Installation Instructions

www.prosourcecenter.com
Rev 5/30/2019
18. Whether you have installed the optional foam curb or have built one out of 2x4 lumber covered with wall
board or concrete, the curb will also get covered with waterproof membrane. Apply notched modified thin-
set mortar to all curb surfaces, then apply WP membrane using the position, seat and press techniques
used throughout the installation. For curb runs longer than the length of the membrane, add additional
pieces while observing the 2 inch overlap rule. Using the same techniques used to install inside corners,
install an outside corner where the curb meets the wall.
19. Thread riser (with construction plug installed)
into riser locking ring (flat black ring with
threaded center.) Drop the entire assembly down
into the flange’s center pocket. Test fit the tile
that you will be installing on the floor next to the
riser assembly. Make final adjustments to the
height of the riser by threading up or down as
needed until the construction cover is about flush
with your dry-fitted tile.
20. With a margin trowel or small flat blade, push high-quality modified thin-set
mortar into pocket and into the locking grooves of the riser locking ring. This
process will allow final adjustments while allowing a super solid, strong and
well-supported riser and grate assembly after the thin-set has cured.
21. Make final adjustments to the position of your riser assembly adjacent to a
piece of dry-fit tile that will be installed on your floor. Turn the riser left or right
as needed for proper orientation to how your tile will be installed while still
observing an even height between the two. You may move the assembly hori-
zontally at this time if needed or even make a tilt adjustment if necessary.
Once you have the correct position, use your tile test piece to check all four
sides of the riser. Make further adjustments if necessary. Do not disturb the
riser assembly while allowing to dry and cure.
22. If you able to install tile without disturbing the floor or riser assembly, you may start right away. Be sure to
use the notch-size of trowel your tile’s manufacturer recommends - usually at least 1/4”. If time permits, it
is better to allow at least the floor components to cure to hardness before beginning tile installation. Be-
cause you are installing tile on a nearly vapor-impervious membrane layer, you will need to allow thin-set
to cure to hardness before considering the final grouting phase of your installation.