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Often asked: Is my slab post tension?

How to tell if you have a post tension slab. Most homes that have post tension slabs have a sign that is stamped into a concrete garage floor, often near the edge of the garage door right in plain sight. Older homes with post tension slabs may have a plastic or paper sign fastened to the wall.

Can I drill into a post tension slab?

PT slabs on ground can be placed and stamped just like with any other concrete slab. The only concern is to always remember not to cut or drill into post-tensioned concrete slabs, since once a tendon has been cut, it is very difficult to repair.

What year did post tension slabs start?

The first post-tensioning in U.S. building construction was in the mid- to late 1950s in buildings using the lift- slab construction method.

Does post tension slab crack?

Post-tensioned concrete slabs are typically expected to crack less than other slabs because post-tensioning produces a compressive stress that must be exceeded before enough tensile stress develops to cause cracking. For a 100,000 ft2 post-tensioned slab, this would result in an estimated 900 lineal ft of cracks.

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What happens if you cut a post tension slab?

Once the concrete is poured and sets, the cables are tensioned. Once tensioned, the cables cannot be de-tensioned. The hazard exists when workers cut into the slab and rupture the tensioned cable. Do NOT cut into a post tensioned slab if there is a chance you will rupture a cable.

How do I know if my slab is post tension?

Most homes that have post tension slabs have a sign that is stamped into a concrete garage floor, often near the edge of the garage door right in plain sight. What is this? Older homes with post tension slabs may have a plastic or paper sign fastened to the wall.

What is the benefit of a post tension slab?

It reduces or eliminates shrinkage cracking -therefore no joints, or fewer joints, are needed. Cracks that do form are held tightly together. It allows slabs and other structural members to be thinner. It allows us to build slabs on expansive or soft soils.

How long have post tension slabs been used?

The use of post tension cables has been around for many years. Back in the 1960 there was limited use in concrete foundations in residential construction, but very little. In states like California, Texas, Nevada and Arizona the use of post tension slabs have increased tremendously in the last ten years.

What year did post tension slabs start in Arizona?

In 1987, Jonnie Deremo learned this method from the person that constructed the first PT courts in Northern California, and in 1988 General Acrylics constructed some of the first PT concrete courts in Arizona.

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How long does post tension slab last?

Conventional concrete & rebar foundations last about 20-30 years before failure begins to occur. Post-tension slabs are lasting about 15-20 years and are failing at a much higher rate. Post-tension slabs are created with concrete trenches around the perimeter of the house where the external walls will be placed.

Can a post tension slab be repaired?

Post tension (PT) tendon systems are primarily used for large slab construction projects. Since the early 1950’s, post tension tendons have been used in the design of concrete structures. For such critical structural element, the repair should only be completed using a certified, experienced repair contractor.

How deep are the cables in a post tension slab?

The plan maps show the rebar at 3″ depth, and the post-tension cables at 8″ depth. Discerning a post-tension cable from rebar generally requires scanning a larger area to properly understand the layout of structural elements in a slab. When in doubt, mark it out and avoid it!

What is the difference between normal slab and post tension slab?

ØNormal slab is reinforced concrete(RCC) structural element whereas post-tension slab is per-stressed concrete (PSC) structure. In Post tension slab the reinforcement is replaced with cables/ steel tendons. ØIt requires more formwork when compared with the flat slab.

Can you cut prestressed concrete?

Cutting or minor trimmings at the ends are okay and should not cause any problems but cutting near the centre can affect the lintel’s load capacity. It is important to consult a structural engineer before any cutting is done.

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How much does it cost to fix post tension cable?

The cost of a single cable repair will typically range from $800 to $1,200 and does not include the cost of other concrete repair. In most slab systems, the cables are spaced about 30 to 36 inches apart. As a result, a significant expense for cable repairs can be experienced.

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