Home » How to Replace a Rusting Lally Column in the Basement: A Step-by-Step Guide

How to Replace a Rusting Lally Column in the Basement: A Step-by-Step Guide

Rusting lally columns in the basement can be a cause for concern, jeopardizing both the structural integrity of your home and the safety of its occupants. Addressing a rusting lally column promptly is crucial to prevent further deterioration and potential hazards. In this comprehensive guide, we will walk you through the process of replacing a rusting lally column in your basement, ensuring a secure and stable foundation for your home.

Understanding the reason behind rusting lally column in basement

Before embarking on the replacement process, it’s essential to assess the extent of the rust damage. Superficial rust may be treatable, while extensive corrosion could require a complete replacement. Consult with a structural engineer or a professional contractor to determine the severity of the issue and the best course of action.

What if you can avoid replacement. Read this

Step 1: Safety First

Before beginning any repair work, prioritize safety. Wear appropriate personal protective equipment, including gloves, safety goggles, and a dust mask, to shield yourself from dust and debris.

Jack post as a temporary support
Jack post as a temporary support source

Step 2: Removing the Old Column

  1. Support: Temporarily support the load above the lally column using adjustable temporary supports. This is crucial to ensure the safety of the structure during the replacement process. You can use jack post also.
  2. Detach: Carefully detach any connections, such as brackets or plates, securing the lally column to the beam and the floor. Use appropriate tools and techniques to prevent damage to surrounding components.
  3. Cutting: If the rust damage is extensive and irreparable, use a reciprocating saw or a cutting torch to carefully cut through the column. Take utmost care to avoid damaging adjacent structural elements.
Removing a lally column

Step 3: Installation of the New Lally Column

  1. Measure: Accurately measure the height required for the new lally column, accounting for any variations in floor level.
  2. Cutting: If necessary, cut the new lally column to the appropriate length using a metal cutting tool.
  3. Positioning: Place the new lally column in the designated position, ensuring it is level and plumb. Double-check the measurements before proceeding.
  4. Attach: Securely attach the new lally column to the beam and the floor using appropriate brackets, plates, or other connectors. Follow manufacturer guidelines and ensure a snug fit.

Step 4: Finishing Touches

  1. Insulation: Consider adding insulation around the base of the new lally column to prevent moisture buildup and potential rusting in the future.
  2. Painting: Apply a rust-resistant primer to the new lally column to provide an added layer of protection against corrosion. Follow up with multiple coats of paint suitable for metal surfaces.
  3. Check and Adjust: Verify that the new lally column is properly aligned and supporting the load. Make any necessary adjustments to ensure stability.


Replacing a rusting lally column in the basement is a task that demands careful planning, meticulous execution, and a strong commitment to safety. By following this step-by-step guide, you can address the issue of a rusting lally column, safeguard your home’s structural integrity, and provide peace of mind for years to come. Remember, when dealing with structural elements, it’s always wise to seek professional guidance and expertise to ensure the highest level of safety and effectiveness in the replacement process.

Related Posts

Leave a Reply

Your email address will not be published. Required fields are marked *