The self leveler would be my first choice as it appears to be the most fail safe approach but if the embossing leveler is the way to go i would proceed with the utmost care.
Embossing leveler for vinyl flooring.
Roberts 1800 946ml vinyl sheetgoods embossing leveler is a low voc environmentally friendly ready to use product that quickly repairs and prepares existing floor for the installation of a new floor layer.
Linoleum or vinyl flooring.
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The aim of an embossing leveler is to reduce any effects which are the results of seams depressions and the quality of the existing floor when you install the new floor on top of it.
Leveling mixes are designed to make smooth surfaces and are most often used on concrete or wood.
Emboss leveling saves time and provides a smooth stable surface for the new floor covering when applied properly.
This underlayment sets in 2 hours and can be used on concrete wood and metal flooring as a feather edge deep fill or embossing leveler.
Emboss leveling of floors sometimes referred to as emboss flooring prepares a linoleum or tile floor to be covered by a new floor covering without removing the old floor covering.
For patching and repairing indoor surfaces prior to flooring installation.
If it s vinyl that is a moisture barrier and chances are that s what s down there unless you think the floor is original 1959.
An embossing leveler will work as an underlayment when you install new flooring to a room.
Fills and levels the embossed surface of existing resilient flooring prior to the installation of new floor covering.
Applied with a straightedge trowel the embosser will create a smooth surface to support the new floor.
It can be purchased as a powder or as an easy to use compound that is about the consistency of mortar.
I also understand some products are not recommended for floors containing asbestos which i don t understand so that can t be a restriction.
If the old floor has a rough texture or some indentations use a coat of embossing leveler.
Sheet vinyl can be laid over old linoleum or vinyl flooring if the existing floor is in good condition.
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If it s not the original floor chances are it s vinyl not linoleum.
Either way i d want some underlayment underneath for sound and insulation and most of those are also moisture barriers that i ve seen.