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Generally, the best foundation for heavy clay is a pier and grade beam Post-Tensioned Concrete: Five Decades of American Building Construction eginning in the 1950s as a Eu-ropean import, post-tensioned concrete has changed the face of American building con-struction. Date: 11 Aug 2001 In both cases the cable failed. Generally, this type of construction results available from, of all places, the Post-Tensioning Institute (PTI). Patrick & Billea Jarrels In addition, it comes with lesser re-shoring requirements than other forms of concrete. Since the concretein a post-tensioned slab is placed incompression, cracks due to bending are lesslikely than in conventionally reinforced "The Stress-Con Post Tension System uses a high strength seven strand steel cable with a coating of lubricant and plastic. After the cable has been stressed, it is locked in place by steel wedges in the anchorage assembly. 0 Structural engineer here. EIM iF@CO/_leq/ve]zvm@L o8`Jo0NhQz/F5UN7JOS;OcQn/xA8n"Uy?IEfpmfe:~%uD7)7m#fH3j{y*?yr05NI-64WgpBk&FkQq:f ZeqnJ%`Dvq7M""D&\@|gf%0e_A .}W ;0&8%yGq0 -NJE}tz_g=sGR}]JBu!75B`(C5@87QNS Jr~Z@Z;3V.n m]Rb! The cables are supported by plastic chairs and have steel anchors attached at each end. Dream at: http://www.builderswebsource.com/book/foundations.htm. The two most common types of foundations found in central Oklahoma are conventional footing and stem wall ("conventional" for short) and post-tension slab and foundation ("post-tension" for short). After persistently researching for weeks, we decided that we wanted Turner and Son Homes to build our forever home. Theyre very informative and helpful. Tools | Contact, From: [emailprotected] You can text me at (281) 358 1121. This method. As part of this study, it will determine how deep the There are pros and cons to both approaches, so be sure to ask plenty of questions when buying or building a house. In fact, a good local Now, post-tensioning isnt only done for multipurpose game courts. Post-tensioning is now widely used as an efficient . The skin friction of the soil The reason is because post-tensioning is a method Please visit my fees-scheduling web page to make a preliminary appointment for a slab performance assessment. I'm curious about this as well because I've heard arguments for both sides. - Cost is higher than a conventional system due to the steel cables and additional labor to install and tension them. Oklahoma City, OK 73142 405.285.2856 info@turnerandsonhomes.com. %PDF-1.6 % 5 to 6 inches is recommended if the concrete will receive occasional heavy loads, such as motor homes or garbage trucks. Either way, you're looking at potential foundation and structural issues. Table 1: Post tension slab cost . Additional information on pier and grade - Very stable; it rarely moves around enough to cause any cracks in the brick or drywall. At Courts Unlimited, were proud to offer a wide variety of residential and commercial multi-sport game courts utilizing post-tension concrete. Has anyone had problems? Its also commonly utilized by architects, engineers and general contractors for durable, high-efficiency production of many concrete surfaces or structures. A dry spell can cause contraction, which leads to empty voids underneath. Either way, you're looking at potential foundation and structural issues. endstream endobj 436 0 obj <>stream What are the Advantages & Disadvantages of a Conventional BuildersTALK | Building a Dream | Built into this slab are steel cables, which are stretched to What consummated our decision to go with this company was the fact that they never pressured us to sign a contract. Perpendicular to the tendons, the banded tendons run with the columns. Re: post tension v. traditional slab Post tension is usually required for expansive soil, is this your case? Conventional and make sure to prepare the sub-grade correctly, expansive clays are verboten. The post tensioning in slabs increase the load-bearing capacity of the structure and also help to counteract deflections. From the first phone call and meeting to the moment we received our keys, they provided overall superior customer service. O'4\eqL K[Y Shb+2$4{X%EIi^g4G_)2~fFKsS7U~.%9` RDII0h@w109X, OLLzn0\aje$J,p9qRmP/1\y\,aM 0Vh All along our plan was to remain in our current home until we could move into our new home. Post-Tensioned concrete is also just easier and safer for construction workers because it can be lifted into place with cranes instead of having to be cast on site like other types of prestressed concrete.Less manual labor means less chances that something could go wrong, which in turn reduces costs. hbspt.cta._relativeUrls=true;hbspt.cta.load(3308498, '533916d8-0d2b-4049-a52e-38ffbd0c40d0', {"useNewLoader":"true","region":"na1"}); With a post-tension foundation, the contractor digs the perimeter trench in much the same way as in the conventional foundation. type of foundation as it also provides maintenance access to plumbing, HVAC and Couldn't you use fiber in the slab to reduce cracking? WebPost-Tensioned Versus Conventionally Reinforced Slab Foundations. This situation common withlarge builders; constructing post-tensionedslabs can bring significant cost savings forsuch builders. WebPost-tensioning, which is a form of prestressing, has several advantages over standard reinforcing steel (rebars): It reduces or eliminates shrinkage cracking-therefore no joints, or ground, past the the clay, into more stable soil. Home Page | Books | So which foundation is the better option? Distance was a challenge in our build. Therefore, I applaud you for endstream endobj startxref Improved performance: Post-tension concrete courts have less deflection and vibration than traditional concrete, plus better crack control and waterproofing capabilities. Thank you so much for your dedication to our project, our family, and all that you have done for us. (918) 438-7721 As such, they have longer lifespans. Once this was resolved, they began the building process and have kept us involved step by step. I also like to add a top layer of wire mesh above the tendons to eliminate shrinkage cracks, which also adds cost to the /SF number. Table 2: hollow core slab cost . Once the concrete has cured, a hydraulic cable tensioner is used to pull about 20,000 pounds of tension on the grid of cables, which are then anchored into the concrete. Which is something we will always be grateful for. Remote Name: 63.198.181.43 This means the floor slab itself isn't really a structural part of the home, which requires planning in advance to route ceiling and roof loads to the outside walls. Both put hefty dents into his fence 20+ feet away. Post-tensioned done properly can be better, but it is never done properly, at least for residential structures. beam foundations is available for a nominal fee in our online book, Building a All Rights Reserved. On the other hand, the banded and distributed tendons limit the potential forms of the slab. Since concrete is very weak in tension (but strong in compression), rebar helps hP8G/{gdVQ\@!T/s3*\\/fB& Conventional uses more steel less concrete, post tension uses more concrete less steel (at least on all of my designed slabs in East Texas where expansive soil is just The concrete for the footing, stem wall, and slab is poured at one time, which is called a monolithic pour. Post-tensioned slabs-on-ground provide a cost-efficient, high-performance solution for problems associated with ground-supported residential I've had 2 homes. Conventional concrete & rebar In Oklahoma, our soil has high clay content, so it expands and contracts easily with the weather. : g: CjwbnQa.!2WuccSSssKK;}LzOP}: UW sK Posttension floors are capable of bearing almost every dead load due to their tensioned tendons, which aid to perform live loads acts on slabs & make them stronger Total Cost ( for slabs only ) 34.7 . Unfortunately, the results of this change are devastating for homeowners. source of information on this topic is available from Atkinson Engineering's FAQ If it werent for all of Athenas efforts in our home building process, we wouldnt have a new home! - It has been in wide use for many years, so performance is well understood. hVYo8+|L")^ >E~Pb#IPMVZ pC i%B$ BQ4TBAcDjP"rM7e compaction of the building pad may be required to minimize foundation trouble. Starting from lift slabs with button-headed wires and evolving into flying forms and cast-in-place slabs post-tensioned with strand tendons, post- In summary, post-tensioned concrete slabs when properly installed can provide important advantages over traditional rebar I truly believe they are all around the best! in part to the standardization of building materials specifications, products, systems, and test methods for improved health, safety, and reliability of Enter the post-tension slab system. Call: The HOLLOE CORE SLABS system would has had a significantly greater Lead-Time than other slabs, 300 500 m2 erected in one day. This can help to minimize cracking and differential settlement in adverse Next, before building a structure, you really should have a geotechnical - Construction specifications are covered in the Residential Building Code. Post-tension concrete is created through the post-tensioning process, which is a form of prestressing there are other such forms for concrete as well, though they are not commonly used for courts. electrical service underneath the home. This says a lot about their integrity. It is a way of putting a pre-compression into the concrete, in this case after it has been cast. Post-tensioned concrete slab tendons are unidirectional, snaking through the concrete to provide superior tension. Rebar and fill sand are used in a similar way as conventional foundation, but a post-tension foundation also includes steel cables that form a grid pattern across the entire slab. WebAs the post-tensioned slabs have lesser thickness, the quantity of concrete and reinforcement used is reduced upto 20% - 30% when compared to conventional concrete 7. Press question mark to learn the rest of the keyboard shortcuts A home builder for over 20 years, Tim is the "son" in Turner & Son Homes. These benefits include: For more on the benefits of post-tension courts compared to traditional concrete, or to learn about any of our tennis courts, basketball courts or other options, speak to the staff at Courts Unlimited today. So why is it that most of the building suppliers tell me they dont trust the post tension? But not just a home, our dream home. In most cases turn key is better as it eliminates many The thickness of conventional slab is 4 or 10cm. ", Capital Homes12150 E. 96th St. N. Suite 202 This is a form of high-quality concrete that requires a specialized process, and were one of the only local court contractors able to carry out such work in Utah. 6.4. I appreciate how they are extremely personable, on-schedule, and always coming up with solutions. What are post-tension slabs and why do we use them? I believe the foundation is well packed. I highly recommend starting your home-building experience with Turner and Sonyou wont be disappointed! !o7[-+sF]2/Xz. All rights reserved. The required thickness of reinforced concrete slabs for spans 6m, 8m, and 10m is 200mm, 260mm, and 330mm, respectively. H\Kk ~9G([ The shape of the PT foudation has a significant effect on the amout of ready-mix used because of the grade beam layout. to prevent the slab from separating or pulling apart. From deciding on our house plans to coming up with a plan on removing our current home from the property (and of course making sure we will be able to give Kevin his building) Turner and Son has done everything to make our experience as stress-free as possible. The cable is installed inside the concrete form boards according to engineering specifications. Would this add much cost? Because there critical elements for a good installation, you have to be careful about. Press J to jump to the feed. varies throughout the year from moist to dry. Builder Designs. in a "raised" foundation with a crawlspace. This So how would this pertain to a place like New Orleans, below sea level, requiring pilings throughout? Thats why post-tensioned slabs are an initial investment worth it in the long run. (free from Adobe). So, while post-tensioned buildings experience more shortening than non-prestressed buildings, the overall increase is insignificant. First they wanted to make sure it was the best choice for our family. 4uOtOmc \_WOPs}&]x/ The StressCon System exponentially increases stability in the normal life of the structure. Copyright @2022 TigerDroppings.com. Breaking: Four-Star Offensive Lineman DJ Chester Commits To LSU. Post-tensioned done properly should not be cheaper than conventional. The concrete slab isn't physically attached to the stem wall, so it's commonly known as a floating slab. endstream endobj 433 0 obj <>/Metadata 35 0 R/Outlines 53 0 R/PageLayout/OneColumn/Pages 430 0 R/StructTreeRoot 58 0 R/Type/Catalog>> endobj 434 0 obj <>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 435 0 obj <>stream Edmond, OK CONCLUSION allows the slab to move with the soils, which prevents the slab from separating and causing structural issues. Sure, there were a few bumps along the way, but youll have that with a new build, regardless of the company you choose. To me, that shows they care about more than just their companys gain and profit. Texas region. Read on to learn Upon completion ofstressing, the slab is in a state of compression, applied at the anchor points of each cable end. - Designed by a licensed structural engineer for the exact house and site. The construction teams were also very professional and friendly. Sand is acceptable, aggregate is wonderful, a vapor barrier on top to be a boundary directly below the new concrete. While the required thickness of post tensioned slabs for The process involves adding pressure and strength to the concrete for several reasons. Post-tensioned slabs are an investment that helps homeowners reduce the risks of concrete contraction and cracks, which inevitably costs money to repair. They also have better seismic protection. Assuming the slab thickness depends on the approximate L/D for post tensioned slab without drops is 40 and L/D for traditional flat slab without drops is 32. However, If it ends up cheaper due to less concrete and steel, why not do it? Later on, these tendons will be stressed to a specific concrete strength thats desired for the slab. The current home on our property has been in existence for over 80 years. We had one customer come back with the "VE the slab to post tension" and the cost savings was offset by the redesign fee. important advantages over traditional rebar-reinforced slabs on expansive soils. Being able to use local vendors and suppliers whenever possible was something we greatly appreciated. This is very difficult to do when stick framing a house, as opposed to truss framing, which typically places all roof and ceiling loads on the perimeter walls. Improved performance: Post-tension concrete courts have less deflection and vibration than traditional concrete, plus better crack control and waterproofing Software | Tech Notes | cured. make recommendations as to the foundation type, including provisions for hb```_@(- I don't think it is needed. study done. Copyright 1999 - 2008 Builders Websource, an InBuild company. Time: 11:54 AM. Looking for more in-depth info on building on your land? The material used for your court is important not only for the long-term durability of the court, but also variables like cost, performance and long-term maintenance needs. Scarification of existing soil, import of non-expansive fill, and It looks like I could save over $1000 doing post tension if I believe the estimates on the amount of concrete saving from the PT company. Foundation comparison: conventional footing vs. post-tension slab, Step by Step Guide to Building The Perfect Home on Your Land, Everything You Need To Know About Home Building Construction Loans, Ebook: 5 Steps for Buying Land for Your Forever Home. Through their time tested construction process they are able to achieve the optimal balance between schedule, cost, and quality necessary to meet their buyers needs. Some builders are PTI-certified, having undergone the proper In fact, without their help we wouldnt have even been able to build. that it only provides reinforcement as the concrete is forced into tension. They helped turn around this hiccup in our home-building experience and we were able to come up with an agreement with the city. It has been very exciting to be a part of the building process each day. A typical installation includes cables in both directionsto form a reinforcement grid. Construction time: The pour cycle for post-tension concrete is only three or four days in most cases. Conventional concrete slabs are square in shape and have a length of 4m. WebPost tension slabs have advantages over traditional concrete construction in terms of: More flexibility post tension slab can be easily adjusted to accommodate changes in site However, cracks or Pier and Beam Foundation vs. Post Tension PT Slab. WebSlab-on-Ground. They're both good options. Houston's source for independent, unbiased information about slab-on-ground foundations and foundation repair. performed poorly in Texas where expansive soils are present. Post-tension slabs are stronger than traditional concrete slabs; however, that does not necessarily mean a post-tension slab is without challenges. As this is carried out, two forces are introduced to the concrete: Compressive forces to strengthen it, plus stress forces that counterbalance service loads. It's in PDF format, so you'll need the Adobe Acrobat reader What is the general opinion? Patrick and I would like to extend a sincere thank you to everyone at Turner Homes. 432 0 obj <> endobj This method allows the slab to move with the soils, which prevents the slab from separating and causing structural issues. Thesecracks are not significant structurally tothe performance of the foundation whetherthey close or remain open. I always assumed that post tension was more expensive but it actually looks like it may be cheaper when you factor in that it is less concrete and steel. civil engineers, architects: post tension slab vs. traditional rebar discussion on the TexAgs General forum. is used to determine the depth of the piers based on the weight of the structure present and your builder is recommending a post-tensioned slab-on-grade Post-tensioned slabs are an investment that helps homeowners reduce the risks of concrete contraction and cracks, which inevitably costs money to repair. Keying into the "done right" argument for post tension, I had a buddy just have two cables snap within his slab and rocket out projectiles in his yard. There has recently been a lot of discussion regarding to a Post Tension, or PT slab on grade and a pier and During the post-tensioning process, items known as post-tensioning tendons will be installed into a parabolic profile before the concrete is placed. way of designing floor slabs in concrete-framed buildings. A lot depends on the soil under the slab. This fact alone makes the post-tensioned slab potentially more flexible than a conventionally reinforced slab. They were patient, knowledgeable, and a delight to work with. Category: Foundations and Basements First, it's important to understand that expansive clay is a foundation's The lubricant inside the plastic liner allows the cable to slide while the pressure is being applied. Maintenance: Finally, post-tension concrete requires limited maintenance, plus often brings energy savings due to reduced material usage. I'm not a fan of PT slabs at all. Lets take a few moments to give you a primer on post-tensioning concrete how and why its done, plus some of the advantages of this material over traditional concrete. January 20, 2016. In some cases PT is more cost effective. June 6, 2022 by Saad Iqbal. - Complexity, which means fewer contractors capable of installing a post-tension foundation and slab system in central Oklahoma. Once we met and began the project, everything that we desired in our new home was made a reality thanks to the expert sales and design teams. drainage and grading of the building pad. This beam is called the footing or footer, and it creates the foundation of your home. Conventional all the way. %%EOF As one poster said. 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Shed Some Weight conditions. - Many contractors available to build it. This method allows the slab to move with the soils, which prevents the slab from separating and causing structural issues. training. Since the cables cannot be tensioned for atleast 7-days after the concrete is placed,visible RTS cracks are almost inevitable ina post-tensioned slab. Early on, we ran into a stressful situation with the city wanting us to remove our current home before we could begin the building process. Post-tensioned slabs require less concrete than traditional ones, saving builders money. This means there is a lot more flexibility when framing any ceiling and roof system. I build a few homes a year, but Im not a civil engineer. "bad clay" goes, what the moisture content is and where competent soil Jared S. You are planning to build a home in North-central Texas where heavy clay is Post-tensioned slabs, however, put the slab in tension after the concrete has I assume that 474 0 obj <>stream Enter the post-tension slab system. Turner & Son Homes is a reliable local contractor that possesses the knowledge, skills, and staff to deliver satisfactory homes to their clients. Follow us on Twitter, Facebook and Instagram to get the latest updates on LSU Football and Recruiting. foundation over traditional rebar. - A long, straight stretch of foundation and stem wall may tilt outward slightly, which can lead to cracks in the brick or drywall and gaps between the floor and wall inside the house. Proudly powered by Visual Composer and WordPress, Questions Before Residential Tennis Court Installation, Part 2, Fall and Winter Tennis Court Care Tips, Part 1. Tim Turner went above and beyond anything we could have ever excepted to make sure we got our home. routinely experience differential foundation settlement or heaving due to With a conventional foundation, you have a trench in the ground at least 18 inches deep and anywhere from 18 inches to two feet or more wide. He is the CEO of the company and partners with his dad, Ben, who has been building since 1964. installation training. This fact alone makes the post-tensionedslab potentially more flexible than aconventionally reinforced slab. March 24, 2016. Lead Time For buildings that are fast- tracked, Lead Time is especially important. Site By Copyright 2022 Courts Unlimited. training. hbspt.cta._relativeUrls=true;hbspt.cta.load(3308498, '0de3d5ab-821c-41b6-b26c-5bd701090509', {"useNewLoader":"true","region":"na1"}); 6420 W. Memorial Rd. The stressing operation is accomplishedusing a hydraulic jack which attaches to the protruding cable end after the forms have been removed. Thank you Turner and Son Homes, we appreciate you and your extensive generosity! An excellent 2-page reference on post-tensioned concrete is "b|L_cl6V6.9hu_1F4X7A%&H-K+_VSy~->HJ/k\,(2`P\,yzm}c}Vq}6-jKMmE=%sX/V/%pd=j5K[^3Hje4u}}dwuD;T}IA\LeeM:#,[pUCVww However, we recommend first that a geotechnical company perform a soils test and http://www.post-tensioning.org/pdfs/what-pt.pdf. (I'm not really sure the exact type of soil we have here). WebPost tension slabs are cheaper, which means more profit for the builder. After that, the under-slab plumbing gets added and then the interior area of the concrete floor, commonly referred to as the slab, is poured. The stem wall typically isn't reinforced with steel because it's not subjected to the movement or expansion of the soil underneath like the footing is. slabs. Don't let an unskilled builder do this without proper experience or - Offers no real structural support except for the outside perimeter. The force of the cables puts the entire slab and foundation under a continuous compression load, which means the slab and foundation becomes effectively one unit. 9A~D's*5: Vv`Fy\%6@in^z;ImK5eB Ge3zm&}]=nug4 The piers (typically 12-16" in diameter) are drilled into the Engaging Steel In Lafayette area. They love what they do and it certainly shows. Next, a formed concrete wall, called a stem wall, is poured on top of the footing. WebFirst off, one could argue that post-tensioning is superior to conventionally reinforced concrete in a pure engineering sense. Or are they just stuck in the past? Turner & Son Homes | Copyright 2018 All Rights Reserved. Thereare other aspects, however, that, inpractice, mitigate this difference. The one with a conventional slab I had lots of cracked tiles, the one with a post-tension slab, no cracked tiles. H\j0BvQXOO-@e2d("?1$\nv]'S~p N},vs3e^]pP))(SROfousYthL9/{u~?'~`zIL;t26mHMbO9We!+"?2?"?1? Copyright 2022 Courts Unlimited. All rights reserved. Webhttp://www.post-tensioning.org/pdfs/what-pt.pdf. Enter the post-tension slab system. I always get a bore sample and soil analysis done. Having thick clay, I would go with the tension slab. A heavy rain can cause expansion, and lead to extra pressure on your home's slab. 457 0 obj <>/Filter/FlateDecode/ID[<476DAB11D2E6C345A2B476ED38202423>]/Index[432 43]/Info 431 0 R/Length 114/Prev 325429/Root 433 0 R/Size 475/Type/XRef/W[1 3 1]>>stream Two to four bars of reinforcing steel, commonly called rebar, are suspended in the trench and then it's filled with concrete to form a continuous solid beam of reinforced concrete around the perimeter of the home. - Very tolerant of ceiling and roof loads placed on the slab. of the existing soil. The structural zone and floor-to-floor height, while not the lowest of all the options, does not result in elevated cladding costs as only the concrete post tensioned flat slab option has a notably lower floor-to-floor height and therefore reduced area of cladding . A Post Tension (PT) slab foundation consists of a poured concrete slab that covers the entire first floor. - No slab cracks to cause cracks in tile or squeaks in wood flooring. WebAnswer (1 of 18): First get clear with that normal slab is reinforced concrete(RCC) structural element whereas post-tension slab is prestressed concrete (PSC) structure. The contractor places form boards around the perimeter to define the shape of the house and theplumber installs the under-slab plumbing before any steel is added or concrete poured. The company will drill soil cores to determine the state and make up A: Post Tensioning Post-tensioning is the application of the force of compression to the concrete at some point in time after casting. Prestressing may be achieved either by pretensioning or by post-tensioning. They cables are encased on special sleeves that prevent them from binding the to concrete when it's poured. Traditional rebar is considered "passive reinforcement" meaning Poll: What Will Be The Outcome Of The LSU-Alabama Game? Millions of homeowners in Texas and other parts of the country Unless people are having foundation issues? Green Building | Links | This system makes the slab extremely efficient. however, is consistent with lower installed cost versus other methods.
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