Manual and Installation Guide

Compatible Underlayments

Any type of underlayment/padding may be used as long as it has a density of

6-8 pounds per cubic foot.

Certain underlayment, such as ¼” (6mm) thick cork, or 5mm CeraZorb are

recommended for Environ™ Flex Rolls. It is also acceptable to place a vapor

barrier, such as a plastic sheet, under the underlayment. Underlayment papers

are not compatible with Environ™ Flex Rolls.

Underlayment is necessary to prevent Environ™ Flex Rolls from damage

from the weight of the oor, furniture, and people. Unavoidable wooden oor

movements will not harm Environ™ Flex Rolls. Wooden oors expand and

contract with temperature and moisture change. The wooden oor “moves” on

top of Environ™ Flex Rolls. This movement will not damage Environ™ Flex

Rolls when the installation is done correctly and the underside of the nal oor

covering is installed evenly.

Some underlayment materials also have a noise reducing and insulating

effect. When installing over concrete, a ¼” underlayment is mandatory. Any

underlayment available in ¼” size is acceptable in most cases. CeraZorb,

cork, or ¼” to 3/8” of expanded polystyrene (EPS) with a density of 2 pounds

per cubic foot or more, are recommended for installation under Environ™ Flex

Rolls. When installing over a concrete slab, choose the underlayment with the

highest R-Value.

Compatible Wood Laminates

Verify that your laminate is warranted for use with radiant heat. Most modern

wood laminate oors are compatible with Environ™ Flex Rolls, but the

maximum thickness of the timber / laminate / wooden ooring should not

exceed 5/8” (15mm). Flooring that has metallic strips as part of its locking

system is NOT compatible, as these metallic strips may damage the Environ™

Flex Rolls. Also laminates that have their pad already attached to the laminate

are not compatible with the Environ™ Flex Rolls.

R-Value of Floor Covering:

The type and thickness of the oor covering materials used with this product

must not exceed a thermal insulation “R” value of 1.

Example R-values: LAMINATE FLOORING = R 0.675

WOOD FLOORING = R 0.80 maximum

Underlayment/Padding

Wood Subfloor

GROUT

CERAMIC TILE

CERAZORB

POLYMER-MODIFIED

THIN SET MORTER

IMPACTA T-700

BOND COAT ADHESIVE

OR LATEX MODIFIED THIN SET

5/8” (15mm)