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Proto II Wall Systems TM PostTensioned Masonry Proto II™ Fence Wall System Proto II™ Retaining Wall System Proto II™ 4-I
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Proto II Wall Systems TM
Post Tensioned Masonry
Proto II™ Fence Wall System Proto II™ Retaining Wall System Proto II™ 4-Inch Interior Fence Wall System
An Established Presence
Advantages
Post-tensioning of concrete has been in use for more than fifty years, and is commonly employed as a means to maximize the loading capabilities of concrete elements. Post tensioned concrete is typically employed in parking structures, office buildings, and many other structures where service loads are substantial. Residential builders are familiar with its use in floor slabs.
Fence, Retaining, and Combination Wall Designs. The
The specific application of post-tensioning to Proto II™ fencing has been in use for more than twenty years, and utilizes the internationally recognized benefits of posttensioning concrete and masonry structures. It is not new, it is not experimental.
variable pricing of grout/concrete. Proto II™ on average
Proto II’s adaptation of this technology provides a site wall unlike anything obtainable with conventional masonry methods, or other less-durable, flimsy, or even toxic fencing options. The facts are clear, Proto II™ is the most logical choice for specified fence walls. You’ll find Proto II has solid engineering, unequaled performance, well-deserved steady growth in the marketplace, and many ancillary benefits uniquely its own.
tremendous flexibility of Proto II™ is shown in standard design sets for post-tensioned fence walls, post-tensioned retaining walls, hybrid retaining walls of post-tensioned and grouted sections, and combination walls of all the above.
Minimized Cost Volatility. Protect yourself from the highly consumes 50% less grout/concrete than conventional systems. By far, the most price-stable material used in masonry fencing is the concrete masonry unit. Proto II™ has greater than 60% of its weight in cmu, and less than 40% in concrete.. Conventional walls are just the inverse - 60% is grout/concrete, only 40% of its mass is cmu.
Higher Strengths. The post-tension method yields much greater strength from system materials through active compression of the entire structure - all components act as one.
Thinner Walls. With higher structural values, less structural material is needed than required by conventional grout/rebar methods to accomplish the same end.
Proto II™ • • • • • • • • • • • •
Will not burn Will not melt Will not release toxins or volatile gases when heated Will not warp Will not degrade over time Is the most environmentally friendly from cradle-tograve of any other system Has the lowest embodied energy Has the greatest lifespan of any fence material Uniquely offers lower cost AND greater strength Is more likely to resist catastrophic forces than any other system Is more likely to be repairable after catastrophic events with minimal, if any, material replacement Uses standard ASTM C 90 cmu, so outward appearance is typical concrete masonry
Smaller Footings, Less Dirt Displacement. Proto II’s design includes footing options that can greatly reduce the amount of digging, dirt displacement, and concrete consumption compared to conventional walls.
No Rebar and Grout Required. Conventional walls depend upon the passive combination of rebar and grout. Proto II™ uses the controlled, active method of post-tensioning to create structural integrity. The elimination of the grouting process saves considerable time and cleanup.
Standard Plan Status Proto II™ has been approved by an extensive number of cities and counties, including the City of Los Angeles: Standard Plan #520 for Proto II™ Fence Walls Standard Plan #508 for Proto II™ Retaining Walls
Standards Concrete Masonry Units
ASTM C 90
Reinforcing rebar and tension rods
ASTM A 615
Plate washer steel
ASTM A 36
Tensioning nuts - Grade 8
ASTM A 325
Direct tensioning indicator
The Engineering Resources of Proto II™ Everything about Proto II™ is exceptional, including the formidable team dedicated to providing everything you need for submittals, details, site-specific custom engineering, and general assistance.
• • • •
ASTM F 929 testing procedures
Joint reinforcement
18 Independent, Licensed Professional Engineers 40 Engineering Technicians 16 AutoCAD Drafting Technicians 10 Administrative Support Personnel
ASTM A 82 ladder With such resources, turnaround times for engineering packages are
type, 9 gage
outstanding:
• •
Basic Fencing w/ Minor Retaining: 1 - 3 Workdays Retaining Walls: 5 - 7 Workdays
With the expanding move toward digital documents, turnaround times can be faster yet. No competing fence wall system can begin to approach the experience, efficiency, or depth of engineering capabilities dedicated to Proto II™ Wall Systems.
The Environmental Benefits of Proto II™ Exterior hardscapes are not often in the general discussion for “green” building, but the impact should not be overlooked. The extensive site improvements of today’s communities create opportunities for environmentally responsible design, in terms of both carbon footprint and healthy surroundings for those living in them. Embodied Energy: Measures the total energy expended for the complete lifecycle of a material, from raw material extraction and transportation, to production processes, delivery, use, and finally, end-of-life disposal. Concrete masonry fencing has very low embodied energy compared to other systems, and Proto II™ has less still since walls are not grouted.
Lifecycle costs are excellent. Masonry’s durability and lifespan exceeds that of any other fencing system, requires minimal to zero maintenance. Further, Proto II™ is extraordinarily repairable without necessarily having to replace the entire wall, thereby saving monetary and energy resources.
Embodied Energy (MJ/kg) Proto II™
Conv’l Mas.
Vinyl
1.27
1.33
70.00
Proto II™ materials are inert, and will not leach, outgas, or release toxins with contact.
Proto II™ walls will not burn or melt, and will not release toxins when heated. Proto II™ footing designs minimize soil displacement, and may eliminate the need to dispose excess soil offsite, saving collection and transport energy and expense. Environmentally sensitive areas benefit from such small footings by minimized disturbance to the adjacent environment. All Proto II™ materials are sourced and manufactured within 500 miles of projects in our market area, qualifying for regional materials LEED points. CMU used in Proto II™ are available with recycled content.
Fence Walls The Proto II™ Wall System demonstrates simplicity of design A direct tension indicator (DTI), (4), provides an alternate confirmation of achieving specified tension; tabs on the DTI will collapse when correct forces are attained.
achieving efficiency and strength. Wall compression attained from specified post tension forces creates outstanding structural
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integrity; stronger than conventional masonry, yet with the ability to flex without failure under code specified wind and seismic
consists of high strength steel tension rods (1) “L” hooked under a single rebar (2) in the footing, a 1/4" steel plate washer (3), direct
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45 3
loading.
The basic Proto II™ system
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tension indicator (4) and tensioning nut (5), and joint reinforcement (6) at specified locations. Walls over 6 feet in height may have additional requirements.
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Four footing types accommodate a variety of site conditions: Dip Footing uses a setting pad (7) spanning a series of “dips” (8);
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The end of the tension rod hook has a widened cross-sectional area that provides exceptional pull-out resistance.
Trench Footing (9); Pier Footing (10); and Spread Footing (11). Cmu conforming to ASTM C 90 are used in the construction of Proto II™, so the completed wall will look like traditional cmu walls in every respect, including available face textures in precision, split, and Slumpstone™.
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5 Foot to Daylight 2:1 Slope
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Standard Proto II™ footings in Dip Footing or Trench Footing design meet the 5' to daylight requirement without increased footing depths or buried block (12), - first course is at or near grade. The amount of soil displaced can be one-third to one-fourth that of conventional footings with a corresponding reduction in concrete volume, resulting in significant savings.
Retaining
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Measured in terms of “low soil” to “high soil” (13), Proto II™ walls are engineered with retaining capabilities in the basic wall design: • 6" wide retains 2' 0" • 8" wide retains 2' 8". Engineering is also available for conditions that exceed the base design, including combinations of retaining walls for lower courses and Proto II™ for upper courses.
Fence Walls - 4-Inch Interior They weren’t designed for this, but... Below are two fascinating examples of Proto II's performance in, needless to say, very extreme conditions!
Proto II™ innovation for interior masonry fencing Proto II™ Wall Systems offer the perfect masonry alternative to low cost, inferior systems in interior B@85 applications. The safety, durability, and marketability of a masonry fence at a price competitive with vinyl.
This 6' 8" high, free-standing Proto II™ perimeter fence in Indio, CA was designed for a non-retaining condition.
By utilizing a stocked, off-the-shelf 4-inch wide concrete block
However, strong winds piled sand against one side of the
in stocked gray and neutral tan colors, similar to vinyl
wall; in some places, over its top! Of 1200 l.f., 97% held under the enormous retaining load, standing undamaged and in tension.
availability, Proto II™ installers can harness the efficiency of Proto II™ post-tension to deliver an interior lot-separation masonry fence competitive with vinyl fencing.
Applications Wind driven sand piled up on one side of this standard, non-retaining Proto II™ fence.
• Wherever vinyl fencing is used • Typical 6-foot high • B@85, typically interior separations waslls
System • Proto II™ post-tension design and installation • 4-inch wide wall with morterless head joints for high productivity; mortar only needed for bed joints The opposite side of the fence section shown above.
• Professionally engineered to provide the durability and wind resistance equivalent to wall 6-inches and more in width • Far superior to vinyl in durability, safety, and markebility • Long-term benefit to the homeowner • Enhanced marketability for the builder
Materials In another California desert location, La Quinta, powerful winds again provided a challenge to Proto II’s structural
• 4x8x16 Proto II™ Tongue & Groove cmu pecision normal weights unit
integrity. Swirling around the end of the wall, winds
• Stocked in natural Gray and Proto Tan colors Note: To keep costs as competitive as possible, special order colors are not available (similar to low-cost vinyl fencing)
undermined approximately eight feet of the fence - footing and all! Proto II’s high strength tension forces held the entire structure together without any sagging or cracking.
• Proto II™ hardware
Comparisons Proto II Masonry Fencing*
The installer climbed out to the end of the wall and verified proper tension was maintained.
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Safe, non-toxic
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Fire-resistant, no toxins released when heated
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All materials completely recyclable
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Material sources are local with very low embodied energy
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Strong, impact resistant
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• •
Pets cannot dig under fence and footing
Vinyl Fencing*
• • • •
• •
Numerous studies indicate persistent toxicity
Releases hydrochloric acid and other deadly gases at less than ignition temperatures Difficult and costly to recycle; contaminates other easily recyclable plastics
Chemical components for vinyl not local; extremely high embodied energy
Low impact resistance; must protect from normal outdoor activity
Very easy to dig under panels
Excellent noise attenuation
•
Minimal noise attenuation, gaps in fence
Appearance and stability of masonry, but cost comparable to vinyl
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It is what it is: plastic
*See Lot Separation, 4-Inch ProtoII™ and Vinyl: a Holistic Comparison
Retaining Walls The Proto II™ Retaining Wall is a patented design utilizing the
Savings
same post tension approach found in the fence system, but
• Minimizes footing size.
optimized for retaining conditions. Materials and basic
• Can eliminate wide backcuts.
construction methods are essentially the same as used in Proto II™ fences, making the two efficiently compatible.
• Eliminates grout inspections. • Eliminates jurisdictional inspections. • Eliminates cure time for grout. • Immediate backfilling after tensioning. • With the draining capabilities of the non-grouted Proto II™, waterproofing may be optional. Speed • No grouting of masonry; eliminates coordinating inspections, pumps, concrete. • No grout means no grout cure time. • Backfilling can occur immediately after full tensioning of rods. • Tongue and groove units may be used, eliminating head joints. Construction • Efficient footings, minimized size - continuous trench, post and beam, or spread. • Continuous trench design accommodates property line conditions. • Minimal backcuts required for trench footings • Mortarless head joints, weep holes, or drains may be used. • Top course is a bond beam for cap tightness and anchoring of fence walls above. Mortar may be used for the grout. • View walls, such as wrought iron or glasswalls may also be attached to the top of a Proto II™ retaining wall.
Retaining Walls Basic Designs Proto II™ engineering covers wall combinations for level backfill and 2:1 slope. Engineering is available for most site conditions. Shown are typical scenarios.
Drain installed.
Bond beam at top of Proto II™ retainer
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Typical Proto II™ posttension rod connection to 8-inch wide footing, flared at top for proper coverage of rebar. Depth per product drawing schedule.
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Proto II™ Fence tension rod connection to Proto II™ retainer below
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Typical 12-inch grouted retainer connection to 12-inch wide footing, flared at top for proper coverage of rebar. Depth per product drawing schedule.
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Proto II™ retainer connection to grouted 12-inch retainer below
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Optional 12-inch thick spread footing shown with upper rebar for fence wall on top of retaining wall. Width per product drawing schedule.
With no grout in the Proto II™ PostTension Retaining Wall, water flows freely through the wall. Drains, weepholes or mortarless head joint cmu may be used. Only one cubic foot of gravel behind drainage is required at intervals indicated on product drawings, unless otherwise specified in the soils report.
Total combined height of 17'4" achieved with typical engineering.
Proto II™ Post- Tensioned Masonry Retaining Wall
Proto II™ Post- Tensioned Masonry Retaining Wall
3 2
1
Proto II™ Post- Tensioned Masonry Retaining Wall
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design by Proto II™)
design by Proto II™)
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Grouted 12-inch Masonry Retaining Wall (Exclusive, efficient
Grouted 12-inch Masonry Retaining Wall (Exclusive, efficient
Proto II™ Post Tensioned Masonry Retaining Wall
Proto II™ Post-Tensioned Masonry Fence
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1
Proto II™ Post- Tensioned Masonry Fence
Weep holes or mortarless head joint cmu
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4 5
7 7 Pure Proto II™ Post- Tension Retaining Wall No grout or rebar in the masonry retainer.
Pure Proto II™ Post- Tension Retaining Wall with Proto II™ fence on top No grout or rebar in the masonry retainer or fence.
Pure Proto II™ Retainer on Top of 12” Grouted Retainer No grout or rebar in the Proto II™ portion; efficient design of grouted portion.
Pure Proto II™ Retainer on Top of 12” Grouted Retainer with Proto II™ fence on top No grout or rebar in the Proto II™ retainer portion or fence; efficient design of grouted portion.
FAQ Q: Are post tensioned walls less advanced than proprietary conventional
resist extreme forces without the fatal cracking of a brittle
designs?
conventional system. Should, however, catastrophic events damage a
A: Conventional masonry fence systems incorporate static rebar and
Proto II™ wall, it can more likely be repaired without rebuilding the masonry, and in nearly all cases the footing and tension rods are
grout for structural integrity. Whether referred to as “traditional” or
untouched and completely reusable. In fact, one of the benefits Proto
called by a supplier’s house brand name, it is still conventional and
II™ gives the builder in marketing to prospective buyers is the
far from a logical evolutionary step forward. It is in fact
capability to completely take down a wall to allow temporary access
devolutionary in that the new marketed designs are simply down-
for construction equipment. This is incrediblyconvenient for pool
sized from the “traditional” walls. The noteworthy thing is, it took
construction. Rods can be bent to the ground, and then straightened
Proto II™ to demonstrate that more efficient methods were possible.
to rebuild the wall without disturbing the footings – absolutely not
The downsized conventional systems were nothing more than a
possible with conventional walls.
reaction to lost market share.
Q: Does Proto II have acceptance by cities and counties?
Q: Since a post tensioned wall is hollow, must installation crews receive
A: Proto II™ has been given approval by an extensive number of
special training?
cities and counties, and has Standard Plan status in many areas
A: Conventional designs themselves are only partially grouted, with mostly hollow cells. Standard cmu contain hollow cells and is not a training issue.
Q: Is there less margin for installation error with post tensioned masonry?
including the City and County of Los Angeles, two departments known for rigorous requirements and acceptance criteria.
Q: One supplier claimed to have an on-staff engineering department, what about Proto II? A: A one-man “department”, compared to Proto II’s patented design
A: Every design, conventional or otherwise, takes into account a
supported by a team of seventy professionals.
certain “margin for installation error”. No installation of any system
Q: Is there a premium paid for patented special hardware and components?
or material has ever been or ever will be “perfect”. Further, conventional systems have fewer margins for error since they are fixed, static systems where no further modifications can be made.
A: Proto II™ is a patented system, not just construction using patented parts. Either way, as long as a superior wall is built at a competitive price, what does it matter what the contractor paid for the
Q: What about steel corrosion and stretch, and no grout to protect and
materials? The bottom-line cost proves the logic.
maintain the steel?
Q: Would I have freedom to choose suppliers?
A: This has been a longstanding competitor claim, but after 20 years
A: Though the Proto II specification is source-specific, competitors’
no evidence has been offered to support it. All reinforcing steels used
house-brand designs are as well, and despite claims to the contrary,
in masonry construction can exhibit “flash rust”, a surface layer of
have been increasingly aggressive in enforcing that only their cmu are
hydrates of iron oxide. It’s normal, and has no effect on performance
used in a wall built with their branded details, even to the point of
of Proto II™, unlike conventional that depends on grout/rebar bond.
disrupting projects.
“Flash rust” is NOT corrosion – the destructive result of substances
Q: Some wall suppliers tout their system as approved by ICBO and using only ASTM approved materials; does that mean Proto II doesn’t?
chemically reacting with the steel. Conditions allowing such intrusions would affect any type of wall without protection on the
A: The “ICBO” they refer to is an Evaluation Report expired in 1997,
surface of the wall.
and based on the out-of-date 1994 UBC. ASTM does not “approve”
Q: If the top course is not under compression, are caps held in place with just
anything – they publish standards. See inside for the list of applicable
mortar?
ASTM standards for the materials in ProtoII™.
A: Yes, and that’s typical to all walls, including conventional.
Q: One conventional system claims it’s available in custom heights up to 16 ft; what about yours?
Q: Is only one source available for special materials and hardware? A: Yes, one source for post tensioning hardware, and a regional source for cmu. Single-source specifications are common. This does not impede the installer’s ability to bid competitively against other installers or systems.
A: Proto II™ has walls in place up to 22 ft high, freestanding, and performing nicely under direct hits from fierce Santa Ana winds.
Q: Do builders have greater freedom to select contractors with conventional vs. post-tensioned masonry? A: More professional production wall contractors install Proto II™
Q: Are post tensioned walls difficult to repair?
than actively promote any other system, period. And they have the
A: Not at all. The ability to repair damaged walls is one of its
choice of installing any system they choose. Given the exponential
tremendous benefits. Proto II’s ductile response to loading allows it to
growth in Proto II™, it’s clear the choice professionals have made.
Answers provided by Pyramid Builders Corp, owners of Proto II™ Wall Sysytems.
Angelus Block Co., Inc. [email protected] www.angelusblock.com
(818) 767-8576 (714) 637-8594 (909) 350-0244 (760) 347-3245
Proto II Wall Systems
For technical information, contact: TM
Gary Otto Proto II™ Wall Sysytems (951) 694-3793 [email protected] www.protoii.com