This section is dedicated to giving you answers to frequently asked questions about TripStop and the many things that relate to the way concrete reacts to movement, whatever the cause. Movement can be caused by tree roots invading, soil swelling uplifting slabs, thermal expansion or soil subsiding or a combination all causing concrete slabs to become misaligned/displaced. If it moves once what are the odds that it will it move again? In areas where you have TripStop you wont have to worry about displacements, grinds, asphalt wedges/ramps or replacements again. Areas prone to movement without TripStop are another story. Who knows what trees will be planted into the future, by Council or a home owner or where they will be planted.

Please search our site using the 'search TripStop' function or browse through this area for your specific questions. If something you want to know is not listed here, or something needs more explanation or needs an edit please contact us for a quick response. If you want to ask me a specific question feel free.

Peter Mclean

FAQs

  • What is TripStop? +

    TripStop is a Patented PVC extrusion that is installed in wet concrete to connect two pieces of concrete to form a hinge joint. TripStop stops concrete pavement displacement problems and the resulting trip hazards. TripStop segregates the slabs into two totally distinct units which stops mid panel and random slab cracking. TripStop allows concrete to articulate or hinge and accommodates significant soil movement and tree root invasion with ease. TripStop delivers substantial cost [less repairs and replacements], environmental [less waste and less CO2] and 100% safety [no trip and fall] benefits.

  • How much does TripStop cost? +

    It’s a whole lot cheaper than replacing the slab!

    Think of it as an insurance policy against future slab displacement and all the resulting on costs. 

    As an example of cost versus expenses.

    Depending on how much you order if it was a single box of TS100S x 3.0 being for a 3.0 wide concrete cycle way 100mm thick the cost of TripStop would be $43.50 a joint [as at Oct 2016].

    Versus costs to remove each displaced panel of concrete, the cost of logging/back office of the site, removal of concrete etc, cost of the replacement concrete and the installation and re-hab costs. Other costs might be doctors and hospital costs if someone falls and possibly legal costs. Other savings are not polluting with CO2. 

    How much does each slab cost you every time you replace it? An average is around $100 per square metre of concrete laid. This means each 3 x 3 metre slab costs at least $900. Versus a cost of $43.50 plus instalation costs to protect that single 3 x 3 metre slab with TripStop. 

    $43.50 VERSUS $900. ITS A NO BRAINER.

    A ball park cost to install TripStop is about the cost of one intervention such as a Grind.

    [Installation costs range from $Zero to ar $10 a joint max.]  

    Ask your local Sales Agent or email us This email address is being protected from spambots. You need JavaScript enabled to view it.This email address is being protected from spambots. You need JavaScript enabled to view it."> for a quote.

  • How do I order TripStop? +

    Email This email address is being protected from spambots. You need JavaScript enabled to view it. and you will be assisted with the details.

    What we need to know is how thick, how wide and how long the path is to be able to quote you. 

    To make sure you get your product on time we suggest place your Purchase Order earlier rather than later.

  • Is TripStop Cost Effective? +

    It depends on how often maintenance such as grinds/slices, asphalt ramps or wedges and in the end replacements happen. In extreme areas that are eventually replaced less than 5 years we can show you cost a Cost Benefit Analysis that in every case it makes $ sense to install TripStop EVERY time. In other areas not so extreme the debate rages. In new areas / sub- divisions it makes sense to specify it to developers to install TripStop in all footpaths. That way Council inherits a maintenance free footpath. Depending on the width of the block on average adding TripStop to the footpaths will cost the developer ar $100 - $200 a block extra.

  • Is TripStop guaranteed? +

    Yes. Contact us about our Guarantee.
  • Have you conducted a Cost Benefit Analysis or CBA [measured the cost v benefit] of TripStop? +

    Yes. We have done so many times. We have the classic ‘Bayside’ example backed with a testimonial on our website which shows a fantastic CBA. Instead of replacing it every 13 months they haven’t had to intervene or replace in over 13 years since it was laid in 2003. Now as at 2015 this is over 10 life cycles. 3 slabs per cycle x 10 = 30 slabs x $200 a slab = $6000 for an initial cost of $74. Thats a CBA of $81.08 to $1.00. Another Australian council using TripStop for well over 12 years has estimated a $10 payback within two to ten years for each $1 invested in TripStop when replacing slabs adjacent to trees with a history of aggressive tree root behaviour.
  • What does the end user get when they use TripStop? +

    A. They get a safe path that will last, a road that isn’t blocked due to concrete path repairs, peace of mind and the safety we all need.

  • What is TripStop made from? +

    An extruded special high strength UV stabilized, Lead and Cadmium [heavy metal] free Virgin PVC. PVC will handle aggressive alkaline [salty] conditions.
  • Is TripStop made from re-cycled materials? +

    No. Being an extruded product recycled PVC makes it impossible to achieve the strict tolerances that are needed to keep TripStop in tolerance.
  • Is TripStop affected by UV rays or Ozone? +

    No. The virgin PVC compound used to make TripStop is UV and Ozone stabilized. More so the working parts are deep inside the slab.
  • Is TripStop recyclable? +

    Yes. All PVC is. Virgin PVC even more so. As it is now when we extrude and it’s out of tolerance its re-ground and used again to make TripStop.
  • How much does each profile weigh per metre? +

    75X weighs 1.18 kg and 100X weighs 1.74 kg per metre.

    75S weighs .60 kg, 100S weighs .77 kg, 125S profile weighs .99 kg and 150S weighs 1.21 kg per metre.

  • How Is TripStop supplied? +

    TripStop is cut and drilled to order with whatever profile and length you desire [width of your path] with sufficient 6.3mm Galvanized Steel Pegs and height adjustable Plastic Wedges to do the install per box. Let us know what sort of soil you have on your site and we can advise you of the length of peg is best.

  • What is the lifespan of TripStop? +

    The lifespan of PVC and thus TripStop is measured in decades. Encased in concrete and buried underground it’s well protected. All facts point to the TripStop outlasting the engineered life of the concrete path.
  • Does TripStop manufacture the product? +

    No, TripStop is manufactured under license.
  • What are the deflection/displacement limitations of TripStop? +

    According to ASA standards the maximum allowed difference between pedestrian pavements is 6mm. 

    All our results were less than 6mm and passed ASA standards.

    These results are available as downloads on our website.

     

     

     

  • How many and how long have councils been using TripStop? +

    TripStop is 13 years old and has placed many hundreds of kilometres in well over 300 Councils/Cities in Australia, New Zealand, USA and Canada.
  • Who invented TripStop? +

    TripStop was invented by Australians Peter Mclean and Chris McClelland.
  • What sizes does TripStop come in? +

    TripStop is available in 75mm, 100mm, 125mm and 150mm profiles in off the shelf cut lengths of 1.0, 1.2, 1.35, 1.4, 1.5, 1.6, 1.8, 2.0, 2.4, 2.5 and 3.0.

  • How is TripStop installed? +

    A minimum of 3 steel pegs per piece are driven through pre-drilled holes and into the Earth to hold the TripStop in place during the pour. We supply the correct amount of Pegs and Wedges for each length in the price. The height is set via the supplied plastic wedges. There are down-loadable guides or download the Installation movie. In most cases it takes less time to install a piece of TripStop than do a troweled or diamond cut dummy joint. Time to place the piece of TripStop in the trench and drive in pegs may be 2 minutes apiece. A few minutes per piece to make sure the concrete is well packed around the joint. TripStop can also be used as a Screeding guide which is handy against fences. No need for any wooden depth markers.

  • How should I prepare the sub-grade? +

    Good engineering practice requires that the sub-grade be adequately prepared with compacted aggregate, and then wet prior to the pour. For best results the sub-grade should smooth and free of any irregularities. An aggregate base will not improve or hinder the TripStop efficiency. Some engineers specify the laying of a plastic membrane in the forms to eliminate bleeding of the water into the sub-grade.
  • How often should TripStop be installed? +

    Ideally concrete likes to be placed and cured in squares, so on a 1 to 1 aspect ratio is best. Some engineers use a 1 to 1.5 aspect ratio. Best practices suggest a 1 to 1 aspect ratio. If your forms are 1.5 meters wide, put a joint at every 1.5 meters, and AVOID expansion joints. The TripStop Concrete path System frowns on expansion joints for 2 reasons. Expansion joints are a guaranteed failure if there is any movement of the slabs, and it also reduces the efficiency of the system as it allows the slabs to move away from the hinging properties of the joint, thereby increasing displacement. Slabs with an aspect ratio in excess of 1 to 1.5 are more than likely to experience mid-panel failure due to differential curing. The old story that there are only 2 types of concrete, that is one that has cracked and the other that will crack still hold true. Better it crack where you want it to.
  • Can I pour concrete to both sides of the TripStop joint at the same time? +

    Yes, it is recommended that you do this. During pouring operations, concrete should be poured uniformly on each side of the TripStop joint to ensure the TripStop does not move from its pegged and wedged position. This will prevent possibilities of the joint bowing in the centre. Pouring on both sides of the joint also stop the joint being tilted on its side due to too much concrete on one side of the joint. Make sure that the joint is properly pegged and wedged to reduce the chance of it sliding down the pegs. The net result is the slab is poured into [ideally square] sections which eliminate shrinkage problems. Each slab is completely segregated at the pour.
  • Will the concrete stick to the TripStop when it dries? +

    No. This makes removing a broken slab so easy. Simply crack the concrete and slide the broken pieces away from the TripStop. The TripStop should stay in place against the other unbroken slab ready to pour new concrete connecting the path again. No need to diamond cut a slab again.
  • Should I run an edger along the TripStop joint? +

    You can, but we suggest it looks better if you don't. There are no real benefits in edging the TripStop joints apart from keeping that picture frame look. Downsides of double edging the TripStop joint are edging will cause the TripStop to be a fraction higher than the adjacent concrete, although at the same height as the general height of the slab.Edging also causes a trap for small debris to accumulate. Benefits of NOT double edging the TripStop joint include ending up with more anti slip surface on the slabs e.g. 20% more on a 1.2 x 1.2 panel, a significant time gain for concreters during installation and the finished surface looks better overall giving a dead flat surface. No bump as with traditional picture frame joints. NOTE. Comment has been made that the sharper edge created by NOT edging might mean the sharp edge will chip off. Our experience is this is not the case. One NSW council that has installed approximately 8,000 pieces have noticed NO chipping of the corners adjacent to the TripStop joint. Most Victorian, NSW and Qld councils have tried both and nearly all don’t edge the joint.
  • Why has the TripStop joint produced a wriggly crack along the surface? +

    The concrete has not been finished flush with the top of the TripStop joint. The concrete should be finished flush with the top of the TripStop, not over it. Any concrete over the top level of the TripStop joint will inevitably crack unevenly along the general direction of the joint. It doesn’t seem to affect performance, but is unsightly.

  • Doesn't the TripStop joint crack/break when upward pressure in the concrete on either side of TripStop, particularly if the pressure is “one sided or twisted? +

    No, extensive testing both in house and at RMIT University has shown no sign of cracking in that or any scenario. We put extreme weights on the articulated slabs and could not damage the TripStop itself. This is due the joint itself being under compression which makes concrete stronger. The joint itself has never failed in any test even when raised up under load one sided or twisted.

  • Can you join TripStop if the supplied piece is not long enough for the job? +

    Yes. Use a clamp [steel Vice Grips work best] to clamp the 2 pieces together during the pour. Lay and peg the first piece of TripStop in position. Then line up, lay and peg the 2nd piece then finish off clamping the tops of the 2 pieces together making sure the 2 pieces are level and pour away. Remove the clamp after the pour and screed as usual. The TripStop doesn't have to be in one continuous piece to work but it looks better. You cannot glue 2 pieces of TripStop together.
  • Is there a way of installing TripStop (or a version of it) into existing pavements, such that the new piece of slab doesn't drop below the existing one? +

    No, you can’t retrofit TripStop. When you lay fresh concrete, TripStop imprints the unique double Hinge shape into the two slabs thus connecting them. The go is to always make sure both ends of every slab are imprinted with TripStop. See our installation guides on our downloads page.
  • Are there any safety issues with the use of the TripStop? +

    The cut ends of the TripStop can be sharp. The ends of the steel pegs can also be sharp. It is recommended that gloves be worn when handling the sections to prevent cuts.
  • Is the circular opening in the TripStop available for use as a services conduit (albeit shallow laid) once installed in a pavement? Or will this interfere with its movement? +

    Yes the hole can be used as a services conduit. No the service will not interfere with movement but as the slab is lifted it will lift the service with it. The hole in TripStop is there to enable cooling during manufacture and to save on material and weight. The hole can be round or slightly oval.

  • How can we have trees and safe footpaths? +

    History tells us that you couldn't have both, but you can have both if you use TripStop. It is recommended that TripStop is installed in front of every tree starting at the trunk line and extending out from there to the drip line where the most active roots are at work. However tree roots go much further than this in their quest for moisture and nutrients. Up to double and even triple the width of the canopy in some cases. These roots are finer than the ones on the drip line and probably won’t affect the path that much but as the tree grows they will get thicker and cause displacement.

  • Is the Concrete guaranteed? +

    No. We do not guarantee your supply or quality of concrete.Your concrete strength is affected by many factors such as heat on placement day, water content, types of aggregate etc. We suggest 90 slump and 25 MPA as a minimum.
  • Is TripStop an expansion joint? +

    No, alone TripStop is not an expansion joint. TripStop is a new type of Construction joint called an articulation or double hinge Joint. Now where TripStop is used exclusively in a concrete path, it becomes a universal joint. Then it addresses expansion, contraction and differential movement. All expansion joints will cause trip hazards and maintenance nightmares unless they are doweled. However a Dowel will not articulate like TripStop. The steel Dowel must bend and will only transfer load equivalent to the strength of the slab resulting in slab failure and Displacement.
  • Do we need expansion joints when we use TripStop in all other joints? +

    The City of Monash in Victoria has specified the use of TripStop with no expansion joints at all for many years. We were asked this by Sutherland Council in NSW who use TripStop on a regular basis. They found that Expansion joints were the weak link in their paths. Expansion Joints are all displacements waiting to happen as they easily slide on the smooth expansion material. Sutherland agreed to do a small 'expansion joint free' trial early in 2007. They now don't ever use Expansion joints in any TripStop treated paths. Over 5000 metres of concrete paths were installed in Greenhills Beach Estate in Sutherland in 2012 with TripStop at every joint and with not one single Expansion joint.

  • Is TripStop a Contraction/Control joint? +

    Yes and more. Not only does TripStop give a complete break between one slab and another, TripStop also controls displacement. Where a well made Contraction/Control joint gives a break there is no connection between the slabs apart from aggregate interlock and all these normal joints [Troweled/Saw cut] will displace if tree root invasion or soil movement occurs.
  • What is the difference between TripStop Joints and Key Joints? +

    A key Joint is like a tongue and groove joint made to join 2 slabs of concrete. The key is shaped into the concrete by the bent metal shape. By the form of the joint, 4 angles are introduced into the concrete slabs. There are 2 on the male side and 2 on the female side. The key joint itself does not transfer load. The key was an attempt to improve on the old type expansion joint. The key can snap, but most likely it will be the female side that will crack off can snap or break off when faced with the stresses of rotation. A TripStop joint itself is the means to transfer the load unlike Key Joints and uses the strength of the radius to transfer the load from the lifting slab to the lifted slab through the TripStop. There has never been an overload failure with TripStop, even under exaggerated loads.
  • What is the difference between a TripStop Joint and a steel Doweled joint often called a Slip Joint? +

    A TripStop joint is designed to rotate and transfer load in compression, whereas a slip joint is designed to do just that…slip sideways to accommodate expansion and contraction, assuming the steel Dowels have been installed correctly ie level. If the Dowels have not been set level they will lock up. If sufficient load is applied the Dowels will bend and be rendered useless, or the concrete will break at the end of the dowels and pop through the surface of the concrete. We have all seen this.
  • Does the concrete need to be vibrated to make TripStop work? +

    Properly consolidated concrete is always important. Massive air pockets around any joint are not the best of practices. Over vibrating causes segregation, and excessive surface bleed. A good mix that it properly worked in and around the joint is important. A good mix coupled with good workmanship and a rake or some other tool to insure that there is concrete around the whole surface of the joint is fine. A vibrator in the wrong hands on a 75mm and a 100mm slab is a scary thing.
  • Can you use Steel mesh with TripStop? +

    Yes. So long as the Mesh is covered and finished with 50mm of concrete and this includes 50mm from the edge of the TripStop joint. According to good engineering practice and AS3727 8(e) steel mesh must not be run through joints and must be covered with at least 50mm from all edges of the concrete at all times to protect the steel from the elements. The end result of not protecting the steel mesh is concrete cancer.
  • How does using TripStop to transfer load compare with using Mesh through the joints to transfer load? +

    TripStop transfers load very well as we have tested it under the most extreme situations and it passed all the tests with flying colours. All our reports and videos are published in our website. TripStop allows rotation under compression. This compression is caused by the slab getting longer as it articulates keeping the joint tight. Australian Standards AS37278(e) clearly state not to run wire mesh through control joints. The mesh would have no cover at the joints once it is subject to movement and must corrode. More so we now have proven that when there is uplift the Mesh stretches and snaps.
  • How does Structural Fiber compare with Mesh in a footpath situation? +

    There will be more on this soon as we can gather the information.
  • What degree of ramp is allowable between slabs? +

    Searching various Council websites the degree of lift or ramp angle allowed is ar 1 in 14. Over that and the ramp is too steep and an adjustment is in order. One can easily adjust and lessen this rise if the adjacent slabs have TripStop installed. The term commonly used is 'MUD or SAND JACKING'. We call is Slab Jigging. Usually this is a difficult and expensive practice as its hard to control and keep the slabs aligned. Not so with TripStop. Simply jack up the slab next to the slab with the excessive ramp angle and place some aggregate,soil or sand under the jacked slab, let it down and remove the jack. This will lessen the ramp angle. You can easily do this if you have all your slabs protected with TripStop. Without TripStop and its a certain replacement.
  • What's the maximum panel lift before the crack gets more than 12.5mm or 1/2 inch wide? +

    The table below is displayed in mm. PROFILE Spacing’s Lift Gap 75 1200 25 1.95 75 1200 50 3.64 75 1200 75 6.45 100 1200 25 1.79 100 1200 50 4.65 100 1200 75 8.23 125 1200 25 3.24 125 1200 50 7.47 125 1200 75 12.90
  • What else does TripStop sell? +

    Nothing yet, but we are considering other 'green' lines to compliment our main line. We sell in the main to Cities, Councils and Government bodies. If you have a product that you think we may like please contact us.
  • Does TripStop export to other countries? +

    Yes. We have exported to USA, Canada and New Zealand. We are looking for Distributors for all countries except AU and NZ.

  • Has TripStop been independently tested? +

    Yes. 

    RMIT tested TripStop TS75X, TS100X AND TS125X in our full scale test bed with an incremental lifts to 50mm and published deflection/displacement results.

    MTS tested the TS75S and TS100S in our full scale test bed with an incremental lifts to 108mm and published deflection/displacement results for both. 

    All the tests are available as downloads on our website.

  • What about real life tests? +

    Over 13 years and thousands of meters of TripStop has been installed in the harshest Australian locations. TripStop has also been installed throughout New Zealand, Canada and the USA. TripStop has never failed. While installing TripStop is not rocket science, to install one still has to follow good engineering practices. Simply, install the TripStop upright with no concrete over or under the TripStop and ensure the concrete has been suitably worked or compacted around the joint. Don’t tread on the joint while its wet and so on. We have seen a number of badly installed TripStop where the TripStop was not installed in the correct upright position. If you cant see the top surface of the TripStop it also indicates poor installation.
  • Can TripStop handle very hot conditions? +

    Yes. TripStop being made from PVC is used in all extremes of climate. After more than 13 years in situ we haven't heard of any problems. The sun gets very intense in Australia.

  • Can TripStop handle Freeze and Thaw conditions? +

    Yes. TripStop passed the Freeze and Thaw test with flying colours. See the download. RMIT report on FREEZE / THAW tests on TripStop PVC Joiners for residential concrete pavement (footpath / sidewalk) of 125 mm thickness.TripStop has also gone through 4 freeze thaw cycles in one Canadian City/Council with no problems.

  • Have your competitors independently tested their products? +

    The short answer is no. There are various types of manufactured joints market and none, apart from TripStop, have published measured displacement and Creep results from independent legitimate authorities. Some companies have made feeble attempts to write up in house papers, but are not really worth the paper written on. Additionally, no other jointing system carries a guarantee.
  • I have a question not asked here. How do I find the answer? +

    Fill in the form on the contact page and we will find the answer and post it here.
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