When it comes to glue down vinyl - it is a wonderful product - but tricky. The trick to it is the preparation. No one in the flooring world will offer warranty without the moisture readings/ratings of the concrete slab it was glued to. This can be known as 'ambient' humidity (relative humidity in both the concrete slab and the air can also be known as 'ambient' humidity). Gluing down to slabs takes HUGE amounts of knowledge and high-end adhesives. High end means $2-$3 per SQUARE FOOT! When gluing down, make sure the subfloor is tested for moisture (especially concrete) and you get a copy of that testing documentation. A great flooring installer will do this without being asked. A good flooring installer will do it when asked - and they will have the tools available. An average flooring guy won't have the tools but they "understand" the basics (won't be up to speed but can get a test done in a pinch) and the bad installers won't have a clue. Ambient humidity can mean "household living conditions". There are documents that tell you what that means (RH between 35%-55%; Temp between 55 F - 82F). If you cannot prove that you can maintain these situations, you the warranty (for any flooring product) is void. Good luck. The Moduleo may not be the issue. The conditions of the subfloor, the adhesive used, the amount of adhesive used and the lack of testing/proof of the conditions before, during and after install may be the issue.

The Carlton product has better specifications. It is thicker, wider and has one of the industries best/top rated click system ( 5G Valinge). The wear layer is 20mil. The finish is Aluminum Oxide. All three of these options outrank the Costco (middle of the road stuff) without breaking a sweat. If it were me, the Carlton vinyl carries much more than the Costco stuff. But it is your floor. And to be clear, a "good" vinyl floor (in Canada) should be MUCH CLOSER to $5/sf than $3/sf. You get what you pay for.

Sheet vinyl is the only 'vinyl' product that is 100% water proof. Even if it has a seam, the installer will 'weld' the seam (either chemically or thermally). That means a sheet product is EXCELLENT for 'leaky animals' (including humans in a splash zone). I'm not fond of sheet vinyl in a dining room (formal especially) but 'eat in kitchens' have often been covered in sheet vinyl. It all depends on the space. Vinyl planks have seams. Thousands of seams. Each click edge (4 sides of every plank) has a limitation. They can be water resistant (a large spill = gallon of milk = stand for 24 hours without issues) but are never 100% water proof. Ever. The gallon of milk may not seep through to the subfloor BUT the milk will settle in between the planks = no amount of cleaning will get it out. That's when odours occur. The milk, being an example, will sour and then you have a large patch of flooring that smells like sour milk (because you couldn't get every stick of milk out from between every single plank). The same thing happens with body fluids from pets. The planks can prevent the urine from reaching the SUBFLOOR but it won't stop it from pooling in between the planks (in the seams). I have a soft spot in my heart for sheet vinyl (for some weird reason). I think it is a product that has EXCELLENT properties for certain situations. Not everyone 'needs' those properties. That's why vinyl planks were invented. It makes people feel like they've done something 'good' for their home. Which can be very true. Your personal situation will dictate what you use. If you need water proof (ie. snow/rain has to be stopped at the doorways) then sheet is your go-to product. If you have an area that gets some splashes from the sink but nothing more than that, the vinyl planks do very well. Dog drinking bowls are known to cause 'bigger than we thought' water issues. And dogs will age. Sad but true. Photos of your space will help us understand what's going on.

I would recommend you install a reliable insulation level to prevent water. Of course, it would be great to increase a level of foundation but it is impossible to do now. That is why you can put a special membrane that will not absorb water and become working insulation. Try to google it, there are a lot of variants now on the market. As for a top layer, you can put anything you like. Hardwood is always good material. I have it as well. We bought several Persian rugs from the DorisLeslieBlau gallery. And they look great!