1) Subfloor: concrete or wood?
Subfloors are usually made of concrete or wood (plywood, OSB, chipboard). Proper installation requires that the subfloor be clean, dry, flat, smooth and free of dips and bumps. Cracks and sloping subfloors need to be filled and leveled; this can be costly, as it usually requires professional installation. A plywood underlayment may also be needed on top of the subfloor.
Note: Marmoleum sheet and tile cannot be glued directly to underlayment or subfloors made of luan, particleboard or chipboard because these materials expand and contract too much and are not stable.
Marmoleum Click panels and squares are the only type that can tolerate slight unevenness in the subfloor, up to 3/16" over an 8' span. Larger variations in your subfloor will cause too much stress on the click mechanism and eventually wear it out. Click panels and squares can even be applied over most vinyl or ceramic tile. If you have asbestos tile, before installation please consult with professionals who provide asbestos abatement.
2) Installation: new construction or remodel?
In older homes, click panels and squares are preferred because they're easier and faster to install than sheet or tile, and they require much less floor preparation. If you install the flooring directly over another floor such as vinyl, ceramic or hardwood, you can save time and money because there's no tear out required. This is possible with Marmoleum click because it requires no glue or nails, and it floats over the existing flooring or subflooring.
Proper vapor barriers are required such as Moisture Block; however, old sheet vinyl can act as a vapor barrier.
From: https://www.greenbuildingsupply.com/Learning-Center/Flooring-Marmoleum-LC/Marmoleum-Buyers-Guide
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