Bell'O 8325 - Manual (Page 13)

English
When mounting to solid concrete, bricks, or cinder block
After you have determined your desired TV location, tape the Installation Template (IT)
in place securely on the wall with masking tape.
Use a level to double check that the screw holes line up vertically, as shown in Figure 8.
Figure 8
Do not drill into mortar joints! Mortar joints are in between the bricks where the
cement is. These joints are typically not strong enough to hold heavy loads.
You need to drill the holes at least one inch from the joint to provide adequate
strength. Use a standard drill with a new masonry drill bit to drill the holes. Do
not use a hammer drill because it can damage the hole or break out the back of
the concrete wall which will not give adequate support to the anchor.
Because drilling an accurate and clean hole is essential to securing your
mount, be sure to use a new drill bit. An old drill bit can not only make
an uneven hole, it can also break out the back of the concrete block
which can diminish the holding ability of the anchor.
Line up the installation template to ensure you’re not going to drill into any mortar
joints. Drill four evenly spaced holes 3" (76mm) deep using a 5/16" (or 8mm) size drill bit.
Follow the directions on the installation template carefully.
Concrete Block Wall IT
Level