I will need to learn a lot more about your daughter's situation, before I
can offer some concrete advise. Please have her email the details, as to the
subfloor material, fasteners of the hardwood, and the composition of the
hardwood. Meaning solid wood, laminated and the thickness and width. And do
you mean gapping or actual cracking of the wood itself ?
Generally speaking I NEVER recommend a hardwood floor in a kitchen, and the
contractor should have read your daughter the riot act before installing
such a moisture sensitive floor in a water spill prone area. And ANY
prefinished floor is less than useful in this kitchen due to all those
exposed seams. Whenever I am persuaded to do a kitchen floor in hardwood, it
is always sand on site with 4 coats of oil modified polyurethane, but don't
get me started, have you daughter email me directly.
As always your Most humble servant, Joseph, the Wood Floor Doctor.