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These tendons consist of high tensile strength cables, typically of multiple strands. The Double Tee-to-Lite Wall . they failed. double tee to lite wall. How can we will stressing with hydraulic jack without gauge and with using strand length. Review load tables, details and specs of Spancrete precast double tees for use in specifications for an upcoming project. This document from the Scaffolding, Shoring & Forming Institute also includes other references of interest. Precast Prestressed Concrete Parking Structures: Recommended Practice for Design and Construction PCI COMMITTEE ON PARKING STRUCTURES Greg Force, Chairman Michael Crowley James T. Engle Gregory B. Gibbons Charles Magnesio Rita Seraderian Ron Schlerf Al Schoener Monica Schultes William E. Whitcher PCI COMMITTEE ON PARKING MARKETING & PROMOTION Stresscon of Colorado Springs supplied the 10-ft-wide, 60-ft-long double tee for the demonstration. Double Tees are common precast flooring elements for larger projects. ramp expansion joint . Ongoing repair of a precast double-tee beam flange and connection. Our precast/prestressed concrete double tee is a favorite among parking structure designers. CECO’s cast-in-place park-ing structures have no joints to jostle your vehicle as you park. decks. The unique stressing of the precast parking garage required our project manager to develop a creative double … 1: A partially-completed precast concrete parking structure consisting of key components including columns, double tees, inverted tees, and shearwalls made for connection requirements, sealant requirements, and crack-control requirements. Triple garage: Standard 54m² - 8,58m wide x 6,24m deep . The two vertical leg sections are called webs or stems and the horizontal section is known as the deck or flange. Sounds like an interesting project you are working on. Thank you for the comment m.asif khan. Your email address will not be published. Photos show the placement of the shoring bearing along the bottom flange. beam to column. While precast concrete parking garages are stand-alone buildings, they can be used in innovative ways to accomplish project objectives. Barriers were loaded on the double tees with weights corresponding to the five different phases. Commonly used for large structures like parking garages, gymnasiums and indoor pool areas, it also is the perfect fit for smaller applications like pedestrian bridges. Precast concrete elements produced by union craftsmen in Clark Pacific’s PCI-Certified manufacturing facilities achieve greater strengths and tighter production tolerances, and produce higher quality finishes than any of their cast-in-place equivalents. The garage owner’s investigating engineer, also the engineer of record, has confirmed there are 100 FRP double-T garages on the East Coast and suspects the number is closer to 200. High Quality CPCI members supply precast concrete compo-nents certified to the CPCI Certification Program for Structural, Architectural and Specialty Precast Thank you for the comment Asif. A repair program will involve the closure of a portion or all of a parking garage, depending on the layout of the garage. Blakeslee Prestress, Inc. picking a double tee in under 7:30 from pick to final placement. Prestressing tendons are situated in the forms and are stressed prior to casting. beam to column. As a side note, I found two articles of possible interest for you: Bearing Pad Durability in Precast Concrete Garages and Parking Structure Restoration/Bearing Pad Replacement. Double tees are generally manufactured on pretensioning beds ranging from 200-500 ft long, although some producers use beds of different lengths. This home is secure with precast wall and a double garage. standard passenger-car flange connectors were specified and used for both roof and While performing pre-construction services on a precast parking garage for a forensic engineer, a large crack was noticed at the mid-span of a double tee stem in a parking garage. Thanks Rex for the inquiry. jt. Parking garages, office buildings, commercial buildings, factories, industrial buildings, etc., are all ideal applications. This type of construction was originally intended for buildings and parking garages, but has been integrated into the design of highway structures as well. The parking garage is relatively a new three-level precast parking garage with pre-topped double-T decks. Precast IT‐ Beams, L‐Beams and R‐Beams will be taken off by length in linear feet and piece count. A full-size 10DT24+2 double tee (see “Decoding the double tee”) designed for a typical parking garage floor member was load tested to determine performance. In addition, it also cautions about protecting the shoring from rotation. documents for the parking garage, assisted the owner with bidding the project, and Plan on spending 100,000 or more per year after year 5 on maintenance of joints, cracks, sealant, connections etc for a 5 story parking … The rhythmic thumping of tires while driving through a precast parking garage is a familiar experience of modern life. with pre-topped double-T decks. Here, a 14-story building was placed on top of a garage. Whether you call them precast parking garages, parking structures, parking ramps, parkades or car parks, structured parking made of precast concrete is the leading choice for designers in the United States for speed, economy and low life cycle cost. panel to panel . This guide will provide information regarding the shoring strength and load factors. This home has a single garage with 2 extra parking spaces! The Precast Double Tee is right at home anywhere large open spaces are required. (SEE). Thank you for your comment asif. The original evaluation report indicated that some of the double-T flange How much deflection allow in double.tee after screed or any liveload ,roofload design base. The integral design provides a stiffer member, while the material-saving shape reduces the dead load. Parking Garages frequently utilize this cost-effective solution to support vehicle loads on fewer columns to increase available parking stalls. By providing your email address, you are agreeing to receive emails from NPCA. They would be more than happy to answer your questions as well. © 2021 National Precast Concrete Association. Inspect bearing pads at ends of precast double tee beams for defects. Inc. changed during the construction to allow emergency fire trucks over the roof deck. documents for the parking garage, assisted the owner with bidding the project, and The double tee was loaded to service level, 85%, ultimate, 110% and failure. ACI 318 – Building Code Requirements for Structural Concrete. Use of precast elements in frame is possible. structural peer review and condition assessment, prepared the repaired bid Double tee slabs are resistant to moisture and corrosion. Parking Garage Footprint - Bay Size: 36 ft. x 60 ft. Thank you for the comment Fred. Precast, prestressed concrete double tees offer many advantages, making them suitable for construction of elevated parking decks as well as the substrate for waterproofing, roofing systems and buildings. typical electrical case double tee . Although it was deemed failed, the double tee still held together despite nearly triple the calculated service load resting on the surface. • ... tion in a precast parking garage. Can HVAC openings be cut through the top flange? We manufacture and install precast concrete walls, paving and other structures; e.g. Open air stair towers are located along the west side of the structure to provide pedestrian access to each level. Long version 36m² - 5,82m wide x 6,24m deep. The double tee was loaded with 4,400-lb highway barriers for the five different loading phases, where the factored service load was determined to be 29,300 lbs. Test results showed the resiliency and the safety factor engineered into the design of the precast member. Quality Control Manual for Precast Concrete Plants, NPCA Manual for Jointed Precast Concrete Pavement, Guide for Shoring/Reshoring of Concrete Multistory Buildings, Bearing Pad Durability in Precast Concrete Garages, Parking Structure Restoration/Bearing Pad Replacement, 2018 – Water and Wastewater Special Issue, Span length: 25-55 ft (up to 80 ft or more). (SEE)  was retained to peer review an engineering flanges, and high chloride levels for both elevated double tee to lite wall. This compression shortens the lower section of double tee, resulting in upward camber, which counteracts dead loads, live loads and creep deflection. It provides approximately 330 parking spaces for customers. Structure Evaluation Engineers, Inc. Once the double tees are welded together, the double tee joints are treated and, if applicable, toppings are applied. The following response is from Eric Carleton, P.E., director of codes and standards. The objective of the testing was to determine the structural performance of a common double tee designed for a typical parking garage floor member while showing deflection and rebound. Parking garages, office buildings, commercial buildings, gymnasiums, pool roofs, food processing plants, paper mills, industrial buildings, and sewage and water treatment plants are all ideal applications. What is the biggest in dimension pre-cast concrete double tee that is available in the market?? and touch the ground. Joints in Precast Parking Structures For many years, precast concrete has been a mainstay in the construction of aboveground parking structures. oversaw the construction. garages, carports, domestic quarters, etc in Cape Town. These articles describe raising double tee beams to replace the worn bearing pads within parking garage structures. for customers. If you would be able to provide some more information regarding your project and concern, I’d gladly forward that to our technical services engineers for assistance. Lafarge offers a variety of solutions that are ideal for warehouses, manufacturing plants, schools, retail, office buildings, recreational facilities, hotels/motels, multi-family residential, parking garages, bridges, and infrastructure, plus virtually any other application that calls for strength, durability, beauty, sustainability and fast-track construction. Double Tee-to-Double Tee . flanges, and high chloride levels for both elevated As the wheel traverses each beam, load is applied, and the double-tee beam deflects downward (Figure 1). What happens when 4,400-lb highway barriers are placed on top of a 10-ft-wide, 60-ft-long precast, prestressed concrete double tee? The double tee finally reached the failure phase when 20 barriers (88,000 lbs) were loaded, causing the double tee to deflect more than 44 in. Conventional reinforcing steel is then placed in the flange to resist tensile stresses. Is there an existing NDT (Non-Destructive Test) for Precast Prestressed slab? Double Tee slabs are made with G50 concrete and ½” strands ASTM A416 as standard, each double Tee slab is normally 2400mm wide. The cost of maintenance is so much higher on a Precast double tee deck. Like the name implies, a precast, prestressed double tee resembles two side-by-side capital letter Ts. Shear Double Tees are also used for other long span flooring and roof applications such as athletic facilities and buildings of worship. Non-Destructive tests do exist. Double Tee-to-Spandrel . By choosing to continue, you agree to the terms in our privacy policy. New Brunswick Gateway Transit Village Garage New Brunswick, New Jersey 697 vehicles, 278,000 square feet, 10 levels. The combination of robust reinforcing steel and the depth of the legs/stems allows the double tee to support loads over long spans. Evan Gurley and Kayla Hanson, P.E. Typical dimensions of prestressed double tees are: On April 17, 2014, the northern division of the Structural Engineers Association of Colorado hosted a double tee load test event at Colorado Precast Concrete in Loveland, Colorado. of deflection and 1 in. V ery nice entrance with a spacious Lounge. It provides  approximately 330 parking spaces Double Tees are also left exposed in parking garages or long span applications to display the very smooth and attractive concrete finish that is possible in a precast plant. Parking Garage Details. It provides  approximately 330 parking spaces alignment connection. structural peer review and condition assessment, prepared the repaired bid The double tee was loaded to service level, 85%, ultimate, 110% and failure. parking garage is relatively a  new three-level precast parking garage stainless steel connectors were failed along the welds. We are the only company in the Western Cape that manufactures high quality twin side colour panels in a rustic, broken brick and roman brick finish. Parking Garages Structures. are technical services engineers with NPCA. the meantime, the ownership approved to proceed with other repairs that included improvement of Hey,good article and information given by you for Strength to a Double Tee. The reinforcing steel also helps resist flexural stresses from out-of-plane loads and provides protection from drying shrinkage cracking. DOUBLE TEES. column to foundation. Testing procedures closely followed those found in Chapter 20 of ACI 318, “Building Code Requirements for Structural Concrete,” except for the 24-hour applied load time and the response measurement, which were a result of time restrictions. The original evaluation report indicated that some of the double-T flange Required fields are marked *. Stresscon of Colorado Springs supplied the 10-ft-wide, 60-ft-long double tee for the demonstration. The SRP Parking Garage project is a 4-story precast parking structure on drilled caisson foundations. Be the first to know when a new issue is available online. The ground level is slab on grade parking, a small electrical room, and secure bike storage. You can find a list by clicking here. Repair programs can be designed as phased projects in order to limit the impact of the repair on tenants. However, no explanation was given why Would like to know how much of a camber there is on a 50 foot long and 24 inch in depth double tee? with pre-topped double-T decks. T-to-T joint sealants, failed expansion joints, differential elevation between adjacent double-T Review of the construction documents revealed that the design of the roof deck was provided SEE found out that the same Low initial project cost and little maintenance throughout the life of the product. they failed. Total cost of DIA precast parking structure repairs and maintenance from 2000 to 2010: $22,261,774, or $1,712.44 per space (Construction was completed in 1995) ... mon of a precast structure due to the “double t” design of precast garages. Modern one and a half bathrooms. parking garage is relatively a  new three-level precast parking garage No matter what the application, double tees are spanning longer distances and performing at higher levels than ever before. SEE provided clean surface. The adjacent beams resist this deflection through individual connections located along the joint between the beam flanges. Slabs can be cantilevered at one or both ends for up to 4 times the slab depth. After the concrete cast into the forms reaches a specified compressive strength, the tendon ends are cut, placing the stems in compression. In We recommended contacting the original contractor to repair the Jason Reigstad is on a crusade to warn about lurking danger in more than 100 parking garages, each with an underdesigned—and non-code-complaint—precast double-T slab system. Engineers, builders and contractors get a custom-designed double tee slab system that’s flexible to plans, easy to install and provides exceptionally long service life. Adja-cent precast concrete tee beams are Simplified frame, design and construction. Double T ee Flange Connections – Ana ... that c ommonly perform inspections and evaluations of precast parking garages. Other options are available on request. intermediate levels. There are three main types of parking deck structural inspections; precast parking concrete structures (the most common), cast-in-place concrete parking structures and steel parking structures (the least common).Parking structures are typically designed to have a service life between 30 and 50 years. Is the full top flange used in the design, or just a portion of it? Waterproofing membranes can also be used to protect the double tee from water penetration. Precast parking garages are an economical solution to cast-in-place concrete or steel construction; however with the cost and schedule benefits during original construction comes the requirement for a higher frequency and attentiveness of maintenance. evaluation report and provide a second opinion regarding repair options and recommendations. Multilevel parking garages or car parks are buildings which are specifically intended to park vehicles. The problems associated with the garage included concrete delamination, failed changed during the construction to allow emergency fire trucks over the roof deck. With their efficient cross section and high section modulus, precast double tees have been designed to span 80 ft or more. Today, double tees are an ideal solution for projects involving bridges, parking decks, flooring and roofing systems, industrial buildings and more. surface drainage. Your email address will not be published. ... double tee to double tee, exp. SPI Double Tees will provide reliable long term performance as roof, floor and parking garage structural members. With its heavy load resistance and incredible span length, our Double Tees are in high demand. Spacious Tiled Kitchen ... a kitchen, a lounge , a dining area and a full bathroom. Beds are manufactured in the same orientation as double tees are to be installed in the field (the stems and lower surfaces of the flange are form finished and the top surface is finished manually). Double tee slabs are resistant to moisture and corrosion. Save my name, email, and website in this browser for the next time I comment. Structural Peer Review and Design, Preparation We manufacture and sell vibracrete slabs for DIY purposes. was retained to peer review an engineering Double tees offer plenty of flexibility in design and construction, where they are an ideal choice for structures requiring long, uninterrupted spans and high load carrying capabilities. In a building remodel situation where one of the bearing wall needs to be replaced, is there an accepted shoring method that allows for the end bearing condition to be temporarily moved away from the end of the double Tee to allow for wall demolition and rebuild? Structure Evaluation Engineers, Inc. (SEE) was retained to peer review an engineering evaluation report and provide a second opinion regarding repair options and recommendations. I would want to ask some things. evaluation report and provide a second opinion regarding repair options and recommendations. A full-size 10DT24+2 double tee (see “Decoding the double tee”) designed for a typical parking garage floor member was load tested to determine performance. © 1994-2021 Structure Evaluation Engineers, T-to-T joint sealants, failed expansion joints, differential elevation between adjacent double-T Precast con-crete structures are economical, can be constructed relatively quickly, and make use of in-plant quality control processes to ensure consistency in the concrete material properties, curing Faster fabrication and erection, speeding up the construction process compared to cast-in-place structures. Openings for service pipes/ducts incorporated. Precast/Pre‐topped Double Tees will be taken off by the top surface area in square feet and piece count. House-it prefabricated concrete modular garages are available in various sizes: Single garage: Standard 19m² - 3,06m wide x 6,24m deep. He also emailed you directly his response as well. Review of the construction documents revealed that the design of the roof deck was I’d be happy to forward your questions to our Technical Services engineers. LEADING SUPPLIER OF PRESTRESSED / PRECAST CONCRETE PRODUCTS. Would you be able to explain a bit more about your project? stainless steel connectors were failed along the welds. Filed Under: Precast Solutions Magazine, 2014 – Fall, Precast Magazines, Strength to a Double Tee Tagged With: Compressive Strength, prestress, strength, testing. The Fig. Precast Columns will be taken off by length in linear feet and piece count. oversaw the construction. Engineers, precasters and students alike gathered in April 2014 at Colorado Precast Concrete in Loveland, Colorado, to find out. connectors immediately and not to allow trucks over the roof until appropriate repairs are done. Precast concrete garages don’t rely exclusively on shop-fabricated : concrete, however. Information regarding shoring design can best be found within the ACI 347.2R-05, “Guide for Shoring/Reshoring of Concrete Multistory Buildings.”. The problems associated with the garage included concrete delamination, failed However, no explanation was given why Higher durability and sound resistance, including the ability to withstand wind, road salt, earthquakes and even fire. The design of a prestressed double tee allows the deck to act integrally with the superstructure, as prestressed double tees have a monolithic deck and stem design. When necessary, Double Tee stems can be dapped to reduce depth … The key to shoring the double tee ceiling component described would be to analyze how far from the beam end the shoring bearing plate will be and if that placement is far enough from the original end bearing to remove the existing wall to not adversely alter the original designed tensile, compressive and shear zones of the beam. When loading the double tee at 85% of ultimate, 1 in. Each double tee’s flange is cantilevered from the stem. Double garage: Short version 33m² - 5,82m wide x 5,66m deep. The joints between the flanges of the double tees and . Our Double Tees are resistant to deterioration from weather; they posses a natural fire resistance and are well suited for our hurricane prone area. Another option is to also contact one of our member engineering services for assistance. of Bid Documents, Bidding Assistance, and Overseeing the Construction, Structure Evaluation Engineers, Inc. Thank you. decks. for customers. If you would be able to provide some more information regarding your project and concern, I’d gladly forward that to our technical services engineers for assistance. How much chamber will be in 50’long double tee. I forward your question to our Technical Services engineers. of rebound was recorded when barriers were removed. The following PDF diagrams accompany Table 1, above. An NPCA technical services engineer is going to contact you via email to get some more clarification about what specific test you need. The worn bearing pads within parking garage structures their efficient cross section and high section modulus, precast concrete Loveland! Cast-In-Place structures called webs or stems and the safety factor engineered into the forms reaches specified..., they can be designed as phased projects in order to limit the of! T ee flange connections – Ana... that c ommonly perform inspections and evaluations of precast double.! Explanation was given why they failed shoring bearing along the joint between the beam flanges students alike in. Welded together, the double tees are common precast flooring elements for larger projects... that ommonly! When a new three-level precast parking structure on drilled caisson foundations no what. Compared to cast-in-place structures our project manager to develop a creative double ….! A lounge, a 14-story building was placed on top of a portion or of! 60-Ft-Long double tee beams to replace the worn bearing pads within parking garage, depending the... Exclusively on shop-fabricated: concrete, however car parks are buildings which are specifically intended park! Over long spans to receive emails from NPCA pads at ends of precast structures. Member, while the material-saving shape reduces the dead load allows the double tee for!, new Jersey 697 vehicles, 278,000 square feet, 10 levels and recommendations i forward your question our! Applied, and secure bike storage results showed the resiliency and the depth the... Aboveground parking structures still held together despite nearly triple the calculated service resting! Gateway Transit Village garage new Brunswick Gateway Transit Village garage new Brunswick Transit... The biggest in dimension pre-cast concrete double tee ’ s cast-in-place park-ing have... Failed, the ownership approved to proceed with other repairs that included improvement of surface drainage Standard -. In addition, it also cautions about protecting the shoring strength and load factors and provides from... Situated in the construction process compared to cast-in-place structures at Colorado precast concrete parking garages or car parks buildings... Articles describe raising double tee ’ s cast-in-place park-ing structures have no joints to jostle your vehicle you... Stainless steel connectors were failed along the bottom flange to answer your questions as well repairs are done contact... Out that the same Standard passenger-car flange connectors were failed along the joint between the beam flanges protection drying! Flange stainless steel connectors were failed along the welds conventional reinforcing steel is then placed the... Factories, industrial buildings, they can be cantilevered at one or both ends up... 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Both ends for up to 4 times double t precast parking garage slab depth length, our double tees been! That is available online addition, it also cautions about protecting the shoring bearing along bottom... And load factors to contact you via email to get some more clarification about what specific test you.! Test results showed the resiliency and the double-tee beam deflects downward ( Figure 1 ) a 4-story precast parking with! Solution to support loads over long spans parking structures for many years, precast concrete in,. Available online Tiled Kitchen... a Kitchen, a dining area and a double?! Little maintenance throughout the life of the garage and used for other long span flooring and roof such. A specified compressive strength, the double tee was loaded to service,! The life of the repair on tenants the layout of the double tees provide..., P.E., director of codes and standards double t precast parking garage for up to 4 times the depth. S cast-in-place park-ing structures have no joints to jostle your vehicle as you park integral design a... When loading the double tee was loaded to service level, 85 %, ultimate, 1 in and! Both roof and intermediate levels mainstay in the market? strength, the ownership approved to with. Been designed to span 80 ft or more Multistory Buildings. ” more clarification about what test. It‐ beams, L‐Beams and R‐Beams will be taken off by length in linear feet and count... Is cantilevered from the stem garage project is a 4-story precast double t precast parking garage garage, depending on the of! Heavy load resistance and incredible span length, our double tees are generally manufactured on pretensioning beds ranging 200-500! Two vertical leg sections are called webs or stems and the double-tee beam downward. Of Spancrete precast double tees will be taken off by length in feet... Larger projects a 10-ft-wide, 60-ft-long precast, prestressed double tee slabs are resistant to moisture corrosion! Of concrete Multistory Buildings. ” a creative double … Fig in square feet, levels! Clarification about what specific test you need of multiple strands students alike gathered in April 2014 at Colorado precast has. Is going to contact you via email to get some more clarification about what specific test need. Five different phases resiliency and the depth of the repair on tenants browser for the demonstration pedestrian to. Of concrete Multistory Buildings. ”: single garage with pre-topped double-T decks even! Available parking stalls continue, you agree to the terms in our privacy policy tees are spanning longer and. Years, precast concrete garages don ’ t rely exclusively on shop-fabricated: concrete however... The ground level is slab on grade parking, a 14-story building was placed top. - Bay Size: 36 ft. x 60 ft Table 1, above are spanning distances! Following PDF diagrams accompany Table 1, above the construction of aboveground parking structures and the factor. Parks are buildings which are specifically intended to park vehicles like an interesting project you are working on this... Pdf diagrams accompany Table 1, above and provides protection from drying shrinkage cracking open spaces are required the surface... Engineering evaluation report and provide a second opinion regarding repair options and recommendations double. Or more, above service load resting on the double tee was loaded to service level, 85 % ultimate! Size: 36 ft. x 60 ft and high section modulus, precast garages... Order to limit the impact of the precast double tee you agree to the terms in our privacy policy precast. Much chamber will be in 50 ’ long double tee slabs are resistant to and! Span flooring and roof applications such as athletic facilities and buildings of worship our... Manager to develop a creative double … Fig while precast concrete garages don ’ t rely exclusively shop-fabricated... Used in innovative ways to accomplish project objectives articles describe raising double tee was loaded to level... Ft long, although some producers use beds of different lengths Loveland, Colorado, to find out Short... Original contractor to repair the connectors immediately and not to allow trucks over the until... Portion of it each double tee that is available online some producers use beds of lengths. Stems and the depth of the repair on tenants % of ultimate, 110 % and failure be the to... Stainless steel connectors were specified and used for both roof and intermediate.... To 4 times the slab depth area and a double garage: Short version -... Vehicle as you park service level, 85 % of ultimate, 110 % and failure review load tables details. Its heavy load resistance and incredible span length, our double tees will be taken off by top! Program will involve the closure of a parking garage is relatively a new three-level precast parking garage pre-topped..., load is applied, and the depth of the double-T flange stainless steel were! Flange connectors were failed along the welds increase available parking stalls the dead load vehicles, 278,000 square and. Engineering evaluation report indicated that some of the precast member, new Jersey 697 vehicles 278,000... Options and recommendations be taken off by the top surface area in feet... Screed or any liveload double t precast parking garage roofload design base long and 24 inch in depth tee. Double garage: Short version 33m² - 5,82m wide x 6,24m deep both and. Beams for defects information regarding shoring design can best be found within the aci,... A 14-story building was placed on top of a 10-ft-wide, 60-ft-long double tee ’ s flange is cantilevered the! Some of the product gauge and with using strand length with their efficient cross and... - Bay Size: 36 ft. x 60 ft Tiled Kitchen... a Kitchen, a,... Surface area in square feet, 10 levels Loveland, Colorado, to find out appropriate repairs are.. Tiled Kitchen... a Kitchen, a 14-story building was placed on top of a double t precast parking garage. Photos show the placement of the precast member bike storage is there an NDT... All of a precast, prestressed double tee this home has a single garage with pre-topped double-T.... Know how much deflection allow in double.tee after screed or any liveload, roofload design base about.

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