Car Lift Concrete Requirements by Model: Slab Thickness and PSI for 2-Post and 4-Post Lifts

Bottom line: there is no single “standard” slab for a car lift. Across the 79 2-post and 4-post lift models in the two tables below (67 table entries), each taken from the manufacturer’s own installation manual, the minimum slab thickness runs from 100 mm (about 3.9″) to 6.5″, and, where the manual states it in PSI, the minimum concrete strength runs from 3,000 to 4,000 PSI. Some manuals in the conflicting-figures list call for much more. Even lifts of the same capacity differ: among 10,000 lb two-post lifts, AMGO BP-10: 4″; iDEAL TP10KAC-DX: 4-1/4″; Katool KT-H100: 5.9″ (150 mm); Atlas OHX10000X: 6″. Check the manual for the exact model you are buying before you pour or drill.

Use this page in three steps: find your exact model below, compare its minimums with the slab you actually have, and confirm with the installation manual before you order. If your lift is a 2-post and you want the full walkthrough of checking an existing floor, our 2-post lift concrete requirements guide covers it step by step.

Key findings from the tables (8 manufacturers):

• Capacity does not predict the slab. Among 12,000 lb two-post lifts, Katool KT-H120D and Tuxedo TP12KC-D list 4″; Atlas BP12000X lists 6″ and Atlas PVL12 160 mm (≈6.3″).
• Same brand, same capacity, different slab: Katool’s 12,000 lb KT-H120D lists 4″, its AM120SD 150 mm; Atlas’s 8,000 lb PRO-8000 lists 4″, the PRO-8000 EXT 6″ (both figures for anchored installs).
• Heavier is not always thicker: AMGO’s 40,000 lb PRO-40 lists 120 mm (≈4.7″); Katool’s 15,000 lb KT-M150D two-post lists 6.5″.
• Only two table entries list 4,000 PSI: Triumph NTO-9AE and NTO-10A.

What the thickness and PSI figures mean

Each row gives the two numbers the manufacturer sets for the concrete under the lift, plus any extra conditions from the same manual.

• Minimum slab thickness is how thick the concrete must be where the lift is installed. Figures are shown as the manual writes them, in inches or millimeters, with a conversion in parentheses where the manual uses millimeters.
• Minimum concrete strength is compressive strength, shown in PSI where the manual gives PSI (Notes flag other units). Specified strength is based on 28-day test results (ACI), so it describes cured concrete, not a fresh pour.
• Notes carry extra conditions from the manual, such as how far the slab must extend from the anchors or how far cracks must be from the base plate. They are part of the requirement.

Both minimums apply together: a slab that is thick enough but too weak, or strong enough but too thin, does not meet the manual.

4-post lift concrete requirements by model

Many 4-post storage lifts can stand free on the floor. Where the manual says so, the thickness shown applies when you anchor the lift; the manual for each model says when anchoring is required.

Jump to brand: AMGO · Atlas · Daytona · iDEAL · Katool · Tuxedo

2-post lift concrete requirements by model

Two-post lifts must be anchored to the slab, and the anchors hold the columns against the tipping forces of the load, so thickness and strength matter most here.

Jump to brand: AMGO · Atlas · iDEAL · Katool · Launch · Triumph · Tuxedo

Models whose manuals give conflicting figures

• Atlas Apex 8: 4-1/4″ in the important notice; 6″ in the anchoring sections.
• Atlas PVL10: 4-1/4″ in the important notice; 4″ in the floor-requirement section.
• Atlas PVL14: 4-1/4″ in the important notice; 6″ in the installation-surface section.
• Atlas PVL15: 6″ in the important notice; 6-1/3″ in the floor-requirement section.
• Katool KT-M120: 6.5″ in the floor-requirements table; 150 mm in the installation section.
• Katool KT-M140XD (14,000 lb): 5.9″ / 150 mm, but the table row is labelled “11,000 Lb Models”; Katool’s KT-M120 (12,000 lb) and KT-M150D (15,000 lb) manuals say 6.5″.
• Katool KT-4H120X: 100 mm in the specifications; 150 mm in the installation section.
• Katool KT-4H150: 100 mm (3.93″) in the specifications; concrete pads at least 24″ (600 mm) thick in the installation section.
• Daytona LTPF9, LTPF12, LTPO15 and LTPA12: 4″ of 3,500 PSI steel-reinforced concrete in the floor section; C30 foundations more than 600 mm (LTPO15, LTPA12) or 800 mm (LTPF9, LTPF12) deep in the installation section; the LTPA12 flyer says a minimum of 6″ at 4,000 PSI.
• Daytona LTPA10: 6.3″ at 3,000 PSI in the current manual; 6″ at 4,000 PSI on the flyer and product FAQ.
• Launch TLT240SB / TLT240SC: 108 mm (4-1/4″) in one 2016 revision; 250 mm in another.

Models not listed here are ones whose current manual we could not obtain, or whose published documents do not state a slab requirement. For those, ask the manufacturer for the installation manual before you buy.

General guidance that applies to every lift

The installation manual governs

The Automotive Lift Institute’s installation standard (ANSI/ALI ALIS) covers “concrete work, foundations, soil conditions”, and ALI directs owners to “refer the lift manufacturer’s installation and service procedures for specific guidance” (ALI, ANSI/ALI ALIS). ALI’s public guidance does not publish one slab thickness for all lifts, which is why the numbers above differ by brand and model.

Existing slabs: measure, don’t assume

Before you compare your floor with the table, find out what you actually have. First rule out a post-tensioned slab (see Post-tensioned slabs below): never drill one until a qualified technician has located the cables. Construction records may list slab thickness and the concrete mix. A small test hole drilled through the slab near a planned column location shows real thickness. A core sample, lab-tested, is the way to confirm compressive strength. Our 2-post concrete guide walks through each option.

BendPak, a lift maker whose products are not in the table, requires that existing floors be test drilled to confirm actual thickness and that a core sample confirm compressive strength (BendPak concrete foundation requirements). Rotary describes five inches of 3,000 PSI concrete as its own “general rule” while telling buyers to confirm each lift’s requirements (Rotary FAQ).

Cracks, joints and slab edges

Several manuals set distances from defects. Atlas’s 9KOHX and 9KBPX manuals call for no cracks within 36″ of the base plate. Several Tuxedo, iDEAL and Atlas manuals call for anchors at least 6″ from any slab edge or seam. BendPak says never to install a lift over expansion or control joints and to keep anchors at least 6 in. from them.

Post-tensioned slabs

Post-tensioned slabs contain steel cables under tension. BendPak notes that post-tension slabs in many homes are indicated by a warning stamped into the concrete, often near the garage door, and warns: “Never drill or cut into a Post-Tension Concrete Foundation!” A qualified technician must locate the cables before any drilling (BendPak). If you are not sure what kind of slab you have, find out before you drill.

Curing time varies by manufacturer

Concrete strength is specified on a 28-day basis: the American Concrete Institute notes that specified compressive strength is based on 28-day test results unless the construction documents say otherwise (ACI FAQ). Lift manuals set their own waits. Many AMGO manuals say to let new concrete solidify at least 15 days. Several Atlas manuals say at least 20 or 21 days, while Atlas’s 9KOHX and 9KBPX, like several Tuxedo, iDEAL and Triumph manuals, call for final anchor tightening after a 28-day cure. Launch’s TLT210 manual says 30 days. Several Katool manuals give both 7 and 28 days in the same document. Follow the manual for your model.

Reinforcement

Manuals disagree on reinforcement. Several Tuxedo and iDEAL manuals, the Triumph C-7000 and NTO-11A, most Katool 2-post manuals, Katool’s KT-4H120X and KT-4H150 manuals and Daytona’s LTPF9, LTPF12, LTPO15 and LTPA12 manuals call for steel-reinforced concrete. AMGO’s manuals, Katool’s KT-4H850, KT-4H950 and KT-4H110 manuals and Daytona’s LFPP and LTPA10 manuals say “without reinforcing steel bars”. Others do not mention it. Follow your model’s manual.

Thinner than required?

Several manuals describe cutting out the slab under each column and pouring thicker footings when the floor falls short; the size, depth and strength of those pads differ by model, so use the figures in your manual or have a concrete professional design them.

What to do next

1. Find your model in the 4-post or 2-post table and note its thickness, strength and any notes. If it is in the conflicting-figures list or not listed, get the requirement from the manufacturer first.
2. Measure your slab: check records and rule out post-tension cables first (never drill a post-tensioned slab until a qualified technician has located them), then drill a test hole for thickness, and core-test for strength unless construction records document it.
3. Check the conditions: cracks, joints, slab edges and cure time, as your manual specifies.
4. If the floor falls short, plan footings to your manual's figures or have a concrete professional design them before installation.
5. Get the current manual for the exact model before you order. It governs over any summary, including this one.

Shopping for a lift? Browse 2-post car lifts or 4-post car lifts. Questions about a specific model's requirements? Call or text (470) 208-2754 or email support@pitstop-pro.com.

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