If
there is uncertainty and risk concerning humidity content
or emissions form the bottom slab
or subfloor construction, air gaps under the finished floor
should be ventilated using mechanical
ventilation in combination with the fitting of a moisture
barrier under the floor girders.
In its standard configuration, the height of the Granab system
is adjustable from 30–420 mm
and provides an open airflow under the girders.
The space under the floor constitutes a separate “room
unit” (sealed box) that is ventilated independently,
or in special cases, in combination with other ventilation.
System 3000 with moisture barrier above the girders
System 7000 with moisture barrier above the girders
A large number of single-family
dwellings and other
buildings are subjected to moisture damage each year
in basements, or elevated moisture content in basement
slabs.
Besides performing checks and taking possible measures
involving new drainage and filling materials around the
structure, the wooden joists or plastic floor covering installed
or placed directly on the basement floor must be
removed, followed by drying of the concrete floor.
Do not build in moisture!
Moisture from concrete floors in basements or bottom
slabs must be removed through ventilation and not built
into the floor construction. A Granab system with floor
girders of galvanised steel and no organic materials is
adjusted up from the concrete floor to the desired height
and air in the space between the subfloor and surface
flooring is constantly extracted using ventilation.
Granab systems with sound-dampening elements provide
comfortable floors with good acoustic properties.
Avoid moisture, mould and stale
indoor air – install a Granab system with underfloor
ventilation.
Order our ventilation
pamphlet for more information.
Här kan du bläddra i vår Ventilationsbroschyr
(klicka på katalogen för större katalog)
Granab ventilated subfloor principle
Separate mechanical ventilation in “room
unit” under the floor using an exhaust fan
that draws air out via perforated air ducts
of, for example, standard spiral ducting.
Inlet air to the ducts is obtained via a
filter-equipped air terminal device that
takes inlet air from the respective room
units.
Additional inlet air can be obtained with,
for example, an additional outdoor air
valve.
If
there is uncertainty and risk concerning humidity content
or emissions form the bottom slab
