The Other Side of the Tendon: Limits, Pitfalls, and How to Avoid Them

Post-tensioning comes with a few drawbacks despite its strength benefits. One major disadvantage is reduced flexibility for future modifications – cutting or drilling into a post-tensioned slab is risky, since severing a tensioned cable can weaken the structure and is extremely dangerous. Post-tensioned concrete also requires specialized design and installation, which can increase costs and limit the pool of qualified contractors compared to standard rebar construction . Additionally, careful maintenance is needed over time; if the steel tendons corrode or get damaged, repairs can be complex and costly (as noted by Neumann Monson Architects) Although post-tensioned concrete can be limiting, other structural systems present a degree of inflexibility. A more traditional concrete system requires more columns, which can also complicate modifications. You and your design team should discuss the potential for future changes to determine the right approach.

At the same time, post-tensioned concrete can add complexity to construction. It requires precision and specialized knowledge, potentially limiting your options to a smaller set of contractors. .

Custom Listing Stlyes

• Complexity → Solution: PTI-certified crews + third-party special inspection.
• Corrosion sensitivity → Solution: edge-anchorage waterproofing audits every 5 years.
• Difficult slab modifications → Solution: mandatory GPR scan & tendon-detension procedure before coring.
• Up-front cost variance → show a cost curve graphic vs. quantity of columns removed (PT pays back quickly once span > 25 ft).

Is PT right for my retrofit?.