Smart Jacks and Crawl Space Support Posts
Smart Jacks, crawl space support posts, adjustable shoring posts, and steel column supports are all different names for the same basic idea: a post installed under a floor system to help support sagging beams, weak joists, or overloaded crawl space framing.
At Foundation Masters, LLC, we do not treat these posts as a simple sales product. A support post is only as reliable as the engineering behind it, the load it is carrying, and the footing it sits on. If the base is wrong, the post can settle, shift, or require repeated adjustment.
Do Not Set Smart Jacks on Deck Blocks or Loose Gravel
A common mistake is setting a crawl space support post on a small concrete deck block, loose gravel, patio stone, or an undersized pad. That may look acceptable in a sales photo, but it is not a proper structural repair.
The shoring post is only as strong as the footer below it. If the footer settles, the floor settles with it.
Why the Footing Matters
Before choosing a Smart Jack or crawl space support post, the first question should be: what load is this post carrying? The second question should be: what is the post bearing on?
In Florida, this matters even more because many crawl spaces are affected by sandy soils, shallow groundwater, moisture, organic material, and unstable bearing conditions. A small deck block or gravel base may be acceptable for very light temporary support, but it is not the same as a properly designed structural footing.
Foundation Masters Minimum Standard
For structural crawl space support posts, Foundation Masters generally recommends a properly prepared concrete footer, not a deck block.
- Concrete footing: typically 24″ x 24″ x 4″ minimum, depending on load and soil conditions
- Concrete strength: high-strength concrete, commonly 5000 PSI where appropriate
- Reinforcement: #4 rebar or engineered reinforcement when required
- Bearing: placed on properly prepared, stable soil
- Adjustment: posts adjusted carefully to avoid damaging framing or finishes above
When Crawl Space Support Posts Are Needed
Smart Jacks or crawl space support posts may be used when a home has sagging floors, undersized beams, deteriorated joists, wood rot, settlement, or weak interior support points. However, the post itself is only one part of the repair.
- Sagging or bouncing floors
- Interior beam settlement
- Weak or deteriorated crawl space framing
- Improper previous repairs
- Moisture-related wood damage
- Temporary shoring during structural repairs
- Supplemental support under overloaded floor systems
Smart Jacks Are Not a Substitute for Engineering
A support post should not be installed just because a floor is sagging. The actual cause needs to be identified. The problem may be wood rot, poor drainage, foundation settlement, weak beams, crawl space moisture, undersized framing, or soil movement below the support area.
That is why Foundation Masters approaches crawl space support as a structural repair, not just a post installation. Our team evaluates the load path, framing condition, soil support, moisture conditions, and long-term performance of the repair.
Related services include drainage and waterproofing, structural engineering, and foundation repair throughout Florida.
Proper Smart Jack Installation
A proper crawl space support repair usually includes more than simply placing a steel post under a beam. The repair may require framing repairs, beam reinforcement, footing installation, drainage correction, wood replacement, or moisture control.
- Inspect the crawl space framing and floor system.
- Identify the cause of settlement, sagging, or movement.
- Determine the required support locations and load path.
- Install proper concrete footings instead of deck blocks or loose gravel.
- Install adjustable steel support posts.
- Carefully lift or stabilize the floor system as conditions allow.
- Address moisture, drainage, or wood deterioration if present.
Schedule a Crawl Space Support Inspection
If your floor is sagging, bouncing, uneven, or supported by questionable posts, blocks, or temporary jacks, Foundation Masters can inspect the condition and recommend a permanent repair plan.
Call Foundation Masters: 813-614-1718
Contact Foundation Masters for a Crawl Space Support Inspection