A sagging basement joist can make a finished room feel unsafe and uneven long before the damage becomes obvious. The right basement jack post depends on your available clearance, the load path, and whether you need compact crawlspace support or a much taller stand for a raised floor.
The Shortlist At A Glance
HYPERGIANT 4 Pack 7–11 Inch Basement Jack Posts, 12,000 LB Steel
HYPERGIANT 4 Pack 11–16 Inch Screw Jack Posts, 12,000 LB Steel
HYPERGIANT 4 Pack 16–21 Inch Basement Jack Posts, 12,000 LB Steel
Choziru 11.3–16.4 Inch Jack Post
DIOOSN House Floor Jack, 47–93 Inch Range, 16,070 lb Steel Support
YXGJDP 8-Pack Adjustable Mini Screw Jack Posts, 5–8 Inch
QARCMQ Steel Floor Jack, 11.5–20 Inch
The Strengths Of Each Pick
The 7–11 inch format makes this set useful where a standard floor support would be too tall. Four screw jack posts give you separate points of contact beneath joists or beams, while the compact range suits crawlspaces with limited working clearance. Compared with the 11–16 and 16–21 inch HYPERGIANT sets, this is the low-clearance option.
Each post uses steel construction with a listed 12,000-pound capacity per jack. That rating helps with load planning, although the real installation still depends on sound bearing surfaces, proper placement, and the structure above. For a shallow crawlspace with several uneven support points, the four-post format is practical.
Advantages To Know
- The 7–11 inch range fits unusually shallow floor gaps.
- Four posts support separate locations around a repair area.
- Steel construction and rust-resistant construction suit demanding leveling work.
- Individual adjustment makes uneven joists easier to address.
Things To Consider
- Measure the actual gap before ordering, since clearance outside 7–11 inches will not work.
- Treat 12,000 pounds as the per-jack ceiling, not a combined rating for the four-pack.
Quick Facts
Made For
This set suits homeowners and renovation crews working in shallow crawlspaces with joists or beams that need separate support points.
A Better Fit Elsewhere
The HYPERGIANT 4 Pack 11–16 Inch Screw Jack Posts suit you better when your measured clearance exceeds 11 inches.
An 11–16 inch working range sits in the useful middle ground between compact crawlspace posts and taller basement supports. The four-post arrangement suits a room with several support points, especially when each joist sits at a slightly different height. It offers more placement latitude than the 7–11 inch set without reaching the full height of the 16–21 inch version.
Each adjustable post has a listed capacity of 12,000 pounds and a rust-resistant steel body. The screw mechanism changes the height gradually, which is helpful for controlled leveling around beams and floor joists. In most repair projects, that middle range handles common basement clearances without forcing a very short or unusually tall support.
Notable Gains
- The 11–16 inch range covers many common floor and joist gaps.
- Gradual screw adjustment supports controlled leveling.
- Four posts support several uneven points at once.
- Rust-resistant steel suits basement conditions.
Worth Noting
- The 12,000-pound figure applies to each jack, not to the full set.
- Check that the base and contact area can carry the load path appropriately.
Key Specs
Built With In Mind
This four-pack fits renovation crews and homeowners handling several mid-height joist or beam support points in a typical basement.
Where Another Pick Shines
The HYPERGIANT 4 Pack 7–11 Inch Basement Jack Posts are a better fit for crawlspaces with less than 11 inches of clearance.
More clearance calls for a taller support, and the 16–21 inch range bridges gaps that the mid-height HYPERGIANT set cannot cover. Four posts make sense across a broader beam or several widely separated joists. For a raised basement floor with greater vertical space, this set feels more appropriate than the 7–11 inch option.
The rust-resistant steel posts each carry a stated 12,000-pound limit. Their threaded adjustment allows the top contact area to be set against the supported member after the base is positioned. Depending on your floor structure, you may also need a sound bearing surface beneath each post rather than relying on soft soil or a thin floor layer.
What Works In Its Favor
- The 16–21 inch range handles larger vertical gaps.
- Four posts suit multiple beam or joist locations.
- Threaded adjustment supports precise contact.
- The listed 12,000-pound rating fits heavier support planning.
Practical Considerations
- The taller range is unnecessary where the available gap is under 16 inches.
- Each base needs a stable bearing surface for a sensible support path.
Right Fit For
This set suits renovation professionals supporting raised basement floors, beams, and floor joists with 16 to 21 inches of clearance.
Swap It Out When
The DIOOSN House Floor Jack offers a better fit for mobile homes, raised floors, or support points requiring 47 to 93 inches of height.
For a focused support point, the Choziru 11.3–16.4 Inch Jack Post offers a clearly defined adjustment range. Its 11,000-pound capacity sits below the stated 12,000-pound rating of the comparable HYPERGIANT model, but the narrower dimensions may be useful where you need a specific fit under a joist or beam. That trade-off makes careful measurement important.
The heavy-duty steel construction and adjustable design suit renovation work involving floor joists, beams, and uneven structural areas. A single post is also easier to position under one critical member than a full four-post arrangement. For larger projects, however, you may need to repeat the placement at several separate points.
Where It Helps
- The 11.3–16.4 inch range supports controlled height changes.
- Steel construction suits structural support work.
- A single-post format targets one precise location.
Points To Note
- The 11,000-pound limit is lower than the listed rating of the 11–16 inch HYPERGIANT post.
- Confirm the measured clearance leaves room for fine adjustment near either end of the range.
Feature Snapshot
Who Should Grab It
This post suits experienced renovation crews needing one precisely measured support point beneath a joist or beam.
Another Choice May Suit
The HYPERGIANT 4 Pack 11–16 Inch Screw Jack Posts suit you better when you need four support points and a 12,000-pound per-jack rating.
Most of the compact posts on this list top out below 22 inches, so the DIOOSN House Floor Jack serves a different purpose. Its 47–93 inch range reaches from a raised floor toward the underside of a beam, making it relevant to mobile home leveling and tall basement work. That added reach comes with a larger support format.
The steel post has a listed capacity of 16,070 pounds and is designed for structural support rather than vehicle lifting. Its height can bridge a large vertical gap while the screw section handles the final positioning. You may find this most useful on a mobile home, elevated crawlspace, or renovation where the underside of the structure sits well above the floor.
A Strong Showing
- The 47–93 inch range handles unusually tall support gaps.
- A 16,070-pound rating supports heavier structural planning.
- Steel construction suits beam and floor support.
- The format works for mobile home leveling and renovation.
Trade Offs
- The large footprint and height make it less convenient for confined crawlspaces.
- It does not suit gaps that fall below 47 inches.
Technical Highlights
Best Suited To
This stand suits professionals handling mobile homes, elevated floors, and tall basement structures with substantial vertical clearance.
A Better Fit Elsewhere
The YXGJDP 8-Pack Adjustable Mini Screw Jack Posts are easier to handle when your gaps are only 5 to 8 inches tall.
Eight compact posts make this set practical for a small repair area with several shallow support points. The 5–8 inch screw adjustment is changed through a height nut, allowing the post to be positioned in place before final tightening. Compared with the 11–16 inch HYPERGIANT set, the YXGJDP fits a distinctly lower gap.
These posts are intended for beams and joists during construction, repairs, and stabilization work. The eight-pack gives you enough units to distribute support around an old house, porch, deck, or similar structure without needing a separate post for every location. The honest catch is the narrow range, which rewards careful measurement before installation.
Noteworthy Benefits
- Eight posts cover numerous small support points.
- The 5–8 inch range fits low floor gaps.
- In-place adjustment helps position the post under a joist.
- The compact format suits smaller repair areas.
Smaller Details To Check
- The narrow range leaves little margin for a gap that falls outside 5 to 8 inches.
- Plan the base positions carefully around pipes, ducts, and finished walls.
Who Will Love This
This eight-pack suits homeowners and repair crews handling multiple low-clearance support points around a small structural area.
Look Elsewhere When
The DIOOSN House Floor Jack is the better fit for mobile homes or elevated structures needing a much taller support.
The QARCMQ Steel Floor Jack covers an 11.5–20 inch span, giving you more height flexibility than the Choziru 11.3–16.4 Inch Jack Post. Carbon steel construction makes it a practical choice for residential leveling and renovation work involving beams, joists, attic framing, roof beams, or stair platforms. Its broad range also sits below the much taller DIOOSN design.
An adjustable support post, sometimes called a house jack, transfers a structural load through a screw mechanism to a stable bearing point. The QARCMQ design works as that support element rather than as a conventional lifting jack. Measure the full vertical distance and leave enough movement for fine positioning, especially near the 20-inch limit.
The Upside
- The 11.5–20 inch range covers many residential support gaps.
- Carbon steel provides a rigid support body.
- The post suits several structural leveling tasks.
Possible Compromises
- A gap close to 20 inches leaves little room for additional adjustment.
- The unit does not provide the extreme height range of the DIOOSN House Floor Jack.
Feature Facts
The Right Fit
This floor jack suits renovation crews needing one broad-range steel support for mixed-height residential framing and leveling tasks.
Consider Something Else When
The YXGJDP 8-Pack Adjustable Mini Screw Jack Posts are a better fit when you need eight small 5-to-8-inch supports instead of one taller post.
What Matters Before You Order A Basement Jack Post
Measure The Full Vertical Gap
Measure from the intended base surface to the underside of the member being supported, then add room for adjustment and placement. A compact post may fit beneath a joist but crowd nearby pipes, ducts, and walls. Measure several points because floors and beams are rarely perfectly even.
Match Capacity To The Load Path
Load capacity is the maximum supported by one jack, not the entire structure. Compare the listed rating with the member above, the number of support points, and the condition of the surrounding structure. A post only works as part of a sound path through its base, screw section, contact plate, and supported member.
Inspect Base And Head Contact
The bearing surface is the area that carries the load into the ground or supporting structure. It must be stable and capable of handling the concentrated force. Likewise, the top plate should meet the joist or beam squarely rather than pressing against an edge or leaving the post angled.
Plan Access Around Each Post
Screw adjustment usually needs room to turn the nut and raise or lower the threaded section. Leave enough working space for installation, periodic checks, and later adjustments. Crowded crawlspaces can make a taller post easier to use but harder to position, so access deserves a close look before purchase.
Two Details Worth Checking Before Purchase
Mistakes Worth Dodging
Choosing by appearance alone is a common error because the visible height does not describe the full adjustment range. Measure the narrowest and widest gaps, count the required posts, and check the base conditions. A larger capacity cannot compensate for an inadequate bearing surface.
What Separates Premium From Basic
Higher-cost models may command more because of greater load ratings, longer adjustment ranges, heavier steel, or broader application support. The extra capability matters when your measurements approach a product’s limits. For a shallow, straightforward gap, a compact set may provide everything you need.
Frequently Asked Questions
What Is A Basement Jack Post?
A basement jack post is an adjustable steel support used beneath floor joists, beams, and similar structural members. It uses a threaded screw section to change height and provide controlled support at a prepared bearing point.
How Do I Measure For A Basement Jack Post?
Measure the distance from the proposed base to the underside of the member you intend to support. Check several locations, include working clearance, and make sure the post can reach the required height without being forced into position.
Which Height Range Should I Choose?
Choose a range that fully contains the measured gap with some adjustment space left. The YXGJDP set covers 5–8 inches, the HYPERGIANT sets cover 7–21 inches across three versions, and the DIOOSN model handles much taller 47–93 inch gaps.
Do All Basement Jack Posts Have The Same Capacity?
No. Listed capacities range from 11,000 pounds for the Choziru post to 12,000 pounds for each HYPERGIANT jack and 16,070 pounds for the DIOOSN model. Treat each number as a per-post reference and confirm the complete support plan.
Are Basement Jack Posts Conventional Floor Jacks?
No. A house jack post supports a structure at a fixed bearing point, while a conventional floor jack raises or lowers equipment. These posts are intended for controlled leveling and structural support applications.
Wrap Up
The most useful basement jack post is the one that matches your measured clearance, base conditions, and support layout. Low crawlspaces call for the compact YXGJDP or 7–11 inch HYPERGIANT set, while taller structures point toward the 16–21 inch or DIOOSN option. Measure first, then choose the range that leaves room for controlled adjustment.