete into the hole, prodding the mix with a stick
while filling to reduce any air pockets. Press the anchor bolts on the
bottom of the post into the concrete until the bottom plate is resting
on the top surface of the wet concrete. Use a carpenter’s level on
the sides of the post to ensure that the post is aligned vertically.
Periodically check the vertical alignment of the post as the concrete
is curing.
The concrete will shrink as it hardens, leaving a space between the
anchor and the concrete when it is cured. To prevent this, loosen the
top bolt one full turn prior to inserting into the wet concrete. After the
anchor is inserted into the wet concrete, place your foot on the top of
the threaded anchor and push down until the top nut is pressed
against the anchor plate. After the concrete has hardened, re-tighten
the top bolt.
SALSBURY INDUSTRIES
1010 East 62
nd
Street, Los Angeles, CA 90001-1598
Phone: [phone] Int’l Phone: [phone]
Fax: [phone] Int’l Fax: [phone]
Installation instructions are provided as general guidelines. It is advised that a professional installer be consulted. Salsbury Industries assumes no product assembly or installation liability.
Copyright © 2010 Salsbury Industries. All rights reserved.