Schluter DHERS/BW Installation Guide download pdf (Page 7)

WOOD — Floors, Interior 7

Floors, Interior - Existing Vinyl Floors

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 DH-W16-T,

DH-W19-T, DH-W24-T, or DH-W-S

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

thickness of assembly with minimal

penetration into joists

any leveling of the subﬂoor must be done

prior to installing DITRA-HEAT.

Movement Joints

DITRA-HEAT does 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 11 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 A118.15

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-HEAT is 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-HEAT is

adhered to the skim coat using an unmodiﬁed

thin-set mortar. See page 21 for discussion

on latex-modified thin-set mortars

sandwiched between two impervious layers.

seaming DITRA-HEAT, including ﬂoor/wall

connections, with 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 10.

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.

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 14 for

underlayment installation guidelines.

any leveling of the subﬂoor must be done

prior to installing DITRA-HEAT.

Movement Joints

DITRA-HEAT does 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 11 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-HEAT seams and ﬂoor/wall transitions

must be sealed with KERDI-BAND using

unmodiﬁed thin-set mortar; see page 10.

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.

DH-SP-TS-15

DH-V-T-15

Tile or wood base

Ceramic or stone tile

RONDEC

DILEX-EKE

Unmodiﬁed thin-set mortar

KERDI-BAND

DITRA-HEAT

uncoupling membrane

and heating cables

Fast-setting

latex p.c. mortar

Existing vinyl

Plywood or OSB

Joists, I-joists, or

trusses

Ceramic or stone tile

Unmodiﬁed thin-set mortar

DITRA-HEAT

uncoupling membrane

and heating cables

Latex p.c. mortar

Plywood or OSB

underlayment

Structural plank

subﬂoor

Joists

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Schluter DHERS/BW Installation Guide Page 7

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