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Good maintenance of your windows can help to retain their shape
and strength for many years. When the timber surface is to be
cleaned, it is a good idea also to have a look for any small cracks
and crevices in the paint surface. Especially the windows on the
south and west-facing facades as these are the most exposed to the
sun and weather. If the protective surface has cracks or fissures
through to the wood, Rationel Windows recommends that you repair
the damage immediately.
Generally, when the weather begins to discolour the paint on
your windows and doors, it is time for maintenance.
We recommend that you consult the Rationel Operations and
Maintenance manual. click here to download. If your windows are
painted with a translucent colour, you will find instructions here.
If you have bought ALDUS or PATUS + (timber/aluminium) maintenance
is very limited. You can make do with washing them outside a few
times a year, but it is best if it becomes a habit to wash
them when washing your windows.
You will primarily experience knot extraction on the
windows and doors delivered before June 2009 since Rationel Windows
from that date onwards have used only finger-jointed timber on
painted products. That means timber where the knots have been
removed before windows and doors are made out of it.
If the wood is not jointed, you will typically find resin
extraction or yellow extract from knots. Wood is a living material
that works, therefore extraction may occur. The yellow spots can be
corrected as follows:
Take a good cloth soaked with ethanol and wipe lightly on
the extraction. Rinse with clean water.
Resin that is crystallized can be removed with a stiff brush or
away. If the painted surface has been damaged in the process, sand
the area with fine sandpaper and repaint with a soft brush or a
smooth surface roller.
Dew on the outer side of the glass is positive as this
is proof that the window is very energy efficient, and that it
In certain weather types, for example a clear frosty night, when
there is more heat radiation from the earth towards the sky there
may be periods in the early morning hours where the outer surface
of a low-energy pane is colder than the air outside. This results
in condensation on the glass surface. The dew disappears when the
air temperature rises during the day.
If there is condensation on the inner side of the glass, you will
need to ventilate the room. It is a sign of too high relative
humidity inside and should be reduced to prevent rot, moisture
damage and a poor indoor climate.
Dew between the two pieces of glass is a sign that the sealed glass
unit is punctured and should be replaced.
here to read more about creating a healthy indoor climate
If the sticker on the glass stays on too long, there may be glue
residue on the window. Stickers are easily removed with
toothpaste, lamp oil, cleansing cream for ceramic hobs and possibly
a glass scraper.
It is possible to adjust virtually all types of windows and
doors from Rationel.
>> Click here
to download Operations and Maintenance Manual
For the sealing of Rationel
sealing branch recognized principles.
When installing it will in most cases be useful to separate
frame and sash.
>> In the
Operations and Maintenance Manual you can read about
separation of the frame and sash. Download here.
For advice and guidance on joining in multiples here.
If it is necessary to change the glass, it is possible to do it
yourself on DOMUS and ALDUS windows and doors. Please follow
the instructions in the guides below.
How to dismount glass in windows and
How to change glass in fixed frames
How to change glass in opening
How to change glass in windows with timber glazing
In cases with PATUS og PATUS+ is would be better to
buy a new sash and replace the old.
Were you unable to find an answer to your
You are always welcome to contact
Rationel Windows for advice and guidance.