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