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AutoTight® |
by
Commins
Manufacturing, Inc. |
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ROD HOLDOWN SYSTEM |
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Why Rod
Systems? |
The AutoTight® Rod Holdown System
outperforms traditional holdowns in every way.
Installation ease, capacity, cost and
performance.
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Installation ease: Traditional holdowns require a
floor to floor connection and a quantity of horizontal bolts.
Bolting requires the installer to drill a number of horizontal holes
into the studs and to counterbore the bolt heads. (See drawing at
the right). The top illustration shows the bolt head counterbored
into the studs. This operation is slow, costly and reduces the stud
performance. The middle Holdown connection shows the bolt head
against the stud surface. These installations are wrong because the
bolt threads are bearing against the wood at the point of maximum
loading and the bolt will interfere with the installation of the
vertical rod. The Holdown connection at the bottom is correct for
the bolt placement but the bolt threads interfere with the perimeter
of the shear wall. This is difficult connection. Average
installation time of 1 hour per Holdown! |
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Performance: consists of three elements, tensile capacity,
Shrinkage capacity and Deflection at rated load.
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Tensile Capacity: |
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AutoTight® load rating |
= 11,780 lbs. |
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HD 10A load rating |
= 9,900 lbs. |
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Shrinkage Capacity: |
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AutoTight® |
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= 1.1” |
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HD 10A |
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= None |
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Deflection at rated capacity: |
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AutoTight® |
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= 0.231” |
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HD 10A |
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= 1.224”. |
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The AutoTight® system is
5 times stiffer. |
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Installation Speed: |
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AutoTight® |
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= 15 minutes |
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HD 10A |
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= 2 hours + |
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AutoTight® installs 8 to
12 times faster! |
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Cost Comparison:
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Commins AutoTight®
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Traditional Holdowns
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Market Price: |
$ 61.46 |
$ 87.12 |
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Installation Cost ($36.00/hour) |
$ 9.00 |
$ 63.00 |
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Total Cost: |
$ 70.46 |
$ 150.12 |
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AutoTight® - Stronger,
Stiffer, Faster: There is no comparison. |
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Download -
AutoTight® vs. Traditional Holdowns.pdf
- (1 page, 120k)
Acrobat Reader
is required to view the
material.
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Contact
Webmaster with questions
or comments |
Copyright 2005
Commins Manufacturing, Inc., Friday Harbor, WA 98250, Tel (360) 378-9484 |
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AutoTight® Rod Holdown Systems and components are covered by one or more
of the following U.S. Patents 6,390,747; 6,585,469; 6,625,945, other
patents both foreign and domestic are pending. |
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