Hi all I have a warping problem with my hardwood flooring.

It was laid about 5 years ago and about 2.5hrs ago a small area start to warp and slightly cup. The installer replaced the affected area suggesting moisture must be coming up through the concrete, although they 'checked' for moisture before laying the floor. No water / fluid has ever been spilt on it. The planks are glued directly to the concrete.

In the last few months other areas have started to warp until one morning I found one section (different to the first) had raised by 1.5 inches (relieving the pressure on the other warped areas). This is clearly a big issue now and requires resolution.

I have had no external / internal works carried out in the last 5 years that might result in damper proofing damage. No water pipe run through the concrete floor. My concern is that the floor wasn't installed using the correct materials (glue / wood). How could I prove this? But more so; if I do have to pay for a new floor how can I ensure this doesn't re-occur in another 5 years, otherwise I'll lay a carpet Any advice would be welcome.

Well.
If the floor has laid there, in place, for 5 years; and only recently began to "warp", it would be extremely unlikely that it could be attributed to poor or incorrect installation.
Wood is basically inert in an inert environment. It will however, expand (warp) if subjected to increased moisture.
You say there has been nothing done in your home that could affect the MC of the floor, and that there are no hidden pipes in the concrete that may have developed leaks.
Where does that leave us? I suggest the most likely cause in your case is that the ambiant humidity level in your home has changed, either due to climatic changes in your region, or your de-humidifier, if in existance, has failed.

Check the perimeter for expansion gap. If the woods a hitting the walls that could be your problem. Check the rh of your home, have the installer pin meter the wood and see whats up. You could also check the mositure content of the slab aomewhere like in the mechanical room where there is exposed concrete or like behind a return air vent.

Concrete does not stay the same moisture content. If you have had lots of more rain than usual that could be getting into the slab. Check grading and water runoff around the house.

could be one of many things. But the obvious is the floor is expanding and wood only expands for one reason, moisture beyond what was present at the time of installation. Could be a leaky dishwaser, ice maker, commode ect. I have also see where afinish nail in the base has been shot right into a pipe just to sit there for anumber of years until it rust away and no longer plugs the hole causing a nice hard to find slow leak. Or often its just from ambiant humidity. Is the cupping in one area or is the entire floor cupped?

Thanks all for your advice. Just to be clear this hasn't all appeared over night, it's been a slow process of warpage over a number of years. It's only in the last few months the whole process has speeded up.

The cupping is not just in one place, but can be present in one board and the next board will be fine. I can live with this level of cupping if the warpage was fixed.

The ambiant humidity level in the house is an interesting route to investigate. The only real change is the addition of two small children in the house (more drying washing etc). I currently have no de-humidifier, but have ordered one earlier this week to rty and fix this problem. I'm supprised if this is the issue. I thought Oak flooring was meant to be robust! I understand if fluid is split on it or there is damp problem warpage will occur, but moisture in the air?? I'm by no means dissmissing this, just supprised at the materials sensitivity. The installer gave me no indication of this.

Will the de-humidifier reverse the warpage I currently have? If so how long does it typically take to make a difference (roughly)?

All wood is subject to expansion if increased MC occurs. Remember that as a live wood, it was approximately 80 percent water. During the drying process most of this removed. This causes a great reduction in dimension. BUT, given the opportunity, wood loves to return to that same moisture content and size.
Oak is indeed robust, but not inert; and what you are dealing with here is the wood's natural tendency to regain the moisture we stole from it during the drying process.
The de-humidifier you recently purchased will reverse the process the floor is currently undergoing IF humidity is the cause of the problem. If the warping is being caused by moisture in liquid form, i.e. a water leak, it doesn't stand a chance of keeping up with the expansion process.

Humidity is moisture in the air. The higher the humidity the more moisture available.
All Wood is hygroscopic. Meaning it will absorb and lose moisture. When wood absorbs moisture it swells, when wood loses moisture it shrinks.

Are you taking more vacations these days?
Closing the home up for weeks and turning off or way down, all HVAC systems?

Are you trying to say on energy cost by not running the HVAC as much as you once did years ago?