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External modification is typically adding the strengthening materials under the existing slab. This is usually cheaper, but may reduce the usable headroom substantially.
External strengthening methods include adding structural steel beams, post tension cables and newer composite materials such as carbon fiber cloth or strips. These can be used in combination using each material where it has the best application. Working with an experienced structural engineering and strengthening contractor who is certified to install the latest high strength materials will lead to the most cost effective strengthening project.
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