20
WHEN YOU ABSOLUTELY CANNOT THRU-BOLT
Porter’s only approved anchoring methodology is a positive connection, i.e. thru-bolting a
wall, augmented with a minimum 1/2” diameter anchors with the proper embed length per
the anchor manufacturer, or chain support secured to the overhead structure. Should such
a condition not be available (thru-bolting), it is recommended the architect or structural en-
gineer be contacted for and anchoring specification. The project specific installation draw-
ings indicate the attachment locations for your particular backstop. Detail “B” gives the rec-
ommendation for thru-bolting locations, with the remaining attachment points approved as
anchors only.
There is a multitude of new anchor technology being brought to market each year, but
none are substitute for a positive connection. Although newer and heavy-duty toggle bolts
are now available,
Porter will not allow the use of toggles!
The diameter and strength
of the toggle pin, plus the fact the toggle is expanded (typically) in the cavity of the CMU,
yields the toggle application suspect, at best. Should there be any spalling of the CMU
cavity wall, the wall thickness and strength of that wall are significantly diminished.
An alternative to thru-bolting sometimes specified by architects is the use of adhesive an-
chors. It is imperative the when selecting and installing an adhesive anchoring system, the
anchor manufacturer’s instructions are explicitly followed. Failure to do so will provide an
unsafe installation. Following is only a brief, general guideline of installing adhesive an-
chors. Each manufacturer of adhesive anchors provides detailed selection and installation
instructions. Companies such as Hilti® provide technical assistance and information re-
garding these products.
ADHESIVE ANCHOR INSTALLATION GUIDELINES
(Follow Anchor Manufacturer’s Specific Instructions)
x
Wear safety glasses, gloves, and have a rag ready to wipe off excess adhesive.
x
Follow the manufacturer’s edge distance guidelines before drilling holes near windows,
doors, etc.
x
For hollow CMU, Porter requires both walls of the block to be drilled, utilizing the integ-
rity of both walls for anchoring.
x
Select the proper size bit per the manufacturer’s instructions. Caution: Porter recom-
mends a minimum 1/2” diameter anchor. The depth of the block may dictate a 3/4” di-
ameter anchor per the adhesive anchor supplier. Typically, an 8” deep block requires
and 10” screen and 1/2” diameter rod, while a 12” deep block requires a 13” screen
and a 3/4” diameter rod.
x
Do not use a hammer drill (to reduce the risk of spalling the CMU walls).
Summary of Contents for 219 Series
Page 49: ...INSTALLER NOTES...
