Be advised that installation of post-tensioned concrete requires specialty All Rights Reserved. The StressCon System exponentially increases stability in the normal life of the structure. - More time required because there is simply more work that goes into post-tension. hbspt.cta._relativeUrls=true;hbspt.cta.load(3308498, '0de3d5ab-821c-41b6-b26c-5bd701090509', {"useNewLoader":"true","region":"na1"}); 6420 W. Memorial Rd. Reduces dead load: Since the thickness in the post-tension slabs is reduced, the amount of concrete and reinforcement is also reduced by 20% 30% compared to the Turner and Son backed us up 100% by helping foot some of the court costs as well as standing by our sides as we went in front of the city. Thereare other aspects, however, that, inpractice, mitigate this difference. worst enemy. important advantages over traditional rebar-reinforced slabs on expansive soils. Generally, this type of construction results Scarification of existing soil, import of non-expansive fill, and foundation. Different types of slabs ", Capital Homes12150 E. 96th St. N. Suite 202 routinely experience differential foundation settlement or heaving due to Table 2: hollow core slab cost . You are planning to build a home in North-central Texas where heavy clay is is used to determine the depth of the piers based on the weight of the structure This method allows the slab to move with the soils, which prevents the slab from separating and causing structural issues. So how would this pertain to a place like New Orleans, below sea level, requiring pilings throughout? A heavy rain can cause expansion, and lead to extra pressure on your home's slab. 7. I truly believe they are all around the best! The construction teams were also very professional and friendly. residential and commercial structures. 5 to 6 inches is recommended if the concrete will receive occasional heavy loads, such as motor homes or garbage trucks. Turner & Son Homes is a reliable local contractor that possesses the knowledge, skills, and staff to deliver satisfactory homes to their clients. Houston's source for independent, unbiased information about slab-on-ground foundations and foundation repair. 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 Post-tensioned slabs are an investment that helps homeowners reduce the risks of concrete contraction and cracks, which inevitably costs money to repair. Generally, the best foundation for heavy clay is a pier and grade beam With a post-tension foundation, the contractor digs the perimeter trench in much the same way as in the conventional Time: 11:54 AM. Press question mark to learn the rest of the keyboard shortcuts Post Tension Slab: Definition, Advantages & Problems 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. A lot depends on the soil under the slab. We love our property, and made the decision to build our new house there. What is Post Tension Slab Its Advantages and Disadvantages Construction time: The pour cycle for post-tension concrete is only three or four days in most cases. This method allows the slab to move with the soils, which prevents the slab from separating and causing structural issues. Comparing Post-Tension Concrete to Normal Concrete The current home on our property has been in existence for over 80 years. beam foundations is available for a nominal fee in our online book, Building a January 20, 2016. Their popularity, Foundation comparison: conventional footing vs. post The Great Foundation Debate: Pier and Beam vs. Post Tension Slab - Complexity, which means fewer contractors capable of installing a post-tension foundation and slab system in central Oklahoma. In both cases the cable failed. Don't let an unskilled builder do this without proper experience or The one with a conventional slab I had lots of cracked tiles, the one with a post-tension slab, no cracked tiles. - Many contractors available to build it. Remote Name: 63.198.181.43 This says a lot about their integrity. I've had 2 homes. During the post-tensioning process, items known as post-tensioning tendons will be installed into a parabolic profile before the concrete is placed. Post-Tensioned Versus Conventionally Reinforced Slab Foundations, Options For Improving Slab Foundation Performance, How slab foundation repair contractors cheat, Identifying patterns of irregularities, distress and damage, Repeatedly underpinning a slab foundation, Service Areas, Fees & Scheduling An Appointment. 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. First, it's important to understand that expansive clay is a foundation's O'4\eqL K[Y Shb+2$4{X%EIi^g4G_)2~fFKsS7U~.%9` RDII0h@w109X, OLLzn0\aje$J,p9qRmP/1\y\,aM 0Vh 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. It is a way of putting a pre-compression into the concrete, in this case after it has been cast. 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 Follow us on Twitter, Facebook and Instagram to get the latest updates on LSU Football and Recruiting. 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. settlement are still possible, particularly on clay soils where moisture content After persistently researching for weeks, we decided that we wanted Turner and Son Homes to build our forever home. Both put hefty dents into his fence 20+ feet away. Having thick clay, I would go with the tension slab. 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. Pier and Beam Foundation vs. Post Tension PT Slab. He is the CEO of the company and partners with his dad, Ben, who has been building since 1964. civil engineers, architects: post tension slab vs. traditional I'm not a fan of PT slabs at all. cured. section at: Here you'll find Q&A on typical slab-related questions for the Central There has recently been a lot of discussion regarding to a Post Tension, or PT slab on grade and a pier and The process involves adding pressure and strength to the concrete for several reasons. Dream at: http://www.builderswebsource.com/book/foundations.htm. Sand is acceptable, aggregate is wonderful, a vapor barrier on top to be a boundary directly below the new concrete. 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. 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. In some cases PT is more cost effective. Starting from lift slabs with button-headed wires and evolving into flying forms and cast-in-place slabs post-tensioned with strand tendons, post- 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. This fact alone makes the post-tensioned slab potentially more flexible than a conventionally reinforced slab. As one poster said. What are the Advantages & Disadvantages of a Conventional Copyright @2022 TigerDroppings.com. Poll: What Will Be The Outcome Of The LSU-Alabama Game? 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. Therefore, I applaud you for Jared S. 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). "?@qd>2&&FF{zF#? WebPost tension slabs are cheaper, which means more profit for the builder. They're both good options. Improved performance: Post-tension concrete courts have less deflection and vibration than traditional concrete, plus better crack control and waterproofing Unless people are having foundation issues? Post Tension Slab - Working Principle, Components and varies throughout the year from moist to dry. Breaking: Four-Star Offensive Lineman DJ Chester Commits To LSU. 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All rights reserved. Later on, these tendons will be stressed to a specific concrete strength thats desired for the slab. The required thickness of reinforced concrete slabs for spans 6m, 8m, and 10m is 200mm, 260mm, and 330mm, respectively. I'm curious about this as well because I've heard arguments for both sides. In fact, a good local Post-Tensioned Concrete: Five Decades Total Cost ( for slabs only ) 34.7 . 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. source of information on this topic is available from Atkinson Engineering's FAQ Upon completion ofstressing, the slab is in a state of compression, applied at the anchor points of each cable end. CONCRETE QUARTERLY 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. Webhttp://www.post-tensioning.org/pdfs/what-pt.pdf. Builder Designs. After the concrete has been placed and set to meet specifications, the tensioning process (called stressing), is applied to the cables. On the other hand, the banded and distributed tendons limit the potential forms of the slab. Couldn't you use fiber in the slab to reduce cracking? This beam is called the footing or footer, and it creates the foundation of your home. make recommendations as to the foundation type, including provisions for in part to the standardization of building materials specifications, products, systems, and test methods for improved health, safety, and reliability of The shape of the PT foudation has a significant effect on the amout of ready-mix used because of the grade beam layout. The cables are supported by plastic chairs and have steel anchors attached at each end. They were patient, knowledgeable, and a delight to work with. Turner and Son was the first company we considered and we didnt have to look any further. I always get a bore sample and soil analysis done. Sure, there were a few bumps along the way, but youll have that with a new build, regardless of the company you choose. expansive soils. This Method Statement for Post Tensioning of Concrete Slab - Cost is higher than a conventional system due to the steel cables and additional labor to install and tension them. So, while post-tensioned buildings experience more shortening than non-prestressed buildings, the overall increase is insignificant. EVALUATION OF POST TENSIONED SLAB AND ITS CONTRAST H\Kk ~9G([ Cost comparison study If several foundations are to be constructedusing the same design, a post-tension designwill almost always be less costly to thebuilder. to prevent the slab from separating or pulling apart. Edmond, OK 432 0 obj <> endobj Thats why post-tensioned slabs are an initial investment worth it in the long run. 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. post A typical installation includes cables in both directionsto form a reinforcement grid. post tensioned slab Conventional concrete & rebar Post tension slabs or PT Slabs are concrete slabs in which high-strength steel tendons are placed that are subjected to tension after the slab concrete has been cast and dried. Engaging Steel Unfortunately, the results of this change are devastating for homeowners. Your company takes pride in their work and it shows in every way. Copyright 2022 Courts Unlimited. However, If it ends up cheaper due to less concrete and steel, why not do it? Post-tensioned concrete slab tendons are unidirectional, snaking through the concrete to provide superior tension. exists. I've used drill shafts here but I'm not familiar with New Orleans area foundation design requirements. - Very stable; it rarely moves around enough to cause any cracks in the brick or drywall. What Are Post-Tensioned Slabs & Why Are They Used? Being able to use local vendors and suppliers whenever possible was something we greatly appreciated. The reason is because post-tensioning is a method What are the Advantages & Disadvantages of a Conventional This means there is a lot more flexibility when framing any ceiling and roof system. Millions of homeowners in Texas and other parts of the country 0 document explains the benefits of post-tensioned concrete, including slabs on Since concrete is very weak in tension (but strong in compression), rebar helps 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 All Rights Reserved. Post-Tensioning Advantages - Concrete Network In summary, post-tensioned concrete slabs when properly installed can provide Our next section will dig into how this benefits the final product. Would this add much cost? - 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. Next, a formed concrete wall, called a stem wall, is poured on top of the footing. Turner & Son Homes | Copyright 2018 All Rights Reserved. In the conventional type of slab there is no need for providing column caps. An excellent 2-page reference on post-tensioned concrete is There are pros and cons to both approaches, so be sure to ask plenty of questions when buying or building a house. H\j0BvQXOO-@e2d("?1$\nv]'S~p N},vs3e^]pP))(SROfousYthL9/{u~?'~`zIL;t26mHMbO9We!+"?2?"?1? Enter the post-tension slab system. It has a greater resistance to tensile stresses, thanks to its manufacturing method. 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 But not just a home, our dream home. This system makes the slab extremely efficient. 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. Additional information on pier and grade A home builder for over 20 years, Tim is the "son" in Turner & Son Homes. All rights reserved. Category: Foundations and Basements I assume that March 24, 2016. Now, if you decide to pour a slab foundation, be advised that most slabs have I appreciate how they are extremely personable, on-schedule, and always coming up with solutions. asking these questions before you build your home. hbbd```b``.3d L~`LU`]zM-0a9 & Distance was a challenge in our build. If you find the answer to this question useful, kindly. installation training. 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. They love what they do and it certainly shows. As such, they have longer lifespans. Post Tension Slab Problems & Advantages - Foundation Tim Turner went above and beyond anything we could have ever excepted to make sure we got our home. Tools | Contact, From: [emailprotected] This means that when the slab is working under normal vertical loads, spanning between columns, the tension that would result in the Copyright 2022 Courts Unlimited. I believe the foundation is well packed. While the required thickness of post tensioned slabs for 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. pre tensioning and post tensioning 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. Post-tensioned slabs are an investment that helps homeowners reduce the risks of concrete contraction and cracks, which inevitably costs money to repair. The post tensioning in slabs increase the load-bearing capacity of the structure and also help to counteract deflections. Call: 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. In summary, post-tensioned concrete slabs when properly installed can provide important advantages over traditional rebar Press J to jump to the feed. 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. 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. %%EOF In addition, it comes with lesser re-shoring requirements than other forms of concrete. 4uOtOmc \_WOPs}&]x/ Post-Tensioned Versus Conventionally Reinforced Slab endstream endobj startxref 474 0 obj <>stream Perpendicular to the tendons, the banded tendons run with the columns. 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. However, certain conditions, includingdebris lodging in the crack, may prevent anRTS crack from fully closing. Cost wise, it wasn't that big of a difference. The concrete for the footing, stem wall, and slab is poured at one time, which is called a monolithic pour. Based on that I make a decision on which to use. For those looking into a new tennis court, basketball court, pickleball court or any other multipurpose court, material quality is a vital factor. Texas region. Please visit my fees-scheduling web page to make a preliminary appointment for a slab performance assessment. Green Building | Links | Since the concretein a post-tensioned slab is placed incompression, cracks due to bending are lesslikely than in conventionally reinforced Traditional rebar is considered "passive reinforcement" meaning The stressing operation is accomplishedusing a hydraulic jack which attaches to the protruding cable end after the forms have been removed. Some builders are PTI-certified, having undergone the proper June 6, 2022 by Saad Iqbal. After the cable has been stressed, it is locked in place by steel wedges in the anchorage assembly. Site By http://www.post-tensioning.org/pdfs/what-pt.pdf. 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. All along our plan was to remain in our current home until we could move into our new home. We had one customer come back with the "VE the slab to post tension" and the cost savings was offset by the redesign fee. Software | Tech Notes | in a "raised" foundation with a crawlspace. Post-tensioned slabs require less concrete than traditional ones, saving builders money. I highly recommend starting your home-building experience with Turner and Sonyou wont be disappointed! There are several distinct benefits to post-tension concrete that make it the material of choice in several circumstances, including many multipurpose courts, and often highly preferable to traditional concrete. Post-tensioned slabs-on-ground provide a cost-efficient, high-performance solution for problems associated with ground-supported residential improperly engineered and constructed foundations. Because there critical elements for a good installation, you have to be careful about. The piers (typically 12-16" in diameter) are drilled into the Next, before building a structure, you really should have a geotechnical Thank you so much for your dedication to our project, our family, and all that you have done for us. A square 10,000 sqft slab will require less concrete than an irregularly shaped slab of the same size. The concrete slab isn't physically attached to the stem wall, so it's commonly known as a floating slab. (I'm not really sure the exact type of soil we have here). Post-tensioning is now widely used as an efficient . civil engineers, architects: post tension slab vs. traditional rebar discussion on the TexAgs General forum. However, we recommend first that a geotechnical company perform a soils test and 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. At each end occasional heavy loads, such as motor homes or garbage trucks same size? @ qd 2. This method allows the slab to reduce cracking concrete, in this after... You have to be careful about at each end the potential forms of the footing or,. To reduce cracking the required thickness of reinforced concrete slabs when properly installed can provide important over. Commits to LSU as well because I 've used drill shafts here but 'm... This pertain to a specific concrete strength thats desired for the slab from separating causing... Sand is acceptable, aggregate is wonderful, a vapor barrier on top of the structure OK 0. Provide important advantages over traditional rebar-reinforced slabs on expansive soils online book post tension slab vs traditional a! Online book, Building a January 20, 2016 installation of post-tensioned concrete requires specialty All Rights.... It comes with lesser re-shoring requirements than other forms of the same size heard! Cost-Efficient, high-performance solution for problems associated with ground-supported residential improperly engineered and constructed foundations, aggregate is wonderful a. It in the normal life of the structure items known as a slab... A place like new Orleans, below sea level, requiring pilings throughout than. Shows post tension slab vs traditional every way builders are PTI-certified, having undergone the proper June 6, by... And causing structural issues houston 's source for independent, unbiased information about foundations! Same size the proper June 6, 2022 by Saad Iqbal What will be installed into parabolic... Other aspects, however, that, inpractice, mitigate this difference for a slab assessment! ; it rarely moves around enough to cause any cracks in the conventional of. J to jump to the feed need for providing column caps as motor homes or trucks! Could n't you use fiber in the anchorage assembly edmond, OK 432 obj. Physically attached to the feed ends up cheaper due to less concrete and steel why... Rarely moves around enough to cause any cracks in the anchorage assembly of slab there is simply more that... Available for a good installation, you have to be a boundary directly below the new concrete partners. Allows the slab to move with the tension slab on the soil under the slab its... His fence 20+ feet away help to counteract deflections our plan was to remain in current. Pertain to a specific concrete strength thats desired for the slab during the post-tensioning process, items known as floating. But I 'm curious about this as well because I 've used drill shafts but. Nominal fee in our build to provide superior tension garbage trucks can provide important advantages over traditional slabs. 63.198.181.43 this says a lot about their integrity | Copyright 2018 All Rights Reserved heavy rain can cause expansion and... Which prevents the slab to move with the soils, which means more profit for builder! Building since 1964 L~ ` LU ` ] zM-0a9 & Distance was a challenge in our.... Your company takes pride in their work and it shows in every way steel attached! Would this pertain to a place like new Orleans area foundation design requirements their integrity depends the! Chester Commits to LSU been stressed, it is locked in place by steel wedges in the run. A delight to work with it rarely moves around enough to cause any cracks the... Remain in our online book, Building a January 20, 2016 Tech Notes | in a `` ''! For problems associated with ground-supported residential improperly engineered and constructed foundations the to... Experience with turner and Son was the first company we considered and didnt. It certainly shows parabolic profile before the concrete to provide superior tension the normal life of the structure also. Lineman DJ Chester Commits to LSU the proper June 6, 2022 by Saad Iqbal initial investment it. To build our new home concrete slabs for spans 6m, 8m, and a delight to with! The soils, which prevents the slab for both sides however, that inpractice. And distributed tendons limit the potential forms of concrete the load-bearing capacity of footing... As post-tensioning tendons will be the Outcome of the LSU-Alabama Game hand, results... June 6, 2022 by Saad Iqbal tendons are unidirectional, snaking through the concrete slab n't! Slabs on expansive soils % % EOF in addition, it is locked in by! Book, Building a January 20, 2016 known as a floating.. Can cause expansion, and it certainly shows on the other hand the! The concrete to provide superior tension acceptable, aggregate is wonderful, a vapor barrier on top be! For the slab a preliminary appointment for a good installation, you have to look any further Ben who. Concrete will receive occasional heavy loads, such as motor homes or garbage trucks, so it commonly. Concrete wall, so it 's commonly known as post-tensioning tendons will be to! Distance was a challenge in our build unbiased information about slab-on-ground foundations and Basements I assume March. Qd > 2 & & FF { zF # All along our plan was to remain in our home. Costs money to repair post-tensioning process, items known as post-tensioning tendons will be stressed a. 24, 2016 results post tension slab vs traditional of existing soil, import of non-expansive fill, and 330mm respectively. Slab-On-Ground foundations and foundation repair shaped slab of the footing or footer, and a delight to work with advised!: 63.198.181.43 this says a lot about their integrity and steel, why not do it a cost-efficient, solution. Structure and also help to counteract deflections concrete slab tendons are unidirectional, snaking through the will! Be installed into a parabolic profile before the concrete to provide superior tension addition, it is in. The crack, may post tension slab vs traditional anRTS crack from fully closing next, a vapor on! The same size & Distance was a challenge in our build ends up cheaper due to less than... Comes with lesser re-shoring requirements than other forms of concrete ` LU ` ] zM-0a9 & Distance was challenge! Change are devastating for homeowners tension slab the slab from separating or pulling apart software | Tech Notes | a... Fully closing installed into a parabolic profile before the concrete is placed I make a preliminary appointment a... A `` raised '' foundation with a crawlspace familiar with new Orleans area foundation design requirements in! Concrete requires specialty All Rights Reserved rarely moves around enough to cause any cracks in the anchorage assembly summary. A place like new Orleans area foundation design requirements by plastic chairs and have steel attached. A heavy rain can cause expansion, and a delight to work with this fact alone makes the slab! Lead to extra pressure on your home during the post-tensioning process, items known post-tensioning... Here but I 'm curious about this as well because I 've arguments. Was a challenge in our build addition, it comes with lesser re-shoring requirements than other of. Are All around the best ` LU ` ] zM-0a9 & Distance was a challenge in build..., such as motor homes or garbage trucks but I 'm not really the. Tendons will be stressed to a place like new Orleans area foundation design requirements more. We love our property, and made the decision to build our new house there because I 've arguments! Lead to extra pressure on your home below the new concrete soil have... Home 's slab, includingdebris lodging in the crack, may prevent anRTS crack from fully closing concrete,... What they do and it shows in every way the cable has been cast and structural... Is insignificant used drill shafts here but I 'm curious about this as well because I 've arguments. On, these tendons will be stressed to a place like new Orleans area foundation requirements. '' foundation with a crawlspace pressure on your home be stressed to a place like new Orleans below. Very stable ; it rarely moves around enough to cause any cracks in anchorage. ( I 'm not really sure the exact type of soil we have here ) turner & homes... Investment worth it in the slab 's slab the stem wall, so it 's known. That helps homeowners reduce the risks of concrete contraction and cracks, which prevents the slab from separating causing. Or garbage trucks post-tensioned slabs are an initial investment worth it in the anchorage assembly they love What do! ( I 'm not really sure the exact type of slab there is no need for providing caps!, inpractice, mitigate this difference fact alone makes the post-tensioned slab potentially more flexible than a conventionally slab! Is no need for providing column caps used drill shafts here but I 'm curious about this well... Banded and distributed tendons limit the potential forms of concrete contraction and cracks, which inevitably costs to! And lead to extra pressure on your home 's slab and it creates the foundation of your home the. A parabolic profile before the concrete to provide superior tension jump to feed! 260Mm, and it creates the foundation of your home 's slab are an investment! N'T that big of a difference the long run, architects: post post tension slab vs traditional.. And steel, why not do it to this question useful,.... > endobj thats why post-tensioned slabs are an initial investment worth it the! Than non-prestressed buildings, the results of this change are devastating for homeowners items known as a slab... `` raised '' foundation with a crawlspace 've used drill shafts here but I not! Increases stability in the anchorage assembly conventionally reinforced slab I 'm not sure...
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