If you want to spark a debate among construction professionals, just ask about the differences between shoring, reshoring, and backshoring. These terms may sound similar, but they serve distinct functions in different phases of the construction process. Understanding reshoring is critical for ensuring structural integrity, worker safety, and project efficiency.
What is Reshoring?
Reshoring is the process of placing additional supports beneath a concrete slab or structural element after the formwork has been stripped. Unlike initial shoring, which holds up fresh concrete, reshoring ensures that the slab carries its own weight while also supporting previously constructed loads.
For reshoring to function effectively, it must be carefully planned by a qualified engineer. The placement of reshores must follow strict guidelines to prevent excessive deflection, tensile stress, or structural instability. Because reshoring is not typically detailed in standard construction documents, engineering approval is essential.
When Do You Need Reshoring?
Reshoring is necessary when:
- The concrete slab has been stripped of its formwork but has not yet reached its full load-bearing strength.
- Additional load-bearing capacity is required to support newly constructed elements above.
- The construction sequence requires the early removal of original shoring.
- Structural integrity must be maintained while minimizing the number of shores in place.
Additionally, the timing of reshoring is critical. Reshores should only be installed once adjacent beams have been reshored to prevent uneven load distribution. Premature removal of reshores can compromise the stability of the structure.
Backshoring vs. Reshoring
Backshoring and reshoring both provide temporary support after formwork is removed, but their key difference lies in how they distribute weight:
- Backshoring: Supports a slab without allowing it to deflect, meaning the slab does not yet carry its own weight or any additional loads. Instead, the load is transferred through a series of shores down to the ground.
- Reshoring: Allows the slab to deflect naturally and support both its own weight and any additional loads.
The choice between backshoring and reshoring depends on project-specific factors such as load distribution, stripping sequence, and construction speed. Reshoring often requires fewer levels of shores, which frees up more space for ongoing construction activities.
The Importance of Shoring in Construction
Shoring plays a crucial role in construction by providing temporary support for concrete structures as they cure. Without proper shoring and reshoring, slabs could crack, sag, or even collapse.
Factors influencing shoring decisions include:
- Concrete Strength: The stronger the concrete, the sooner shoring can be removed.
- Load Requirements: The total weight the slab must support determines the type and number of shores needed.
- Environmental Conditions: Climate and weather impact how quickly concrete gains strength.
Using the right combination of shoring, reshoring, and backshoring ensures that a construction project remains safe and compliant with engineering best practices.
Begin Your Scaffolding Project With Our Experts Today
Choosing the right shoring and reshoring strategy can make all the difference in the success of your project. With over 40 years of industry experience and licensing in 48 states, our team at Scaff Engineering specializes in designing efficient, cost-effective shoring solutions. Our services include shoring, reshoring, and other structural support services tailored to your specific needs. Contact us today to discuss how we can support your next project with expert guidance and high-quality equipment.
