Schluter DHERS/BW Installation Guide download pdf (Page 5)

WOOD — Floors, Interior - Ceramic or Porcelain Tile 5

19.2" (488 mm) o.c. joist spacing, single layer OSB

or plywood subﬂoor

DH-W19-T-15

Areas of Application

over any even and structurally sound OSB or

plywood subﬂoor with 19.2" (488 mm) o.c.

joist spacing

interior dry or wet areas

Limitations

minimum 2" x 2" (50 mm x 50 mm) tile

for natural stone, see detail DH-W-S (page 6)

and natural stone discussion (page 23)

Requirements

maximum spacing of joists, I-joists, or ﬂoor

trusses is 19.2" (488 mm) o.c.

minimum subﬂoor thickness – 23/32",

3/4" nom. (19 mm) tongue-and-groove with

1/8" (3 mm) gap between sheets.

Substrate Preparation

verify that subﬂoor panels are properly

fastened to framing members.

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

tightly butted and/or tented plywood or OSB

seams must be addressed prior to installing

DITRA-HEAT.

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.

DH-W24-T-15

24" (610 mm) o.c. joist spacing, double layer OSB

or plywood subﬂoor

Areas of Application

over any even and structurally sound double

layer OSB or plywood ﬂoor

interior dry or wet areas

Limitations

minimum 2" x 2" (50 mm x 50 mm) tile

Requirements

maximum spacing of joists, I-joists, or ﬂoor

trusses is 24" (610 mm) o.c.

double layer wood ﬂoor consisting of:

• minimum subﬂoor thickness – 23/32",

3/4" nom. (19 mm) tongue-and-groove

• minimum underlayment thickness –

11/32", 3/8" nom. (10 mm)

Substrate preparation

verify that subﬂoor panels are properly

fastened to framing members.

underlayment – minimum 11/32", 3/8" nom.

(10 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

tightly butted and/or tented plywood or OSB

seams must be addressed prior to installing

DITRA-HEAT.

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.

Ceramic or porcelain tile

Unmodiﬁed thin-set mortar

DITRA-HEAT

uncoupling membrane

and heating cables

Latex p.c. mortar

Double layer of plywood

or OSB

I-joists or

trusses

Ceramic or porcelain tile

Unmodiﬁed thin-set mortar

DITRA-HEAT

uncoupling membrane

and heating cables

Latex p.c. mortar

Single layer of plywood

or OSB

Joists, I-joists, or

trusses

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Schluter DHERS/BW Installation Guide Page 5

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