The cost will depend a lot on how much prep work they have to do. The concrete people are not going to do the prep work for nothing, they are going to charge for it. Depending on how much prep work needs to be done $6 per sq ft is not going to cover it. If by some chance you do find someone to do it that cheap, I would be hesitant in hiring them for fear they would do a crappy job. High quality workmanship does not come cheap.
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Another advantage of post-tension foundation design is construction efficiency. The use of post-tensioning can expedite the construction process as it requires fewer concrete materials and simplifies the installation of reinforcing tendons. This can lead to faster project completion times and potential cost savings.
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Post-tension foundation design does come with its own set of challenges that need to be considered by the contractor and end user.
- Cost: Post-tension foundations typically require specialized design, materials, and installation techniques, which can lead to higher upfront costs compared to traditional foundations. However, the long-term benefits may outweigh the initial investment.
- Expertise Required: Designing and constructing post-tension foundations require specialized engineering expertise and experienced contractors. Hiring professionals with knowledge in post-tensioning is crucial to ensure proper installation and performance.
- Maintenance Challenges: While post-tension foundations are generally durable, they may require periodic inspections to monitor the integrity of the tendons and address any potential issues. Maintenance and repairs, if needed, can be more complex and costly compared to conventional slab foundations.
- Limited DIY Options: Post-tensioning is a specialized technique that is typically not suitable for do-it-yourself (DIY) projects. Professional expertise and equipment are necessary to ensure the proper installation and tensioning of the tendons.
- Risk of Failure: Although rare, if post-tensioned tendons are not properly installed or maintained, there is a risk of failure. This could lead to structural issues, including cracks or even collapses. However, with proper design, installation, and ongoing maintenance, these risks can be minimized.
An additional limitation of post-tension slab design is that it can&#;t always be used. If there is not enough space for the equipment or a grade beam does not have a defined exterior face to place the dead and live sides of the wire for the tensioning operating, those instances will require conventional rebar in a slab-on-grade design.
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