Page 3 - 2018-12-CFR Volume 123 - Indentations in Resilient Hard Surface Flooring - December 2018
P. 3

You must understand that the load limit rating on the
      vinyl flooring is arrived at without any adhesive under
      the flooring or uninstalled.  Adding adhesive, de-
      pending on what type and how thick it is, either pre-
      applied or applied at installation, will add another ele-
      ment to the indentation resistance or lack thereof on
      the flooring.  Typically for rolling or static loads in a
      hospital an adhesive, such as an epoxy, will be more
      resistant to indentation than an applied or pre-
      applied adhesive.  Furthermore, rolling the adhesive
      on instead of troweling it will often make a difference
      in seeing, or not, obvious indentations in the flooring.

       FRONT SIDE—
                                    BACK SIDE—
                                    IN ADHESIVE

      Another consideration is the type and density of the
      patch or leveling agent beneath the flooring.  If the
      compressive load of the leveling agent or patch is
      not high enough then it will indent and show through
      the flooring surface.  Add to this any moisture vapor
      emission in the substrate that can hydrate the patch
      compromising it’s integrity, causing it to break down,
      or additives in the concrete that can affect the integri-
      ty of the patch also causing it to break down or
      debond and you have a host of conditions that can
      add to vinyl flooring not being able to resist indenta-

      Now let’s take into account the finish on the flooring,
      especially in a hospital where the gloss levels most
      often desired by them is like glass and any indenta-
      tion and the visibility of it, is magnified.  Add to that
      overhead lighting or sunlight streaming into the
      space and any indentation is going to be visible and

      ASTM tests for static load (ASTM F970) which
      should not have a residual compression greater than
      0.005 inches and rolling load (ASTM F2753) which
      no compression is given for, is a consensus number.
      We know that a compression of 0.002 inch is visible.
      Given the compression for static load we can
      3                                            Commercial Flooring Report                            December 2018
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