Frequently asked questions
Rationel Windows works with a network of distributors and we would refer your details to one of them, depending on your area and the requirements of your project. We would just need window range, specification, dimensions and drawings (elevations and/or window schedule).
The lead time depends on the requirements of your project. As a standard we are working on a lead time of around 8-10 weeks from sign off.
After we refer your details to a distributor, they will contact you within 48 hours. You should have a quotation back in no more than 5 working days.
Rationel windows and doors have been tested and marked according to several national and European standards, including "Secured by Design".
Read more about SDB here
Rationel offers windows and doors for all building styles and shapes. Read more about our different product series here
We have a showroom in our Bicester office. If you wish to see our windows, please do not hesitate to ring the office and book an appointment.
The office is open Monday to Thursday 9am-5pm, Friday 9am-4pm. We also have some distributors around the UK with showrooms. Please call our reception for more details.
Rationel offer a wide range of standard colours depending on the product series.
You can read more about the individual maximum and minimum sizes in the section "opening functions".
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No, unfortunately Rationel Windows are not CWCT certified, which is an Air permeability, watertightness, wind resistance and impact mandatory test for all curtain walling.
The calculated results for a pressure of 1 Pa, Air flow is 8.64 m3/h, resulting an equivalent area of 3052 mm2
The information printed on the spacer bar between the panes of glass has information about pane size, energy values, order and position number.
Example of text in panes spacer:
22-04-2011 83314 2659 / 24 EN 1279 2601013 Optifloat Clear 4mm/TGI RAL7035(18)/Argon/Optitherm S3 4mm 764x530 1254518 / 7 ENERG:A U=1,14 g=0,59 Lt=0,80
22-04-2011 Production date EN 1279 Production standard 2601013 Panes item no. at Rationel Optifloat Clear 4mm/TGI RAL7035 (18)Argon/Optitherm S3 4mm Panes structure 764x530 Size in mm. 1254518 The window/door order no. at Rationel 7 Windows/doors position no. at Rationel ENERGI:A Energy Class U=1,14, g=0,59, Lt=0,80 Energy values (Ug, Gg, LTg)
The amount of information depends on the age of the window. In newer windows you can find the above mentioned information.
If you would like to receive a window chop sample, please email firstname.lastname@example.org
Alternatively, dial 01869 388825 to contact our stores department.
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.
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 scraped
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 functions properly.
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.
It is possible to adjust virtually all types of windows and doors from Rationel.
When installing it will in most cases be useful to separate frame and sash.
Subject to our conditions, Rationel guarantees that the goods supplied will comply in all material respects with their specifications and be free from defects in materials and
workmanship for a period of five years from the time that the risk in them passes from Rationel to the customer.
Furthermore, Rationel's products are covered by a product liability insurance covering damages caused by a Rationel product. The insurance applies if the damage is proved to be caused by a fault caused by Rationel. The insurance does not cover consequential loss, loss of profits or any other indirect loss.