Originally Posted By: Jay Moge
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i asked our sub. contracted flooring guys and did some of my own reserch and found that what most people don’t uderstand is that “lenoleum” today is actualy vynal. and that layer is very very thin. it’s bonded to a material with a special glue, the 2 products together is what adds up to the 1/8th inch of material we see. when it get wet and dries the vynal seperates from the base material and the byproduct of the wet glue and base material turns either a gray, or blue-ish color. alot like a water stain, but the base material is sometimes recycled paper and has some remains of inks that were the original paper use. actual lenoleum will handle water much better, but more likely to crack when it dries. hope that help. in any case if you see that discoloring you can bet that the floor has been wet or flooded at one point.