InTents August/September 2019 - 37

re lect the loads that are placed on the tent. Consult
your manufacturer if you have questions regarding
the loading factors that are placed on the tents
that you own. This clears any confusion as to the
loading factors required with the ballasting tool.
Maintain a chart of the different ballasts you use
so that you can place the correct dimensions to get
accurate, recommended ballasting information.
Reyen: The ballast study is a conversion tool, taking
the amount of holding power that the manufacturer
has determined is required in a staking application
and converting it into weight. There are a lot of
variables-surface modi iers, different types of
ballast. . . . The manufacturer won't be able to tell
you how much ballast to use, but they should be able
to tell you the required holding power to meet for
whatever speci ic wind rating you are looking for.

SUCCESSFUL STAKING
What are the common mistakes
that cause tent stakes to fail?
Tharpe: Stakes fail when they can no longer resist
the tension/frictional forces holding the stake into
the ground. Soil type, soil density and the moisture
content of the soil greatly affect the stability of
the stake. The end results in the sideway force
that is greater than what the soil can hold back.
This causes the soil to bulge, and then the stake
loses its frictional hold. There are several factors
that can affect the soil's resistance to failure:
* The deeper the stake is driven into the ground,
the better the holding power and the greater the
soil wedge that resists the stake from moving.
* Attachment point: the lower the attachment
point of the guy, the greater the holding power.
* The larger the stake diameter, the greater
the holding power. This creates a much
larger and tighter compacted soil zone.
* Stakes driven straight into the ground provide
greater holding power and create a larger soil
wedge for greater resistance to the soil for moving.
* The angle of pull can affect holding power. Pulling
too close to the side pole will cause the stakes to
be easily lifted out of the ground, while the angle
of pull too far will cause the side poles to be lifted
off the ground. Once the stability of either of these
items are lost, you are on your way to failure.

ANCHORING RESOURCES
IFAI Staking Study
The IFAI Staking Study produced a user-friendly
method to test the holding power of stakes to
meet the manufacturer's required anchoring
loads. With this simple test, installers, sales
people and code officials have access to the
same information. The test is described in the
"Pocket Guide-Pullout Capacity of Tent Stakes,"
first published in 2006.

TRD Ballasting Tool
The Ballasting Tool is an online calculator that
resulted from a study completed by TRD with the
Clemson University Department of Engineering,
Clemson, S.C. The tool helps tent rental companies
determine the best methodology for using
ballast units to anchor frame tents and clearspan
structures and determine the expected mean
coefficient of friction for different common types of
ballast on a variety of surfaces.

IFAI Procedural Handbook for the Safe
Installation and Maintenance of Tents
and Fabric Structures
The Procedural Handbook is a living document
of information on how to execute safe and
quality tent installations. The document includes
information on site survey, layout and anchoring
(including the staking study data summary), poles,
tensioning, sidewalls, and safety and maintenance
for a variety of tent styles. The handbook was
significantly revised in 2017.
TRD members may download the Pocket Guide
and the Procedural Handbook and access the
ballasting tool at the "Resources" dropdown
menu on the TRD website, www.ifai.com/tent.

www.InTentsMag.com

37


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InTents August/September 2019

Table of Contents for the Digital Edition of InTents August/September 2019

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InTents August/September 2019 - Cover2
InTents August/September 2019 - 1
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