39
For W0-I as well as W1-I, moisture-sensitive building materials
such as gypsum and gypsum lime plasters, gypsum dry mortar,
gypsum wallboards, gypsum fiberboards, gypsum boards, wood
and wood-based materials as well as calcium sulfate screeds can
also be used.
For W2-I and W3-I, only moisture-insensitive building materials
such as concrete, lime-cement plaster, cement-bound mineral
building boards, cement screed or aerated concrete may be used.
According to the new water impact classes, bathroom floors are always
classified at least as class W1-l, but depending on the design, they may
also be partially or completely classified as class W2-l (see graphic on
opposite page).
DIN 18534 „ABDICHTUNG VON INNENRÄUMEN“
IN ADDITION, THE MATERIALS FOR THE SUBFLOORS ARE
REGULATED DEPENDING ON THE WATER EXPOSURE CLASS:
SUBFLOOR PROPERTIES FOR COMPOSITE WATERPROOFING, DEPENDING ON THE WATER
EXPOSURE CLASS ACCORDING TO DIN 18534
W2-I and W3-I moisture-
insensitive subfloors
Gypsum and gypsum cold
plasters from gypsum dry
mortar
gypsum wallboards
Calcium sulfate bound
screeds
Gypsum fiberboards
Gypsum boards
Gypsum boards with fleece
reinforcement
Concrete
lime-cement plaster of mor-
tar group CS II/III
cement-bound mineral
building boards
corrosion-protected metallic
materials
Composite elements made
of expanded or extruded pol-
ysterol with mortar coating
and fabric reinforcement
lightweight concrete hollow
wall panels
Cement plaster of mortar
group CS IV
cement screed
aerated concrete
W0-I and W1-I moisture
sensitive subfloors
WATER EXPOSURE CLASS
EXAMPLES FOR SUBFLOORS
CAUTION: To protect surrounding areas, provide surge edg-
es or suff icient counter-slope with at least 10 mm diff erence
in level to prevent water transfer to surrounding unsealed
areas.