Installation Instructions

For DuraCeramic Dimensions always install UnderFlor with seams
running perpendicular to the long dimension of the tile flooring
(Fig. 5). Install tiles with staggered end joints positioned at least
4" away from the seams in the Congoleum UnderFlor.
Unroll the rst sheet and trim it to t allowing a 1/4" space between
the edge of the sheet and the wall.
Unroll the second sheet and position it with the seam edge butted
lightly up to the rst sheet. If necessary, to adjust the seam location
to ensure proper placement, overlap the sheets and double-cut a
new seam in the desired location. Use a straightedge and utility knife
to cut the seam.
Tape the sheets together with 2" wide clear packaging tape or other
thin single face plastic tape available through office supply stores and
most home centers. Apply the tape, centered directly over the top of
the seam edges. Roll the tape with a steel seam roller.
Suitable Packaging Tapes Include:
• Scotch
®
3850 Packing Tape
• Duck
™
Tape Standard Packaging Tape
• Shurtape
®
HP Series
Do not use masking tape, fiber reinforced tape, duct tape or other
thick tapes that might telegraph through the finished flooring.
Install nished ooring immediately after installing Congoleum
UnderFlor.
Installing DuraCeramic, DuraCeramic Dimensions
and Ovations over Congoleum UnderFlor
Follow installation instructions for the finished flooring being installed.
Install nished ooring with Congoleum DS100 DuraSet Adhesive
using the recommended trowel notch size. Do not apply excess
adhesive. Allow adhesive to dry completely to a tack prior to flooring
installation. Slight growth (buckles) in the UnderFlor may occur
immediately after adhesive application. This is normal and will not
affect the nished ooring installation. Install nished ooring allowing
a 1/8" to 1/4" space around the entire perimeter. If necessary to
adjust or remove a tile, use a heat gun to warm it up rst. Roll nished
flooring on completion of the installation.
All finish trim and transition moldings must be installed so they do
not bind or restrict the finished flooring from moving when expansion
and contraction occurs during seasonal changes. Fasten the trim to
the wall not to the subfloor.
Do not drive fasteners into the floor or underlayment.
Seal all areas that may be exposed to surface spills, i.e. tubs, toilet
and showers with a silicone caulking.
DURACERAMIC INSTALLATION
Tile Layout
• Layout is slightly different for grouted and ungrouted oors. The grout line
width must be added to the tile dimension for layout on grouted floors.
Additional chalk lines are also used to keep the joints straight. DuraCeramic
nominal tile size is 15 5/8" x 15 5/8". DuraCeramic Dimensions nominal tile
size is 12" x 24". Ovations nominal tile size is 14" x 14".
• It is important to avoid positioning the tile joints directly over underlayment
joints or seams in UnderFlor or existing ooring. If this should occur, reposi-
tion chalk lines to offset joints by at least 3" or half of the tile dimension.
Fig. 5 – Install UnderFlor with seams
perpendicular to the long dimension of the
DuraCeramic Dimensions flooring.
7
Suboor
Construction/ Comments Notes
Materials
• Double layer construction over
joist or trusses on 16" centers.
• Single layer oors constructed
with APA Rated Sturd-I-Floor
T&G Panels, minimum 23/32"
over joists or trusses on
19.2" centers.
Underlayment • APA underlayment grade
plywood.
• Oriented Strand Board (OSB)
• NPA rated Particleboard
Concrete • On, above and below
grade level.
• Radiant-heated oors not
to exceed 85°F (29°C).
• Minimum 100-pound
dry density
• Minimum 3,000 psi
compression rating is required.
• Smooth, or textured sheet
flooring
• Vinyl composition tile
• Do not install over soft, heavy
cushioned floors, flooring
with a cushioned backing
or tile installed below
grade below.
• Ceramic, marble and granite.
• Adhesive Residue - Scrape to
remove heavy spots and cover
with a 4 mil sheet of poly lm.
• Paint - Remove loose paint.
Congoleum UnderFlor
Substrate Recommendations
UnderFlor can be installed over the following surfaces:
Subfloor must be
smooth solid and
free of movement
with at least 18" of
well ventilated air
space below.
Weather damaged
or rough surface
materials must be
sanded smooth.
Gaps wider than
1/8" should be
filled level.
Moisture vapor
emissions not to
exceed 5 lbs. or
80% RH. Fill depres-
sions and cracks
wider than 1/8".
Fill depressions
and cracks wider
than 1/8".
Resilient
Floor
Must be single
layer, fully adhered
and well bonded.
Fill grout joints
and level floor.
Ceramic
and Stone
Old Adhesive
and Residue
and Paint
Follow recom-
mended work
practices for
adhesive and
paint removal.
Gypsum
Topping and
Light Weight
Concrete
Wood
Structure
May 2015