Pre-intallation Rule

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Moisture Testing Subfloor

 General: Test the subfloor for moisture content before installation. If high moisture readings are found,
identify the moisture source and correct the problem. Extend acclimation time and increase ventilation
until the proper conditions have been met. Apply a moisture barrier. Please note that test results are only
applicable the day of testing and will not ensure that moisture will not fluctuate with seasonal changes.
Regardless of subfloor moisture content, the use of a moisture barrier is required for all installations. Cali
Bamboo does not warrant against moisture related problems. If results show moisture vapor at or
exceeding 12%, determine its source and correct problem before installation.

Wood Subfloors:  Wood Subfloors: Use moisture meter to test wood subfloor moisture content. If results
show moisture vapor at or exceeding 12%, determine its source and correct problem. Do not install the
floor without a vapor barrier. Cali Bamboo always recommends using a moisture/vapor barrier, especially
if the moisture content of the flooring and subfloor vary greater than 3%.


Concrete Subfloors:  Concrete subfloors must be tested for moisture vapor pressure in more than one
place for consistent readings. If test results show moisture vapor exceeds the minimum requirements
below, do not install the floor without an impermeable vapor retarder with a perm rating of less than .13
designed to permanently block this moisture.