Here are two different bathrooms I did in the same home with marmoleum. The first two pictures show the process with floor prep. In the first picture the subfloor is floated with webcrete. This is called a "skim coat", and is done to fill in the seams, nail/screw/staple holes. After is dries, about 25 minuets, the marmoleum can be installed over the top. Both of these bathrooms had the marmoleum installed right up to the hardwood/door transitions.