Trick: When placing the concrete anchors, either the L bolts or lag shields, mark a length of 2 X 4 with the position of the studs, lay it beside the concrete pad and insert the concrete bolts between marks. Unfortunately, there are challenges involved with the installation of post-installed anchors, such as: Training is the greatest preventive step for meeting or mitigating most of these challenges. Generally speaking, the potential for corrosion is heavily influenced by the galvanic activity that is likely to occur. When all else fails, keep in mind that every anchor manufacturer wants a successful anchor installation and is usually happy to address installation questions and concerns. Sometimes a product that is best for concrete is not the same one that is best for CMU and vice-versa. Keep in mind that although each manufacturer has specific manufacturer’s installation instructions, there are certain factors influencing anchor choice that are consistent across the industry. Concrete Anchors. Concrete Fasteners, Inc. 1231 E 26th St Cleveland, OH 44114 United States of America Call us: 1-216-357-7433 Hex Washer Head Concrete Screw $ 0.08 – $ 0.52. Depending on the level of preservative used on the wood, zinc or mechanically galvanized anchors are most appropriate. Photo 4A: Close-up of concrete sleeve anchors. Many designers require anchor products to have a valid evaluation report regardless of their use. Consequently, in order to anchor a post to concrete, you need to paint its bottom section with wood primer, as to make sure it will resist against moisture.Sand the bottom section with a band sander, it it doesn’t fit in the anchors. These Anchors are also recommended for installation of wall mounted barre brackets into a concrete wall. Are the trades (the concrete and framing subcontractors) coordinating beforehand? In this article, we’ll walk you through the process of selecting an anchor so you can be better equipped on future projects where post-installed anchors are needed or even just favored in lieu of cast-in-place anchors. Lag shield concrete anchors use a bolt and sleeve that insert in a hole. Need to cross reference a brand name? Jobsite ObstaclesThe final consideration in anchor selection is something that is difficult to predict, much less control: what happens on the jobsite. Quick cure times can sometimes be an advantage, although acrylics can sometimes cure too quickly at warmer temperatures, so the installer needs to know the expected gel time and cure time. Installers using adhesives to install deep reinforcing bars for rebar dowelling applications will prefer an epoxy product over an acrylic due to the longer gel time (working time). Shop concrete anchors and a variety of hardware products online at Lowes.com. Which adhesive should be used? ACI Certifying Post-Installed Anchor Installation Inspectors, Japanese Firm Makes Environmental Concrete From Volcanic Ash, Six Problems with Post-Tensioning Force Specifications, Concrete Construction February-March 2020, Anthony Schirripa Receives AIA 2021 Edward C. Kemper Award, Pascale Sablan Wins AIA 2021 Whitney M. Young Jr. Award, Moody Nolan Wins 2021 AIA Architecture Firm Award, HGTV Unveils 25th Edition of the HGTV Dream Home, Battle Over Gas Hookup Regulation Intensifies in California, How Increased Work-From-Home Opportunities Benefit the Housing Market, Gift Guide 2020: Sparks of Joy for Architects and Designers. Select options. The sleeves pinch the sides of the predrilled hole and get tighter as … Showing 1–28 of 51 results. The farther apart the metals are on the table, the greater the difference in electrochemical potential and the more rapidly corrosion will occur. Flat Head Concrete Screw Phillips Drive $ 0.08 – $ 0.52. Thickness of the concrete is another important factor that is sometimes overlooked. Step 1 – Decide Which Type of Concrete Anchor to Use There are many different types of concrete anchors on the market, but two types of anchors are used more often than the rest: cast-in-place anchors and wedge anchors. Bolts can be removed and reused in the same hole or used in a new hole along with a replacement expander nut (sold separately). Is a special inspector going to be on site to verify proper installation? Acrylics can often be installed at temperatures below freezing. This is because the smaller/thinner items will usually corrode first. Mechanical anchors are typically the best choice for overhead installations; adhesive anchors can be used with reduced capacity but are typically not recommended. SET-3G can be used to install rebar dowels in cracked or uncracked concrete, which brings us to the next major group of selection factors, building code requirements. However, in-service conditions are important, too. Epoxy adhesives are best for temperate conditions or warmer weather, since the standard cure time allows for longer installation times. Removable-Bolt Anchors for Concrete Turn the bolt to expand the nut for a secure hold in concrete. CONCRETE ANCHORING IS A CRAFT not a science. Shop concrete anchors and a variety of hardware products online at Lowes.com. Setting a cast-in-place anchor in just the right location can be a daunting task. Another common potentially corrosive environment occurs when anchors are used to attach preservative-treated (often called “pressure treated”) wood sill plates to concrete. Review: ‘Nail Your Numbers: A Path to Skilled Construction Estimating and Bidding'. As a general rule, these distances are a function of the anchor diameter — the larger the diameter, the farther away from the edge an expansion anchor needs to be placed. Anchor CapacitiesThe capacity of each anchor is, of course, different. Chemical Anchors - Epoxy and Hybrid AdhesivesMechanical Concrete AnchorsCast-in Anchor ChannelCast-In Anchors View our anchor selector chart Anchor ConfigurationsSome other considerations in anchor selection are how close the anchors will be placed to the edge of the concrete, the spacing between anchors, and the thickness of the substrate. Although post-installed anchors are commonly used in concrete construction, choosing the right anchor for a given application is not as simple as it might appear. Other exposures ranging from dry exterior to wet service to elevated service will be classified as medium to high to severe, respectively. Depending on the design requirements, anchors qualified for cracked concrete or uncracked concrete could be specified. The significant corrosion often visible in marine environments, for example, is due to the highly corrosive reaction caused by the salt in sea water. Instead, cracked concrete anchors are literally tested in a section of concrete with a crack running through the plane of the anchor when tension tested. As often as required by the Statement of Special Inspection, which depends on the size of the job. Note that for most adhesives installed into water-saturated concrete, the cure time must be doubled. The rating on Table 1 corresponds to the type of steel or steel coating required on the anchor. Even when rainwater is present only during an anchor installation or the curing process, the anchor capacity can be influenced negatively. Special Inspection is designated, usually on the Statement of Special Inspection, as “continuous” or “periodic.” How often is periodic? Concrete fasteners are referred to as expansion type concrete fasteners. The S-7 anchor consists of a reliable torque controlled expansion anchor assembly similar to the Spin-Lock, however, the S-7 drill hole diameter is the same size as the anchor stud diameter. These anchors are often used to anchor machinery. Masonry and concrete anchor types are considered light-duty, medium-duty or heavy-duty, based on how much weight they can support. In order to gain cracked concrete approvals, these anchors must be qualified through rigorous testing in accordance with ACI 355.2 (mechanical anchors) or ACI 355.4 (adhesive anchors). Wedge Anchors Zinc Plated $ 0.64 – $ 22.90. Concrete wedge anchors are used to fasten or secure many different kinds of things to concrete and masonry. Good detailing practices can help reduce the galvanic corrosion potential of anchors. Which anchors perform best at close edge distances, expansion anchors or screw anchors? Click & collect in as little as a minute. Use anchors and metals with similar electrochemical potential. Concrete Fasteners ‑ It's Our Specialty. Building code requirements3. Typically, this is a more important factor during installation and throughout the curing process. Minimizing Concrete Floor Damage When Removing Anchors Problem The removal of traditional mechanical concrete anchors can be time consuming and leave the floor damaged. As a craft, it is imperative that the “craftsman” learn as much as possible about Galvanic corrosion occurs when two electrochemically dissimilar materials contact each other in the presence of an electrolyte (in this case, water) that acts as a conductive path for metal ions to move from anodic to cathodic metals. Tapcon Concrete screw anchors draw from its unique ability to TAP its own … Building Code RequirementsThe International Building Code (IBC) refers to the American Concrete Institute (specifically ACI 318-14) for Building Code Requirements for Structural Concrete. For anchors close to the edge, screw anchors or adhesive anchors are well-suited since they do not impose expansion forces on the concrete. The only one that does not is the concrete screw. First, the in-service exposure conditions determine the necessary corrosion resistance of the anchor. Note that these provisions apply only to adhesive anchors, not to mechanical anchors. http://www.confast.com/products/thunderstud-anchor.aspx This is called a “galvanic couple,” with the more anodic metal corroding. We can provide you with a wider selection at a better price than big box retailers. This is to simulate what would happen in a seismic event if the concrete experienced high loading and cracked in the anchor location. We’ve been selling high-quality concrete fasteners for years. Chemical and mechanical anchors for concrete and masonry applications Hilti engineering creates more anchor options that deliver maximum productivity, performance and reliability in any application. 1/4 in. SubstratesAs we alluded to above, the material into which the anchor is being installed is called the substrate. Anchor capacities6. By doing this you will avoid having the concrete bolt end up under a stud position. Anchors should be installed into holes that are shallower than the depth of the concrete. Unfortunately, these mistakes happen, but as G.I. Ensure that the anchor is the anode when dissimilar metals are present. Sleeve anchors have either a screw head (Photo 4) or a bolt head. It can be considered a craft because of the tremendous variables found in concrete, the tolerances of the carbide drills and anchors, the tools used to set them and most importantly the skill of the installer. A manufacturer’s testing in accordance with ASTM standards may classify the adhesive as: Similarly, adhesive anchor installations in damp, wet, or submerged environments can be problematic. STEP 2: HOLE REPAIR The sealing of the hole consists of milling, cleaning and sealing with adherent filling materials; usually polyurethane based mortars are used to guarantee a degree of flexibility in the repair. For most applications, an Engineer of Record should be consulted to ensure that the chosen anchor, diameter, and embedment depth are appropriate for loading that will be resisted by the anchor. One alternative is to hammer the remaining portion of the What is the concentration of these chemicals? Cracked concrete does not mean that the concrete is cracked already. Mechanical anchors are often more appropriate for thinner concrete sections, though this is not always the case. Corrosion also increases with increasing conductivity of the electrolyte, such as salt water. First, recognize that epoxy is required for rebar installations. In projects such as water treatment plants, factories, or even wineries, where adhesive anchors will be exposed to chemicals, the same factors need to be considered. Not sure what you are looking for? In order to gain cracked concrete approvals, these anchors must be qualified through rigorous testing in accordance with ACI 355.2 (mechanical anchors) or ACI 355.4 (adhesive anchors). The time period between inspections is related to the critical nature of the installation or the number of anchors installed on the jobsite and is often determined by the Engineer of Record. Chemical Anchors - Epoxy and Hybrid Adhesives Mechanical Concrete Anchors Cast-in … The ankerbolt performs well in both solid and hollow materials. In areas where the anchor design is governed by wind, however, cracked concrete does not necessarily need to be assumed in the design methodology. 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Again, for water-saturated concrete the cure time should be doubled. Tapcon Concrete screw anchors draw from its unique ability to TAP its own threads into Concrete, making it an excellent alternative to expansion anchors, plugs and lag shields. This scenario often requires anchors in the medium corrosion-resistance class. These concrete anchor bolts, or bolt anchors for wood, are available in several sizes and will hold up to 200 lbs. The gel time, or “working time,” for adhesives is substantially shorter than the cure time. The concrete screwor Tapcon® actually taps or cuts threads into the base material as it is inserted into the hole. While cast-in anchors in concrete are an excellent choice, what are the chances they will be installed correctly and in the proper place? You can trust us to quickly deliver the right fasteners for the right price for any project. Is the adhesive resistant to the chemicals to which it will be exposed? Look to the anchor manufacturer’s product selection guide to discover which anchors (adhesive, screw, or expansion) are most suitable for the different substrates. After you ensure the post anchors are locked into position, you could proceed to installing the wooden posts. Not only does drilling through the substrate create a waterproofing or installation problem, it can also influence the capacity of the anchor. Will the correct nozzle for the adhesive be used? Although we won’t go into depth here, often screw anchors and expansion anchors can have similar shear and tension capacities. Concrete Construction: Resources for contractors and specifiers including construction methods, materials and practices, by Scott Rutledge, Anchor Business Unit Manager, Hilti, Find products, contact information and articles about, More about Simpson Strong-Tie Anchor Systems. The self tapping action provides a positive anchorage in concrete, brick, stone and blocks. Lag shield concrete anchors may be the easiest anchor to remove: as the bolt is removed, the anchor may contract, allowing it to be pulled from the hole. We highly recommend installing our floor mounted ballet barre brackets into the concrete using these anchors with our supplied Lag Bolts. They are used in construction, maintenance, mining and other situations where people are working at height. Special equipment, such as dust-extraction drill bits attached to properly rated vacuums with HEPA filters to mitigate hole-cleaning problems or diminish the possibility of substantial OSHA fines, can help too. Hex-Washer-Head Concrete Anchors (75-Pack) As the original Concrete screw anchor that As the original Concrete screw anchor that revolutionized the construction world, Tapcon brand Concrete anchors deliver the ease of use, superior precision and the unparalleled performance that professionals demand. Find brand names equivalent products. Temporary anchors (those in corrosive conditions for less than six months) fall into the low corrosion-resistance classification since they typically don’t have substantial time to corrode. For example, using Simpson Strong-Tie epoxies, SET-3G epoxy specifically states that it can be installed in a water-filled hole and at concrete temperatures between 40°F and 100°F. Table 2 shows the galvanic potential of different metals. Is the installer going to pay attention to the proper installation temperature range of the adhesives? Chemical and mechanical anchors for concrete and masonry applications Hilti engineering creates anchor options that deliver maximum productivity, performance and reliability in any application. They derive their holding values from friction. Substrates (what is the anchor being installed into)4. Although not entirely clear in the IBC, periodic inspection is typically necessary at the beginning of the anchor installations on the project and at intervals during anchor installations on the same project. Special inspection is to be conducted by a qualified special inspector, or other authorized personnel, who has been specifically trained and authorized by the AHJ (Authority Having Jurisdiction) to perform special inspections. Depending on the manufacturer and the diameter, even large-diameter screw anchors can be as close as 1¾ inches from the edge and 3 inches apart (center to center). Include 4 Anchors . Will OSHA respirable silica dust requirements be observed? Find concrete anchors at Lowe's today. The friction is obtained by the outward pressure created by expanding the anchor against the walls of the hole that is drilled in the base material. All expansion anchors work on this principle. You can trust us to quickly deliver the right fasteners for the right price for any project. These female type anchors would include the: drop-in anchor , machine screw anchor , double expansion & single expansion anchors . Diameter: 5/16" Length: Long (1 3/4") Drill Size: 1/2 inch . x 2-3/4 in. Try the Product Finder. Some manufacturers have done extensive testing with these preservative chemicals on the anchors and may have specific recommendations. Are they going to drill the holes properly? Setting a cast-in-place anchor in just the right location is so difficult that post-installed anchors are now the preferred method for attaching wood, steel, and cold-formed steel components to concrete. S-7 Concrete Anchors. In fact, the concrete is often only 21 days old and meets all specifications. How to install concrete wedge anchors. Anchoring to concrete shall be in accordance with ACI 318 as amended in Section 1905, and applies to cast-in (headed bolts, headed studs and hooked J- or L-bolts), post-installed expansion (torque-controlled and displacement-controlled), undercut and adhesive anchors. Also known as rod anchors, they're often used with threaded rod to hang pipe and wiring. Each type of anchor has a minimum embedment- th… We’ve been selling high-quality concrete fasteners for years. Expansion anchors, since they work by exerting an expansive force on the concrete, need to be farther from the edge and farther apart from each other. The same material that takes 24 hours to cure at 14°F might take only 20 minutes to cure at 100°F. In many applications, screw anchors are effective and efficient. In regions where earthquake loads need to be considered, the anchors must be suitable for use in “cracked concrete,” since seismic design assumes the concrete will be cracked. Keep in mind that the corrosion resistance of both the adhesive and the threaded rod insert used with the adhesive needs to be taken into consideration. Environmental conditions2. Installing an anchor is an easy process that requires some specific equipment and only a little bit of time. Hot Products From The Concrete Anchors Category Buy Heavy Duty Fixings at Screwfix.com. Another building code requirement, this time specifically listed in the International Building Code (IBC), is that structural post-installed anchors in hardened concrete must have at least “periodic special inspections” during installation. In addition, many require cracked concrete–approved anchors to be used even in low seismic areas. Wedge anchors, also known as expansion bolts and expansion anchors, secure themselves to concrete using a mechanical wedging effect at the end of the anchor. Select options. In wet or water-filled holes, choose an adhesive anchor that is approved for the identified condition: As you might expect, the temperature of the concrete or substrate can adversely affect the anchor. As you go forward in your designs and installations, I recommend starting with the worst, most restrictive factor (like a highly corrosive condition) and then narrowing in on the best choice after that has been determined. Attaching the bottom plate of a wall to a concrete floor can be done using any of the following methods: Cut nails (aka masonry nails) Concrete nails; Concrete screws; Wedge anchors; Construction Adhesive; No matter the reason, attaching a 2×4 bottom plate to the concrete … A steel anchor is stubborn and its removal will usually cause damage to the concrete floor. Suitable for a variety of materials including concrete, stone and brickwork. Joe said, “knowing is half the battle,” and perhaps we can all make better decisions on the next project. It’s so difficult, in fact, that post-installed anchors are now becoming the preferred method for attaching wood, steel, and cold-formed steel components to concrete instead of cast-in-place anchors. This could be normal-weight concrete, lightweight concrete, concrete over metal deck, concrete masonry units (CMU, either grouted or hollow), unreinforced masonry (URM), or even clay brick. Concrete anchors are secured to concrete walls, columns, floors, and decks to create a secure anchor point for personal fall arrest equipment when working at height. res20120803158882047874967 As the bolt threads into the lag shield, it expands, fastening it to the concrete. If an adhesive anchor is used overhead, ACI 318-14 (R22.214.171.124) requires a 0.55 strength reduction factor for sustained tension loading and that the adhesive installation be performed by an ACI certified installer unless the Engineer of Record designates otherwise. Typical epoxy cure time varies from 72 hours at 50°F to 24 hours at 100°F. Interior exposure only (dry service) falls into the low corrosion-resistance classification shown in Table 1, while an application in an unprotected ocean-front location falls under the severe classification. Generally, acrylic adhesives are great for cold weather installations but will cure very quickly at higher temperatures. Any product with a valid evaluation report stating cracked concrete approval can be used for seismic, wind, life safety, or static use and meets the intent of the building code.