Schluter DHERS/BW Installation Guide download pdf (Page 11)

MOVEMENT JOINTS 11

Every substrate presents unique challenges

MOVEMENT JOINTS

DISCUSSION

Movement joints are an integral part of any tile assembly. The various components of

a tile

assembly (tile, mortar, substrate, etc.) have unique physical characteristics that affect

their behavior. Speciﬁcally, these components will expand and contract at different

rates, according to each component’s intrinsic physical properties, with changes

in moisture, temperature, and loading (both dead and live loads). This differential

expansion/contraction of attached components results in internal stresses.

Furthermore, structures that restrain overall expansion of the tile ﬁeld (walls, columns,

etc.) cause stress buildup within the system. If the aforementioned movements

are not accommodated through the use of movement joints in the tile ﬁeld and at

restraining structures, the resulting stresses can cause cracking of the grout and tile

and delamination of the tile from the substrate. Thus, movement joints are an essential

component of any durable tile assembly.

SOLUTIONS

Movement joints must be incorporated within the tile ﬁeld, at doorsills, and at transitions

to walls and other restraining structures to allow movement of the assembly and prevent

stresses that can damage the system. Schluter

-Systems’ prefabricated movement joint

proﬁles protect tile edges and prevent sound bridges and surface water penetration,

resulting in a permanent, maintenance-free installation. The family of Schluter

-DILEX

prefabricated movement proﬁles includes a variety of shapes, sizes, and materials to suit

different applications. Please see Schluter

-Systems’ Illustrated Price List and visit www.

schluter.com for more detailed information on DILEX movement proﬁles.

TECHNICAL NOTES

The Tile Council of North America (TCNA) and the Terrazzo, Tile, and Marble

Association of Canada (TTMAC) provide guidelines (EJ171 and 301MJ, respectively)

for the placement and construction of movement joints in and around the tile ﬁeld.

Schluter

-Systems accepts these guidelines. However, given the increased use of larger

tiles, smaller grout joints, and lighter building materials, which are more susceptible to

movement, Schluter

-Systems recommends that movement joints within the tile ﬁeld be

placed at more frequent intervals, as indicated below.

Guidelines for the placement of movement joints

Applications without heating cables: 16' - 20' (4.9 m - 6.1 m) in each direction

Applications with heating cables or exposed to direct sunlight or moisture:

12' - 16' (3.7 m - 4.9 m) in each direction

Place around the perimeter of any size ﬂoor and/or against all restraining surfaces

Fields should be as square as possible. The ratio between length and width should

not exceed 1:1.5.

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Schluter DHERS/BW Installation Guide Page 11

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