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Author Topic: Addition on PT Slab Foundation  (Read 8049 times)

Je3ss & Chris

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Addition on PT Slab Foundation
« on: July 24, 2009, 02:30:41 PM »

We moved into our home late last year.  We are getting ready to do some remodeling and have been working with a local contractor.  The plan is to add a bedroom onto the rear and reconfigure part of the existing space to add an additional bathroom.

The contractor plans to cut a hole in the slab so his plumber can tie into the existing drains for the new bath.  When we purchased, we had a home inspection.  I looked at the report today to refresh my memory.  The inspector said the house is built on a post-tension slab foundation.  He also mentions in the report that modifications to this type of foundation can be extremely difficult and should be done only under the supervision of a structural engineer.

When I asked the contractor about this issue, he said not to worry - they cut slabs all the time for this type of addition.

Is this something we should be worried about?  If so, who should we talk to for more info?

Jess & Chris
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CREIA Inspector

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Re: Addition on PT Slab Foundation
« Reply #1 on: July 24, 2009, 02:41:10 PM »

Jess & Chris

I would follow your inspector's recommendation. Post cable tension concrete foundation slabs can be modified, but the modification should only be performed under the supervision of a structural engineer AFTER the slab has been x-rayed.  The x-ray procedure will determine the exact location of the cables and will be used as a guide for where to cut into the concrete slab and where not to cut. 

Post tension cables in a residential slab foundation are under extreme tension, hence the name "cable tension slab" and can be very dangerous and cause serious damage including personal injury if accidently cut.

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Yashwantsingh

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Re: Addition on PT Slab Foundation
« Reply #2 on: July 14, 2012, 03:35:35 AM »

I have got a similar kind of problem. I have recently got PT slab constructed and now I require to place some optical cable drawing machines on this slab. Please suggest what to do?
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Linda

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Re: Addition on PT Slab Foundation
« Reply #3 on: June 26, 2013, 07:35:41 AM »

We plan on replacing an island of cabinets onto our kitchen floor.  We have a post tension slab.  Can we go ahead and install using the special screws that are used for concrete? Or is there a possibility of hitting the rebar?  What are your suggestions?
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