
Installin Cuttin Surface - Layer 3
10) Cut Wonderboard Material:
Cut 16 pieces of 11 7/8 x 36” for yield of
five pieces per oard using 3 x 5’ sheet.
Note: If a smaller water drainage gap e-
tween the Wonder oard is desired cut 20
pieces and place a 2 3/4’” gap etween
oards and the edge oards flush to the out-
side of the ta le.
2 3/4” 11 7/8” 5”
11) Layout:
For layout depicted, mark the ta le with a chalk line or rip spacer plywood oards to set the gap with
when onding.
12) Prepare the Table for bondin :
Important Step: Wet the ta le top down with a sponge. This step will allow the thin-set to cure
slowly for a strong ond. Bonding to the dry HardiBacker® surface will result in flash dry and a very
weak ond. Allow any surface water to dry efore onding with mortar mix.
13) Bond the WonderBoard Strips:
Mix tile mortar (thin-set) in a five gallon ucket using an acrylic additive. We recommend Kera ond®
Tile Mortar and Keralastic® acrylic additive made y Mapei® availa le from most Tile supply stores.
Tip: The thin-set should e on the thin side ut still a le to hold its shape when toweled with a 1/4”
notch trowel. If the temperature is hot, dampen the ta le periodically efore gluing each strip to pre-
vent the thin set from firing off and loosing onding strength.
If outside, do this operation in the morning to prevent any sun from heating the ta le while working
the thin set.
Set four 3’ piece at a time, taping down each piece with a ru er mallet to ensure good ond. Place the
first piece flush with the ottom of the ta le opposite the water pan, this will overlap the center
seam, the other end will hang over the top of the ta le y 1” and should e trimmed once the thin-
set has cured.
After two 6’ strips have been set, check with a strai ht ed e and hit down on the high spots with a ru -
er mallet. Place weight on the ends and middle of the Wonder oard and set two more strips.
Once four 6’ strips are set re-check with a strai ht ed e in both directions and diagonally. Adjust as
needed. Be carful not to over work the thin set or the ond will weaken.
Once the entire top is set, place a moderate amount of wei ht on all hi h points alon with ends and
middles, allow it to cure for at least 8 hours efore removing the weight .