Installation Guide

©2019 RI
REV 11.14.2019
5
Readings between the wood subfloor and underlayment should
be within 3% and have a maximum moisture content of 14%
or less.
MOISTURE SUPPRESSANT SYSTEM
Concrete subfloors that exceed adhesive specifications will require a
Moisture Suppressant System. Due to complexities associated with moisture
vapor transmission, emissions and movement of soluble salts (alkalinity) in
concrete subfloors, we do not offer, recommend, or warranty a specific
solution for excess moisture in concrete slabs. However, there are many
companies that offer solutions with warranties for excess moisture in
concrete slabs.
RI suggests that you reference the current ASTM F710, “Standard Practice
for Preparing Concrete Floors to Receive Resilient Flooring”.
SUBFLOOR PREPARATION
Careful subfloor preparation is vital for an excellent floor appearance and
good tile/plank adhesion. The subfloor must be smooth, firm, flat, clean, dry,
free from defects, and fit for purpose. A suitable smoothing compound
should be used to ensure that no irregularities show through to the surface
of the finished floor. In all cases, the subfloor must meet the moisture and
pH requirements before installation.
Below and on-grade concrete subfloors must have a suitable vapor retarder
properly installed directly beneath the slab. Always follow manufacturers’
written recommendations for the use and installation of their appropriate
surface preparation materials
1. Record and file site conditions, test results and any corrective action(s)
taken. It is important to maintain this documentation throughout the
warranty period.
2. Subfloor must be clean (free of dirt, sealers, curing, hardening or
parting compounds or any substance that may stain or prevent
adhesion), smooth, flat, sound, fit for purpose, free of movement,
excessive moisture and high alkalinity.
3. Slick surfaces such as power troweled concrete shall be abraded or
profiled to allow for a mechanical bond between the adhesive
and subfloor.