Two Post Lift Install Checklist: What Iowa Shops Get Wrong

A two post lift install checklist is the difference between a lift that goes in clean on day one and one that gets flagged, re-anchored, or moved three feet after the concrete is already drilled. We’re Auto Lift Services, based in Ames, and our crews run this same checklist on every two post lift install we do across Iowa, whether it’s a single bay in a farm shop or a six-bay dealership service drive. This article walks through the exact points we check before, during, and after installation so you know what to ask your installer, or what to check yourself if you’re planning a DIY setup.

Start Every Two Post Lift Install Checklist With The Slab

Before anything else on our two post lift install checklist, we’re under the shop looking at the concrete, not the ceiling. Most two post lifts need a slab that’s at least 4 inches thick with a compressive rating around 3,000 PSI, poured with rebar or mesh reinforcement, and free of expansion joints or old patch pours running through the anchor bolt pattern. A slab that looks solid on top can still be crumbly underneath from age, moisture, or a bad pour years ago, and that’s exactly where anchors pull loose under load.

We always ask for the age of the slab and, if it’s available, any pour documentation. If neither exists, we do a manual inspection and sometimes recommend a core test on older buildings. Skipping this step is the single most common reason we get called back out to re-anchor a lift that someone else installed. A two post lift install checklist that doesn’t start with slab verification isn’t really a checklist, it’s a guess, and guessing under a two-post lift holding up someone’s truck is not where you want to be.

Confirm Ceiling Height And Overhead Clearance

Overhead clearance gets overlooked constantly, especially in older Iowa buildings with lower trusses, ductwork, or lighting fixtures. Most asymmetric two post lifts need roughly 12 to 14 feet of clear space to fully raise a lifted truck or SUV, and that number climbs if you’re running taller trucks or adding a rack. We measure to the lowest obstruction in the swing radius, not just straight up, because a light fixture off to one side can still clip a mirror or antenna on the way up.

We also check door header height if the lift needs to roll a vehicle straight through, and we look at sprinkler head clearance since fire code in many Iowa municipalities requires a minimum gap between the lift’s fully raised height and any sprinkler head. Building inspectors flag this constantly on new commercial installs. Getting ceiling clearance wrong means a lift that technically fits on paper but can’t actually run a full-size pickup to full height, which defeats the purpose of buying commercial equipment in the first place.

Verify Power Requirements Before Delivery Day

Every two post lift install checklist we run includes power confirmation days before the truck shows up, not the morning of. Most units run on 220-volt single phase, though some commercial models need three phase, and running the wrong circuit means the lift sits in the crate while an electrician gets scheduled. We ask customers to confirm breaker size, outlet location relative to the lift’s motor housing, and whether the shop’s panel actually has capacity left, since older Iowa buildings sometimes don’t.

We also plan cord routing so it isn’t a trip hazard across the bay floor, and we check that the disconnect is within reach of the operator per OSHA guidance. None of this is complicated, but it’s easy to assume the power is fine and find out otherwise with a lift half-assembled. Confirming this ahead of time keeps installation day moving instead of turning into a half-day wait for a licensed electrician to show up.

Measure Bay Width And Column Spacing

Column spacing on a two post lift install checklist isn’t just about fitting the lift between your existing bays, it’s about leaving enough swing room for wide doors to open fully without hitting the columns or an adjacent lift. We measure actual usable bay width, not the number on the building plans, because support poles, tool chests, and wall-mounted equipment eat into that space fast in a real working shop.

We also account for the vehicle mix. A shop that services full-size dually trucks needs wider column spacing than one running mostly sedans and crossovers, and getting this wrong means doors that won’t open past 45 degrees or mirrors that clip the columns every time a technician drives in. We walk this measurement with the shop owner standing in the bay, not just on a tape measure and a drawing, because real-world clearance around tool carts and parts bins matters as much as the raw number.

Check Anchor Bolt Pattern And Torque Specs

Anchoring is where a two post lift install checklist earns its keep. Every lift model has a specific anchor bolt size, embedment depth, and torque spec from the manufacturer, and those numbers aren’t suggestions. We’ve seen lifts anchored with the wrong bolt diameter, undersized embedment, or bolts torqued by feel instead of with a calibrated torque wrench, and all three show up eventually as a column that rocks under load.

We also test each anchor after torquing, checking for any movement or spinning that indicates the hole was drilled into a void or a crack in the slab. If we hit an anchor that won’t seat properly, we relocate the hole rather than force it, even if that means adjusting the footprint slightly. Skipping the torque verification step is a shortcut that saves five minutes and risks the entire installation, and it’s one of the fastest ways to fail a certified inspection later.

Level The Columns And Square The Runway

A two post lift install checklist has to include column leveling, and this step gets rushed more than any other. Columns need to be plumb in two directions, not just eyeballed straight, and the base plates need full contact with the slab without shimming gaps that create flex under load. We use a level on every column face before final anchoring, and we double-check square by measuring diagonal distances between columns rather than trusting a single tape line.

Cable and hydraulic equalization also gets tested at this stage, running the lift empty through a few full cycles to confirm both sides rise and lower in sync. A lift that’s out of square or unequal side-to-side wears unevenly, stresses the cables or hydraulic lines faster, and creates a genuinely unsafe platform for a vehicle. This is the step where patience pays off, and it’s non-negotiable on every commercial job we run.

Run The Final Inspection And Documentation Pass

The last stage of any two post lift install checklist is documentation, and it’s the step most DIY installs skip entirely. We run a full load test, cycle the lift through multiple raises with a vehicle on it, check every safety lock engages properly, and confirm the arm restraints hold. We photograph anchor torque values, slab condition, and final measurements for the customer’s records, which matters for insurance and for resale value down the line.

If your shop is planning a new install, our two post lift install guide covers the broader planning process, and our two post install checklist breaks down the paperwork side in more detail. Home garage owners should also look at our home garage install prep checklist before ordering. A documented install is a defensible install if anything ever gets questioned later.