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Mislocated Anchor Rods

Every erectors worst nightmare is getting to a jobsite where the concrete has already been poured only to find that the anchor bolts aren't in the right place. Luckily, our manufacturing partners over at American Buildings have put together a quick guide about what to do when you find yourself staring at a set of mislocated anchor rods.

A Pre-engineered metal building base place and column is shown installed with anchor bolts

Contractors are no strangers to solving unforeseen issues out in the field, and sometimes misplaced anchor rods are one of those issues. If you are starting to erect your metal building columns and find that the anchor rods are not in the correct location — what are possible solutions? Knowing what options are available and who needs to approve the modifications can save precious time in the construction schedule.

A pre-engineered metal building's anchor bolt detail
Figure 1

It is important to start with an understanding of who is responsible for approving

modifications to the anchor rods and columns. For modifications to the columns or base

plates, contact American Buildings prior to making any changes. Once notified, we can often provide a quick solution and our engineers can make sure no additional issues are created with the proposed modification. For modifications to the anchor rods, a design

professional outside of American will have to be responsible for approving changes. This will most likely be the Engineer of Record or the original foundation engineer.

A pre-engineered metal building's anchor bolt detail
Figure 2

Mislocated anchor rods are the most common field issue we see. Their exact location will determine what solutions are available. A great way to communicate the new locations is to provide a dimensioned sketch using the original anchor rod detail (Figure 1). When the anchor rods are within a few inches of the correct location, the preferred solution will be a welded plate washer. This will be a flat plate prepped with the new hole locations and will be welded on top of the base plate, which has had the original holes slotted to fit the anchor rods through (Figure 2). If the plate washer cannot fit, the next option may be to remove the base plate and replace it with a plate with holes matching the poured anchor rod pattern.

At times, the mispoured anchor rods cannot be accommodated by modifying the base plate. We often find the next best solution is to use epoxy anchor rods. Adding epoxy anchor rods will require coordination with the American Buildings

engineer and the engineer responsible for the foundation design. The foundation engineer will determine if the epoxy anchor rods have the required capacity and will work with American’s engineer to verify the placement. When placing epoxy anchor rods will not work, the last option may be digging up and resetting new anchor rods. With the cost and time implications of mispoured anchor rods, it’s best to take extra steps to mitigate it from ever happening. American Buildings will use common anchor rod patterns when possible to help simplify the job. In addition to that, American has recently changed the standard pattern for ¾” anchor rods to allow more space between bolts and more flexibility for field fixes. For contractors, the use of anchor rod templates and field surveys can ensure proper placement.

Still have questions? Give the experts at Peak Building Systems a call today at (720)282-5074 today to discuss this topic more. Ready to get started? Design your building by using our 3D Designer Here!

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