First off, Linoleum in itself is not toxic, it is a natural and recycled material, however those materials that are placed under Linoleum can be toxic so if you are doing a project, these are the materials to watch out foor.
There are many types of underlayment such as cork, rubber, and recycled. Some have vapor barriers built into them such as the EcoTimber recycled underlayment but cork and rubber do not. Almost every flooring manufacturer requires a vapor barrier to protect against moisture coming up from the subfloor. Therefore, a 6 mil polyethylene sheeting is required to be placed beneath the underlayment.
Our Moisture Block vapor barrier is a recycled plastic sheeting that is ideal for this purpose. All of our underlayments and vapor barriers are non-toxic and are listed along with each flooring product. Please read the installation instructions of each product for further details of what type of underlayment is required.
How to Begin Site Prep Work For Linoleum?
That depends upon the nature and age of the subfloor. Always consult with your installer first. If adjacent floorboards are at different heights, sanding may be required. If they have serious flaws, a self-leveling cementitious product or a premade 1/8"-1/2" hardboard or cement board may suffice. If the concrete slab is cracked, a filler needs to be used in conjunction with an isolation membrane. If the floor is damp it needs to dried thoroughly. If mildew or mold exists they need to be removed. If the floor is squeeky or weak, structural work may be required or hardboard or cement board may suffice.
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