Understanding Floor Joist Jacks: A Comprehensive Guide
Floor joist jacks, also known as floor jack posts or leveling screws, are essential components in maintaining the structural integrity and leveling of your home. They are designed to support and adjust the load-bearing joists in your floor, ensuring your home remains safe, stable, and level. In this guide, we'll delve into the world of floor joist jacks, focusing on their purpose, types, installation, and where to find them, including at Lowe's.
Why Use Floor Joist Jacks?
Floor joist jacks serve two primary purposes: leveling and supporting. Over time, homes can settle or shift due to various factors such as soil erosion, moisture, or age. This can lead to uneven floors, sloping floors, or even structural damage. Floor joist jacks help to mitigate these issues by:
- Leveling floors and preventing sloping
- Supporting and redistributing the weight of your home
- Preventing further settling and damage
- Enhancing the overall safety and stability of your home
Types of Floor Joist Jacks
Floor joist jacks come in various types, each designed to cater to different needs and situations. The most common types are:

- Adjustable Screw Jacks: These are the most common type, featuring a threaded rod that allows for precise height adjustment.
- Hydraulic Jacks: These use hydraulic pressure to lift and support heavy loads. They are ideal for situations where a significant amount of weight needs to be lifted or supported.
- Turnbuckle Jacks: These consist of a turnbuckle that can be adjusted to raise or lower the jack. They are simple to use but offer less precise adjustment than screw jacks.
Installing Floor Joist Jacks: A Step-by-Step Guide
Installing floor joist jacks is a straightforward process that can be done by a DIY enthusiast. Here's a step-by-step guide:
- Locate the joist that needs to be lifted. This is typically done by finding the low spot in your floor.
- Position the jack under the joist, ensuring it's centered and stable.
- Raise the jack slowly and evenly, using a level to ensure the floor is being lifted evenly.
- Once the desired height is reached, secure the jack in place. This is typically done with a nut and washer, or by tightening a set screw.
- Check the level of the floor again to ensure it's even and stable.
Where to Buy Floor Joist Jacks: Lowe's and Beyond
Floor joist jacks are widely available at home improvement stores, hardware stores, and online retailers. Lowe's, for instance, offers a variety of floor joist jacks from different brands, catering to various needs and budgets. Here are a few options you might find at Lowe's:
| Brand | Product | Type | Load Capacity |
|---|---|---|---|
| Simpson Strong-Tie | Strong-Drive Adjustable Screw Jack | Adjustable Screw Jack | Up to 2,000 lbs |
| Zoro | Hydraulic Floor Jack | Hydraulic Jack | Up to 6,000 lbs |
| Grainger | Turnbuckle Floor Jack | Turnbuckle Jack | Up to 2,500 lbs |
Before making a purchase, ensure you understand the specific needs of your project and choose a jack that can safely support the load. Always follow the manufacturer's instructions for safe and effective use.

Conclusion
Floor joist jacks are indispensable tools for maintaining the structural integrity and leveling of your home. Whether you're dealing with a sloping floor, uneven joists, or want to prevent further settling, floor joist jacks offer a simple, effective, and affordable solution. With a variety of types available at stores like Lowe's, you're sure to find a jack that meets your needs. So, don't let a sagging floor get you down - lift it up with a floor joist jack!






















