Things to consider before you buy
New windows and doors will create a better internal atmosphere.
However, there are a few conditions you should be aware of so that
you can get the most out of what is likely to be a significant
Measure the windows and doors correctly
Consider the tolerances before you calculate the measurements of
the window frame. We recommend that you leave 10-12 mm for
tolerances around the window and they should be taken from the
If you are going to replace windows in an older property do not
just take the measurements of one window even though all the other
windows may appear identical. This is not always the case. To be
certain take measurements for all the windows.
Questions to ask before you install Rationel windows
Is the window able to open without the roof being in the
Is there adequate space for the fresh air vent in the side
frame? Is it covered by a lighting panel, tiles or something
How would the new window fit in relation to, for example, the
height of a kitchen work top?
Does the bottom section of the new door fit with the floor
height inside and outside?
2. Think of both appearance and your view
Be careful that your view is not obstructed when looking out try
to avoid placing bars and posts at eye level.
3. Large glass panels and the sun
Large areas of glass will let in a lot of daylight. High levels
of daylight will brighten your mood and will reduce your heating
In the summer you will be exposed if you have a typical urban
house without eaves. In this case the house will be totally exposed
to the sun making it feel very hot inside.
You should refer to the glass section on this website and decide
your own requirements for specialist glass, in this case solar
glass would be necessary. Otherwise it might be worth considering
placing the larger glass facades toward the north or east.
Once Rationel windows are installed in your home
1. Let in some fresh air!
New windows are sealed.
It is up to you how and when you air your house. It is a myth
that it is expensive and energy inefficient to keep a house
ventilated. You just need to make sure you do it the right way.
Open a window or a door all the way to ideally allow a draft. By
doing this you will exchange the warm moist air inside with the
cold and dry air outside in less than 10 minutes. In such a short
time there will be no cooling of the room's larger items such as
furniture, walls and floors etc. and the loss of energy will be so
small that it will be hardly noticeable.
2. Wash the whole window - not just the surface
We recommend you open the windows a couple of times a year to
wash and clear all window frames. Only use water with a small
amount of cleaning agent. It is particularly important to remove
spider webs and any debris that inevitably gathers in corners that
obstruct the automatic drainage and necessary ventilation paths.
Blockages can cause dampness and rot the wood.
It is this maintenance that can extend the life of your windows
3. All windows and doors require maintenance
To ensure the longevity of your windows and doors maintenance is
If you have chosen ALDUS wood/aluminium windows you only need to
wash the windows and frames a couple of times a year or when you
are cleaning the windows. In order to keep the aluminium frame
shiny, we suggest that you polish it with wax such as car polish,
say once a year. If you give the movable hinge parts a drop of oil
once in a while you will have windows that look new and function
for many years.
If you have chosen DOMUS wood windows they should be looked
after as ALDUS but the windows will eventually require repainting
Keep an eye out for gaps in the outside surface treatment on a
regular basis, especially at the south and west-facing facades. In
these areas the sun's UV-rays are hardest on the timber and once
you have gaps in the paint dampness will start to set in and the
deterioration of the wood will have begun.
It's a good idea to inspect the windows once a year and make
good the surface with a brush and paint where needed. The wood
humidity should be between 15 and 18 percent and the air
temperature should be approximately 15 degrees when you do the
work. Avoid painting in damp conditions.