Installation Guide

WOOD — Floors, Interior 7
Floors, Interior - Existing Vinyl Floors
D-V-T-17
Tile or wood base
Ceramic, porcelain or stone tile
RONDEC
DILEX-EKE
Unmodified thin-set mortar
KERDI-BAND
DITRA or DITRA-XL
uncoupling membrane
Fast-setting
latex p.c. mortar
Existing vinyl
Plywood or OSB
Joists, I-joists, or
trusses
Areas of Application
over any even and structurally sound
substrate with existing vinyl flooring
interior dry or wet areas
Limitations
minimum 2" x 2" (50 mm x 50 mm) tile
cushioned vinyl unacceptable
perimeter bonded vinyl flooring unacceptable
multiple layers of vinyl unacceptable
Requirements
for wood substrates, subfloor/underlayment
configuration according to detail D-W16-T,
D-W19-T, D-W24-T, D-W24-XL-T, or D-W-S;
D-W24-XL-T for use with DITRA-XL only
Substrate Preparation
ensure that the structure beneath the vinyl is
sound and adequate
ensure that vinyl is well adhered
remove any wax and clean vinyl
for wood substrates, nail off floor with ring
shank flooring nails every 4" (102 mm) o.c.
– fasteners must pass through entire thick-
ness of assembly with minimal penetration
into joists
any leveling of the assembly must be done
prior to installing DITRA and DITRA-XL
Movement Joints
DITRA and DITRA-XL do not eliminate the
need for movement joints, including perimeter
joints, within the tiled surface. Movement
joints must be installed in accordance with
industry standards and norms; see page 17
of this Handbook, TCNA EJ171, and TTMAC
301 MJ
Setting and Grouting Materials
fast-setting latex portland cement (p.c.)
mortar – ANSI A118.4 or ANSI A118.11
unmodified thin-set mortar – ANSI A118.1
grout – ANSI A118.3, A118.6, A118.7,
A118.8
Setting and Grouting Specifications
tile – ANSI A108.5
grout – ANSI A108.6, A108.9, A108.10
Other Considerations
DITRA and DITRA-XL are adhered to the vinyl
flooring using a fast-setting latex-portland
cement mortar suitable for bonding to vinyl.
As an alternative, a suitable cement-based
embossing leveler or an appropriate latex-
modified thin-set mortar can be used to skim
coat the vinyl to provide a bonding surface.
When skim coat is cured, DITRA and DITRA-
XL are adhered to the skim coat using an
unmodified thin-set mortar. See page 23 for
discussion on latex-modified thin-set mortars
sandwiched between two impervious layers
seaming DITRA and DITRA-XL, including
floor/wall connections, with Schluter
®
-
KERDI-BAND may be appropriate in cases
where a break in the water line of an ice
maker or dishwasher can damage pre-
existing moisture-sensitive substrates and
underlayments. KERDI-BAND floor/wall
connections are just as easily concealed with
wood base as with tile. KERDI-BAND floor/
wall connections in dishwasher alcoves are
parged with thin-set mortar; see page 12
vapor barrier on crawl space floors according
to regional building codes
certain moisture-sensitive stones, e.g., green
marble, or resin-backed tiles may require special
setting materials. Consult stone supplier and
Schluter
®
-Systems for more information
D-SP-TS-17
Ceramic, porcelain or stone tile
Unmodified thin-set mortar
DITRA or DITRA-XL
uncoupling membrane
Latex p.c. mortar
Plywood or OSB
underlayment
Structural plank
subfloor
Joists
Floors, Interior - Structural Plank Subfloor
Areas of Application
over structural plank subfloors
interior dry or wet areas
Limitations
minimum 2" x 2" (50 mm x 50 mm) tile
Requirements
maximum spacing of joists is 24" (610 mm) o.c.
double layer wood floor consisting of:
• minimum structural plank subfloor
thickness – 3/4" (19 mm)
• minimum underlayment thickness –
15/32", 1/2" nom. (13 mm)
Substrate Preparation
verify that subfloor planks are properly
fastened to framing members
underlayment – minimum 15/32", 1/2" nom.
(13 mm)-thick Exposure 1, plugged-face
plywood or OSB with 1/8" (3 mm) gap
between sheets; see page 20 for
underlayment installation guidelines
any leveling of the assembly must be done
prior to installing DITRA and DITRA-XL
Movement Joints
DITRA and DITRA-XL do not eliminate the
need for movement joints, including perimeter
joints, within the tiled surface. Movement
joints must be installed in accordance with
industry standards and norms; see page 17
of this Handbook, TCNA EJ171, and TTMAC
301 MJ
Setting and Grouting Materials
latex portland cement (p.c.) mortar – ANSI
A118.11
unmodified thin-set mortar – ANSI A118.1
grout – ANSI A118.3, A118.6, A118.7,
A118.8
Setting and Grouting Specifications
tile – ANSI A108.5
grout – ANSI A108.6, A108.9, A108.10
Other Considerations
vapor barrier on crawl space floors according
to regional building codes
where a waterproof floor is required, all
DITRA and DITRA-XL seams and floor/wall
transitions must be sealed with Schluter
®
-
KERDI-BAND using unmodified thin-set
mortar; see page 12
certain moisture-sensitive stones, e.g., green
marble, or resin-backed tiles may require
special setting materials. Consult stone
supplier and Schluter
®
-Systems for more
information
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