QuickTie vs. Conventional Hardware vs. Rod Systems
|QuickTie™||Conventional Hardware||Threaded Rod|
|Quality||- Tension is maintained post-install, in essence “cinching” the structure to the foundation with constant, lasting pressure|
- Exhaustive and established lab and shop testing of fully assembled components
- Self-testing post-install, as strength builds when concrete further cures
- Distinct state product approval
|- No solution for wood shrinkage and building settlement|
- Straps buckle, possibly causing stucco cracking and water intrusion.
- Finish blemishes when mounted to sheathing.
- Plethora of nails damage the studs
|- No natural solution for wood shrinkage and building settlement (take up devices required)|
- No product approval – rod is not product; it is a fabricated commodity
- Questionable country of origin and history of quality problems
- Unfinished rod shows rusts and can inhibit effectiveness of epoxy bond
|Value||- Diversity: utility in single and multi-family construction|
- Simplicity: less material for more uses to resist both overturning and uplift forces
- Service: guaranteed quotes and signed and sealed engineer drawings
- No expensive take-up devices required
- Exhausting. Part and pieces are endless. Various type of hardware is required for the various forces necessary to resist.
- Laborious: the time and energy required to install is costly
|- Expensive take-up devices required to account for wood shrinkage and building settlement.|
- Reliant on the value-add of services (design and installation) not inherent in the product itself.
|Effciency||- Installed after framing with simple,quick methods|
- Fewer, easier inspections
- No nails. No tricky, long and unworkable stiff rods
-Few tools needed.
- Flexibility on plumb tolerance adds to ease of installation.
|- Multi-step process before, during and after framing.|
- Specific nail lengths and shanks required – hard to keep up with and verify
- Heavy machinery for outside of the building components may be required
- Little flexibility on tolerance
|- Difficult to work with; can be greasy|
- Bent rod must be culled and not installed
- Embedment depth cannot be verified
+ Engineering & Design
- Easy to use load tables correlate QuickTie anchor spacing directly to uplift reactions of trusses without requiring additional computations.
- The QuickTie is a single assembly from the top of the top plate to the foundation, providing a simple, unbroken load path for all uplift loads.
- Fewer system components means less computations required
- Since QuickTie’s are placed at variable spacings related to truss uplift reactions, they can be readily installed at optimal spacing as opposed to conventional systems which are generally selected for all locations using the most severe load case.
- The QuickTie system has no connections directly to the studs. Therefore, strength reductions in capacity of the system due to stud lumber selection is not necessary.
- End-of-shear wall hold-downs and hold-downs required at uplift load concentrations such as beams and girders. QuickTies handle both forces, and there is no need to have multiple systems for one building.
- QuickTie load table allowable loads are typically controlled by applying a safety factor of 3.0 to the ultimate (failure) load of the wall. The actual total maximum upward deflection at the mid point between the anchors at this load level is always less than ¼ inch and typically closer to 1/8 inch. This can be very favorably compared to the total aggregate movement potential of all of the stressed components in the load path of more conventional systems whose individual allowable load criterion generally allows 1/8 inch of movement for each component.
- The QuickTie system has undergone extensive, full scale testing under combined uplift and in-plane lateral shear loads. In comparative tests, the lateral movement of the QuickTie pre-stressed cable system performed equal to heavy conventional hardware and had less movement than a threaded rod anchor system!
- The QuickTie system is more efficient and cost effective in part because it utilizes the strength of the sheathing to distribute the truss uplift forces along the wall to the QuickTie anchors. This results in wider spacing of anchors which, in turn, results in both material and installation economy.
+ Performance Assurance
- The QuickTie system has been tested in full-scale wall uplift tests providing a higher level of confidence in system performance than systems where only individual system components have been tested.
- The primary component of the QuickTie, the wire rope, is subjected to considerable testing to assure that the performance characteristics are completely understood and established. Cables are tested for:
- Elastic force/stretch characteristics
- Inelastic constructive stretch and relaxation characteristics
- Furthermore, swaged samples of the wire rope/swage assembly are tested regularly as part of our quality control program.
+ Installed Performance
- Since every QuickTie is pre-stressed to approximately 130% of its design service load (under hurricane conditions), they are 100 % “proof” tested. This assures the structural integrity of the wire rope/swage and also the epoxy anchorage of the stud end in the concrete foundation.
- Since “proof” testing usually occurs at an early age of the concrete, the stud anchorage in the concrete will only get stronger with age.
- Pre-stressing the wall with the cables tightens up the wall systems, eliminating construction gaps in stud/plate fit-up. This means that as added dead and live loads are imposed on these walls, they will have significantly less wall shortening as the building ages.
- Similarly, this is the only system that acknowledges potential shrinkage of the lumber by including an allowance in the calculated “stretching” of the cables to assure that the desired pre-stressing is still there after shrinkage. Less future movement means less drywall problems.
- Since the QuickTie anchors are pre-stressed, movement, at loads approaching the design service load, produces minimal movement at the QuickTie locations. The tensioned Quick Tie cable, in essence, acts like a very stiff “spring” clamping the building together from the top plate to the foundation with enough “stretch” in the spring to continue functioning even with some relaxation and building shrinkage losses. And testing verifies that between intermittent loads this clamping action re-establishes the tightness of the wall as opposed to conventional hardware that might “work” itself loose with repetitious loads.
- At ultimate loads, the QuickTie system “failure” typically is the result of the failure of the sheathing/nailing which is gradual as opposed to more abrupt failures which could be associated with component connectors.
- Fewer, easier inspections:
- Tension in the cable can be readily identified by touch to assure that each cable has indeed been pre-stressed
- The required stress in the cable can be easily determined by measuring the amount of thread visible at the top plate and comparing it to the required elongation on the QuickTie cable tag.
- Any deficiencies in the performance of the stud anchor epoxied into the concrete can be identified by slippage and excess amount of the stud exposed above the sole plate.
- Fewer components mean fewer items to inspect.