Solid anything doesn't work with slab foundations. What type of foundaton does your home have?

Our island is finished with Good Stuff for Wood. We've been in almost five years and have only redone the finish once (need to do it again soon). No problems in any areas, including the wood edge around undermount sink. This is where we ordered ours: Here is a link that might be useful: Good Stuff for Wood

Connie Kempf; my similar issues with store, salesman, inspectors, and even manufacturer and the regional representative!!! They don't understand the engineering aspects of vinyl flooring! In my case the problem involved temperature in a HVAC control room with sunlight on the flooring. They had NO clue even though I engineered a successful solution even though they said it could not be done with vinyl!! They don't understand the specific application and the engineering aspects of vinyl flooring! You can see my nightmare earlier in this post dealing with the various industry personnel. The inspectors have a conflict of interest and are not trained well enough either. As I mentioned you can find my rant on the vinyl flooring industry earlier in this thread. Please note, before buying one should read ALL marketing materials and WARRANTY info which is where ALL their dirty secrets are contradicted and are hidden in the fine print!!! Be forewarned you probably knew more then anyone of them combined. I believe most manufacturers do not recommend rolling loads (esp wheel chairs) and the problems are only compounded if individual is over weight and sub-floor has defects. It's my opinion, the salesman should have stopped the sale when he heard you would be running a wheel chair (esp a heavy power chair) across the floor. From my experience none of the staff to which I was exposed had any knowledge of proper application and installation of vinyl. Even in my case the first thing they blamed for flooring failure was on the sub-floor and floor joists. Reality, the sub-floor was within the flooring manufacturer published spec. Obviously since I'm not there I can't comment on your specific floor. Also note, I'm a self proclaimed vinyl installer beginner, with no prior flooring experience! (my only prior training is in electronic and computer science engineering with 45+ years experience solving engineering issues as Staff Engineer, I can now claim I have retrained myself on vinyl). SJ McCarthy is a regular poster here and may chime in with some helpful suggestions for your situation ?

That sounds pretty nasty. You've used the word "laminate" but you've also used WPC in the description. They are normally two different things. Laminate is a photograph sitting on top of fibre board. The WPC is traditionally a vinyl product. They can LOOK the same but they have VERY different installation requirements. First and foremost...the subfloor "flatness" rating. It may or may not have been addressed COMPLETELY. If this is LAMINATE it can handle a bit more humps and bumps but it should still be fairly flat. If this is VINYL then the concrete must be PERFECTLY flat. And I mean REALLY REALLY FLAT. Secondly, and perhaps I should have lead with this, vinyl does NOT like UNDERPAD!!!! Oh dear. Shaw CLEARLY states (on website) that it allows TWO underpads with their vinyl/WPC products: https://shawfloors.com/flooring/how-to/vinyl/underlayment/floorte-vinyl-underlayment Underpads for vinyl are VERY specific and VERY thin. I mean STUPID thin. Like 1.2mm - 2mm thick and that is IT. If they are the wrong material (squishy foamy stuff normally used under laminate) then the vinyl will MOVE and shift and bounce and even crackle and pop (sound familiar?). If it is the wrong THICKNESS...see above. If anything other than the TWO (2) allowable underpads was used, then the warranty is void. You will want to check your invoice. If Costco does NOT carry the two underpads...then they probably used something else. And part of the noise issue is most likely coming from the squishy squeaky stuff underneath the vinyl. We've seen noise like this when multiple issues show up at the same time. It can be a complex concern to diagnose because it usually takes multiple factors to get this to happen. The BIGGEST factor for me would be the UNDERPAD! Start there. It is the weakest link in the chain and it is the EASIEST link to investigate on your own. Your bill from Costco should have the name of the underpad listed. If it does not, contact Costco and have them produce it for your. If the installers used the WRONG underpad, then they are on the hook for the repair. Thankfully you used Costco...they normally have excellent customer service. Sadly, you used Costco...they are not flooring experts which means they don't know how to pick flooring companies. Good luck. Start with the underpad. I think that is your ticket to freedom from this nasty floor. And no, it is not your chair...it is the floor.